WPF绑定到组合框

Question

您好在WPF中的一个快速问题。

有谁知道我怎么可以绑定一个组合框，将坐在一个网格到我有一个数据集。

该数据集包含几列和数行，但我想要采取其中一列，让我们说ProcessID，并只显示在COMOBO框。

有没有人以前做过或知道它如何在WPF中完成。

谢谢 Iffy。

Answer 1

您应该使用LINQ到SQL，ADO.Net或实体框架，以提取数据库中的数据，你不能在内存绑定数据库表的组合框，但丝毫数据

Answer 2

要做到这一点编程，这里的一个通用的功能，我有它：

/// <summary> 
    /// Thread safe method for databinding the specified ComboBox with the specified data. 
    /// </summary> 
    /// <typeparam name="T"></typeparam> 
    /// <param name="ctrl">The Combo to be databound.</param> 
    /// <param name="datasource">The data to be bound to the Combo.</param> 
    /// <param name="displayPath">The name of the property in the data objects that should be used for the display value.</param> 
    /// <param name="valuePath">The name of the property in the data objects that should be used for the value.</param> 
    /// <remarks> 
    /// This function was written as generic so that it doesn't matter what types the IEnumerabe datasource is, it can handle them all. 
    /// </remarks> 
    private void UpdateComboDataSource<T>(ComboBox ctrl, IEnumerable<T> datasource, string displayPath, string valuePath) 
    { 
     if (ctrl == null) 
      throw new ArgumentNullException("Control to be bound must not be null"); 

     //check if we are on the control's UI thread: 
     if (ctrl.Dispatcher.CheckAccess()) 
     { 
      //we have full access to the control, no threading issues, so let's rip it up and databind it 
      datasource = datasource.OrderBy(x => x); 
      if (displayPath != null && ctrl.DisplayMemberPath == null) 
       ctrl.DisplayMemberPath = displayPath; 
      if (valuePath != null && ctrl.SelectedValuePath == null) 
       ctrl.SelectedValuePath = valuePath; 

      ctrl.ItemsSource = datasource; 

      //be nice to the user, if there is only one item then automatically select it 
      ctrl.SelectedIndex = datasource.Count() == 1 ? 0 : -1; 
     } 
     else 
     { 
      //we don't have full access to the control because we are running on a different thread, so 
      //we need to marshal a call to this function from the control's UI thread 
      UpdateComboDataSourceDelegate<T> del = new UpdateComboDataSourceDelegate<T>(this.UpdateComboDataSource); 
      ctrl.Dispatcher.BeginInvoke(del, ctrl, datasource, displayPath, valuePath); 
     } 
    } 

    private delegate void UpdateComboDataSourceDelegate<T>(ComboBox ctrl, IEnumerable<T> dataSource, string displayPath, string valuePath); 

评论告诉你你需要知道的一切。它也可以通过在控件的ItemSource属性和页面上的公共属性之间创建一个Binding来完成 - 这与它声明式的做法是一样的（尽管如此，必须有十亿个例子，所以我赢了'在这里展示）。

Answer 3

假设这是一个大写d数据集可以暴露于XAML作为一个DataContext对象上的属性（表示“LookupTable中”表每行的“描述”栏）：

<ComboBox ItemsSource="{Binding Path=MyDataSetExposedAsAProperty.Tables[LookupTable].Rows}" 
DisplayMemberPath=".[Description]"/>