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DataList.ItemCommand Evento

Definición

Se produce cuando se hace clic en cualquier botón del control DataList.

public:
 event System::Web::UI::WebControls::DataListCommandEventHandler ^ ItemCommand;
public event System.Web.UI.WebControls.DataListCommandEventHandler ItemCommand;
member this.ItemCommand : System.Web.UI.WebControls.DataListCommandEventHandler 
Public Custom Event ItemCommand As DataListCommandEventHandler 

Tipo de evento

Ejemplos

En el ejemplo de código siguiente se muestra cómo especificar y codificar un controlador para que el ItemCommand evento seleccione un elemento del DataList control .

Nota

En el ejemplo de código siguiente se usa el modelo de código de un solo archivo y es posible que no funcione correctamente si se copia directamente en un archivo de código subyacente. Este ejemplo de código debe copiarse en un archivo de texto vacío que tenga una extensión .aspx. Para obtener más información sobre el modelo de código de formularios Web Forms, vea ASP.NET modelo de código de página de formularios web Forms.


<%@ 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" >
<head>
    <title>DataList Select Example</title>
<script runat="server">

      ICollection CreateDataSource() 
      {
      
         // Create sample data for the DataList control.
         DataTable dt = new DataTable();
         DataRow dr;
 
         // Define the columns of the table.
         dt.Columns.Add(new DataColumn("Item", typeof(Int32)));
         dt.Columns.Add(new DataColumn("Qty", typeof(Int32)));
         dt.Columns.Add(new DataColumn("Price", typeof(double)));
 
         // Populate the table with sample values.
         for (int i = 0; i < 9; i++) 
         {
            dr = dt.NewRow();
 
            dr[0] = i;
            dr[1] = i * 2;
            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) 
         {
            ItemsList.DataSource = CreateDataSource();
            ItemsList.DataBind();
         }

      }

      void Item_Command(Object sender, DataListCommandEventArgs e) 
      {
        
         // Set the SelectedIndex property to select an item in the DataList.
         ItemsList.SelectedIndex = e.Item.ItemIndex;

         // Rebind the data source to the DataList to refresh the control.
         ItemsList.DataSource = CreateDataSource();
         ItemsList.DataBind();

      }

   </script>

</head>
<body>

   <form id="form1" runat="server">

      <h3>DataList Select Example</h3>

      Click <b>Select</b> to select an item.

      <br /><br />
       
      <asp:DataList id="ItemsList"
           GridLines="Both"
           CellPadding="3"
           CellSpacing="0"           
           OnItemCommand="Item_Command"
           runat="server">

         <HeaderStyle BackColor="#aaaadd">
         </HeaderStyle>

         <AlternatingItemStyle BackColor="Gainsboro">
         </AlternatingItemStyle>

         <SelectedItemStyle BackColor="Yellow">
         </SelectedItemStyle>

         <HeaderTemplate>

            Items

         </HeaderTemplate>
         
         <ItemTemplate>

            <asp:LinkButton id="SelectButton" 
                 Text="Select" 
                 CommandName="Select"
                 runat="server"/>

            Item <%# DataBinder.Eval(Container.DataItem, "Item") %>

         </ItemTemplate>
              
         <SelectedItemTemplate>

            Item:
            <asp:Label id="ItemLabel" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Item") %>' 
                 runat="server"/>

            <br />

            Quantity:
            <asp:Label id="QtyLabel" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Qty") %>' 
                 runat="server"/>

            <br />

            Price:
            <asp:Label id="PriceLabel" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Price", "{0:c}") %>' 
                 runat="server"/>

         </SelectedItemTemplate>

      </asp:DataList>

   </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" >
<head>
    <title>DataList Select Example</title>
<script runat="server">

      Function CreateDataSource() As ICollection 
      
         ' Create sample data for the DataList control.
         Dim dt As DataTable = New DataTable()
         Dim dr As DataRow
 
         ' Define the columns of the table.
         dt.Columns.Add(New DataColumn("Item", GetType(Int32)))
         dt.Columns.Add(New DataColumn("Qty", GetType(Int32)))
         dt.Columns.Add(New DataColumn("Price", GetType(Double)))
 
