当箭头键按下时，文本框键控事件不会触发 [英] Textbox Keydown event not firing when arrow key press

问题描述

我有一个DataGridTemplateColumn的datagrid，如下所示：

 < my：DataGrid Name =dgvSalesRowHeight =23SelectionUnit =CellBeginningEdit =dgvSales_BeginningEditAutoGenerateColumns =FalseCellEditEnding =dgvSales_CellEditEnding> 
< my：DataGrid.Columns> 
< my：DataGridTemplateColumn Header =Product NameWidth =200> 
< my：DataGridTemplateColumn.CellTemplate> 
< DataTemplate> 
< TextBlock Text ={Binding Product_Name}>< / TextBlock> 
< / DataTemplate> 
< / my：DataGridTemplateColumn.CellTemplate> 
< my：DataGridTemplateColumn.CellEditingTemplate> 
< DataTemplate> 
< TextBox x：Name =txtbxProductText ={Binding Product_Name}TextChanged =txtbxProduct_TextChangedKeyDown =txtbxProduct_KeyDown>< / TextBox> 
< / DataTemplate> 
< / my：DataGridTemplateColumn.CellEditingTemplate> 
< / my：DataGridTemplateColumn> 
< / my：DataGrid.Columns> 
< / my：DataGrid> 
  

当单元格值更改时，我想将一些项目填充到列表视图中，TextChanged事件如下：

  private void txtbxProduct_TextChanged（object sender，TextChangedEventArgs e）
 {
 TextBox tb =（TextBox）发件人
 if（tb.Text.Trim（）！=）
 {
 string qry =选择PL.Record_Id作为PList_Id，PM.Record_Id作为Product_Id，PM.Product_Code，PM。 Product_Name，PTM.Product_Type，PL.Purchase_Rate，PL.Selling_Rate，PL.MRP from dbo.Tbl_Product_Master PM加入Tbl_Product_List PL PL.Product_Id = PM.Record_Id在PTM上连接Tbl_Product_Type_Master PTM.Record_Id = PM.Product_Category_Id其中PL.Batch_Flag = 0和PM.Is_Del ='false'和PM.Is_Active ='true'和PM.Product_Name像'％'+ tb.Text.Trim（）+％由PM.Product_Name命令; 
 DataSet ds = ObjCommon.GetObject.ExecuteQuery_Select（Connection.ConnectionString，qry）; 
 if（ds.Tables [0] .Rows.Count> 0）
 {
 lstvwProductCode.ItemsSource = ds.Tables [0] .DefaultView; 
 lstvwProductCode.Visibility = Visibility.Visible; 
} 
 else 
 {
 lstvwProductCode.ItemsSource = null; 
 lstvwProductCode.Visibility = Visibility.Collapsed; 
} 
} 
 else 
 {
 lstvwProductCode.ItemsSource = null; 
 lstvwProductCode.Visibility = Visibility.Collapsed; 
} 
} 
  

当用户输入键盘上的向下键时想要专注于listview，但是当我按Down，Back，Space等键时，它不会触发Keydown事件，但其他键，如字母数字键都可以正常工作。我的keydown事件如下：

  private void txtbxProduct_KeyDown（object sender，KeyEventArgs e）
 {
 TextBox tb =（TextBox）sender; 
 if（e.Key == Key.Escape）
 {
 tb.Clear（）; 
 lstvwProductCode.Visibility = Visibility.Collapsed; 
 tb.Focus（）; 
} 
 else if（e.Key == Key.Down）
 {
 if（lstvwProductCode.Items.Count> 0）
 {
 lstvwProductCode.SelectedIndex = 0; 
 lstvwProductCode.Focus（）; 
 lstvwProductCode.Visibility = Visibility.Visible; 
} 
} 
} 
  

我在代码？

解决方案

而不是使用 PreviewKeyDown

I have a datagrid with one column as DataGridTemplateColumn as follows :

<my:DataGrid Name="dgvSales"   RowHeight="23"  SelectionUnit="Cell"  BeginningEdit="dgvSales_BeginningEdit"  AutoGenerateColumns="False"   CellEditEnding="dgvSales_CellEditEnding" >
                   <my:DataGrid.Columns>
                        <my:DataGridTemplateColumn Header="Product Name" Width="200">
                            <my:DataGridTemplateColumn.CellTemplate>
                                <DataTemplate>
                                    <TextBlock Text="{Binding Product_Name}"></TextBlock>
                                </DataTemplate>
                            </my:DataGridTemplateColumn.CellTemplate>
                            <my:DataGridTemplateColumn.CellEditingTemplate>
                                <DataTemplate>
                                    <TextBox x:Name="txtbxProduct" Text="{Binding Product_Name}" TextChanged="txtbxProduct_TextChanged" KeyDown="txtbxProduct_KeyDown"></TextBox>
                                </DataTemplate>
                            </my:DataGridTemplateColumn.CellEditingTemplate>
                        </my:DataGridTemplateColumn>
                 </my:DataGrid.Columns>
</my:DataGrid>

When the cell value change I want to populate some items to the listview ,the TextChanged event is as follows :

 private void txtbxProduct_TextChanged(object sender, TextChangedEventArgs e)
    {
        TextBox tb = (TextBox)sender;
        if (tb.Text.Trim() != "")
        {
            string qry = "select PL.Record_Id as PList_Id,PM.Record_Id as Product_Id,PM.Product_Code,PM.Product_Name,PTM.Product_Type,PL.Purchase_Rate ,PL.Selling_Rate,PL.MRP  from dbo.Tbl_Product_Master PM  join Tbl_Product_List PL on PL.Product_Id=PM.Record_Id   join Tbl_Product_Type_Master PTM on PTM.Record_Id=PM.Product_Category_Id where PL.Batch_Flag=0  and PM.Is_Del='false'and PM.Is_Active='true'  and PM.Product_Name like '%" + tb.Text.Trim() + "%'  order by PM.Product_Name ";
            DataSet ds = ObjCommon.GetObject.ExecuteQuery_Select(Connection.ConnectionString, qry);
            if (ds.Tables[0].Rows.Count > 0)
            {
                lstvwProductCode.ItemsSource = ds.Tables[0].DefaultView;
                lstvwProductCode.Visibility = Visibility.Visible;
            }
            else
            {
                lstvwProductCode.ItemsSource = null;
                lstvwProductCode.Visibility = Visibility.Collapsed;
            }
        }
        else
        {
            lstvwProductCode.ItemsSource = null;
            lstvwProductCode.Visibility = Visibility.Collapsed;
        }
    }

When the User enter the down key on the keyboard I want to focus on the listview but It won't fire the Keydown event when I press Down,Back,Space etc keys ,But other keys like alphanumeric keys all working fine .My keydown event is as follows :

private void txtbxProduct_KeyDown(object sender, KeyEventArgs e)
    {
        TextBox tb = (TextBox)sender;
        if (e.Key == Key.Escape)
        {
            tb.Clear();
            lstvwProductCode.Visibility = Visibility.Collapsed;
            tb.Focus();
        }
        else if (e.Key == Key.Down)
        {
            if (lstvwProductCode.Items.Count > 0)
            {
                lstvwProductCode.SelectedIndex = 0;
                lstvwProductCode.Focus();
                lstvwProductCode.Visibility = Visibility.Visible;
            }
        }
    }

What I did wrong in my code ?

解决方案

Instead of that Use PreviewKeyDown

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