当我双击WPF DataGrid行以获取单元格值时,返回NULL

在检索单元格内容之前,您可能需要检查当前选定的计数是否不为零。只是一个小代码来帮助你。

 private void dtgTarafAvval_MouseDoubleClick(object sender, MouseButtonEventArgs e)
    {
        if(dtgTarafAvval.SelectedCells.Count > 0)
        {
            CellValue = GetSelectedValue(dtgTarafAvval);
            //CellValue is a variable of type string.

        }
    }

    private string GetSelectedValue(DataGrid grid)
    {
        DataGridCellInfo cellInfo = grid.SelectedCells[0];
        if (cellInfo == null) return null;

        DataGridBoundColumn column = cellInfo.Column as DataGridBoundColumn;
        if (column == null) return null;

        FrameworkElement element = new FrameworkElement() { DataContext = cellInfo.Item };
        BindingOperations.SetBinding(element, TagProperty, column.Binding);

        return element.Tag.ToString();
    }

PS:以上代码适用于SelectionUnit='FullRow'

MouseDoubleClick 的事件 DataGridRow 容器和铸件 DataContext

<DataGrid x:Name="dtgTarafDovvom" Style="{StaticResource DataGridStyle1}" ItemsSource="{Binding}">
    <DataGrid.RowStyle>
        <Style TargetType="DataGridRow">
            <EventSetter Event="MouseDoubleClick" Handler="dtgTarafDovvom_MouseDoubleClick" />
        </Style>
    </DataGrid.RowStyle>
    <DataGrid.Columns>
        <DataGridTextColumn Binding="{Binding Path=TarafeynQarardadID}" Header="کد " />
    </DataGrid.Columns>
</DataGrid>

private void dtgTarafAvval_MouseDoubleClick(object sender, ouseButtonEventArgs e)
{
    DataGridRow row = sender as DataGridRow;
    TarafeynQarardadDTO t = row.DataContext as TarafeynQarardadDTO;
    int tarafeynID = t.TarafeynQarardadID;
}