一個控制項繫結多個欄位

WPF隨手筆記

WPF 的資料繫結允許多個欄位與一個控制項繫結, 使用以下步驟說明:

1. 撰寫一類別, 實作IMultiValueConverter介面, 處理多個欄位連接成一個值的作業

       public class NameConverter : IMultiValueConverter {
   
            public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
           {           
               string name;
               name = values[0] + " " + values[1];           
               return name;
           }
   
           public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
           {           
               string[] splitValues = ((string)value).Split(' ');
               return splitValues;
           }
   
       }

   
   



2. 在Windows.Resource宣告這個類別為資源
   

       <Window.Resources>    
           <c:NameConverter x:Key="NameConverter"/>    
           <ObjectDataProvider x:Key="NorthwindDataSetDS" ObjectType="{x:Type WpfDataBinding:NorthwindDataSet}" d:IsDataSource="True"/>    
       </Window.Resources>
       
       <Window.DataContext>    
           <Binding Path="Employees" Mode="Default" Source="{StaticResource NorthwindDataSetDS}"/>    
       </Window.DataContext>

   
   



3. 在控制項要繫結的屬性上使用MultiBinding設定Converter及繫結的欄位
   

   <TextBox Margin="32,80,69.6,0" VerticalAlignment="Top" Height="48" TextWrapping="Wrap">    
               <TextBox.Text>    
                   <MultiBinding Converter="{StaticResource NameConverter}"     
                       ConverterParameter="FormatLastFirst">    
                       <Binding Path="FirstName" />    
                       <Binding Path="LastName" />    
                   </MultiBinding>    
               </TextBox.Text>    
           </TextBox>

   
   

繫結Northwind的Employees Table, 執行結果: