DataGrid.OnItemCreated(DataGridItemEventArgs) DataGrid.OnItemCreated(DataGridItemEventArgs) DataGrid.OnItemCreated(DataGridItemEventArgs) DataGrid.OnItemCreated(DataGridItemEventArgs) Method

Definizione

Genera l'evento ItemCreated.Raises the ItemCreated event. In tal modo è possibile fornire un gestore personalizzato per l'evento.This allows you to provide a custom handler for the event.

protected:
 virtual void OnItemCreated(System::Web::UI::WebControls::DataGridItemEventArgs ^ e);
protected virtual void OnItemCreated (System.Web.UI.WebControls.DataGridItemEventArgs e);
abstract member OnItemCreated : System.Web.UI.WebControls.DataGridItemEventArgs -> unit
override this.OnItemCreated : System.Web.UI.WebControls.DataGridItemEventArgs -> unit
Protected Overridable Sub OnItemCreated (e As DataGridItemEventArgs)

Parametri

Esempi

Nell'esempio di codice seguente viene illustrato come specificare e scrivere il codice di ItemCreated un gestore per l'evento per visualizzare l'ordine DataGrid in cui gli elementi vengono creati nel controllo.The following code example demonstrates how to specify and code a handler for the ItemCreated event to display the order that items are created in the DataGrid control.

<%@ 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>DataGrid ItemCreated Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataGrid ItemCreated 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>DataGrid ItemCreated Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataGrid ItemCreated 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" %>
<%@ 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_Created(Object sender, DataGridItemEventArgs e) 
      {
 
         // Customize the footer section with an image.
         if(e.Item.ItemType == ListItemType.Footer)
         {         
 
           // Create an Image control.
           System.Web.UI.WebControls.Image NewImageControl = new System.Web.UI.WebControls.Image();

           // Set the properties of the Image control.
           NewImageControl.ImageUrl = "Image1.jpg"; 
           NewImageControl.AlternateText = "Image 1";
           
           // Add the Image control to the Controls collection of the 
           // cell representing the third column in the DataGrid.
           e.Item.Cells[2].Controls.Add(NewImageControl);

         }         
 
      }
 
</script>
 
<head runat="server">
    <title>DataGrid ItemCreated Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

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

         <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_Created(sender As Object, e As DataGridItemEventArgs) 
 
         ' Customize the footer section with an image.
         If e.Item.ItemType = ListItemType.Footer Then         
 
           ' Create an Image control.
           Dim NewImageControl As System.Web.UI.WebControls.Image = New System.Web.UI.WebControls.Image()

           ' Set the properties of the Image control.
           NewImageControl.ImageUrl = "Image1.jpg"
           NewImageControl.AlternateText = "Image 1"
           
           ' Add the Image control to the Controls collection of the 
           ' cell representing the third column in the DataGrid.
           e.Item.Cells(2).Controls.Add(NewImageControl)

         End If         
 
      End Sub
 
</script>
 
<head runat="server">
    <title>DataGrid ItemCreated Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

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

         <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 ItemCreated  
         // event of the DataGrid control.
         ItemsGrid.ItemCreated += 
             new DataGridItemEventHandler(this.Item_Created);

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

      }
 
      void Item_Created(Object sender, DataGridItemEventArgs e) 
      {
 
         // Customize the footer section with an image.
         if(e.Item.ItemType == ListItemType.Footer)
         {         
 
           // Create an Image control.
           System.Web.UI.WebControls.Image NewImageControl = new System.Web.UI.WebControls.Image();

           // Set the properties of the Image control.
           NewImageControl.ImageUrl = "Image1.jpg"; 
           NewImageControl.AlternateText = "Image 1";

           // Add the Image control to the Controls collection of the 
           // cell representing the third column in the DataGrid.
           e.Item.Cells[2].Controls.Add(NewImageControl);

         }         
 
      }
 
</script>
 
<head runat="server">
    <title>DataGrid ItemCreated Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataGrid ItemCreated 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 ItemCreated  
         ' event of the DataGrid control.
         AddHandler ItemsGrid.ItemCreated, AddressOf Item_Created
 
         ' 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_Created(sender As Object, e As DataGridItemEventArgs) 
 
         ' Customize the footer section with an image.
         If e.Item.ItemType = ListItemType.Footer Then         
 
           ' Create an Image control.
           Dim NewImageControl As System.Web.UI.WebControls.Image = New System.Web.UI.WebControls.Image()

           ' Set the properties of the Image control.
           NewImageControl.ImageUrl = "Image1.jpg"
           NewImageControl.AlternateText = "Image 1"

           ' Add the Image control to the Controls collection of the 
           ' cell representing the third column in the DataGrid.
           e.Item.Cells(2).Controls.Add(NewImageControl)

         End If         
 
      End Sub
 
</script>
 
<head runat="server">
    <title>DataGrid ItemCreated Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

      <h3>DataGrid ItemCreated 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>

Commenti

Usare il OnItemCreated metodo per fornire un gestore personalizzato per l' ItemCreated evento.Use the OnItemCreated method to provide a custom handler for the ItemCreated event.

L' ItemCreated evento viene generato quando viene creato un elemento DataGrid nel controllo, sia durante i round trip che nel momento in cui i dati vengono associati al controllo.The ItemCreated event is raised when an item in the DataGrid control is created, both during round-trips and at the time data is bound to the control.

L' ItemCreated evento viene comunemente usato per controllare il contenuto e l'aspetto di una riga DataGrid nel controllo.The ItemCreated event is commonly used to control the content and appearance of a row in the DataGrid control.

Quando viene generato un evento, il gestore dell'evento viene richiamato tramite un delegato.Raising an event invokes the event handler through a delegate. Per altre informazioni, vedere la gestione e generazione di eventi.For more information, see Handling and Raising Events.

Note per gli eredi

Quando si esegue OnItemCreated(DataGridItemEventArgs) l'override in una classe derivata, assicurarsi di chiamare il OnItemCreated(DataGridItemEventArgs) metodo della classe base.When overriding OnItemCreated(DataGridItemEventArgs) in a derived class, be sure to call the base class's OnItemCreated(DataGridItemEventArgs) method.

Per altre informazioni su come gestire gli eventi, vedere la gestione e generazione di eventi.For more information about how to handle events, see Handling and Raising Events.

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