DetailsViewInsertEventArgs.CommandArgument Eigenschaft

Referenz

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Wichtig

Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.

Ruft das Befehlsargument für den Einfügevorgang ab, der an das DetailsView-Steuerelement übergeben wurde.

public:
 property System::Object ^ CommandArgument { System::Object ^ get(); };

public object CommandArgument { get; }

member this.CommandArgument : obj

Public ReadOnly Property CommandArgument As Object

Eigenschaftswert

Object

Das Befehlsargument für den Einfügevorgang, der an das DetailsView-Steuerelement übergeben wurde.

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie die CommandArgument -Eigenschaft eines Button Steuerelements festgelegt und der Wert während des ItemInserting Ereignisses abgerufen und verwendet wird.


<%@ 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>

Hinweise

Verwenden Sie die CommandArgument -Eigenschaft, um den Wert des Befehlsarguments zu bestimmen, das an das DetailsView Steuerelement übergeben wird. Die CommandArgument -Eigenschaft wird verwendet, um zusätzliche Informationen zum Einfügen zu enthalten.

Gilt für:

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