我顯然是 WPF 和 MVVM 的新手，但我正在努力理解和學習。我似乎無法正確系結。我只在應用程式的一個組件中作業，我做錯了什么。我的模型主要來自 EF，也有一些小例外。當我在這個例子中更新組合框時，沒有任何變化，我嘗試了一堆不同的機制，但我太新了，無法掌握。（在 Windows 表單中要容易得多）
我有一個用戶控制元件
<UserControl x:Class="ClinPath.StudyManagement.Components.SM_StudyDetails"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:ClinPath.StudyManagement.Components"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800"
xmlns:uc ="clr-namespace:ClinPath.WPFControls"
xmlns:vm="clr-namespace:ClinPath.StudyManagement.ViewModel">
<UserControl.DataContext>
<vm:SM_StudyDetail_VM/>
</UserControl.DataContext>
<!--#region StudyDetails-->
<Grid Grid.Row="1" Grid.ColumnSpan="9" DataContext="{Binding StudyCPV}">
<!--#region StudyDetails Column 1-->
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Text="StudyName: " FontSize="12" TextAlignment="Right" />
<TextBlock Grid.Row="1" Grid.Column="0" Text="Species: " FontSize="12" TextAlignment="Right"/>
<TextBlock Grid.Row="2" Grid.Column="0" Text="Study Director: " FontSize="12" TextAlignment="Right"/>
<TextBlock Grid.Row="3" Grid.Column="0" Text="CP Coordinator: " FontSize="12" TextAlignment="Right"/>
<TextBlock Grid.Row="4" Grid.Column="0" Text="Start Date: " FontSize="12" TextAlignment="Right"/>
<TextBlock Grid.Row="5" Grid.Column="0" Text="Comments: " FontSize="12" TextAlignment="Right"/>
<Grid Grid.Column="1">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="4*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<ComboBox IsEditable="True" Visibility="Hidden">
<ComboBoxItem>Orange</ComboBoxItem>
<ComboBoxItem>Apple</ComboBoxItem>
<ComboBoxItem>Banana</ComboBoxItem>
<ComboBoxItem>Cherry</ComboBoxItem>
<ComboBox.Triggers>
<EventTrigger RoutedEvent="TextBoxBase.TextChanged">
<BeginStoryboard>
<Storyboard>
<BooleanAnimationUsingKeyFrames Storyboard.TargetProperty="IsDropDownOpen">
<DiscreteBooleanKeyFrame Value="True" KeyTime="0:0:0"/>
</BooleanAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</ComboBox.Triggers>
</ComboBox>
<Button Grid.Column="1" Command="{Binding VerifyStudy}"/> ICommand verify and update the source of the fields.
</Grid>
<ComboBox
x:Name ="cboStudyDirector"
Grid.Row="2" Grid.Column="1"
FontSize="12" IsEditable="True"
ItemsSource="{Binding cboStudyDirectorV}"
SelectedValuePath="empID" DisplayMemberPath="employeeName"
/> //Selected Value needs TO BIND TO Field studyDirectorID in ObservableCollection cpStudy and updated the selected DropDown
<DatePicker x:Name ="dateStart" Grid.Row="4" Grid.Column="1" FontSize="12"/> //NEEDS TO BIND TO Field startDate in ObservableCollection cpStudyV
<TextBox x:Name ="txComment" Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="3" Text="Stuff" FontSize="12"/> //NEEDS TO BIND TO Field Comment in ObservableCollection cpStudy
<!--#endregion-->
</Grid>
<!--#endregion-->
我也有我的虛擬機（我知道它不應該加載資料，但我不確定如何從 .net 框架 4.8 中的 EF6 執行此操作）
using ClinPath.DataSets;
using ClinPath.StudyManagement.Commands;
using ClinPath.StudyManagement.Models;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls;
using System.Windows;
using System.Windows.Input;
using System.Xml.Linq;
using System.Security.Permissions;
namespace ClinPath.StudyManagement.ViewModel
{
public partial class SM_StudyDetail_VM : ViewModelBase
{
private StudyManagerDB db = new StudyManagerDB();
private ObservableCollection<StudyCP> studyCPV;
