FormViewDeletedEventArgs FormViewDeletedEventArgs FormViewDeletedEventArgs FormViewDeletedEventArgs Class

Определение

Предоставляет данные для события ItemDeleted.Provides data for the ItemDeleted event.

public ref class FormViewDeletedEventArgs : EventArgs
public class FormViewDeletedEventArgs : EventArgs
type FormViewDeletedEventArgs = class
    inherit EventArgs
Public Class FormViewDeletedEventArgs
Inherits EventArgs
Наследование
FormViewDeletedEventArgsFormViewDeletedEventArgsFormViewDeletedEventArgsFormViewDeletedEventArgs

Примеры

В следующем примере показано, как использовать объект FormViewDeletedEventArgs , переданный в метод обработки событий ItemDeleted для события, чтобы определить, произошло ли исключение во время операции удаления.The following example demonstrates how to use the FormViewDeletedEventArgs object passed to the event-handling method for the ItemDeleted event to determine whether an exception occurred during a delete operation.


<%@ 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 EmployeeFormView_ItemDeleted(Object sender, FormViewDeletedEventArgs e)
  {
    // Use the Exception property to determine whether an exception
    // occurred during the delete operation.
    if (e.Exception == null)
    {
      // Use the AffectedRows property to determine whether the
      // record was deleted. Sometimes an error might occur that 
      // does not raise an exception, but prevents the delete
      // operation from completing.
      if (e.AffectedRows == 1)
      {
        MessageLabel.Text = "Record deleted successfully.";
      }
      else
      {
        MessageLabel.Text = "An error occurred during the delete operation.";
      }
    }
    else
    {
      // Insert the code to handle the exception.
      MessageLabel.Text = e.Exception.Message;
      
      // Use the ExceptionHandled property to indicate that the 
      // exception has already been handled.
      e.ExceptionHandled = true;
    }
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>FormViewDeletedEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>FormViewDeletedEventArgs Example</h3>
                       
      <asp:formview id="EmployeeFormView"
        datasourceid="EmployeeSource"
        allowpaging="true"
        datakeynames="EmployeeID"
        onitemdeleted="EmployeeFormView_ItemDeleted"  
        runat="server">
        
        <itemtemplate>
        
          <table>
            <tr>
              <td>
                <asp:image id="EmployeeImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>' 
                  runat="server"/>
              </td>
              <td>
                <h3><%# Eval("FirstName") %>&nbsp;<%# Eval("LastName") %></h3>      
                <%# Eval("Title") %>        
              </td>
            </tr>
            <tr>
              <td colspan="2">
                <asp:button id="DeleteButton"
                  text="Delete Record"
                  commandname="Delete"
                  runat="server" />
              </td>
            </tr>
          </table>
        
        </itemtemplate>         
                  
      </asp:formview>
      
      <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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
        deletecommand="Delete [Employees] Where [EmployeeID]=@EmployeeID"
        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 EmployeeFormView_ItemDeleted(ByVal sender As Object, ByVal e As FormViewDeletedEventArgs) Handles EmployeeFormView.ItemDeleted
  
    ' Use the Exception property to determine whether an exception
    ' occurred during the delete operation.
    If e.Exception Is Nothing Then
    
      ' Use the AffectedRows property to determine whether the
      ' record was deleted. Sometimes an error might occur that 
      ' does not raise an exception, but prevents the delete
      ' operation from completing.
      If e.AffectedRows = 1 Then
      
        MessageLabel.Text = "Record deleted successfully."
      
      Else
              
        MessageLabel.Text = "An error occurred during the delete operation."
      
