DataGridItemEventHandler 代理人

參考

定義

命名空間:: System.Web.UI.WebControls

組件:: System.Web.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

表示處理 ItemCreated 控制項之 ItemDataBound 和 DataGrid 事件的方法。

public delegate void DataGridItemEventHandler(System::Object ^ sender, DataGridItemEventArgs ^ e);

public delegate void DataGridItemEventHandler(object sender, DataGridItemEventArgs e);

type DataGridItemEventHandler = delegate of obj * DataGridItemEventArgs -> unit

Public Delegate Sub DataGridItemEventHandler(sender As Object, e As DataGridItemEventArgs)

參數

sender: Object

事件的來源。

e: DataGridItemEventArgs

DataGridItemEventArgs，其中包含事件資料。

範例

下列程式碼範例示範如何指定和撰寫事件處理常式 ItemCreated 的程式碼，以顯示控制項中 DataGrid 建立專案的順序。

<%@ 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">
 
   DataTable Cart;
   DataView CartView;
 
   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 < 10; 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) 
      {
         // Need to load this data only once.
         ItemsGrid.DataSource = CreateDataSource();
         ItemsGrid.DataBind();
      }
 
   }
 
   void Item_Created(Object sender, DataGridItemEventArgs e) 
   {
 
      Label1.Text = Label1.Text + " " + e.Item.ItemIndex;
 
   }
 
</script>
 
<head runat="server">
    <title>DataGridItemEventArgs Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataGridItemEventArgs Example</h3>
 
      <asp:DataGrid id="ItemsGrid" runat="server"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           ShowFooter="true"
           OnItemCreated="Item_Created"
           AutoGenerateColumns="true">

         <HeaderStyle BackColor="#00aaaa">
         </HeaderStyle>

         <FooterStyle BackColor="#00aaaa">
         </FooterStyle>
   
      </asp:DataGrid>
 
      <br />
 
      <asp:Label id="Label1" 
           Text="Order of items created: " 
           runat="server"/>

      <br />

      <asp:Label id="Label2" 
           Text="Note: The -1's refer to the header and footer." 
           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">
 
    Dim Cart As DataTable
    Dim CartView As DataView
 
    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 9
            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
            ' Need to load this data only once.
            ItemsGrid.DataSource = CreateDataSource()
            ItemsGrid.DataBind()
        End If
    End Sub 'Page_Load
     

    Sub Item_Created(sender As Object, e As DataGridItemEventArgs)
        
        Label1.Text = Label1.Text & " " & e.Item.ItemIndex
    End Sub 'Item_Created 
 
</script>
 
<head runat="server">
    <title>DataGridItemEventArgs Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataGridItemEventArgs Example</h3>
 
      <asp:DataGrid id="ItemsGrid" runat="server"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           ShowFooter="true"
           OnItemCreated="Item_Created"
           AutoGenerateColumns="true">

         <HeaderStyle BackColor="#00aaaa">
         </HeaderStyle>

         <FooterStyle BackColor="#00aaaa">
         </FooterStyle>
   
      </asp:DataGrid>
 
      <br />
 
      <asp:Label id="Label1" 
           Text="Order of items created: " 
           runat="server"/>

      <br />

      <asp:Label id="Label2" 
           Text="Note: The -1's refer to the header and footer." 
           runat="server"/>
 
   </form>
 
</body>
</html>


<%@ Page Language="C#" AutoEventWireup="True" Debug="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 runat="server">
 
      ICollection CreateDataSource()
      {

         // Create sample data for the DataGrid control.
         DataTable dt = new DataTable();
         DataRow dr;
 
         // Define the columns of the table.
         dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
         dt.Columns.Add(new DataColumn("StringValue", typeof(String)));
         dt.Columns.Add(new DataColumn("CurrencyValue", typeof(Double)));
 
         // Populate the table with sample values.
         for (int i=0; i<=10; 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)
      { 
 
         // Load sample data only once, when the page is first loaded.
         if (!IsPostBack)
         { 
         
            ItemsGrid.DataSource = CreateDataSource();
            ItemsGrid.DataBind();
         
