DataGridTemplateColumn ：在使用 ItemsSource 之前，Items 集合必须为空。

Posted 2023-04-01

【中文标题】DataGridTemplateColumn ：在使用 ItemsSource 之前，Items 集合必须为空。

【英文标题】：DataGridTemplateColumn : Items collection must be empty before using ItemsSource.

【发布时间】：2021-07-19 15:32:53

【问题描述】：

为什么是错误代码：

        <dg:DataGrid  Name="dataGrid" AutoGenerateColumns="False"                                  
                HeadersVisibility="Column" SelectedIndex="-1" Margin="0,315,0,0" Background="#FF484040" BorderBrush="#FF484040">
        <dg:DataGrid.Columns>
            <dg:DataGridTextColumn Binding="Binding IdBook" Header="IdBook"></dg:DataGridTextColumn>
            <dg:DataGridTextColumn Binding="Binding NameBook" Header="NameBook"></dg:DataGridTextColumn>
            <dg:DataGridTextColumn Binding="Binding Author" Header="Author"></dg:DataGridTextColumn>
        </dg:DataGrid.Columns>

        <dg:DataGridTemplateColumn Header="Delete">

            <dg:DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <Button Style="DynamicResource GlassButton" Background="DynamicResource DeleteButton">

                    </Button>
                </DataTemplate>
            </dg:DataGridTemplateColumn.CellTemplate>

            </dg:DataGridTemplateColumn>
    </dg:DataGrid>

以下代码是正确的：

        <dg:DataGrid  Name="dataGrid" AutoGenerateColumns="False"                                  
                HeadersVisibility="Column" SelectedIndex="-1" Margin="0,315,0,0" Background="#FF484040" BorderBrush="#FF484040">
        <dg:DataGrid.Columns>
            <dg:DataGridTextColumn Binding="Binding IdBook" Header="IdBook"></dg:DataGridTextColumn>
            <dg:DataGridTextColumn Binding="Binding NameBook" Header="NameBook"></dg:DataGridTextColumn>
            <dg:DataGridTextColumn Binding="Binding Author" Header="Author"></dg:DataGridTextColumn>
        </dg:DataGrid.Columns>

    </dg:DataGrid>

但我不能将按钮添加到数据网格

【参考方案1】：

将模板列保留在 DataGrid.Columns 中。

     <dg:DataGrid  Name="dataGrid" AutoGenerateColumns="False"                                  
            HeadersVisibility="Column" SelectedIndex="-1" Margin="0,315,0,0" Background="#FF484040" BorderBrush="#FF484040">
    <dg:DataGrid.Columns>
        <dg:DataGridTextColumn Binding="Binding IdBook" Header="IdBook"></dg:DataGridTextColumn>
        <dg:DataGridTextColumn Binding="Binding NameBook" Header="NameBook"></dg:DataGridTextColumn>
        <dg:DataGridTextColumn Binding="Binding Author" Header="Author"></dg:DataGridTextColumn>
       <dg:DataGridTemplateColumn Header="Delete">
             <dg:DataGridTemplateColumn.CellTemplate>
                 <DataTemplate>
                       <Button Style="DynamicResource GlassButton" Background="DynamicResource DeleteButton">
                         </Button>
            </DataTemplate>
        </dg:DataGridTemplateColumn.CellTemplate>
        </dg:DataGridTemplateColumn>
    </dg:DataGrid.Columns>
  </<dg:DataGrid>

【讨论】：

噢！也忘记了 DataGrid.Columns。