彩票走势图

可以在GrideView上增加数据源没有的列，如合计、日期、序号或其他数据源等。

今天将会为大家介绍两种方法：

方法一：实现CustomColumnDisplayText事件（只能用于显示）

以下例子在bandedGridColumn1上显示 FirstName+LastName

bandedGridColumn1.OptionsColumn.AllowEdit = false;

private void bandedGridView1_CustomColumnDisplayText(object sender, DevExpress.XtraGrid.Views.Base.CustomColumnDisplayTextEventArgs e)

{

if(e.Column.Equals(bandedGridColumn1))

{
DataRow row = bandedGridView1.GetDataRow(e.RowHandle);

e.DisplayText = string.Format("{0} {1}", row["FirstName"], row["LastName"]);

}

}

方法二： 设定列的UnboundType，并实现CustomUnboundColumnData事件（可修改值）

以下例子演示DateTime/Int/String 绑定到数据列上显示。当修改 GrideView上的值时，将修改同步到原数组中。

bandedGridColumn4.UnboundType = DevExpress.Data.UnboundColumnType.DateTime;

bandedGridColumn5.UnboundType = DevExpress.Data.UnboundColumnType.Integer;

bandedGridColumn6.UnboundType = DevExpress.Data.UnboundColumnType.String;


private void bandedGridView1_CustomUnboundColumnData(object sender, DevExpress.XtraGrid.Views.Base.CustomColumnDataEventArgs e) {

if(array == null) return;

if(e.ListSourceRowIndex >= array.Count) return;

Record rec = array[e.ListSourceRowIndex] as Record;

if(rec == null) return;

switch(e.Column.UnboundType) {

case UnboundColumnType.DateTime:

if(e.IsGetData)


e.Value = rec.Date;

else rec.Date = (DateTime)e.Value;

break;

case UnboundColumnType.Integer:

if(e.IsGetData)

e.Value = rec.Count;

else rec.Count = (Int32)e.Value;

break;

case UnboundColumnType.String:

if(e.IsGetData)

e.Value = rec.Comment;

else rec.Comment = e.Value.ToString();

break;

}

}


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提交当前行的修改
using DevExpress.XtraGrid;
using DevExpress.XtraGrid.Views.Base;
using System.Data.Common;
//...
public void UpdateDatasource(GridControl grid) {
//Save the latest changes to the bound DataTable
ColumnView view = (ColumnView)grid.FocusedView;
view.CloseEditor();
if(!view.UpdateCurrentRow()) return;

//Update the database's Suppliers table to which oleDBDataAdapter1 is connected
DoUpdate(oleDbDataAdapter1, dataSet11.Tables["Suppliers"]);
//Update the database's Products table to which the oleDbDataAdapter2 is connected
DoUpdate(oleDbDataAdapter2, dataSet11.Tables["Products"]);
}

public void DoUpdate(DbDataAdapter dataAdapter, System.Data.DataTable dataTable) {
try {
dataAdapter.Update(dataTable);
} catch(Exception ex) {
MessageBox.Show(ex.Message);
}
}