         }

      }
 
      void Item_Bound(Object sender, DataGridItemEventArgs e) 
      {
 
         // Use the ItemDataBound event to customize the DataGrid control. 
         // The ItemDataBound event allows you to access the data before 
         // the item is displayed in the control. In this example, the 
         // ItemDataBound event is used to format the items in the 
         // CurrencyColumn in currency format.
         if((e.Item.ItemType == ListItemType.Item) || 
             (e.Item.ItemType == ListItemType.AlternatingItem))
         {
 
            // Retrieve the text of the CurrencyColumn from the DataGridItem
            // and convert the value to a Double.
            Double Price = Convert.ToDouble(e.Item.Cells[2].Text);

            // Format the value as currency and redisplay it in the DataGrid.
            e.Item.Cells[2].Text = Price.ToString("c");
        
         }         
 
      }
 
</script>
 
<head runat="server">
    <title>DataGrid ItemDataBound Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataGrid ItemDataBound Example</h3>
 
      <asp:DataGrid id="ItemsGrid" runat="server"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           ShowFooter="true"
           OnItemDataBound="Item_Bound">

         <HeaderStyle BackColor="#00aaaa">
         </HeaderStyle>

         <FooterStyle BackColor="#00aaaa">
         </FooterStyle>
   
      </asp:DataGrid>

   </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 runat="server">
 
      Function CreateDataSource() As ICollection

         ' Create sample data for the DataGrid control.
         Dim dt As DataTable = New DataTable()
         Dim dr As DataRow 
 
         ' Define the columns of the table.
         dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
         dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
         dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
 
         ' Populate the table with sample values.
         Dim i As Integer         

         For i=0 To 10 

            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 DataView = New DataView(dt)

         return dv
      
      End Function
 
      Sub Page_Load(sender As Object, e As EventArgs)
 
         ' Load sample data only once, when the page is first loaded.
         If Not IsPostBack Then
         
            ItemsGrid.DataSource = CreateDataSource()
            ItemsGrid.DataBind()
         
         End If

      End Sub
 
      Sub Item_Bound(sender As Object, e As DataGridItemEventArgs) 
 
         ' Use the ItemDataBound event to customize the DataGrid control. 
         ' The ItemDataBound event allows you to access the data before 
         ' the item is displayed in the control. In this example, the 
         ' ItemDataBound event is used to format the items in the 
         ' CurrencyColumn in currency format.
         If e.Item.ItemType = ListItemType.Item Or _
             e.Item.ItemType = ListItemType.AlternatingItem Then
 
            ' Retrieve the text of the CurrencyColumn from the DataGridItem
            ' and convert the value to a Double.
            Dim Price As Double = Convert.ToDouble(e.Item.Cells(2).Text)

            ' Format the value as currency and redisplay it in the DataGrid.
            e.Item.Cells(2).Text = Price.ToString("c")
        
         End If         
 
      End Sub
 
</script>
 
<head runat="server">
    <title>DataGrid ItemDataBound Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataGrid ItemDataBound Example</h3>
 
      <asp:DataGrid id="ItemsGrid" runat="server"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           ShowFooter="true"
           OnItemDataBound="Item_Bound">

         <HeaderStyle BackColor="#00aaaa">
         </HeaderStyle>

         <FooterStyle BackColor="#00aaaa">
         </FooterStyle>
   
      </asp:DataGrid>

   </form>
 
</body>
</html>


<%@ 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 runat="server">
 
      ICollection CreateDataSource()
      {

         // Create sample data for the DataGrid control.
         DataTable dt = new DataTable();
         DataRow dr;
 
         // Define the columns of the table.
         dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
         dt.Columns.Add(new DataColumn("StringValue", typeof(String)));
         dt.Columns.Add(new DataColumn("CurrencyValue", typeof(Double)));
 
         // Populate the table with sample values.
         for (int i=0; i<=10; 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)
      { 
 
         // Manually register the event-handling method for the  
         // ItemDataBound event of the DataGrid control.
         ItemsGrid.ItemDataBound += 
             new DataGridItemEventHandler(this.Item_Bound);

         // Load sample data only once, when the page is first loaded.
         if (!IsPostBack)
         { 
         
            ItemsGrid.DataSource = CreateDataSource();
            ItemsGrid.DataBind();
         
