DevExpress使用教程：添加非綁定列

在本示例中，假設 XtraGrid 網(wǎng)格已被綁定到NWIND數(shù)據(jù)庫的[Order Details]表中。grid 網(wǎng)格中包含 "Quantity", "UnitPrice" 和 "Discount" 列，并且這幾列已被綁定到數(shù)據(jù)庫表的相應字段中。下面的例子主要演示如何為gird網(wǎng)格添加一個非綁定列，從而顯示根據(jù) Quantity*UnitPrice*(1-Discount)公式計算出來的每個訂單的金額。

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代碼如下：

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);
}

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