Question

这里我使用了一个wpf ComboBox控件并使用数据源绑定它。但我的组合框无法设置我给出的第一个索引的默认选择在绑定的时候manualy。这里我的代码可以告诉我如何在combox框中设置默认项目。

// XAML中

<ComboBox Height="23" HorizontalAlignment="Left" Margin="142,11,0,0" Name="cmbProductType" VerticalAlignment="Top" Width="180" ItemsSource="{Binding}" />

//代码

private void Window_Loaded(object sender, RoutedEventArgs e)
    {

        ClsControl.GetProductTypeList(cmbProductType);
    }
 public static void GetProductTypeList(ComboBox ddlProductType)//Add By Sandeep On 11-03-2013
    {
        try
        {
            DataTable dtProductType = null;
            try
            {
                ClsDataLayer objDataLayer = new ClsDataLayer();
                dtProductType = objDataLayer.ExecuteDataTable("COMNODE_PROC_GetProductTypeList");
                if (dtProductType != null && dtProductType.Rows.Count > 0)
                {
                    DataRow drCardType = dtProductType.NewRow();
                    drCardType[0] = -1;
                    drCardType[1] = "< -- Select Card Type -- >";
                    ddlProductType.SelectedValue = -1;
                    dtProductType.Rows.InsertAt(drCardType, 0);
                    ddlProductType.ItemsSource = dtProductType.DefaultView;
                    ddlProductType.DisplayMemberPath = "PRODUCT_TYPE";
                    ddlProductType.SelectedValuePath = "PRODUCT_TYPE_ID";
                }
            }
            catch (Exception)
            {
                throw;
            }
        }
        catch
        {
        }
    }

Answer 1

尝试将您的XAML更新为：

<ComboBox Height="23" 
          HorizontalAlignment="Left" 
          Margin="142,11,0,0" 
          Name="cmbProductType" 
          VerticalAlignment="Top" 
          Width="180" 
          ItemsSource="{Binding}" 
          IsSynchronizedWithCurrentItem="True" />

此外，当您选择项目时，请使用SelectedIndex：

            ddlProductType.SelectedIndex = 0;
            dtProductType.Rows.InsertAt(drCardType, 0);
            ddlProductType.ItemsSource = dtProductType.DefaultView;
            ddlProductType.DisplayMemberPath = "PRODUCT_TYPE";
            ddlProductType.SelectedValuePath = "PRODUCT_TYPE_ID"

默认选择在wpf中不起作用

1 个答案: