DetailsViewCommandEventHandler Délégué

  • Référence

Définition

Espace de noms:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Représente la méthode qui gère l'événement ItemCommand d'un contrôle DetailsView.

public delegate void DetailsViewCommandEventHandler(System::Object ^ sender, DetailsViewCommandEventArgs ^ e);
public delegate void DetailsViewCommandEventHandler(object sender, DetailsViewCommandEventArgs e);
type DetailsViewCommandEventHandler = delegate of obj * DetailsViewCommandEventArgs -> unit
Public Delegate Sub DetailsViewCommandEventHandler(sender As Object, e As DetailsViewCommandEventArgs)

Paramètres

sender
Object

Source de l'événement.

e
DetailsViewCommandEventArgs

DetailsViewCommandEventArgs qui contient les données d’événement.

Exemples

L’exemple de code suivant montre comment ajouter par programmation un DetailsViewCommandEventHandler délégué à l’événement ItemCommand d’un DetailsView contrôle. Cet exemple utilise le modèle de codage à fichier unique.


<%@ page language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  void Page_Load(Object sender, EventArgs e)
  {

    // Create a new DetailsView object.
    DetailsView customerDetailsView = new DetailsView();

    // Set the DetailsView object's properties.
    customerDetailsView.ID = "CustomerDetailsView";
    customerDetailsView.DataSourceID = "DetailsViewSource";
    customerDetailsView.AutoGenerateRows = true;
    customerDetailsView.AllowPaging = true;
    customerDetailsView.DataKeyNames = new String[1] { "CustomerID" };

    // Add a button field to the DetailsView control.
    ButtonField field = new ButtonField();
    field.ButtonType = ButtonType.Link;
    field.CausesValidation = false;
    field.Text = "Add to List";
    field.CommandName="Add";

    customerDetailsView.Fields.Add(field);

    // Programmatically register the event-handling method
    // for the ItemDeleting event of a DetailsView control.
    customerDetailsView.ItemCommand 
      += new DetailsViewCommandEventHandler( 
      this.CustomerDetailsView_ItemCommand);

    // Add the DetailsView object to the Controls collection
    // of the PlaceHolder control.
    DetailsViewPlaceHolder.Controls.Add(customerDetailsView);

  }
  
  void CustomerDetailsView_ItemCommand(Object sender, 
    DetailsViewCommandEventArgs e)
  {

    // Use the CommandName property to determine which button
    // was clicked. 
    if (e.CommandName == "Add")
    {
      // Get the DetailsView control that raised the event.
      DetailsView customerDetailsView = (DetailsView)e.CommandSource;

      // Add the current customer to the customer list. 

      // Get the row that contains the company name. In this
      // example, the company name is in the second row (index 1)  
      // of the DetailsView control.
      DetailsViewRow row = customerDetailsView.Rows[1];

      // Get the company's name from the appropriate cell.
      // In this example, the company name is in the second cell  
      // (index 1) of the row.
      String name = row.Cells[1].Text;

      // Create a ListItem object with the company name.
      ListItem item = new ListItem(name);

      // Add the ListItem object to the ListBox, if the 
      // item doesn't already exist.
      if (!CustomerListBox.Items.Contains(item))
      {
        CustomerListBox.Items.Add(item);
      }

    }

  }
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewCommandEventHandler Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>DetailsViewCommandEventHandler Example</h3>
      
      <!-- Use a PlaceHolder control as the container for the -->
      <!-- dynamically generated DetailsView control.         -->       
      <asp:placeholder id="DetailsViewPlaceHolder"
        runat="server"/>
      
      <br/><br/>
      
      Selected Customers:<br/>
      <asp:listbox id="CustomerListBox"
        runat="server"/>
      
      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the web.config file.                            -->
      <asp:sqldatasource id="DetailsViewSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], 
          [City], [PostalCode], [Country] From [Customers]"
        connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 

        runat="server"/>  
  
    </form>
  </body>
</html>


<%@ page language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

    ' Create a new DetailsView object.
    Dim customerDetailsView As New DetailsView()

