最近通過WPF開發專案，為了對WPF知識點進行總結，所以利用業余時間，開發一個學生資訊管理系統【Student Information Management System】，前三篇文章進行了框架搭建和模塊劃分，后臺WebApi介面撰寫，以及課程管理模塊開發，本文在前三篇基礎之上，繼續深入開發學生資訊管理系統的班級管理和學生管理模塊，通過本篇文章，將繼續鞏固之前的知識點，本文僅供學習分享使用，如有不足之處，還請指正，
涉及知識點
由于班級管理和學生管理的服務端開發，在第二篇文章中以后介紹，所以本篇專注介紹客戶端功能的開發，涉及知識點如下：
- WPF開發中TextBlock，TextBox，DataGrid，Combox等控制元件的基礎使用以及資料系結等操作，
- MAH樣式的使用，在本示例中MAH主要用于統一頁面風格，提高用戶體驗，
- HttpClient使用，主要用于訪問服務端提供的介面，
業務邏輯
首先班級管理和學生管理既有關聯，又相互獨立，不像課程管理模塊獨立存在，不與其他模塊存在依賴，所以兩個模塊一起放在一篇文章進行講解，關系如下：
- 學生屬于某一班級之學生，所以學生中包含班級資訊，
- 班級中存在班長，班長又屬于學生的一個物體，
班級管理
1. 介面訪問類ClassesHttpUtil
班級資料表結構和服務介面，在第二篇文章中已有介紹，如有疑問，可前往參考，介面訪問類用于封裝訪問服務端提供的介面，如下所示：
1 namespace SIMS.Utils.Http 2 { 3 public class ClassesHttpUtil:HttpUtil 4 { 5 /// <summary> 6 /// 通過id查詢學生資訊 7 /// </summary> 8 /// <param name="id"></param> 9 /// <returns></returns> 10 public static ClassesEntity GetClasses(int id) 11 { 12 Dictionary<string, object> data = https://www.cnblogs.com/hsiang/archive/2022/06/01/new Dictionary<string, object>(); 13 data["id"] = id; 14 var str = Get(UrlConfig.CLASSES_GETCLASSES, data); 15 var classes = StrToObject<ClassesEntity>(str); 16 return classes; 17 } 18 19 public static PagedRequest<ClassesEntity> GetClassess(string? dept, string? grade, int pageNum, int pageSize) 20 { 21 Dictionary<string, object> data = https://www.cnblogs.com/hsiang/archive/2022/06/01/new Dictionary<string, object>(); 22 data["dept"] = dept; 23 data["grade"] = grade; 24 data["pageNum"] = pageNum; 25 data["pageSize"] = pageSize; 26 var str = Get(UrlConfig.CLASSES_GETCLASSESS, data); 27 var classess = StrToObject<PagedRequest<ClassesEntity>>(str); 28 return classess; 29 } 30 31 public static bool AddClasses(ClassesEntity classes) { 32 var ret = Post<ClassesEntity>(UrlConfig.CLASSES_ADDCLASSES, classes); 33 return int.Parse(ret)==0; 34 } 35 36 public static bool UpdateClasses(ClassesEntity classes) { 37 var ret = Put<ClassesEntity>(UrlConfig.CLASSES_UPDATECLASSES, classes); 38 return int.Parse(ret) == 0; 39 } 40 41 public static bool DeleteClasses(int Id) 42 { 43 Dictionary<string, string> data = https://www.cnblogs.com/hsiang/archive/2022/06/01/new Dictionary<string, string>(); 44 data["Id"] = Id.ToString(); 45 var ret = Delete(UrlConfig.CLASSES_DELETECLASSES, data); 46 return int.Parse(ret) == 0; 47 } 48 } 49 }
2. 客戶端頁面視圖
班級管理的客戶端頁面視圖共兩個，一個查詢串列頁面，一個新增編輯頁面，共同組成了班級管理的增刪改查，
查詢班級串列頁面，涉及知識點如下所示：
- 查詢條件或者串列中資料列展示，通過資料系結Binding的方式與ViewModel進行互動，即點擊查詢按鈕，不再傳遞引數，因為ViewModel中的屬性已經同步更新，
- ViewModel中并非所有屬性都可實作雙向系結，必須是實作具有通知功能的屬性才可以，在Prism框架中，通過BindableBase的SetProperty方法可以快速實作，
- View視圖中如果控制元件存在Command命令，則可以直接系結，如果不存在，則可以i:Interaction.Triggers將事件轉換為命令，如Load事件等，
- 在串列中，如果需要添加按鈕，可以通過DataTemplate進行資料定制，
查詢班級頁面代碼，如下所示：
1 <UserControl x:Class="SIMS.ClassesModule.Views.Classes" 2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 4 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 5 xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 6 xmlns:local="clr-namespace:SIMS.ClassesModule.Views" 7 xmlns:prism="http://prismlibrary.com/" 8 xmlns:i="http://schemas.microsoft.com/xaml/behaviors" 9 xmlns:mahApps="http://metro.mahapps.com/winfx/xaml/controls" 10 xmlns:ctrls ="clr-namespace:SIMS.Utils.Controls;assembly=SIMS.Utils" 11 prism:ViewModelLocator.AutoWireViewModel="True" 12 mc:Ignorable="d" 13 d:DesignHeight="450" d:DesignWidth="800"> 14 <UserControl.Resources> 15 <ResourceDictionary> 16 <ResourceDictionary.MergedDictionaries> 17 <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" /> 18 <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Themes/Light.Blue.xaml" /> 19 <ResourceDictionary> 20 <Style x:Key="LinkButton" TargetType="Button"> 21 <Setter Property="Background" Value="White"></Setter> 22 <Setter Property="Cursor" Value="Hand"></Setter> 23 <Setter Property="Margin" Value="3"></Setter> 24 <Setter Property="MinWidth" Value="80"></Setter> 25 <Setter Property="MinHeight" Value="25"></Setter> 26 <Setter Property="BorderThickness" Value="0 0 0 0"></Setter> 27 </Style> 28 </ResourceDictionary> 29 </ResourceDictionary.MergedDictionaries> 30 </ResourceDictionary> 31 </UserControl.Resources> 32 <i:Interaction.Triggers> 33 <i:EventTrigger EventName="Loaded"> 34 <i:InvokeCommandAction Command="{Binding LoadedCommand}"></i:InvokeCommandAction> 35 </i:EventTrigger> 36 </i:Interaction.Triggers> 37 <Grid> 38 <Grid.RowDefinitions> 39 <RowDefinition Height="Auto"></RowDefinition> 40 <RowDefinition Height="Auto"></RowDefinition> 41 <RowDefinition Height="*"></RowDefinition> 42 <RowDefinition Height="Auto"></RowDefinition> 43 </Grid.RowDefinitions> 44 <TextBlock Text="班級資訊" FontSize="20" Background="AliceBlue" Margin="2"></TextBlock> 45 <StackPanel Grid.Row="1" Orientation="Horizontal" VerticalAlignment="Center"> 46 <TextBlock Text="專業" VerticalAlignment="Center" Margin="2"></TextBlock> 