DevExpress XtraGrid数据绑定示例一：添加非绑定列

在本示例中，假设XtraGrid网格已被绑定到NWIND数据库的[Order Details]表中。grid 网格中包含 "Quantity", "UnitPrice" 和 "Discount" 列，并且这几列已被绑定到数据库表的相应字段中。下面的例子主要演示如何为gird网格添加一个非绑定列，从而显示根据Quantity*UnitPrice*(1-Discount)公式计算出来的每个订单的金额。

代码如下：

C#

using DevExpress.XtraGrid.Views.Base;using DevExpress.XtraGrid.Columns;private void Form1_Load(object sender, System.EventArgs e) {// ...gridControl1.ForceInitialize();// Create an unbound column.GridColumn unbColumn = gridView1.Columns.AddField("Total");unbColumn.VisibleIndex = gridView1.Columns.Count;unbColumn.UnboundType = DevExpress.Data.UnboundColumnType.Decimal;// Disable editing.unbColumn.OptionsColumn.AllowEdit = false;// Specify format settings.unbColumn.DisplayFormat.FormatType = DevExpress.Utils.FormatType.Numeric;unbColumn.DisplayFormat.FormatString = "c";// Customize the appearance settings.unbColumn.AppearanceCell.BackColor = Color.LemonChiffon;}// Returns the total amount for a specific row.decimal getTotalValue(int listSourceRowIndex) {DataRow row = nwindDataSet.Tables["Order Details"].Rows[listSourceRowIndex];decimal unitPrice = Convert.ToDecimal(row["UnitPrice"]);decimal quantity = Convert.ToDecimal(row["Quantity"]);decimal discount = Convert.ToDecimal(row["Discount"]);return unitPrice * quantity * (1 - discount);}// Provides data for the Total column.private void gridView1_CustomUnboundColumnData(object sender, CustomColumnDataEventArgs e) {if (e.Column.FieldName == "Total" && e.IsGetData) e.Value = getTotalValue(e.ListSourceRowIndex);}

VB

Imports DevExpress.XtraGrid.Views.BaseImports DevExpress.XtraGrid.ColumnsPrivate Sub Form1_Load(ByVal sender As System.Object, _ByVal e As System.EventArgs) Handles MyBase.Load' ...gridControl1.ForceInitialize()' Create an unbound column.Dim unbColumn As GridColumn = GridView1.Columns.AddField("Total")unbColumn.VisibleIndex = GridView1.Columns.CountunbColumn.UnboundType = DevExpress.Data.UnboundColumnType.Decimal' Disable editing.unbColumn.OptionsColumn.AllowEdit = False' Specify format settings.unbColumn.DisplayFormat.FormatType = DevExpress.Utils.FormatType.NumericunbColumn.DisplayFormat.FormatString = "c"' Customize the appearance settings.unbColumn.AppearanceCell.BackColor = Color.LemonChiffonEnd Sub' Returns the total amount for a specific row.Private Function getTotalValue(ByVal listSourceRowIndex As Integer) As DecimalDim row As DataRow = NwindDataSet.Tables("Order Details").Rows(listSourceRowIndex)Dim unitPrice As Decimal = Convert.ToDecimal(row("UnitPrice"))Dim quantity As Decimal = Convert.ToDecimal(row("Quantity"))Dim discount As Decimal = Convert.ToDecimal(row("Discount"))Return unitPrice * quantity * (1 - discount)End Function' Provides data for the Total column.Private Sub GridView1_CustomUnboundColumnData(ByVal sender As Object, _ByVal e As CustomColumnDataEventArgs) Handles GridView1.CustomUnboundColumnDataIf e.Column.FieldName = "Total" And e.IsGetData Then e.Value = _getTotalValue(e.ListSourceRowIndex)End Sub

结果显示如下：