    ' Set the DetailsView object's properties.
    customerDetailsView.ID = "CustomerDetailsView"
    customerDetailsView.DataSourceID = "DetailsViewSource"
    customerDetailsView.AutoGenerateRows = True
    customerDetailsView.AllowPaging = True
    
    Dim keyArray() As String = {"CustomerID"}
    customerDetailsView.DataKeyNames = keyArray
    
    ' Add a button field to the DetailsView control.
    Dim field As New ButtonField()
    field.ButtonType = ButtonType.Link
    field.CausesValidation = False
    field.Text = "Add to List"
    field.CommandName = "Add"

    customerDetailsView.Fields.Add(field)

    ' Programmatically register the event-handling method
    ' for the ItemDeleting event of a DetailsView control.
    AddHandler customerDetailsView.ItemCommand, _
      AddressOf CustomerDetailsView_ItemCommand

    ' Add the DetailsView object to the Controls collection
    ' of the PlaceHolder control.
    DetailsViewPlaceHolder.Controls.Add(customerDetailsView)

  End Sub
  
  Sub CustomerDetailsView_ItemCommand(ByVal sender As Object, _
    ByVal e As DetailsViewCommandEventArgs)

    ' Use the CommandName property to determine which button
    ' was clicked. 
    If e.CommandName = "Add" Then

      ' Get the DetailsView control that raised the event.
      Dim customerDetailsView As DetailsView = _
        CType(e.CommandSource, DetailsView)

      ' Add the current customer to the customer list. 

      ' Get the row that contains the company name. In this
      ' example, the company name is in the second row (index 1)  
      ' of the DetailsView control.
      Dim row As DetailsViewRow = customerDetailsView.Rows(1)

      ' Get the company's name from the appropriate cell.
      ' In this example, the company name is in the second cell  
      ' (index 1) of the row.
      Dim name As String = row.Cells(1).Text

      ' Create a ListItem object with the company name.
      Dim item As New ListItem(name)

      ' Add the ListItem object to the ListBox, if the 
      ' item doesn't already exist.
      If Not CustomerListBox.Items.Contains(item) Then
      
        CustomerListBox.Items.Add(item)
        
      End If

    End If

  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewCommandEventHandler Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>DetailsViewCommandEventHandler Example</h3>
      
      <!-- Use a PlaceHolder control as the container for the -->
      <!-- dynamically generated DetailsView control.         -->       
      <asp:placeholder id="DetailsViewPlaceHolder"
        runat="server"/>
      
      <br/><br/>
      
      Selected Customers:<br/>
      <asp:listbox id="CustomerListBox"
        runat="server"/>
      
      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the web.config file.                            -->
      <asp:sqldatasource id="DetailsViewSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], 
          [City], [PostalCode], [Country] From [Customers]"
        connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>  
  
    </form>
  </body>
</html>

L’exemple de code suivant montre une version de modèle de codage code-behind de l’exemple précédent. Pour que cet exemple fonctionne, vous devez copier le code ci-dessous dans le fichier code-behind associé.

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!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 runat="server">
    <title>DetailsViewCommandEventHandler Example</title>
</head>
<body>
    <form id="Form1" runat="server">
    
      <h3>DetailsViewCommandEventHandler Example</h3>
      
      <!-- Use a PlaceHolder control as the container for the -->
      <!-- dynamically generated DetailsView control.         -->       
      <asp:placeholder id="DetailsViewPlaceHolder"
        runat="server"/>
      
      <br/><br/>
      
      Selected Customers:<br/>
      <asp:listbox id="CustomerListBox"
        runat="server"/>
      
      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the web.config file.                            -->
      <asp:sqldatasource id="DetailsViewSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], 
          [City], [PostalCode], [Country] From [Customers]"
        connectionstring="
          <%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>  
  
    </form>
  </body>
</html>

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="DefaultVB.aspx.vb" Inherits="DefaultVB" %>

<!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 runat="server">
    <title>DetailsViewCommandEventHandler Example</title>
</head>
<body>
    <form id="Form1" runat="server">
    