47 <TextBox Margin="4" MinWidth="120" Height="30" 48 Text="{Binding Dept}" 49 HorizontalContentAlignment="Stretch" 50 mahApps:TextBoxHelper.ClearTextButton="True" 51 mahApps:TextBoxHelper.Watermark="專業" 52 mahApps:TextBoxHelper.WatermarkAlignment="Left" 53 SpellCheck.IsEnabled="True" /> 54 <TextBlock Text="年級" VerticalAlignment="Center" Margin="2"></TextBlock> 55 <TextBox Margin="4" MinWidth="120" Height="30" 56 Text="{Binding Grade}" 57 HorizontalContentAlignment="Stretch" 58 mahApps:TextBoxHelper.ClearTextButton="True" 59 mahApps:TextBoxHelper.Watermark="年級" 60 mahApps:TextBoxHelper.WatermarkAlignment="Left" 61 SpellCheck.IsEnabled="True" /> 62 <Button Content="查詢" Style="{DynamicResource MahApps.Styles.Button.Square.Accent}" Width="120" Height="30" Margin="3" Command="{Binding QueryCommand}"></Button> 63 <Button Content="新增" Style="{DynamicResource MahApps.Styles.Button.Square.Accent}" Width="120" Height="30" Margin="3" Command="{Binding AddCommand}"></Button> 64 </StackPanel> 65 <DataGrid x:Name="dgClasses" 66 Grid.Row="2" 67 Grid.Column="0" 68 Margin="2" 69 AutoGenerateColumns="False" 70 CanUserAddRows="False" 71 CanUserDeleteRows="False" 72 ItemsSource="{Binding Classes}" 73 RowHeaderWidth="0"> 74 <DataGrid.Columns> 75 <DataGridTextColumn Binding="{Binding Dept}" Header="專業" Width="*" /> 76 <DataGridTextColumn Binding="{Binding Grade}" Header="年級" Width="*"/> 77 <DataGridTextColumn Binding="{Binding Name}" Header="班級" Width="*"/> 78 <DataGridTextColumn Binding="{Binding HeadTeacher}" Header="班主任" Width="*"/> 79 <DataGridTextColumn Binding="{Binding MonitorName}" Header="班長" Width="*" /> 80 <DataGridTemplateColumn Header="操作" Width="*"> 81 <DataGridTemplateColumn.CellTemplate> 82 <DataTemplate> 83 <StackPanel Orientation="Horizontal"> 84 <Button Content="Edit" Style="{StaticResource LinkButton}" Command="{Binding RelativeSource={RelativeSource AncestorType=DataGrid, Mode=FindAncestor}, Path=DataContext.EditCommand}" CommandParameter="{Binding Id}"> 85 <Button.Template> 86 <ControlTemplate TargetType="Button"> 87 <TextBlock TextDecorations="Underline" HorizontalAlignment="Center"> 88 <ContentPresenter /> 89 </TextBlock> 90 </ControlTemplate> 91 </Button.Template> 92 </Button> 93 <Button Content="Delete" Style="{StaticResource LinkButton}" Command="{Binding RelativeSource={RelativeSource AncestorType=DataGrid, Mode=FindAncestor}, Path=DataContext.DeleteCommand}" CommandParameter="{Binding Id}"> 94 <Button.Template> 95 <ControlTemplate TargetType="Button"> 96 <TextBlock TextDecorations="Underline" HorizontalAlignment="Center"> 97 <ContentPresenter /> 98 </TextBlock> 99 </ControlTemplate> 100 </Button.Template> 101 </Button> 102 </StackPanel> 103 </DataTemplate> 104 </DataGridTemplateColumn.CellTemplate> 105 </DataGridTemplateColumn> 106 </DataGrid.Columns> 107 </DataGrid> 108 <ctrls:PageControl Grid.Row="3" DataContext="{Binding}" ></ctrls:PageControl> 109 </Grid> 110 </UserControl>
新增編輯頁面
班級的新增功能和編輯功能，共用一個頁面，涉及知識點如下所示：
- 在新增編輯的ViewModel中，班級物體是一個屬性，所以在視圖控制元件中進行資料系結時，需要帶上屬性名，如：Classes.Name ，
- 班長串列在新增班級時尚無對應學生，可為空，待維護學生后，可通過學生串列進行選擇即可，
- 班長串列為Combox下拉框，系結的是學生物體串列，但客戶端只需看到學生姓名即可，所以需要重寫DataTemplate，只顯示學生姓名，
新增班級資訊視圖，具體代碼如下所示：
1 <UserControl x:Class="SIMS.ClassesModule.Views.AddEditClasses" 2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 4 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 5 xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 6 xmlns:local="clr-namespace:SIMS.ClassesModule.Views" 7 mc:Ignorable="d" 8 xmlns:i="http://schemas.microsoft.com/xaml/behaviors" 9 xmlns:mahApps ="http://metro.mahapps.com/winfx/xaml/controls" 10 xmlns:prism="http://prismlibrary.com/" 11 d:DesignHeight="400" d:DesignWidth="600"> 12 <prism:Dialog.WindowStyle> 13 <Style TargetType="Window"> 14 <Setter Property="Width" Value="600"></Setter> 15 <Setter Property="Height" Value="400"></Setter> 16 </Style> 17 </prism:Dialog.WindowStyle> 18 <UserControl.Resources> 19 <ResourceDictionary> 20 <ResourceDictionary.MergedDictionaries> 21 <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" /> 22 <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Themes/Light.Blue.xaml" /> 23 </ResourceDictionary.MergedDictionaries> 24 </ResourceDictionary> 25 </UserControl.Resources> 26 <i:Interaction.Triggers> 27 <i:EventTrigger EventName="Loaded"> 28 <i:InvokeCommandAction Command="{Binding LoadedCommand}"></i:InvokeCommandAction> 29 </i:EventTrigger> 30 </i:Interaction.Triggers> 31 <Grid> 32 <Grid.ColumnDefinitions> 33 <ColumnDefinition Width="0.2*"></ColumnDefinition> 34 <ColumnDefinition Width="Auto"></ColumnDefinition> 35 <ColumnDefinition Width="*"></ColumnDefinition> 36 <ColumnDefinition Width="0.2*"></ColumnDefinition> 37 </Grid.ColumnDefinitions> 38 <Grid.RowDefinitions> 39 <RowDefinition></RowDefinition> 40 <RowDefinition></RowDefinition> 41 <RowDefinition></RowDefinition> 42 <RowDefinition></RowDefinition> 43 <RowDefinition></RowDefinition> 44 <RowDefinition></RowDefinition> 45 <RowDefinition></RowDefinition> 46 </Grid.RowDefinitions> 47 48 49 <TextBlock Text="專業" Grid.Row="0" Grid.Column="1" VerticalAlignment="Center" Margin="3"></TextBlock> 50 <TextBox Grid.Row="0" Grid.Column="2" MinWidth="120" Height="35" VerticalAlignment="Center" Margin="3" Text="{Binding Classes.Dept}"></TextBox> 51 <TextBlock Text="年級" Grid.Row="1" Grid.Column="1" VerticalAlignment="Center" Margin="3"></TextBlock> 52 <TextBox Grid.Row="1" Grid.Column="2" MinWidth="120" Height="35" VerticalAlignment="Center" Margin="3" Text="{Binding Classes.Grade}"></TextBox> 53 <TextBlock Text="班級" Grid.Row="2" Grid.Column="1" VerticalAlignment="Center" Margin="3"></TextBlock> 54 <TextBox Grid.Row="2" Grid.Column="2" MinWidth="120" Height="35" VerticalAlignment="Center" Margin="3" Text="{Binding Classes.Name}"></TextBox> 55 <TextBlock Text="班主任" Grid.Row="3" Grid.Column="1" VerticalAlignment="Center" Margin="3"></TextBlock> 56 <TextBox Grid.Row="3" Grid.Column="2" MinWidth="120" Height="35" VerticalAlignment="Center" Margin="3" Text="{Binding Classes.HeadTeacher}"></TextBox> 57 <TextBlock Text="班長" Grid.Row="4" Grid.Column="1" VerticalAlignment="Center" Margin="3"></TextBlock> 58 <ComboBox Grid.Row="4" Grid.Column="2" MinWidth="120" Height="35" ItemsSource="{Binding Monitors}" mahApps:TextBoxHelper.ClearTextButton="True" SelectedItem="{Binding Monitor}"> 59 <ComboBox.ItemTemplate> 60 <DataTemplate> 61 <TextBlock Text="{Binding Name}"></TextBlock> 62 </DataTemplate> 63 </ComboBox.ItemTemplate> 64 </ComboBox> 65 <StackPanel Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="2" Orientation="Horizontal" HorizontalAlignment="Center" Margin="3"> 66 <Button Content="取消" Margin="5" MinWidth="120" Height="35" Style="{DynamicResource MahApps.Styles.Button.Square.Accent}" Command="{Binding CancelCommand}"></Button> 67 <Button Content="保存" Margin="5" MinWidth="120" Height="35" Style="{DynamicResource MahApps.Styles.Button.Square.Accent}" Command="{Binding SaveCommand}"></Button> 68 </StackPanel> 69 <TextBlock Grid.Row="6" Grid.Column="1" Grid.ColumnSpan="2" Text="注意：新增班級時，班長可空，等維護學生后，再設定班長，" Foreground="Red"></TextBlock> 70 </Grid> 71 </UserControl>
3. 客戶端ViewModel
班級管理模塊，ViewModel和視圖對應，也分為查詢串列ViewModel和新增編輯ViewModel，如下所示：
ClassesViewModel頁面代碼分為三部分：
- 屬性和建構式，主要用于資料系結，如查詢條件，串列等，所有屬性的set賦值時，均采用SetProperty進行賦值，
- 命令Command，如查詢，新增，編輯，洗掉命令等，所有命令可以定義成DelegateCommand型別，
- 分頁部分，因分頁功能代碼大同小異，所以此處略去，
ClassesViewModel具體代碼如下所示：
1 namespace SIMS.ClassesModule.ViewModels 2 { 3 public class ClassesViewModel :BindableBase 4 { 5 #region 屬性及建構式 6 7 /// <summary> 8 /// 專業 9 /// </summary> 10 private string dept; 11 12 public string Dept 13 { 14 get { return dept; } 15 set { SetProperty(ref dept , value); } 16 } 17 18 /// <summary> 19 /// 年級 20 /// </summary> 21 private string grade; 22 23 public string Grade 24 { 25 get { return grade; } 26 set { SetProperty(ref grade , value); } 27 } 28 29 30 31 private ObservableCollection<ClassesInfo> classes; 32 33 public ObservableCollection<ClassesInfo> Classes 34 { 35 get { return classes; } 36 set { SetProperty(ref classes, value); } 37 } 38 39 private IDialogService dialogService; 40 41 public ClassesViewModel(IDialogService dialogService) 42 { 43 this.dialogService = dialogService; 44 this.pageNum = 1; 45 this.pageSize = 20; 46 } 47 48 private void InitInfo() 49 { 50 Classes = new ObservableCollection<ClassesInfo>(); 51 var pagedRequst = ClassesHttpUtil.GetClassess(this.Dept,this.Grade, this.pageNum, this.pageSize); 52 var entities = pagedRequst.items; 53 Classes.AddRange(entities.Select(r=>new ClassesInfo(r))); 54 // 55 this.TotalCount = pagedRequst.count; 56 this.TotalPage = ((int)Math.Ceiling(this.TotalCount * 1.0 / this.pageSize)); 57 } 58 59 #endregion 60 61 #region 事件 62 63 private DelegateCommand loadedCommand; 64 65 public DelegateCommand LoadedCommand 66 { 67 get 68 { 69 if (loadedCommand == null) 70 { 71 loadedCommand = new DelegateCommand(Loaded); 72 } 73 return loadedCommand; 74 } 75 } 76 77 private void Loaded() 78 { 79 InitInfo(); 80 } 81 82 private DelegateCommand queryCommand; 83 84 public DelegateCommand QueryCommand 85 { 86 get 87 { 88 if (queryCommand == null) 89 { 90 queryCommand = new DelegateCommand(Query); 91 } 92 return queryCommand; 93 } 94 } 95 96 private void Query() { 97 this.pageNum = 1; 98 this.InitInfo(); 99 } 100 101 /// <summary> 102 /// 新增命令 103 /// </summary> 104 private DelegateCommand addCommand; 105 106 public DelegateCommand AddCommand 107 { 108 get 109 { 110 if (addCommand == null) 111 { 112 addCommand = new DelegateCommand(Add); 113 } 