         ' Populate the table with sample values.
         Dim i As Integer

         For i = 0 To 8 

            dr = dt.NewRow()
 
            dr(0) = i
            dr(1) = i * 2
            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 
         
            ItemsList.DataSource = CreateDataSource()
            ItemsList.DataBind()
         
         End If

      End Sub

      Sub Item_Command(sender As Object, e As DataListCommandEventArgs) 
        
         ' Set the SelectedIndex property to select an item in the DataList.
         ItemsList.SelectedIndex = e.Item.ItemIndex

         ' Rebind the data source to the DataList to refresh the control.
         ItemsList.DataSource = CreateDataSource()
         ItemsList.DataBind()

      End Sub

   </script>

</head>
<body>

   <form id="form1" runat="server">

      <h3>DataList Select Example</h3>

      Click <b>Select</b> to select an item.

      <br /><br />
       
      <asp:DataList id="ItemsList"
           GridLines="Both"
           CellPadding="3"
           CellSpacing="0"           
           OnItemCommand="Item_Command"
           runat="server">

         <HeaderStyle BackColor="#aaaadd">
         </HeaderStyle>

         <AlternatingItemStyle BackColor="Gainsboro">
         </AlternatingItemStyle>

         <SelectedItemStyle BackColor="Yellow">
         </SelectedItemStyle>

         <HeaderTemplate>

            Items

         </HeaderTemplate>
         
         <ItemTemplate>

            <asp:LinkButton id="SelectButton" 
                 Text="Select" 
                 CommandName="Select"
                 runat="server"/>

            Item <%# DataBinder.Eval(Container.DataItem, "Item") %>

         </ItemTemplate>
              
         <SelectedItemTemplate>

            Item:
            <asp:Label id="ItemLabel" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Item") %>' 
                 runat="server"/>

            <br />

            Quantity:
            <asp:Label id="QtyLabel" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Qty") %>' 
                 runat="server"/>

            <br />

            Price:
            <asp:Label id="PriceLabel" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Price", "{0:c}") %>' 
                 runat="server"/>

         </SelectedItemTemplate>

      </asp:DataList>

   </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" >
<head>
    <title>DataList Select Example</title>
<script runat="server">

      ICollection CreateDataSource() 
      {
      
         // Create sample data for the DataList control.
         DataTable dt = new DataTable();
         DataRow dr;
 
         // Define the columns of the table.
         dt.Columns.Add(new DataColumn("Item", typeof(Int32)));
         dt.Columns.Add(new DataColumn("Qty", typeof(Int32)));
         dt.Columns.Add(new DataColumn("Price", typeof(double)));
 
         // Populate the table with sample values.
         for (int i = 0; i < 9; i++) 
         {
            dr = dt.NewRow();
 
            dr[0] = i;
            dr[1] = i * 2;
            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) 
         {
            ItemsList.DataSource = CreateDataSource();
            ItemsList.DataBind();
         }

         // Manually register the event-handling method for the 
         // ItemCommand event.
         ItemsList.ItemCommand += 
             new DataListCommandEventHandler(this.Item_Command);

      }

      void Item_Command(Object sender, DataListCommandEventArgs e) 
      {
        
         // Set the SelectedIndex property to select an item in the DataList.
         ItemsList.SelectedIndex = e.Item.ItemIndex;

         // Rebind the data source to the DataList to refresh the control.
         ItemsList.DataSource = CreateDataSource();
         ItemsList.DataBind();

      }

   </script>

</head>
<body>

   <form id="form1" runat="server">

      <h3>DataList Select Example</h3>

      Click <b>Select</b> to select an item.