      <h3>DetailsViewCommandEventHandler Example</h3>
      
      <!-- Use a PlaceHolder control as the container for the -->
      <!-- dynamically generated DetailsView control.         -->       
      <asp:placeholder id="DetailsViewPlaceHolder"
        runat="server"/>
      
      <br/><br/>
      
      Selected Customers:<br/>
      <asp:listbox id="CustomerListBox"
        runat="server"/>
      
      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the web.config file.                            -->
      <asp:sqldatasource id="DetailsViewSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>  
  
    </form>
  </body>
</html>

L’exemple de code suivant montre le fichier code-behind de l’exemple précédent.

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // Create a new DetailsView object.
        DetailsView customerDetailsView = new DetailsView();

        // Set the DetailsView object's properties.
        customerDetailsView.ID = "CustomerDetailsView";
        customerDetailsView.DataSourceID = "DetailsViewSource";
        customerDetailsView.AutoGenerateRows = true;
        customerDetailsView.AllowPaging = true;
        customerDetailsView.DataKeyNames = new String[1] { "CustomerID" };

        // Add a button field to the DetailsView control.
        ButtonField field = new ButtonField();
        field.ButtonType = ButtonType.Link;
        field.CausesValidation = false;
        field.Text = "Add to List";
        field.CommandName = "Add";

        customerDetailsView.Fields.Add(field);

        // Programmatically register the event-handling method
        // for the ItemDeleting event of a DetailsView control.
        customerDetailsView.ItemCommand += new DetailsViewCommandEventHandler(this.CustomerDetailsView_ItemCommand);

        // Add the DetailsView object to the Controls collection
        // of the PlaceHolder control.
        DetailsViewPlaceHolder.Controls.Add(customerDetailsView);
    }

    void CustomerDetailsView_ItemCommand(Object sender, DetailsViewCommandEventArgs e)
    {

        // Use the CommandName property to determine which button
        // was clicked. 
        if (e.CommandName == "Add")
        {
            // Get the DetailsView control that raised the event.
            DetailsView customerDetailsView = (DetailsView)sender;

            // Add the current customer to the customer list. 

            // Get the row that contains the company name. In this
            // example, the company name is in the second row (index 1)  
            // of the DetailsView control.
            DetailsViewRow row = customerDetailsView.Rows[1];

            // Get the company's name from the appropriate cell.
            // In this example, the company name is in the second cell  
            // (index 1) of the row.
            String name = row.Cells[1].Text;

            // Create a ListItem object with the company name.
            ListItem item = new ListItem(name);

            // Add the ListItem object to the ListBox, if the 
            // item doesn't already exist.
            if (!CustomerListBox.Items.Contains(item))
            {
                CustomerListBox.Items.Add(item);
            }
        }
    }
}

Partial Class DefaultVB
    Inherits System.Web.UI.Page

    Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load

        ' Create a new DetailsView object.
        Dim customerDetailsView As New DetailsView()

        ' Set the DetailsView object's properties.
        customerDetailsView.ID = "CustomerDetailsView"
        customerDetailsView.DataSourceID = "DetailsViewSource"
        customerDetailsView.AutoGenerateRows = True
        customerDetailsView.AllowPaging = True

        Dim keyArray() As String = {"CustomerID"}
        customerDetailsView.DataKeyNames = keyArray

        ' Add a button field to the DetailsView control.
        Dim field As New ButtonField()
        field.ButtonType = ButtonType.Link
        field.CausesValidation = False
        field.Text = "Add to List"
        field.CommandName = "Add"

        customerDetailsView.Fields.Add(field)

        ' Programmatically register the event-handling method
        ' for the ItemDeleting event of a DetailsView control.
        AddHandler customerDetailsView.ItemCommand, AddressOf CustomerDetailsView_ItemCommand

        ' Add the DetailsView object to the Controls collection
        ' of the PlaceHolder control.
        DetailsViewPlaceHolder.Controls.Add(customerDetailsView)

    End Sub

    Sub CustomerDetailsView_ItemCommand(ByVal sender As Object, ByVal e As DetailsViewCommandEventArgs)

        ' Use the CommandName property to determine which button
        ' was clicked. 
        If e.CommandName = "Add" Then

            ' Get the DetailsView control that raised the event.
            Dim customerDetailsView As DetailsView = CType(sender, DetailsView)

            ' Add the current customer to the customer list. 