114 return addCommand; 115 } 116 } 117 118 private void Add() 119 { 120 this.dialogService.ShowDialog("addEditClasses",null, AddEditCallBack, "MetroDialogWindow"); 121 } 122 123 private void AddEditCallBack(IDialogResult dialogResult) { 124 if (dialogResult != null && dialogResult.Result == ButtonResult.OK) { 125 //重繪串列 126 this.pageNum = 1; 127 this.InitInfo(); 128 } 129 } 130 131 /// <summary> 132 /// 編輯命令 133 /// </summary> 134 private DelegateCommand<object> editCommand; 135 136 public DelegateCommand<object> EditCommand 137 { 138 get 139 { 140 if (editCommand == null) 141 { 142 editCommand = new DelegateCommand<object>(Edit); 143 } 144 return editCommand; 145 } 146 } 147 148 private void Edit(object obj) 149 { 150 if (obj == null) { 151 return; 152 } 153 var Id = int.Parse(obj.ToString()); 154 var classes = this.Classes.FirstOrDefault(r => r.Id == Id); 155 if (classes == null) 156 { 157 MessageBox.Show("無效的班級ID"); 158 return; 159 } 160 if (MessageBoxResult.Yes != MessageBox.Show("Are you sure to delete?", "Confirm", MessageBoxButton.YesNo)) 161 { 162 return; 163 } 164 IDialogParameters dialogParameters = new DialogParameters(); 165 dialogParameters.Add("classes",classes); 166 this.dialogService.ShowDialog("addEditClasses", dialogParameters, AddEditCallBack, "MetroDialogWindow"); 167 } 168 169 /// <summary> 170 /// 編輯命令 171 /// </summary> 172 private DelegateCommand<object> deleteCommand; 173 174 public DelegateCommand<object> DeleteCommand 175 { 176 get 177 { 178 if (deleteCommand == null) 179 { 180 deleteCommand = new DelegateCommand<object>(Delete); 181 } 182 return deleteCommand; 183 } 184 } 185 186 private void Delete(object obj) 187 { 188 if (obj == null) 189 { 190 return; 191 } 192 var Id = int.Parse(obj.ToString()); 193 var classes = this.Classes.FirstOrDefault(r => r.Id == Id); 194 if (classes == null) 195 { 196 MessageBox.Show("無效的班級ID"); 197 return; 198 } 199 bool flag = ClassesHttpUtil.DeleteClasses(Id); 200 if (flag) { 201 this.pageNum = 1; 202 this.InitInfo(); 203 } 204 } 205 206 #endregion 207 208 } 209 }
AddEditClassesViewModel代碼同樣分為三部分：
- 屬性和建構式，主要用于資料系結，如頁面文本框，下拉選擇框等，
- 命令Command，主要用于回應事件，如保存，取消等，
- 對話框介面，因為新增編輯是以彈出框的形式呈現，所以根據Prism框架的 要求，需要實作IDialogAware介面，
AddEditClassesViewModel具體代碼如下所示：
1 namespace SIMS.ClassesModule.ViewModels 2 { 3 public class AddEditClassesViewModel : BindableBase, IDialogAware 4 { 5 #region 屬性和建構式 6 7 /// <summary> 8 /// 班級物體 9 /// </summary> 10 private ClassesInfo classes; 11 12 public ClassesInfo Classes 13 { 14 get { return classes; } 15 set { SetProperty(ref classes ,value); } 16 } 17 18 private List<StudentEntity> monitors; 19 20 public List<StudentEntity> Monitors 21 { 22 get { return monitors; } 23 set { SetProperty(ref monitors , value); } 24 } 25 26 private StudentEntity monitor; 27 28 public StudentEntity Monitor 29 { 30 get { return monitor; } 31 set { SetProperty(ref monitor, value); } 32 } 33 34 public AddEditClassesViewModel() { 35 36 } 37 38 #endregion 39 40 #region Command 41 42 private DelegateCommand loadedCommand; 43 44 public DelegateCommand LoadedCommand 45 { 46 get 47 { 48 if (loadedCommand == null) 49 { 50 loadedCommand = new DelegateCommand(Loaded); 51 } 52 return loadedCommand; 53 } 54 } 55 56 private void Loaded() 57 { 58 this.Monitors= new List<StudentEntity>(); 59 if (Classes?.Id>0) { 60 var pagedRequst = StudentHttpUtil.GetStudentsByClasses(Classes.Id); 61 var entities = pagedRequst.items; 62 Monitors.AddRange(entities); 63 //如果有班長，則為班長賦值 64 if (Classes.Monitor > 0) { 65 this.Monitor= this.Monitors?.FirstOrDefault(r=>r.Id==Classes.Monitor); 66 } 67 } 68 69 } 70 71 private DelegateCommand cancelCommand; 72 73 public DelegateCommand CancelCommand 74 { 75 get 76 { 77 if (cancelCommand == null) 78 { 79 cancelCommand = new DelegateCommand(Cancel); 80 } 81 return cancelCommand; 82 } 83 } 84 85 private void Cancel() 86 { 87 RequestClose?.Invoke((new DialogResult(ButtonResult.Cancel))); 88 } 89 90 private DelegateCommand saveCommand; 91 92 public DelegateCommand SaveCommand 93 { 94 get 95 { 96 if (saveCommand == null) 97 { 98 saveCommand = new DelegateCommand(Save); 99 } 100 return saveCommand; 101 } 102 } 103 104 private void Save() { 105 if (Classes != null) { 106 Classes.CreateTime = DateTime.Now; 107 Classes.LastEditTime = DateTime.Now; 108 if (Monitor != null) { 109 Classes.Monitor = Monitor.Id; 110 } 111 bool flag=false; 112 if (Classes.Id > 0) { 113 flag = ClassesHttpUtil.UpdateClasses(Classes); 114 } 115 else { 116 flag = ClassesHttpUtil.AddClasses(Classes); 117 } 118 if (flag) 119 { 120 RequestClose?.Invoke((new DialogResult(ButtonResult.OK))); 121 } 122 } 123 } 124 125 126 #endregion 127 128 #region 對話框 129 130 public string Title => "新增或編輯班級資訊"; 131 132 public event Action<IDialogResult> RequestClose; 133 134 public bool CanCloseDialog() 135 { 136 return true; 137 } 138 139 public void OnDialogClosed() 140 { 141 142 } 143 144 public void OnDialogOpened(IDialogParameters parameters) 145 { 146 if (parameters != null && parameters.ContainsKey("classes")) 147 { 148 this.Classes = parameters.GetValue<ClassesInfo>("classes"); 149 } 150 else { 151 this.Classes = new ClassesInfo(); 152 } 153 } 154 155 #endregion 156 157 } 158 }
