DetailsViewUpdatedEventArgs.Exception Propiedad

Referencia

Definición

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

Ensamblado:: System.Web.dll

Importante

Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.

Obtiene la excepción que se ha producido durante la operación de actualización, si la hubiera.

public:
 property Exception ^ Exception { Exception ^ get(); };

public Exception Exception { get; }

member this.Exception : Exception

Public ReadOnly Property Exception As Exception

Valor de propiedad

Exception

Objeto Exception que representa la excepción que se provocó durante la operación de actualización.

Ejemplos

En el ejemplo de código siguiente se muestra cómo usar la Exception propiedad para determinar si se produjo una excepción durante una operación de actualización.


<%@ 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_ItemUpdated(Object sender, 
    DetailsViewUpdatedEventArgs e)
  {
    // Use the Exception property to determine whether an exception
    // occurred during the insert operation.
    if (e.Exception == null)
    {
      // Use the Values property to get the value entered by 
      // the user for the CompanyName field.
      String keyFieldValue = e.Keys["CustomerID"].ToString();

      // Display a confirmation message.
      MessageLabel.Text = "Record " + keyFieldValue + 
        " updated successfully. ";

      // Display the old and new values.
      DisplayValues(e);

      if (e.AffectedRows == 1)
      {
        MessageLabel.Text += e.AffectedRows.ToString() + 
          " record updated.";
      }
      else
      {
        MessageLabel.Text += e.AffectedRows.ToString() + 
          " records updated.";
      }
    }
    else
    {
      // Insert the code to handle the exception.
      MessageLabel.Text = e.Exception.Message;

      // Use the ExceptionHandled property to indicate that the 
      // exception is already handled.
      e.ExceptionHandled = true;

      // When an exception occurs, keep the DetailsView
      // control in edit mode.
      e.KeepInEditMode = true;
    }
  }

  void DisplayValues(DetailsViewUpdatedEventArgs e)
  {
    
    MessageLabel.Text += "<br/></br>";
    
    // Iterate through the OldValue and NewValues
    // properties and display the values.
    for (int i = 0; i < e.OldValues.Count; i++)
    {
      MessageLabel.Text += "Old Value=" + e.OldValues[i].ToString() +
        ", New Value=" + e.NewValues[i].ToString() + "<br/>";
    }

    MessageLabel.Text += "</br>";
    
  }
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >

  <head runat="server">
    <title>DetailsViewUpdatedEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DetailsViewUpdatedEventArgs Example</h3>
                       
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          autogeneraterows="true"
          autogenerateeditbutton="true"  
          allowpaging="true"
          datakeynames="CustomerID" 
          onitemupdated="CustomerDetailsView_ItemUpdated"
          runat="server">
            
          <pagersettings position="Bottom"/> 
                    
        </asp:detailsview>
        
        <br/>
        
        <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]"
          updatecommand="Update [Customers] Set 
          [CompanyName]=@CompanyName, [Address]=@Address, 
          [City]=@City, [PostalCode]=@PostalCode, 
          [Country]=@Country 
          Where [CustomerID]=@CustomerID"
          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_ItemUpdated(ByVal sender As Object, ByVal e As DetailsViewUpdatedEventArgs)
  
    ' Use the Exception property to determine whether an exception
    ' occurred during the insert operation.
    If e.Exception Is Nothing Then
    
      ' Use the Values property to get the value entered by 
      ' the user for the CompanyName field.
      Dim keyFieldValue As String = e.Keys("CustomerID").ToString()

      ' Display a confirmation message.
      MessageLabel.Text = "Record " & keyFieldValue & _
        " updated successfully. "

      ' Display the old and new values.
      DisplayValues(e)

      If e.AffectedRows = 1 Then

        MessageLabel.Text &= e.AffectedRows.ToString() & _
          " record updated."
      
      Else
      
        MessageLabel.Text &= e.AffectedRows.ToString() & _
          " records updated."
      
      End If
    
    Else
    
      ' Insert the code to handle the exception.
      MessageLabel.Text = e.Exception.Message

      ' Use the ExceptionHandled property to indicate that the 
      ' exception is already handled.
      e.ExceptionHandled = True

      ' When an exception occurs, keep the DetailsView
      ' control in edit mode.
      e.KeepInEditMode = True
    
    End If
    
  End Sub

  Sub DisplayValues(ByVal e As DetailsViewUpdatedEventArgs)
    
    MessageLabel.Text &= "<br/></br>"
    
    ' Iterate through the OldValue and NewValues
    ' properties and display the values.
    Dim i As Integer
        
    For i = 0 To e.OldValues.Count - 1
    
      MessageLabel.Text &= "Old Value=" & e.OldValues(i).ToString() & _
        ", New Value=" & e.NewValues(i).ToString() & "<br/>"
    
    Next

    MessageLabel.Text &= "</br>"
    
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >

  <head runat="server">
    <title>DetailsViewUpdatedEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DetailsViewUpdatedEventArgs Example</h3>
                       
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          autogeneraterows="true"
          autogenerateeditbutton="true"  
          allowpaging="true"
          datakeynames="CustomerID" 
          onitemupdated="CustomerDetailsView_ItemUpdated"
          runat="server">
            
          <pagersettings position="Bottom"/> 
                    
        </asp:detailsview>
        
        <br/>
        
        <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]"
          updatecommand="Update [Customers] Set 
          [CompanyName]=@CompanyName, [Address]=@Address, 
          [City]=@City, [PostalCode]=@PostalCode, 
          [Country]=@Country 
          Where [CustomerID]=@CustomerID"
          connectionstring=
          "<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

Comentarios

Utilice la Exception propiedad para determinar la excepción (si existe) que se generó durante la operación de actualización. Si no se ha producido ninguna excepción, esta propiedad devolverá null.

Nota:

Si se ha generado una excepción y decide controlar la excepción en el controlador de eventos, asegúrese de establecer la ExceptionHandled propiedad trueen ; de lo contrario, la excepción se pasa al método siguiente en la pila de llamadas para su control.

Se aplica a

DetailsViewUpdatedEventArgs.Exception Propiedad

Definición

Valor de propiedad

Ejemplos

Comentarios

Se aplica a

Consulte también

Comentarios

Recursos adicionales