            ' Get the row that contains the company name. In this
            ' example, the company name is in the second row (index 1)  
            ' of the DetailsView control.
            Dim row As DetailsViewRow = customerDetailsView.Rows(1)

            ' Get the company's name from the appropriate cell.
            ' In this example, the company name is in the second cell  
            ' (index 1) of the row.
            Dim name As String = row.Cells(1).Text

            ' Create a ListItem object with the company name.
            Dim item As New ListItem(name)

            ' Add the ListItem object to the ListBox, if the 
            ' item doesn't already exist.
            If Not CustomerListBox.Items.Contains(item) Then

                CustomerListBox.Items.Add(item)

            End If

        End If

    End Sub

End Class

L’exemple de code suivant montre comment ajouter de manière déclarative un DetailsViewCommandEventHandler délégué à l’événement ItemCommand d’un DetailsView contrôle.


<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    void CustomerDetailView_ItemCommand(Object sender, DetailsViewCommandEventArgs e)
    {

        // Use the CommandName property to determine which button
        // was clicked. 
        if (e.CommandName == "Add")
        {

            // Add the current store to the contact list. 

            // Get the row that contains the store name. In this
            // example, the store name is in the second row (index 1)  
            // of the DetailsView control.
            DetailsViewRow row = CustomerDetailView.Rows[1];

            // Get the store's name from the appropriate cell.
            // In this example, the store name is in the second cell  
            // (index 1) of the row.
            String name = row.Cells[1].Text;

            // Create a ListItem object with the store's name.
            ListItem item = new ListItem(name);

            // Add the ListItem object to the ListBox, if the 
            // item doesn't already exist.
            if (!ContactListBox.Items.Contains(item))
            {
                ContactListBox.Items.Add(item);
            }

        }

    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>
            DetailsView ItemCommand Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        <h3>
            DetailsView ItemCommand Example</h3>
        <asp:DetailsView ID="CustomerDetailView" 
            DataSourceID="DetailsViewSource"
            AutoGenerateRows="false" 
            DataKeyNames="CustomerID" 
            AllowPaging="true" 
            OnItemCommand="CustomerDetailView_ItemCommand"
            runat="server">
            
            <FieldHeaderStyle BackColor="Navy" ForeColor="White" />
            
            <Fields>
                <asp:BoundField DataField="CustomerID" HeaderText="Store ID" />
                <asp:BoundField DataField="CompanyName" HeaderText="Store Name" />
                <asp:BoundField DataField="City" HeaderText="City" />
                <asp:ButtonField CommandName="Add" Text="Add Contact" />
            </Fields>
        </asp:DetailsView>
        
        <hr />
        
        Contacts:<br />
        <asp:ListBox ID="ContactListBox" runat="server" />
        <!-- This example uses Microsoft SQL Server and connects  -->
        <!-- to the Northwind sample database. Use an ASP.NET     -->
        <!-- expression to retrieve the connection string value   -->
        <!-- from the web.config file.                            -->
        <asp:SqlDataSource ID="DetailsViewSource" runat="server" 
          ConnectionString=
            "<%$ ConnectionStrings:NorthWindConnectionString%>"
            InsertCommand="INSERT INTO [Customers]([CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country]) VALUES (@CustomerID, @CompanyName, @Address, @City, @PostalCode, @Country)"
          SelectCommand="Select [CustomerID], [CompanyName], 
            [Address], [City], [PostalCode], [Country] From 
            [Customers]">
        </asp:SqlDataSource>
    </form>
</body>
</html>


<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  Sub CustomerDetailView_ItemCommand(ByVal sender As Object, ByVal e As DetailsViewCommandEventArgs)
    
        ' Use the CommandName property to determine which button
        ' was clicked. 
        If e.CommandName = "Add" Then

            ' Add the current store to the contact list. 
     