4. 示例截圖
班級管理示例截圖，如下所示：
學生管理
1. 介面訪問類StudentHttpUtil
學生資料表結構和服務介面，在第二篇文章中已有介紹，如有疑問，可前往參考，介面訪問類用于封裝訪問服務端提供的介面，如下所示：
1 namespace SIMS.Utils.Http 2 { 3 /// <summary> 4 /// 學生類Http訪問通用類 5 /// </summary> 6 public class StudentHttpUtil:HttpUtil 7 { 8 /// <summary> 9 /// 通過id查詢學生資訊 10 /// </summary> 11 /// <param name="id"></param> 12 /// <returns></returns> 13 public static StudentEntity GetStudent(int id) 14 { 15 Dictionary<string, object> data = https://www.cnblogs.com/hsiang/archive/2022/06/01/new Dictionary<string, object>(); 16 data["id"] = id; 17 var str = Get(UrlConfig.STUDENT_GETSTUDENT, data); 18 var student = StrToObject<StudentEntity>(str); 19 return student; 20 } 21 22 public static PagedRequest<StudentEntity> GetStudents(string no,string name, int pageNum, int pageSize) { 23 Dictionary<string, object> data = https://www.cnblogs.com/hsiang/archive/2022/06/01/new Dictionary<string, object>(); 24 data["no"] = no; 25 data["name"] = name; 26 data["pageNum"] = pageNum; 27 data["pageSize"] = pageSize; 28 var str = Get(UrlConfig.STUDENT_GETSTUDENTS, data); 29 var students = StrToObject<PagedRequest<StudentEntity>>(str); 30 return students; 31 } 32 33 public static PagedRequest<StudentEntity> GetStudentsByClasses(int classId) 34 { 35 Dictionary<string, object> data = https://www.cnblogs.com/hsiang/archive/2022/06/01/new Dictionary<string, object>(); 36 data["classId"] = classId; 37 var str = Get(UrlConfig.STUDENT_GETSTUDENTSBYCLASSES, data); 38 var students = StrToObject<PagedRequest<StudentEntity>>(str); 39 return students; 40 } 41 42 public static bool AddStudent(StudentEntity student) 43 { 44 var ret = Post<StudentEntity>(UrlConfig.STUDENT_ADDSTUDENT, student); 45 return int.Parse(ret) == 0; 46 } 47 48 public static bool UpdateStudent(StudentEntity student) 49 { 50 var ret = Put<StudentEntity>(UrlConfig.STUDENT_UPDATESTUDENT, student); 51 return int.Parse(ret) == 0; 52 } 53 54 public static bool DeleteStudent(int Id) 55 { 56 Dictionary<string, string> data = https://www.cnblogs.com/hsiang/archive/2022/06/01/new Dictionary<string, string>(); 57 data["Id"] = Id.ToString(); 58 var ret = Delete(UrlConfig.STUDENT_DELETESTUDENT, data); 59 return int.Parse(ret) == 0; 60 } 61 } 62 }
2. 客戶端頁面視圖
學生管理模塊的客戶端視圖頁面，也分為兩個：學生串列查詢，新增編輯學生資訊頁面，
學生串列查詢頁面
學生資訊串列頁面設計知識點，和班級管理差不多，只有一點差異：
- 在資料庫中，性別保存的是bit型別，在C#中，資料型別為bool，但是在串列中需要轉換成男或女顯示，所以需要用到Converter進行轉換，
學生資訊查詢頁面，具體代碼如下所示：
1 <UserControl x:Class="SIMS.StudentModule.Views.Student" 2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 4 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 5 xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 6 xmlns:local="clr-namespace:SIMS.StudentModule.Views" 7 xmlns:i="http://schemas.microsoft.com/xaml/behaviors" 8 xmlns:mahApps ="http://metro.mahapps.com/winfx/xaml/controls" 9 xmlns:prism="http://prismlibrary.com/" 10 xmlns:ctrls ="clr-namespace:SIMS.Utils.Controls;assembly=SIMS.Utils" 11 xmlns:conv="clr-namespace:SIMS.Utils.Converter;assembly=SIMS.Utils" 12 mc:Ignorable="d" 13 prism:ViewModelLocator.AutoWireViewModel="True" 14 d:DesignHeight="450" d:DesignWidth="800"> 15 16 <UserControl.Resources> 17 <ResourceDictionary> 18 <ResourceDictionary.MergedDictionaries> 19 <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" /> 20 <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Themes/Light.Blue.xaml" /> 21 <ResourceDictionary> 22 <conv:SexConverter x:Key="SexConverter"></conv:SexConverter> 23 <Style x:Key="LinkButton" TargetType="Button"> 24 <Setter Property="Background" Value="White"></Setter> 25 <Setter Property="Cursor" Value="Hand"></Setter> 26 <Setter Property="Margin" Value="3"></Setter> 27 <Setter Property="MinWidth" Value="80"></Setter> 28 <Setter Property="MinHeight" Value="25"></Setter> 29 <Setter Property="BorderThickness" Value="0 0 0 0"></Setter> 30 </Style> 31 </ResourceDictionary> 32 </ResourceDictionary.MergedDictionaries> 33 </ResourceDictionary> 34 </UserControl.Resources> 35 <i:Interaction.Triggers> 36 <i:EventTrigger EventName="Loaded"> 37 <i:InvokeCommandAction Command="{Binding LoadedCommand}"></i:InvokeCommandAction> 38 </i:EventTrigger> 39 </i:Interaction.Triggers> 40 <Grid> 41 <Grid.RowDefinitions> 42 <RowDefinition Height="Auto"></RowDefinition> 43 <RowDefinition Height="Auto"></RowDefinition> 44 <RowDefinition Height="*"></RowDefinition> 45 <RowDefinition