wpf 當DataGrid列模版是ComboBox時，顯示資訊

? 實際作業中，有時DataGrid控制元件某一列顯示資料是從Enum集合里面選擇出來的，那這時候設定列模版為ComboBox就能滿足需求，而關于顯示的實際內容，直接是Enum的string()回傳值可能不太適合，這時候采用System.ComponentModel.Description是一個很好用的方法，

代碼中定義的顯示型別是Enum，實際結果在Description中宣告，

定義 Enum Week

    [System.ComponentModel.Description("星期")]
    public enum Week
    {
        [System.ComponentModel.Description("星期一")]
        Monday,

        [System.ComponentModel.Description("星期二")]
        Tuesday,

        [System.ComponentModel.Description("星期三")]
        Wednesday,

        [System.ComponentModel.Description("星期四")]
        Thursday,

        [System.ComponentModel.Description("星期五")]
        Firday,

        [System.ComponentModel.Description("星期六")]
        Saturday,

        [System.ComponentModel.Description("星期日")]
        Sunday,
    }

DataGrid模版：

<Grid.Resources>
    <Style x:Key="DataGridTextColumnStyle" TargetType="{x:Type TextBlock}">
        <Setter Property="VerticalAlignment" Value=https://www.cnblogs.com/njit-77/p/"Center"/>
        
    </style>
    
    <style TargetType="{x:Type DataGrid}">
        
        
        
        
        
        
        
        
        
        
        
        
            
                <style TargetType="DataGridCell">
                    <style.Triggers>
                        
                            
                        
                    
                </style>
            
        
        
            
                <style TargetType="DataGridColumnHeader">
                    
                </style>
            
        
    </style>



    
        
            
                
            
        
        
        
        
    
    
    
        
            
                
                    
                
            
        
        
        
    

WeekEnumToDescriptionConvertor、WeekEnumToComboBoxIndexConvertor實作代碼：

    class WeekEnumToComboBoxIndexConvertor : System.Windows.Data.IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return ((int)(Week)value);
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return ((Week)(int)value);
        }
    }

    class WeekEnumToDescriptionConvertor : System.Windows.Data.IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            var strValue = https://www.cnblogs.com/njit-77/p/value as string[];
            if (strValue != null)
            {
                var enValue = new Week[strValue.Length];
                for (int i = 0; i < strValue.Length; i++)
                {
                    if (Enum.TryParse(strValue[i], out enValue[i]))
                        strValue[i] = enValue[i].GetDescription();
                }
            }
            return value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

EnumHelper代碼：

    public static class EnumHelper
    {
        public static string GetDescription<T>(this T value) where T : struct
        {
            string result = value.ToString();

            var fi = typeof(T).GetField(result);

            var attributes = (System.ComponentModel.DescriptionAttribute[])fi.GetCustomAttributes(
                typeof(System.ComponentModel.DescriptionAttribute), true);

            if (attributes != null && attributes.Length > 0)
            {
                return attributes[0].Description;
            }
            return result;
        }

        public static T GetValueByDescription<T>(this string description) where T : struct
        {
            Type type = typeof(T);
            foreach (var field in type.GetFields())
            {
                if (field.Name == description)
                {
                    return (T)field.GetValue(null);
                }

                var attributes = (System.ComponentModel.DescriptionAttribute[])field.GetCustomAttributes(
                    typeof(System.ComponentModel.DescriptionAttribute), true);

                if (attributes != null && attributes.Length > 0)
                {
                    if (attributes[0].Description == description)
                    {
                        return (T)field.GetValue(null);
                    }
                }
            }
            throw new ArgumentException(string.Format($"{description} 未能找到對應的列舉"), "Description");
        }

        public static T GetValue<T>(this string value) where T : struct
        {
            T result;
            if (Enum.TryParse(value, true, out result))
            {
                return result;
            }
            throw new ArgumentException(string.Format($"{value} 未能找到對應的列舉"), "Value");
        }

    }

最終效果圖

完整代碼

標籤：WPF

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