下面的程式碼範例示範如何使用 GetEnumerator 方法來建立 System.Collections.IEnumerator 介面，該介面可被逐一查看以顯示 DataGridColumnCollection 集合的內容。
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<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<HTML>
<SCRIPT language=C# runat="server">
ICollection CreateDataSource()
{
DataTable dt = new DataTable();
DataRow dr;
dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));
for (int i = 0; i < 9; i++)
{
dr = dt.NewRow();
dr[0] = i;
dr[1] = "Item " + i.ToString();
dr[2] = 1.23 * (i + 1);
dt.Rows.Add(dr);
}
DataView dv = new DataView(dt);
return dv;
}
void Page_Load(Object sender, EventArgs e)
{
if (!IsPostBack)
{
// Load this data only once.
ItemsGrid.DataSource= CreateDataSource();
ItemsGrid.DataBind();
}
}
void Button_Click(Object sender, EventArgs e)
{
// Create IEnumerator for rows.
IEnumerator myEnum = ItemsGrid.Columns.GetEnumerator();
DataGridColumn column;
Label1.Text = "The header text of the items in the IEnumerator are: <br><br>";
// Iterate through IEnumerator and display its contents.
while (myEnum.MoveNext())
{
column = (DataGridColumn)myEnum.Current;
Label1.Text += column.HeaderText + "<br>";
}
}
</SCRIPT>
<FORM runat="server">
<H3>DataGridColumnCollection GetEnumerator Example</H3>
<B>Product List</B>
<ASP:DATAGRID id=ItemsGrid runat="server" AutoGenerateColumns="false" CellPadding="3" BorderWidth="1" BorderColor="black">
<HEADERSTYLE BackColor="#00aaaa">
</HEADERSTYLE>
<COLUMNS>
<ASP:BOUNDCOLUMN DataField="IntegerValue" HeaderText="Item Number" />
<ASP:BOUNDCOLUMN DataField="StringValue" HeaderText="Item" />
<ASP:BOUNDCOLUMN DataField="CurrencyValue" HeaderText="Price" DataFormatString="{0:c}">
<ITEMSTYLE HorizontalAlign="right">
</ITEMSTYLE>
</ASP:BOUNDCOLUMN>
</COLUMNS>
</ASP:DATAGRID>
<P>
<ASP:BUTTON id=Button1 onclick=Button_Click runat="server" Text="Create IEnumerator" />
<P>
<ASP:LABEL id=Label1 runat="server" />
</FORM>
