DataGridColumnCollection.CopyTo(Array, Int32) 方法

参考

定义

命名空间:: System.Web.UI.WebControls

程序集:: System.Web.dll

重要

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将 DataGridColumnCollection 集合中的项复制到指定的 Array，从 Array 中的指定索引处开始。

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 -> unit

Public Sub CopyTo (array As Array, index As Integer)

参数

array: Array

一个从零开始的 Array，它接收 DataGridColumnCollection 的复制项。

index: Int32

指定的 Array 中接收复制内容的第一个位置。

实现

CopyTo(Array, Int32)

例外

ArgumentNullException

array 为 null。

示例

下面的代码示例演示如何使用 CopyTo 方法将集合的内容 DataGridColumnCollection 复制到对象的数组 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>

注解

使用此方法将集合的内容 DataGridColumnCollection 复制到指定的中，从指定的 System.Array索引处开始。

备注

参数 array 必须是从零开始的 System.Array。

适用于

另请参阅

Array

DataGridColumnCollection.CopyTo(Array, Int32) 方法

定义

参数

实现

例外

示例

注解

适用于

另请参阅

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