Height="Auto"></RowDefinition> 46 </Grid.RowDefinitions> 47 <TextBlock Text="學生資訊" FontSize="20" Background="AliceBlue" Margin="2"></TextBlock> 48 <StackPanel Grid.Row="1" Orientation="Horizontal" VerticalAlignment="Center"> 49 <TextBlock Text="學號" VerticalAlignment="Center" Margin="2"></TextBlock> 50 <TextBox Margin="4" MinWidth="120" Height="30" 51 Text="{Binding No}" 52 HorizontalContentAlignment="Stretch" 53 mahApps:TextBoxHelper.ClearTextButton="True" 54 mahApps:TextBoxHelper.Watermark="學號" 55 mahApps:TextBoxHelper.WatermarkAlignment="Left" 56 SpellCheck.IsEnabled="True" /> 57 <TextBlock Text="姓名" VerticalAlignment="Center" Margin="2"></TextBlock> 58 <TextBox Margin="4" MinWidth="120" Height="30" 59 Text="{Binding Name}" 60 HorizontalContentAlignment="Stretch" 61 mahApps:TextBoxHelper.ClearTextButton="True" 62 mahApps:TextBoxHelper.Watermark="學生姓名" 63 mahApps:TextBoxHelper.WatermarkAlignment="Left" 64 SpellCheck.IsEnabled="True" /> 65 <Button Content="查詢" Style="{DynamicResource MahApps.Styles.Button.Square.Accent}" Width="120" Height="30" Margin="3" Command="{Binding QueryCommand}"></Button> 66 <Button Content="新增" Style="{DynamicResource MahApps.Styles.Button.Square.Accent}" Width="120" Height="30" Margin="3" Command="{Binding AddCommand}"></Button> 67 </StackPanel> 68 <DataGrid x:Name="dgStudent" 69 Grid.Row="2" 70 Grid.Column="0" 71 Margin="2" 72 AutoGenerateColumns="False" 73 CanUserAddRows="False" 74 CanUserDeleteRows="False" 75 ItemsSource="{Binding Students}" 76 RowHeaderWidth="0"> 77 <DataGrid.Columns> 78 <DataGridTextColumn Binding="{Binding No}" Header="學號" Width="*" /> 79 <DataGridTextColumn Binding="{Binding Name}" Header="姓名" Width="*"/> 80 <DataGridTextColumn Binding="{Binding Age}" Header="年齡" Width="*"/> 81 <DataGridTextColumn Binding="{Binding Sex, Converter={StaticResource SexConverter}}" Header="性別" Width="*"/> 82 <DataGridTextColumn Binding="{Binding ClassesName}" Header="班級" Width="*" /> 83 <DataGridTemplateColumn Header="操作" Width="*"> 84 <DataGridTemplateColumn.CellTemplate> 85 <DataTemplate> 86 <StackPanel Orientation="Horizontal"> 87 <Button Content="Edit" Style="{StaticResource LinkButton}" Command="{Binding RelativeSource={RelativeSource AncestorType=DataGrid, Mode=FindAncestor}, Path=DataContext.EditCommand}" CommandParameter="{Binding Id}" > 88 <Button.Template> 89 <ControlTemplate TargetType="Button"> 90 <TextBlock TextDecorations="Underline" HorizontalAlignment="Center"> 91 <ContentPresenter /> 92 </TextBlock> 93 </ControlTemplate> 94 </Button.Template> 95 </Button> 96 <Button Content="Delete" Style="{StaticResource LinkButton}" Command="{Binding RelativeSource={RelativeSource AncestorType=DataGrid, Mode=FindAncestor}, Path=DataContext.DeleteCommand}" CommandParameter="{Binding Id}"> 97 <Button.Template> 98 <ControlTemplate TargetType="Button"> 99 <TextBlock TextDecorations="Underline" HorizontalAlignment="Center"> 100 <ContentPresenter /> 101 </TextBlock> 102 </ControlTemplate> 103 </Button.Template> 104 </Button> 105 </StackPanel> 106 </DataTemplate> 107 </DataGridTemplateColumn.CellTemplate> 108 </DataGridTemplateColumn> 109 </DataGrid.Columns> 110 </DataGrid> 111 <ctrls:PageControl Grid.Row="3" DataContext="{Binding}" ></ctrls:PageControl> 112 </Grid> 113 </UserControl>
新增編輯頁面
新增編輯頁面涉及知識點和班級新增頁面差不多，僅有一處差異：
- C#中的bool型別，需要系結到兩個單選按鈕上，以表示男，女，所以需要擴展，
新增編輯頁面，具體代碼如下所示：
1 <UserControl x:Class="SIMS.StudentModule.Views.AddEditStudent" 2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 4 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 5 xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 6 xmlns:local="clr-namespace:SIMS.StudentModule.Views" 7 xmlns:i="http://schemas.microsoft.com/xaml/behaviors" 8 xmlns:mahApps ="http://metro.mahapps.com/winfx/xaml/controls" 9 xmlns:prism="http://prismlibrary.com/" 10 mc:Ignorable="d" 11 d:DesignHeight="450" d:DesignWidth="600"> 12 <prism:Dialog.WindowStyle> 13 <Style TargetType="Window"> 14 <Setter Property="Width" Value="600"></Setter> 15 <Setter Property="Height" Value="400"></Setter> 16 </Style> 17 </prism:Dialog.WindowStyle> 18 <UserControl.Resources> 19 <ResourceDictionary> 20 <ResourceDictionary.MergedDictionaries> 21 <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml" /> 22 <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Themes/Light.Blue.xaml" /> 23 </ResourceDictionary.MergedDictionaries> 24 </ResourceDictionary> 25 </UserControl.Resources> 26 <i:Interaction.Triggers> 27 <i:EventTrigger EventName="Loaded"> 28 <i:InvokeCommandAction Command="{Binding LoadedCommand}"></i:InvokeCommandAction> 29 </i:EventTrigger> 30 </i:Interaction.Triggers> 31 <Grid> 32 <Grid.ColumnDefinitions> 33 <ColumnDefinition Width="0.2*"></ColumnDefinition> 34 <ColumnDefinition Width="Auto"></ColumnDefinition> 