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.Base
Imports DevExpress.XtraGrid.Columns
Private 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.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
End Sub
' Returns the total amount for a specific row.
Private Function getTotalValue(ByVal listSourceRowIndex As Integer) As Decimal
Dim 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.CustomUnboundColumnData
If e.Column.FieldName = "Total" And e.IsGetData Then e.Value = _
getTotalValue(e.ListSourceRowIndex)
End Sub

结果显示如下：