实现DataGridView和DevExpress.GridControl表头全选功能

　1）DevExpress控件的GridView的实现多选操作

　　先讲DevExpress控件的GridView的实现，要实现的功能基本上是处理单击全选操作、重新绘制表头等操作，首先在加载第一步实现相关的事件和操作，如下所示。

 this.gridView1.Click += new System.EventHandler(this.gridView1_Click);
  this.gridView1.CustomDrawColumnHeader += 
new DevExpress.XtraGrid.Views.Grid.ColumnHeaderCustomDrawEventHandler
(this.gridView1_CustomDrawColumnHeader);
  this.gridView1.DataSourceChanged += 
new EventHandler(gridView1_DataSourceChanged);

　　然后就是实现里面的事件操作了，对应的代码如下所示。

        private void gridView1_Click(object sender, EventArgs e)
         {
  if (DevControlHelper.ClickGridCheckBox(this.gridView1,  "Check", m_checkStatus))
             { 
                 m_checkStatus = !m_checkStatus; 
             } 
         } 

         private void gridView1_CustomDrawColumnHeader
(object sender, DevExpress.XtraGrid.Views.Grid.ColumnHeaderCustomDrawEventArgs e) 
         { 
             if (e.Column != null  && e.Column.FieldName == "Check")
             { 
                 e.Info.InnerElements.Clear(); 
                 e.Painter.DrawObject(e.Info); 
                 DevControlHelper.DrawCheckBox(e, m_checkStatus); 
                 e.Handled = true; 
             } 
         } 
         void gridView1_DataSourceChanged(object sender, EventArgs e) 
         { 
             GridColumn column =
 this.gridView1.Columns.ColumnByFieldName( "Check");
             if (column != null) 
             { 
                 column.Width = 80; 
                 column.OptionsColumn.ShowCaption = false; 
                 column.ColumnEdit = new RepositoryItemCheckEdit(); 
             } 
        }

　　其中单击和绘制表头的操作，交给另外一个类DevControlHelper来独立进行处理，数据源变化gridView1_DataSourceChanged实现的操作是寻找对应的全选列，并设置列宽、隐藏表头标题，并设置为复选框样式。

　　DevControlHelper 类的实现代码如下所示：

        public static void DrawCheckBox
(DevExpress.XtraGrid.Views.Grid.ColumnHeaderCustomDrawEventArgs e, bool chk)
         {
             RepositoryItemCheckEdit repositoryCheck = 
e.Column.ColumnEdit as RepositoryItemCheckEdit; 
             if (repositoryCheck != null) 
             { 
                 Graphics g = e.Graphics; 
                 Rectangle r = e.Bounds; 

                 DevExpress.XtraEditors.ViewInfo.CheckEditViewInfo info; 
                 DevExpress.XtraEditors.Drawing.CheckEditPainter painter; 
                 DevExpress.XtraEditors.Drawing.ControlGraphicsInfoArgs args; 
                 info = repositoryCheck.CreateViewInfo() as
 DevExpress.XtraEditors.ViewInfo.CheckEditViewInfo; 

                 painter = repositoryCheck.CreatePainter() 
as DevExpress.XtraEditors.Drawing.CheckEditPainter; 
                 info.EditValue = chk; 
                 info.Bounds = r; 
                 info.CalcViewInfo(g); 
                 args = new DevExpress.XtraEditors.
Drawing.ControlGraphicsInfoArgs(info, new DevExpress.Utils.Drawing.GraphicsCache(g), r); 
                 painter.Draw(args); 
                 args.Cache.Dispose(); 
             } 
         } 

         public static bool ClickGridCheckBox
DevExpress.XtraGrid.Views.Grid.GridView gridView, string fieldName, bool currentStatus) 
         { 
             bool result = false; 
             if (gridView != null) 
             { 
                 gridView.ClearSorting();//禁止排序 

                 gridView.PostEditor(); 
                 DevExpress.XtraGrid.Views.Grid.ViewInfo.GridHitInfo info; 
                 Point pt = gridView.GridControl.PointToClient(Control.MousePosition); 
                 info = gridView.CalcHitInfo(pt); 
                 if (info.InColumn  && info.Column !=
 null && info.Column.FieldName == fieldName)
                 { 
                     for (int i = 0; i  < gridView.RowCount; i++)
                     { 
                         gridView.SetRowCellValue(i, fieldName, !currentStatus); 
                     } 
                     return true; 
                 } 
             } 
             return result; 
        } 

　　2）传统DataGridView实现全选操作

　　首先在第一列增加一个CheckBox控件，然后通过相关的事件，调整其位置，并相应对应的单击全选操作，初始化代码如下所示。

        CheckBox HeaderCheckBox = null;
         public FrmNormalGridViewSelect()
         { 
             InitializeComponent(); 

             if (!this.DesignMode) 
             { 
                 HeaderCheckBox = new CheckBox(); 
                 HeaderCheckBox.Size = new Size(15, 15); 
                 this.dgvSelectAll.Controls.Add(HeaderCheckBox); 

                 HeaderCheckBox.KeyUp += new KeyEventHandler(HeaderCheckBox_KeyUp); 
                 HeaderCheckBox.MouseClick += 
new MouseEventHandler(HeaderCheckBox_MouseClick); 
                 dgvSelectAll.CurrentCellDirtyStateChanged += 

new EventHandler(dgvSelectAll_CurrentCellDirtyStateChanged); 
                 dgvSelectAll.CellPainting +=
 new DataGridViewCellPaintingEventHandler(dgvSelectAll_CellPainting); 
             } 
    }

　　事件实现了CheckBox重绘调整，并处理单击事件，如下所示。

        private void HeaderCheckBox_MouseClick(object sender, MouseEventArgs e)
         {
             HeaderCheckBoxClick((CheckBox)sender); 
         } 

         private void dgvSelectAll_CellPainting(object sender, DataGridViewCellPaintingEventArgs e) 
         { 
             if (e.RowIndex == -1  && e.ColumnIndex == 0)
                     ResetHeaderCheckBoxLocation(e.ColumnIndex, e.RowIndex); 
         } 

         private void ResetHeaderCheckBoxLocation(int ColumnIndex, int RowIndex) 
         { 
             Rectangle oRectangle = 
this.dgvSelectAll.GetCellDisplayRectangle(ColumnIndex, RowIndex, true); 
             Point oPoint = new Point(); 
             oPoint.X =
 oRectangle.Location.X + (oRectangle.Width - HeaderCheckBox.Width) / 2 + 1; 
             oPoint.Y =
 oRectangle.Location.Y + (oRectangle.Height - HeaderCheckBox.Height) / 2 + 1; 
             HeaderCheckBox.Location = oPoint; 
         } 

         private void HeaderCheckBoxClick(CheckBox HCheckBox) 
         { 
             foreach (DataGridViewRow Row in dgvSelectAll.Rows) 
             { 
                 ((DataGridViewCheckBoxCell)Row.Cells[ "chkBxSelect"]).Value = HCheckBox.Checked;
             } 
             dgvSelectAll.RefreshEdit(); 
    }