35 <ColumnDefinition Width="*"></ColumnDefinition> 36 <ColumnDefinition Width="0.2*"></ColumnDefinition> 37 </Grid.ColumnDefinitions> 38 <Grid.RowDefinitions> 39 <RowDefinition></RowDefinition> 40 <RowDefinition></RowDefinition> 41 <RowDefinition></RowDefinition> 42 <RowDefinition></RowDefinition> 43 <RowDefinition></RowDefinition> 44 <RowDefinition></RowDefinition> 45 </Grid.RowDefinitions> 46 47 48 <TextBlock Text="學號" Grid.Row="0" Grid.Column="1" VerticalAlignment="Center" Margin="3"></TextBlock> 49 <TextBox Grid.Row="0" Grid.Column="2" MinWidth="120" Height="35" VerticalAlignment="Center" Margin="3" Text="{Binding Student.No}"></TextBox> 50 <TextBlock Text="姓名" Grid.Row="1" Grid.Column="1" VerticalAlignment="Center" Margin="3"></TextBlock> 51 <TextBox Grid.Row="1" Grid.Column="2" MinWidth="120" Height="35" VerticalAlignment="Center" Margin="3" Text="{Binding Student.Name}"></TextBox> 52 <TextBlock Text="年齡" Grid.Row="2" Grid.Column="1" VerticalAlignment="Center" Margin="3"></TextBlock> 53 <TextBox Grid.Row="2" Grid.Column="2" MinWidth="120" Height="35" VerticalAlignment="Center" Margin="3" Text="{Binding Student.Age}"></TextBox> 54 <TextBlock Text="性別" Grid.Row="3" Grid.Column="1" VerticalAlignment="Center" Margin="3"></TextBlock> 55 <StackPanel Grid.Row="3" Grid.Column="2" Orientation="Horizontal" > 56 <RadioButton Content="男" IsChecked="{Binding Student.IsBoy}"></RadioButton> 57 <RadioButton Content="女" IsChecked="{Binding Student.IsGirl}"></RadioButton> 58 </StackPanel> 59 60 <TextBlock Text="班級" Grid.Row="4" Grid.Column="1" VerticalAlignment="Center" Margin="3"></TextBlock> 61 <ComboBox Grid.Row="4" Grid.Column="2" MinWidth="120" Height="35" ItemsSource="{Binding Classess}" mahApps:TextBoxHelper.ClearTextButton="True" SelectedItem="{Binding Classes}"> 62 <ComboBox.ItemTemplate> 63 <DataTemplate> 64 <StackPanel Orientation="Horizontal"> 65 <TextBlock Text="{Binding Dept}"></TextBlock> 66 <TextBlock Text="{Binding Grade}"></TextBlock> 67 <TextBlock Text="{Binding Name}"></TextBlock> 68 </StackPanel> 69 </DataTemplate> 70 </ComboBox.ItemTemplate> 71 </ComboBox> 72 <StackPanel Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="2" Orientation="Horizontal" HorizontalAlignment="Center" Margin="3"> 73 <Button Content="取消" Margin="5" MinWidth="120" Height="35" Style="{DynamicResource MahApps.Styles.Button.Square.Accent}" Command="{Binding CancelCommand}" ></Button> 74 <Button Content="保存" Margin="5" MinWidth="120" Height="35" Style="{DynamicResource MahApps.Styles.Button.Square.Accent}" Command="{Binding SaveCommand}"></Button> 75 </StackPanel> 76 </Grid> 77 </UserControl>
3. 客戶端ViewModel
學生管理客戶端ViewModel，與頁面視圖對應，也分為兩個部分
StudentViewModel代碼分為三部分：
- 屬性和建構式，主要用于資料系結，如查詢條件，串列等，所有屬性的set賦值時，均采用SetProperty進行賦值，
- 命令Command，如查詢，新增，編輯，洗掉命令等，所有命令可以定義成DelegateCommand型別，
- 分頁部分，因分頁功能代碼大同小異，所以此處略去，
StudentViewModel具體代碼如下所示：
1 namespace SIMS.StudentModule.ViewModels 2 { 3 public class StudentViewModel:BindableBase 4 { 5 #region 屬性及建構式 6 7 /// <summary> 8 /// 學號 9 /// </summary> 10 private string no; 11 12 public string No 13 { 14 get { return no; } 15 set { SetProperty(ref no , value); } 16 } 17 18 /// <summary> 19 /// 學生姓名 20 /// </summary> 21 private string name; 22 23 public string Name 24 { 25 get { return name; } 26 set { SetProperty(ref name, value); } 27 } 28 29 private ObservableCollection<StudentInfo> students; 30 31 public ObservableCollection<StudentInfo> Students 32 { 33 get { return students; } 34 set { SetProperty(ref students, value); } 35 } 36 37 private IDialogService dialogService; 38 39 public StudentViewModel(IDialogService dialogService) { 40 this.dialogService = dialogService; 41 this.pageNum = 1; 42 this.pageSize = 20; 43 } 44 45 private void InitInfo() { 46 Students = new ObservableCollection<StudentInfo>(); 47 var pagedRequst = StudentHttpUtil.GetStudents(this.No,this.Name, this.pageNum, this.pageSize); 48 var entities = pagedRequst.items; 49 Students.AddRange(entities.Select(r=>new StudentInfo(r))); 50 // 51 this.TotalCount = pagedRequst.count; 52 this.TotalPage=((int)Math.Ceiling(this.TotalCount*1.0/this.pageSize)); 53 } 54 55 #endregion 56 57 #region 事件 58 59 private DelegateCommand loadedCommand; 60 61 public DelegateCommand LoadedCommand 62 { 63 get 64 { 65 if (loadedCommand == null) 66 { 67 loadedCommand = new DelegateCommand(Loaded); 68 } 69 return loadedCommand; 70 } 71 } 72 73 private void Loaded() 74 { 75 InitInfo(); 76 } 77 78 /// <summary> 79 /// 新增命令 80 /// </summary> 81 private DelegateCommand addCommand; 82 83 public DelegateCommand AddCommand 84 { 85 get 86 { 87 if (addCommand == null) 88 { 89 addCommand = new DelegateCommand(Add); 90 } 91 return addCommand; 92 } 93 } 94 95 private void Add() 96 { 97 this.dialogService.ShowDialog("addEditStudent", null, AddEditCallBack, "MetroDialogWindow"); 