DetailsViewInsertEventArgs.CommandArgument Propiedad

  • Referencia

Definición

Espacio de nombres:
System.Web.UI.WebControls
Ensamblado:
System.Web.dll

Obtiene el argumento de comando para la operación de inserción pasada al control DetailsView.

public:
 property System::Object ^ CommandArgument { System::Object ^ get(); };
public object CommandArgument { get; }
member this.CommandArgument : obj
Public ReadOnly Property CommandArgument As Object

Valor de propiedad

Object

El argumento de comando para la operación de inserción que se pasa al control DetailsView.

Ejemplos

En el ejemplo de código siguiente se muestra cómo establecer la CommandArgument propiedad de un Button control y recuperar y usar el valor durante el ItemInserting evento.


<%@ 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 CustomerDetailsView_ItemInserting(Object sender, DetailsViewInsertEventArgs e)
  {
    // Use the Values property to retrieve the key field value.
    String keyValue = e.Values["CustomerID"].ToString();

    if (((string)(e.CommandArgument)) == "CheckID")
    {
        // Insert the record only if the key field is four characters
        // long; otherwise, cancel the insert operation.
        if (keyValue.Length == 4)
        {
            // Change the key field value to upper case before inserting 
            // the record in the data source.
            e.Values["CustomerID"] = keyValue.ToUpper();

            MessageLabel.Text = "";
        }
        else
        {
            MessageLabel.Text = "The key field must have four digits.";
            e.Cancel = true;
        }
    }
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewInsertEventArgs Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        
      <h3>DetailsViewInsertEventArgs Example</h3>
                
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          datakeynames="CustomerID"
          autogeneraterows="true"
          allowpaging="true" AutoGenerateInsertButton="true"
          oniteminserting="CustomerDetailsView_ItemInserting" 
          runat="server">

            <Fields>
                <asp:TemplateField >
                  <InsertItemTemplate>
                    <asp:Button CommandName="Insert" CommandArgument="CheckID" 
                      runat="server" Text="Insert with ID Check" BackColor="green" />
                  </InsertItemTemplate>
                </asp:TemplateField>
            </Fields>               
        </asp:detailsview>
        
        <asp:label id="MessageLabel"
          forecolor="Red"
          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]"
          insertcommand="INSERT INTO [Customers]([CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country]) VALUES (@CustomerID, @CompanyName, @Address, @City, @PostalCode, @Country)"
          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 CustomerDetailsView_ItemInserting(ByVal sender As Object, ByVal e As DetailsViewInsertEventArgs)
  
        ' Use the Values property to retrieve the key field value.
        Dim keyValue As String = e.Values("CustomerID").ToString()

        If CStr(e.CommandArgument) = "CheckID" Then
            ' Insert the record only if the key field is four characters
            ' long; otherwise, cancel the insert operation.
            If keyValue.Length = 4 Then
                ' Change the key field value to upper case before inserting 
                ' the record in the data source.
                e.Values("CustomerID") = keyValue.ToUpper()

                MessageLabel.Text = ""
            Else
                MessageLabel.Text = "The key field must have four digits."
                e.Cancel = True
            End If
        End If
    End Sub


</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewInsertEventArgs Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        
      <h3>DetailsViewInsertEventArgs Example</h3>
                
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          datakeynames="CustomerID"
          autogeneraterows="true"
          allowpaging="true" AutoGenerateInsertButton="true"
          oniteminserting="CustomerDetailsView_ItemInserting" 
          runat="server">

            <Fields>
                <asp:TemplateField >
                  <InsertItemTemplate>
                    <asp:Button ID="Button1" CommandName="Insert" CommandArgument="CheckID" 
                      runat="server" Text="Insert with ID Check" BackColor="green" />
                  </InsertItemTemplate>
                </asp:TemplateField>
            </Fields>               
        </asp:detailsview>
        
        <asp:label id="MessageLabel"
          forecolor="Red"
          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]"
          insertcommand="INSERT INTO [Customers]([CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country]) VALUES (@CustomerID, @CompanyName, @Address, @City, @PostalCode, @Country)"
          connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

Comentarios

Utilice la CommandArgument propiedad para determinar el valor del argumento de comando pasado al DetailsView control . La CommandArgument propiedad se utiliza para llevar información adicional sobre la inserción.

Se aplica a

Consulte también