            ' Get the row that contains the store name. In this
            ' example, the store name is in the second row (index 1)  
            ' of the DetailsView control.
            Dim row As DetailsViewRow = CustomerDetailView.Rows(1)
      
            ' Get the store's name from the appropriate cell.
            ' In this example, the store name is in the second cell  
            ' (index 1) of the row.
            Dim name As String = row.Cells(1).Text

            ' Create a ListItem object with the store's name.
            Dim item As New ListItem(name)

            ' Add the ListItem object to the ListBox, if the 
            ' item doesn't already exist.
            If Not ContactListBox.Items.Contains(item) Then
      
                ContactListBox.Items.Add(item)
      
            End If
        
        End If
    
    End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>
            DetailsView ItemCommand Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        <h3>
            DetailsView ItemCommand Example</h3>
        <asp:DetailsView ID="CustomerDetailView" 
            DataSourceID="DetailsViewSource"
            AutoGenerateRows="false" 
            DataKeyNames="CustomerID" 
            AllowPaging="true" 
            OnItemCommand="CustomerDetailView_ItemCommand"
            runat="server">
            
            <FieldHeaderStyle BackColor="Navy" ForeColor="White" />
            
            <Fields>
                <asp:BoundField DataField="CustomerID" HeaderText="Store ID" />
                <asp:BoundField DataField="CompanyName" HeaderText="Store Name" />
                <asp:BoundField DataField="City" HeaderText="City" />
                <asp:ButtonField CommandName="Add" Text="Add Contact" />
            </Fields>
        </asp:DetailsView>
        
        <hr />
        
        Contacts:<br />
        <asp:ListBox ID="ContactListBox" runat="server" />
        <!-- This example uses Microsoft SQL Server and connects  -->
        <!-- to the Northwind sample database. Use an ASP.NET     -->
        <!-- expression to retrieve the connection string value   -->
        <!-- from the web.config file.                            -->
        <asp:SqlDataSource ID="DetailsViewSource" runat="server" 
          ConnectionString=
            "<%$ ConnectionStrings:NorthWindConnectionString%>"
            InsertCommand="INSERT INTO [Customers]([CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country]) VALUES (@CustomerID, @CompanyName, @Address, @City, @PostalCode, @Country)"
          SelectCommand="Select [CustomerID], [CompanyName], 
            [Address], [City], [PostalCode], [Country] From 
            [Customers]">
        </asp:SqlDataSource>
    </form>
</body>
</html>

Remarques

Le DetailsView contrôle déclenche l’événement ItemCommand lorsque l’utilisateur clique sur un bouton dans un ButtonFieldchamp de ligne , CommandFieldou TemplateField . Cela vous permet de fournir un gestionnaire d’événements qui effectue une routine personnalisée chaque fois que cet événement se produit.

Notes

Le DetailsView contrôle déclenche également d’autres événements spécialisés lorsque l’utilisateur clique sur certains boutons (boutons dont la CommandName propriété est définie sur « Supprimer », « Insérer », « Page » ou « Mettre à jour »). Lorsque vous utilisez l’un de ces boutons, vous devez envisager d’utiliser l’un des événements spécialisés fournis par le contrôle (par ItemDeleted exemple, ou ItemDeleting).

Lorsque vous créez un délégué DetailsViewCommandEventHandler, vous identifiez la méthode qui gérera l'événement. Pour associer l'événement au gestionnaire d'événements, ajoutez une instance du délégué à l'événement. Le gestionnaire d'événements est appelé chaque fois qu'un événement se produit, sauf si vous supprimez le délégué. Pour plus d’informations sur les délégués de gestionnaire d’événements, consultez Gestion et déclenchement d’événements.

Méthodes d’extension

GetMethodInfo(Delegate)

Obtient un objet qui représente la méthode représentée par le délégué spécifié.

S’applique à

Voir aussi