         }

      }
 
      void Item_Bound(Object sender, DataGridItemEventArgs e) 
      {
 
         // Use the ItemDataBound event to customize the DataGrid control. 
         // The ItemDataBound event allows you to access the data before 
         // the item is displayed in the control. In this example, the 
         // ItemDataBound event is used to format the items in the 
         // CurrencyColumn in currency format.
         if((e.Item.ItemType == ListItemType.Item) ||
             (e.Item.ItemType == ListItemType.AlternatingItem))
         {
 
            // Retrieve the text of the CurrencyColumn from the DataGridItem
            // and convert the value to a Double.
            Double Price = Convert.ToDouble(e.Item.Cells[2].Text);

            // Format the value as currency and redisplay it in the DataGrid.
            e.Item.Cells[2].Text = Price.ToString("c");
        
         }         
 
      }
 
</script>
 
<head runat="server">
    <title>DataGrid ItemDataBound Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataGrid ItemDataBound Example</h3>
 
      <asp:DataGrid id="ItemsGrid" runat="server"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           ShowFooter="true">

         <HeaderStyle BackColor="#00aaaa">
         </HeaderStyle>

         <FooterStyle BackColor="#00aaaa">
         </FooterStyle>
   
      </asp:DataGrid>

   </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 runat="server">
 
      Function CreateDataSource() As ICollection

         ' Create sample data for the DataGrid control.
         Dim dt As DataTable = New DataTable()
         Dim dr As DataRow 
 
         ' Define the columns of the table.
         dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
         dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
         dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
 
         ' Populate the table with sample values.
         Dim i As Integer         

         For i=0 To 10 

            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 DataView = New DataView(dt)

         return dv
      
      End Function
 
      Sub Page_Load(sender As Object, e As EventArgs)

         ' Manually register the event-handling method for the  
         ' ItemDataBound event of the DataGrid control.
         AddHandler ItemsGrid.ItemDataBound, AddressOf Item_Bound
 
         ' Load sample data only once, when the page is first loaded.
         If Not IsPostBack Then
         
            ItemsGrid.DataSource = CreateDataSource()
            ItemsGrid.DataBind()
         
         End If

      End Sub
 
      Sub Item_Bound(sender As Object, e As DataGridItemEventArgs) 
 
         ' Use the ItemDataBound event to customize the DataGrid control. 
         ' The ItemDataBound event allows you to access the data before 
         ' the item is displayed in the control. In this example, the 
         ' ItemDataBound event is used to format the items in the 
         ' CurrencyColumn in currency format.
         If e.Item.ItemType = ListItemType.Item Or _
             e.Item.ItemType = ListItemType.AlternatingItem Then
 
            ' Retrieve the text of the CurrencyColumn from the DataGridItem
            ' and convert the value to a Double.
            Dim Price As Double = Convert.ToDouble(e.Item.Cells(2).Text)

            ' Format the value as currency and redisplay it in the DataGrid.
            e.Item.Cells(2).Text = Price.ToString("c")
        
         End If         
 
      End Sub
 
</script>
 
<head runat="server">
    <title>DataGrid ItemDataBound Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataGrid ItemDataBound Example</h3>
 
      <asp:DataGrid id="ItemsGrid" runat="server"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           ShowFooter="true">

         <HeaderStyle BackColor="#00aaaa">
         </HeaderStyle>

         <FooterStyle BackColor="#00aaaa">
         </FooterStyle>
   
      </asp:DataGrid>

   </form>
 
</body>
</html>

備註

建立 ItemCreated 控制項中的 DataGrid 專案時，就會引發事件。

ItemDataBound當控制項中的 DataGrid 專案系結至資料來源時，就會引發事件。

建立 DataGridItemEventHandler 委派時，必須識別處理事件的方法。若要使事件與您的事件處理常式產生關聯，請將委派的執行個體 (Instance) 加入至事件。除非您移除委派，否則每當事件發生時就會呼叫事件處理常式。如需事件處理常式委派的詳細資訊，請參閱處理和引發事件。

擴充方法

GetMethodInfo(Delegate)

取得表示特定委派所代表之方法的物件。

適用於

DataGridItemEventHandler 代理人

定義

參數

範例

備註

擴充方法

適用於

另請參閱

意見反應

其他資源