DataGridColumnCollection.CopyTo(Array, Int32) 方法
定義
重要
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從 DataGridColumnCollection 中指定的索引處開始，將項目從 Array 集合複製到指定的 Array。
public:
virtual void CopyTo(Array ^ array, int index);public void CopyTo (Array array, int index);abstract member CopyTo : Array * int -> unit
override this.CopyTo : Array * int -> unitPublic Sub CopyTo (array As Array, index As Integer)參數
- array
- Array
從 DataGridColumnCollection 接收複製項目的以零為起始的 Array。
實作
例外狀況
array 為 null。
範例
下列程式碼範例示範如何使用 CopyTo 方法，將集合的內容 DataGridColumnCollection 複製到 物件的陣列 DataGridColumn 。
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<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)
{
DataGridColumn[] myArray = new DataGridColumn[3];
ItemsGrid.Columns.CopyTo(myArray, 0);
Label1.Text = "The heading text for the items in the array are: <br /><br />";
foreach (DataGridColumn column in myArray)
{
Label1.Text += column.HeaderText + "<br />";
}
}
</script>
<head runat="server">
<title>DataGridColumnCollection CopyTo Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGridColumnCollection CopyTo Example</h3>
<b>Product List</b>
<asp:DataGrid id="ItemsGrid"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
AutoGenerateColumns="false"
runat="server">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<Columns>
<asp:BoundColumn
HeaderText="Item Number"
DataField="IntegerValue"/>
<asp:BoundColumn
HeaderText="Item"
DataField="StringValue"/>
<asp:BoundColumn
HeaderText="Price"
DataField="CurrencyValue"
DataFormatString="{0:c}">
<ItemStyle HorizontalAlign="right">
</ItemStyle>
</asp:BoundColumn>
</Columns>
</asp:DataGrid>
<br />
<asp:Button id="Button1"
Text="Copy DataGridColumnsCollection to Array"
OnClick="Button_Click"
runat="server"/>
<br />
<asp:Label id="Label1"
runat="server"/>
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script language="VB" runat="server">
Function CreateDataSource() As ICollection
Dim dt As New DataTable()
Dim dr As DataRow
dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
Dim i As Integer
For i = 0 To 8
dr = dt.NewRow()
dr(0) = i
dr(1) = "Item " & i.ToString()
dr(2) = 1.23 *(i + 1)
dt.Rows.Add(dr)
Next i
Dim dv As New DataView(dt)
Return dv
End Function 'CreateDataSource
Sub Page_Load(sender As Object, e As EventArgs)
If Not IsPostBack Then
' Load this data only once.
ItemsGrid.DataSource = CreateDataSource()
ItemsGrid.DataBind()
End If
End Sub 'Page_Load
Sub Button_Click(sender As Object, e As EventArgs)
Dim myArray(3) As DataGridColumn
ItemsGrid.Columns.CopyTo(myArray, 0)
Label1.Text = "The heading text for the items in the array are: " & "<br />" & "<br />"
Dim column As DataGridColumn
For Each column In myArray
Label1.Text &= column.HeaderText & "<br />"
Next column
End Sub 'Button_Click
</script>
<head runat="server">
<title>DataGridColumnCollection CopyTo Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGridColumnCollection CopyTo Example</h3>
<b>Product List</b>
<asp:DataGrid id="ItemsGrid"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
AutoGenerateColumns="false"
runat="server">
<HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<Columns>
<asp:BoundColumn
HeaderText="Item Number"
DataField="IntegerValue"/>
<asp:BoundColumn
HeaderText="Item"
DataField="StringValue"/>
<asp:BoundColumn
HeaderText="Price"
DataField="CurrencyValue"
DataFormatString="{0:c}">
<ItemStyle HorizontalAlign="right">
</ItemStyle>
</asp:BoundColumn>
</Columns>
</asp:DataGrid>
<br />
<asp:Button id="Button1"
Text="Copy DataGridColumnsCollection to Array"
OnClick="Button_Click"
runat="server"/>
<br />
<asp:Label id="Label1"
runat="server"/>
</form>
</body>
</html>
備註
使用這個方法，從指定的索引開始，將集合的內容 DataGridColumnCollection 複製到指定的 System.Array 。
注意
參數 array 必須是以零起始 System.Array 的 。