98 } 99 100 private void AddEditCallBack(IDialogResult dialogResult) 101 { 102 if (dialogResult != null && dialogResult.Result == ButtonResult.OK) 103 { 104 //重繪串列 105 this.pageNum = 1; 106 this.InitInfo(); 107 } 108 } 109 110 /// <summary> 111 /// 編輯命令 112 /// </summary> 113 private DelegateCommand<object> editCommand; 114 115 public DelegateCommand<object> EditCommand 116 { 117 get 118 { 119 if (editCommand == null) 120 { 121 editCommand = new DelegateCommand<object>(Edit); 122 } 123 return editCommand; 124 } 125 } 126 127 private void Edit(object obj) { 128 if (obj == null) 129 { 130 return; 131 } 132 var Id = int.Parse(obj.ToString()); 133 var student = this.Students.FirstOrDefault(r => r.Id == Id); 134 if (student == null) 135 { 136 MessageBox.Show("無效的學生ID"); 137 return; 138 } 139 if (MessageBoxResult.Yes != MessageBox.Show("Are you sure to delete?", "Confirm", MessageBoxButton.YesNo)) 140 { 141 return; 142 } 143 IDialogParameters dialogParameters = new DialogParameters(); 144 dialogParameters.Add("student", student); 145 this.dialogService.ShowDialog("addEditStudent", dialogParameters, AddEditCallBack, "MetroDialogWindow"); 146 } 147 148 /// <summary> 149 /// 編輯命令 150 /// </summary> 151 private DelegateCommand<object> deleteCommand; 152 153 public DelegateCommand<object> DeleteCommand 154 { 155 get 156 { 157 if (deleteCommand == null) 158 { 159 deleteCommand = new DelegateCommand<object>(Delete); 160 } 161 return deleteCommand; 162 } 163 } 164 165 private void Delete(object obj) 166 { 167 if (obj == null) 168 { 169 return; 170 } 171 var Id = int.Parse(obj.ToString()); 172 var classes = this.Students.FirstOrDefault(r => r.Id == Id); 173 if (classes == null) 174 { 175 MessageBox.Show("無效的學生ID"); 176 return; 177 } 178 bool flag = StudentHttpUtil.DeleteStudent(Id); 179 if (flag) 180 { 181 this.pageNum = 1; 182 this.InitInfo(); 183 } 184 } 185 186 #endregion 187 188 } 189 }
AddEditStudentViewModel代碼同樣分為三部分：
- 屬性和建構式，主要用于資料系結，如頁面文本框，下拉選擇框等，
- 命令Command，主要用于回應事件，如保存，取消等，
- 對話框介面，因為新增編輯是以彈出框的形式呈現，所以根據Prism框架的 要求，需要實作IDialogAware介面，(實作介面代碼大同小異，在此略去)
AddEditStudentViewModel具體代碼如下所示：
1 namespace SIMS.StudentModule.ViewModels 2 { 3 public class AddEditStudentViewModel : BindableBase, IDialogAware 4 { 5 6 /// <summary> 7 /// 班級物體 8 /// </summary> 9 private ClassesEntity classes; 10 11 public ClassesEntity Classes 12 { 13 get { return classes; } 14 set { SetProperty(ref classes, value); } 15 } 16 17 /// <summary> 18 /// 班級串列 19 /// </summary> 20 private List<ClassesEntity> classess; 21 22 public List<ClassesEntity> Classess 23 { 24 get { return classess; } 25 set { SetProperty(ref classess, value); } 26 } 27 28 private StudentInfo student; 29 30 public StudentInfo Student 31 { 32 get { return student; } 33 set { student = value; } 34 } 35 36 public AddEditStudentViewModel() { 37 38 } 39 40 #region Command 41 42 private DelegateCommand loadedCommand; 43 44 public DelegateCommand LoadedCommand 45 { 46 get 47 { 48 if (loadedCommand == null) 49 { 50 loadedCommand = new DelegateCommand(Loaded); 51 } 52 return loadedCommand; 53 } 54 } 55 56 private void Loaded() 57 { 58 this.Classess = new List<ClassesEntity>(); 59 var pagedRequst = ClassesHttpUtil.GetClassess(null,null,1,0);//0表示所有班級 60 var entities = pagedRequst.items; 61 Classess.AddRange(entities); 62 } 63 64 private DelegateCommand cancelCommand; 65 66 public DelegateCommand CancelCommand 67 { 68 get 69 { 70 if (cancelCommand == null) 71 { 72 cancelCommand = new DelegateCommand(Cancel); 73 } 74 return cancelCommand; 75 } 76 } 77 78 private void Cancel() { 79 RequestClose?.Invoke((new DialogResult(ButtonResult.Cancel))); 80 } 81 82 private DelegateCommand saveCommand; 83 84 public DelegateCommand SaveCommand 85 { 86 get 87 { 88 if (saveCommand == null) 89 { 90 saveCommand = new DelegateCommand(Save); 91 } 92 return saveCommand; 93 } 94 } 95 96 private void Save() 97 { 98 if (Student != null) 99 { 100 Student.CreateTime = DateTime.Now; 101 Student.LastEditTime = DateTime.Now; 102 bool flag = false; 103 if (Classes != null) { 104 Student.ClassesId = Classes.Id; 105 } 106 if (Student.Id > 0) 107 { 108 flag = StudentHttpUtil.UpdateStudent(Student); 109 } 110 else 111 { 112 flag = StudentHttpUtil.AddStudent(Student); 113 } 114 if (flag) 115 { 116 RequestClose?.Invoke((new DialogResult(ButtonResult.OK))); 117 } 118 } 119 } 120 121 #endregion 122 } 123 }
4. 示例截圖
學生管理示例截圖，如下所示：
總結
通過本篇文章的班級管理模塊，學生管理模塊，以及上一篇文章中的課程管理模塊，不難發現，每一個模塊的開發都是由串列DataGrid，文本框TextBox，下拉框Combox，單選按鈕RadioButton，按鈕Button等組成的，雖功能略有差異，但總歸萬變不離其宗，開發方法也大同小異，復雜的功能都是普通的功能累加起來的，這也是本系列文章由淺入深的漸進安排，希望能夠拋磚引玉，不局限于某一功能，而是能夠舉一反三，自我理解，以達到自我開發的能力，
作者：小六公子
出處：http://www.cnblogs.com/hsiang/
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標籤：.NET技术