前台代码

          <DataGrid.Columns>
                        <DataGridCheckBoxColumn Header="选择" Binding="{Binding Path=RUID}" x:Name="cRUID"></DataGridCheckBoxColumn>
                        <DataGridTextColumn Header="结算类型" Binding="{Binding Path=CTYP}" x:Name="cCTYP" IsReadOnly="True" ></DataGridTextColumn>

         </DataGrid.Columns>

后台：c#代码

：

        ///
        /// 全选
        ///
        ///
        ///
        private void btnQuanXuan_Click(object sender, RoutedEventArgs e)
        {
            for (int i = 0; i < this.dgList.Items.Count; i++)
            {
                var cntr = dgList.ItemContainerGenerator.ContainerFromIndex(i);
                DataGridRow ObjROw = (DataGridRow)cntr;
                if (ObjROw != null)
                {
                    FrameworkElement objElement = dgList.Columns[0].GetCellContent(ObjROw);
                    if (objElement != null)
                    {
                        //if (objElement.GetType().ToString().EndsWith("cRUID"))
                        //{
                            System.Windows.Controls.CheckBox objChk = (System.Windows.Controls.CheckBox)objElement;
                            if (objChk.IsChecked == false)
                            {
                                objChk.IsChecked = true;
                            }
                        //}
                    }
                }
            }
        }

   /// <summary>
        /// 全否
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnQuanFou_Click(object sender, RoutedEventArgs e)
        {
            for (int i = 0; i < this.dgList.Items.Count; i++)
            {
                var cntr = dgList.ItemContainerGenerator.ContainerFromIndex(i);
                DataGridRow ObjROw = (DataGridRow)cntr;
                if (ObjROw != null)
                {
                    FrameworkElement objElement = dgList.Columns[0].GetCellContent(ObjROw);
                    if (objElement != null)
                    {
                        //if (objElement.GetType().ToString().EndsWith("cRUID"))
                        //{
                        System.Windows.Controls.CheckBox objChk = (System.Windows.Controls.CheckBox)objElement;
                        if (objChk.IsChecked == true)
                        {
                            objChk.IsChecked = false;
                        }
                        //}
                    }
                }
            }
        }
        /// <summary>
        /// 反选
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnFanXuan_Click(object sender, RoutedEventArgs e)
        {
            for (int i = 0; i < this.dgList.Items.Count; i++)
            {
                var cntr = dgList.ItemContainerGenerator.ContainerFromIndex(i);
                DataGridRow ObjROw = (DataGridRow)cntr;
                if (ObjROw != null)
                {
                    FrameworkElement objElement = dgList.Columns[0].GetCellContent(ObjROw);
                    if (objElement != null)
                    {
                        //if (objElement.GetType().ToString().EndsWith("cRUID"))
                        //{
                        System.Windows.Controls.CheckBox objChk = (System.Windows.Controls.CheckBox)objElement;
                        if (objChk.IsChecked == false)
                        {
                            objChk.IsChecked = true;
                        }
                        else
                        {
                            objChk.IsChecked = false;
                        }
                        //}
                    }
                }
            }
        }

使用模板列全选：

前台代码：

        <DataGridCheckBoxColumn Binding="{Binding Path=RUID,RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type DataGridRow}}}" x:Name="cRUID">
                            <DataGridCheckBoxColumn.HeaderTemplate>
                                <DataTemplate>
                                <CheckBox x:Name="ckbSelectedAll" Content="全选" Checked="ckbSelectedAll_Checked" Unchecked="ckbSelectedAll_Unchecked" IsChecked="False"  />
                                </DataTemplate>
                            </DataGridCheckBoxColumn.HeaderTemplate>
                        </DataGridCheckBoxColumn>              
                             

后台 c#代码

:

        ///
        /// 全选
        ///
        ///
        ///
        private void ckbSelectedAll_Checked(object sender, RoutedEventArgs e)
        {
            this.dgList.SelectAll();
        }

        ///
        /// 全不选
        ///
        ///
        ///
        private void ckbSelectedAll_Unchecked(object sender, RoutedEventArgs e)
        {
            this.dgList.UnselectAll();
        }