public ObservableCollection<StudyCP> StudyCPV
{
get { return studyCPV; }
set { studyCPV = value; OnPropertyChanged(nameof(StudyCPV)); }
}
private ObservableCollection<Species> speciesV;
public ObservableCollection<Species> SpeciesV
{
get { return speciesV; }
set { speciesV = value; OnPropertyChanged(nameof(SpeciesV)); }
}
public List<empComboObj> cboStudyDirectorV { get; set; }
public List<empComboObj> cboCPCoordinatorV { get; set; }
public List<empComboObj> cboClinicalPathologistV { get; set; }
public List<empComboObj> cboSMCoordinatorV { get; set; }
public List<empComboObj> cboStudySupervisorV { get; set; }
public List<string> studyNameList { get; set; }
public ICommand VerifyStudy { get; }
public string studyID { get; set; }
public ICollectionView ComboItems { get; set; }
public string comboText;
public string ComboText
{
get
{
return comboText;
//throw new NotImplementedException();
}
set
{
ComboItems.Filter = item => item.ToString().ToLower().Contains(value.ToLower());
}
}
public SM_StudyDetail_VM()
{
VerifyStudy = new SM_VerifyStudy(this);
ObservableCollection<StudyCP> _studyCPV = new ObservableCollection<StudyCP>();
var studyCPVList = db.StudyCPs.ToList();
foreach (var group in studyCPVList)
{
_studyCPV.Add(group);
}
StudyCPV = _studyCPV;
studyNameList = db.StudyCPs.Select(x => x.StudyNumber.ToString()).ToList();
SpeciesV = new ObservableCollection<Species>(db.Species);
cboStudyDirectorV = db.UserLists.Where(x => x.isStudyDirector == true ? true : false).Select(x => new empComboObj { empID = x.ID, employeeName = x.FirstName " " x.LastName }).ToList();
cboStudySupervisorV = db.UserLists.Where(x => x.isStudySupervisor == true ? true : false).Select(x => new empComboObj { empID = x.ID, employeeName = x.FirstName " " x.LastName }).ToList();
cboClinicalPathologistV = db.UserLists.Where(x => x.isClinicalPathologist == true ? true : false).Select(x => new empComboObj { empID = x.ID, employeeName = x.FirstName " " x.LastName }).ToList();
cboCPCoordinatorV = db.UserLists.Where(x => x.isCPCoordinator == true ? true : false).Select(x => new empComboObj { empID = x.ID, employeeName = x.FirstName " " x.LastName }).ToList();
cboSMCoordinatorV = db.UserLists.Where(x => x.isSMCoordinator == true ? true : false).Select(x => new empComboObj { empID = x.ID, employeeName = x.FirstName " " x.LastName }).ToList();
}
}
}
最后我有一個命令
using ClinPath.DataSets;
using ClinPath.StudyManagement.ViewModel;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
namespace ClinPath.StudyManagement.Commands
{
public class SM_Commands : CommandBase
{
public override void Execute(object parameter)
{
throw new NotImplementedException();
}
}
public class SM_VerifyStudy : CommandBase
{
private StudyManagerDB db = new StudyManagerDB();
private readonly SM_StudyDetail_VM _sM_StudyDetail_VM;
private readonly string _studyID;
public SM_VerifyStudy(SM_StudyDetail_VM sM_StudyDetail_VM)
{
_sM_StudyDetail_VM = sM_StudyDetail_VM;
_studyID = sM_StudyDetail_VM.comboText;
}
public override void Execute(object parameter)
{
string studyID = _sM_StudyDetail_VM.studyID;
_sM_StudyDetail_VM.StudyCPV = new ObservableCollection<StudyCP>(db.StudyCPs.Where(x => x.StudyNumber == studyID));
}
}
}
uj5u.com熱心網友回復：
放棄嘗試在這個專案中使用 WPF MVVM。專門移至代碼后面。現在作業100%。
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