DataGridColumnCollection.CopyTo(Array, Int32) Method

Reference

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Important

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Copies the items from the DataGridColumnCollection collection to the specified Array, starting at the specified index in the 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 -> unit

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

Parameters

array: Array

A zero-based Array that receives the copied items from the DataGridColumnCollection.

index: Int32

The first position in the specified Array to receive the copied contents.

Implements

CopyTo(Array, Int32)

Exceptions

ArgumentNullException

array is null.

Examples

The following code example demonstrates how to use the CopyTo method to copy the contents of the DataGridColumnCollection collection to an array of DataGridColumn objects.

<%@ 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>

Remarks

Use this method to copy the contents of the DataGridColumnCollection collection into the specified System.Array, starting at the specified index.

Note

The array parameter must be a zero-based System.Array.

Applies to

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