与所选项目进行多重绑定的组合框？

Question

我试图做到以下几点：

Data Binding in Combobox

但多结合..这意味着我要超过一个结合更多..

所以我可以显示，例如，作为全名名字+姓氏。

我们该怎么做？

谢谢！

Answer 1

添加ItemTemplate这样的：

<ComboBox.ItemTemplate> 
    <DataTemplate> 
     <TextBlock> 
      <TextBlock.Text> 
       <MultiBinding StringFormat="{}{0}, {1}"> 
        <Binding Path="LastName" /> 
        <Binding Path="FirstName" /> 
       </MultiBinding> 
      </TextBlock.Text> 
     </TextBlock> 
    </DataTemplate> 
</ComboBox.ItemTemplate> 

（StringFormat Reference）

旁注：在实际的代码中，我更频繁地使用Dean's method，但是这是做事的方式MultiBinding。

Answer 2

您可以创建一个绑定，MultiBinding如下：

<TextBlock> 
    <TextBlock.Text> 
    <MultiBinding Converter=" ... " ... > 
     <Binding Path="FirstName" /> 
     <Binding Path="LastName" /> 
    </MultiBinding> 
    </TextBlock.Text> 
</TextBlock> 

Answer 3

你指的是一些简单的像这样

<ComboBox> 
    <ComboBox.ItemTemplate> 
     <DataTemplate> 
      <TextBlock> 
       <Run Text="{Binding FirstName}" /> 
       <Run Text=" " /> 
       <Run Text="{Binding LastName}" /> 
      </TextBlock> 
     </DataTemplate> 
    </ComboBox.ItemTemplate> 
</ComboBox> 

Answer 4

这里给出的例子是几乎所有你所需要的。

http://msdn.microsoft.com/en-us/library/system.windows.data.multibinding.aspx

只是交换TextBlock的一个组合框，并绑定到它的SelectedItem而不是Text属性。

Answer 5

这样创建MultiBinding：

<Window x:Class="WpfTestApp.MainWindow" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:WpfTestApp="clr-namespace:WpfTestApp" Title="MainWindow" Height="350" Width="525" > 
<Window.Resources> 
    <WpfTestApp:ConcatenateStringsConverter x:Key="_concatenateStringsConverter" /> 
</Window.Resources> 

<Grid x:Name="LayoutRoot" Style="{StaticResource RectangleHighlighter}"> 
    <ComboBox Width="200" Height="40"> 
     <ComboBox.Items> 
      <ComboBoxItem > 
       <ComboBoxItem.Content> 
        <TextBlock> 
         <TextBlock.Text> 
          <MultiBinding Converter="{StaticResource _concatenateStringsConverter}"> 
           <Binding Mode="OneWay" Path="FirstName" /> 
           <Binding Mode="OneWay" Path="LastName" /> 
          </MultiBinding> 
         </TextBlock.Text> 
        </TextBlock> 
       </ComboBoxItem.Content> 
      </ComboBoxItem> 
     </ComboBox.Items> 
    </ComboBox> 

</Grid> 
</Window> 

我已经使用MainWindowViewModel作为窗口的DataContext的：

public partial class MainWindow : Window 
{ 
public MainWindow() 
    { 
     InitializeComponent(); 
     DataContext = new MainWindowViewModel(); 
    } 
} 


public class MainWindowViewModel :INotifyPropertyChanged 
{ 
    public MainWindowViewModel() 
    { 
     FirstName = "Souvik"; 
     LastName = "Basu"; 
    } 


    private string _firstName; 
    public string FirstName 
    { 
     get { return _firstName; } 
     set 
     { 
      if (_firstName != value) 
      { 
       _firstName = value; 
       OnPropertyChange("FirstName"); 
      } 
     } 
    } 
    private string _lastName; 
    public string LastName 
    { 
     get { return _lastName; } 
     set 
     { 
      if (_lastName != value) 
      { 
       _lastName = value; 
       OnPropertyChange("LastName"); 
      } 
     } 
    } 

    protected void OnPropertyChange(string propertyName) 
    { 
     if(PropertyChanged != null) 
      PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 
    } 
} 

转换器串接多个绑定值..

class ConcatenateStringsConverter : IMultiValueConverter 
{ 
    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     return values[0].ToString() + " " + values[1].ToString(); 
    } 

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