DetailsViewInsertEventArgs.CommandArgument Propriété

  • Référence

Définition

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

Obtient l'argument de commande pour l'opération d'insertion passée au contrôle DetailsView.

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

Valeur de propriété

Object

Argument de commande pour l'opération d'insertion passée au contrôle DetailsView.

Exemples

L’exemple de code suivant montre comment définir la CommandArgument propriété d’un Button contrôle et récupérer et utiliser la valeur pendant l’événement ItemInserting .


<%@ 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>

Remarques

Utilisez la CommandArgument propriété pour déterminer la valeur de l’argument de commande passé au DetailsView contrôle. La CommandArgument propriété est utilisée pour transporter des informations supplémentaires sur l’insertion.

S’applique à

Voir aussi