      <br /><br />
       
      <asp:DataList id="ItemsList"
           GridLines="Both"
           CellPadding="3"
           CellSpacing="0"           
           runat="server">

         <HeaderStyle BackColor="#aaaadd">
         </HeaderStyle>

         <AlternatingItemStyle BackColor="Gainsboro">
         </AlternatingItemStyle>

         <SelectedItemStyle BackColor="Yellow">
         </SelectedItemStyle>

         <HeaderTemplate>

            Items

         </HeaderTemplate>
         
         <ItemTemplate>

            <asp:LinkButton id="SelectButton" 
                 Text="Select" 
                 CommandName="Select"
                 runat="server"/>

            Item <%# DataBinder.Eval(Container.DataItem, "Item") %>

         </ItemTemplate>
              
         <SelectedItemTemplate>

            Item:
            <asp:Label id="ItemLabel" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Item") %>' 
                 runat="server"/>

            <br />

            Quantity:
            <asp:Label id="QtyLabel" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Qty") %>' 
                 runat="server"/>

            <br />

            Price:
            <asp:Label id="PriceLabel" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Price", "{0:c}") %>' 
                 runat="server"/>

         </SelectedItemTemplate>

      </asp:DataList>

   </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" >
<head>
    <title>DataList Select Example</title>
<script runat="server">

      Function CreateDataSource() As ICollection 
      
         ' Create sample data for the DataList control.
         Dim dt As DataTable = New DataTable()
         Dim dr As DataRow
 
         ' Define the columns of the table.
         dt.Columns.Add(New DataColumn("Item", GetType(Int32)))
         dt.Columns.Add(New DataColumn("Qty", GetType(Int32)))
         dt.Columns.Add(New DataColumn("Price", GetType(Double)))
 
         ' Populate the table with sample values.
         Dim i As Integer

         For i = 0 To 8 

            dr = dt.NewRow()
 
            dr(0) = i
            dr(1) = i * 2
            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 
         
            ItemsList.DataSource = CreateDataSource()
            ItemsList.DataBind()
         
         End If

         ' Manually register the event-handling method for the 
         ' ItemCommand event.
         AddHandler ItemsList.ItemCommand, AddressOf Item_Command

      End Sub

      Sub Item_Command(sender As Object, e As DataListCommandEventArgs) 
        
         ' Set the SelectedIndex property to select an item in the DataList.
         ItemsList.SelectedIndex = e.Item.ItemIndex

         ' Rebind the data source to the DataList to refresh the control.
         ItemsList.DataSource = CreateDataSource()
         ItemsList.DataBind()

      End Sub

   </script>

</head>
<body>

   <form id="form1" runat="server">

      <h3>DataList Select Example</h3>

      Click <b>Select</b> to select an item.

      <br /><br />
       
      <asp:DataList id="ItemsList"
           GridLines="Both"
           CellPadding="3"
           CellSpacing="0"           
           OnItemCommand="Item_Command"
           runat="server">

         <HeaderStyle BackColor="#aaaadd">
         </HeaderStyle>

         <AlternatingItemStyle BackColor="Gainsboro">
         </AlternatingItemStyle>

         <SelectedItemStyle BackColor="Yellow">
         </SelectedItemStyle>

         <HeaderTemplate>

            Items

         </HeaderTemplate>
         
         <ItemTemplate>

            <asp:LinkButton id="SelectButton" 
                 Text="Select" 
                 CommandName="Select"
                 runat="server"/>

            Item <%# DataBinder.Eval(Container.DataItem, "Item") %>

         </ItemTemplate>
              
         <SelectedItemTemplate>

            Item:
            <asp:Label id="ItemLabel" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Item") %>' 
                 runat="server"/>

            <br />

            Quantity:
            <asp:Label id="QtyLabel" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Qty") %>' 
                 runat="server"/>

            <br />

            Price:
            <asp:Label id="PriceLabel" 
                 Text='<%# DataBinder.Eval(Container.DataItem, "Price", "{0:c}") %>' 
                 runat="server"/>

         </SelectedItemTemplate>

      </asp:DataList>

   </form>

</body>
</html>

Comentarios

El ItemCommand evento se genera cuando se hace clic en cualquier botón en el DataList control y se usa normalmente cuando se tiene un control de botón con un valor personalizado CommandName .

Para obtener más información sobre el control de eventos, vea Cómo: Consumir eventos en una aplicación de formularios Web Forms.

Se aplica a

Consulte también