      End If
    
    Else
    
      ' Insert the code to handle the exception.
      MessageLabel.Text = e.Exception.Message
      
      ' Use the ExceptionHandled property to indicate that the 
      ' exception has already been handled.
      e.ExceptionHandled = True
      
    End If
    
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>FormViewDeletedEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>FormViewDeletedEventArgs Example</h3>
                       
      <asp:formview id="EmployeeFormView"
        datasourceid="EmployeeSource"
        allowpaging="true"
        datakeynames="EmployeeID"
        runat="server">
        
        <itemtemplate>
        
          <table>
            <tr>
              <td>
                <asp:image id="EmployeeImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>' 
                  runat="server"/>
              </td>
              <td>
                <h3><%# Eval("FirstName") %>&nbsp;<%# Eval("LastName") %></h3>      
                <%# Eval("Title") %>        
              </td>
            </tr>
            <tr>
              <td colspan="2">
                <asp:button id="DeleteButton"
                  text="Delete Record"
                  commandname="Delete"
                  runat="server" />
              </td>
            </tr>
          </table>
        
        </itemtemplate>         
                  
      </asp:formview>
      
      <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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
        deletecommand="Delete [Employees] Where [EmployeeID]=@EmployeeID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
            
    </form>
  </body>
</html>

Комментарии

Элемент управления CommandName вызывает событие, когда нажата кнопка удаления (кнопка со свойством "Удалить") в FormView элементе управления, но после того, как элемент управления удалит запись. ItemDeleted FormViewThe FormView control raises the ItemDeleted event when a Delete button (a button with its CommandName property set to "Delete") within the control is clicked, but after the FormView control deletes the record. Это позволяет предоставить метод обработки событий, выполняющий пользовательскую подпрограммы, например проверку результатов операции удаления, когда происходит это событие.This allows you to provide an event-handling method that performs a custom routine, such as checking the results of a delete operation, whenever this event occurs.

FormViewDeletedEventArgs Объект передается методу обработки событий, который позволяет определить количество затронутых записей и все исключения, которые могли произойти.A FormViewDeletedEventArgs object is passed to the event-handling method, which allows you to determine the number of records affected and any exceptions that might have occurred. Чтобы определить количество записей, затронутых операцией удаления, используйте AffectedRows свойство.To determine the number of records affected by the delete operation, use the AffectedRows property. Используйте свойство Exception , чтобы определить, возникли ли какие либо исключения.Use the Exception property to determine whether any exceptions occurred. Можно также указать, было ли исключение обработано в методе обработки событий, задав ExceptionHandled свойство.You can also indicate whether the exception was handled in the event-handling method by setting the ExceptionHandled property.

Примечание

Если исключение возникает во время операции удаления, а ExceptionHandled свойство имеет falseзначение, FormView элемент управления повторно создает исключение.If an exception occurs during the delete operation and the ExceptionHandled property is set to false, the FormView control re-throws the exception.

Если требуется получить доступ к парам имя/значение ключевых полей и неключевых полей удаленной записи, используйте Keys свойства и Values соответственно.If you want to access the name/value pairs of the key fields and non-key fields of the deleted record, use the Keys and Values properties, respectively.

Дополнительные сведения об обработке событий см. в разделе обработка и вызов событий.For more information about how to handle events, see Handling and Raising Events.

Конструкторы

FormViewDeletedEventArgs(Int32, Exception) FormViewDeletedEventArgs(Int32, Exception) FormViewDeletedEventArgs(Int32, Exception) FormViewDeletedEventArgs(Int32, Exception)

Инициализирует новый экземпляр класса FormViewDeletedEventArgs.Initializes a new instance of the FormViewDeletedEventArgs class.

Свойства

AffectedRows AffectedRows AffectedRows AffectedRows

Возвращает число строк, затронутых операцией удаления.Gets the number of rows affected by the delete operation.

Exception Exception Exception Exception

Возвращает исключение (если оно произошло), во время операции удаления.Gets the exception (if any) that was raised during the delete operation.

ExceptionHandled ExceptionHandled ExceptionHandled ExceptionHandled

Получает или задает значение, определяющее, было ли обработано произошедшее во время операции удаления исключение в данном обработчике.Gets or sets a value indicating whether an exception that was raised during the delete operation was handled in the event handler.

Keys Keys Keys Keys

Возвращает упорядоченный словарь, содержащий пары "имя/значение" для ключевых полей удаленной записи.Gets an ordered dictionary of key field name/value pairs for the deleted record.

Values Values Values Values

Получает словарь пар "имя/значение" для неключевых полей удаленной записи.Gets a dictionary of the non-key field name/value pairs for the deleted record.

Методы

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Определяет, равен ли заданный объект текущему объекту.Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Служит хэш-функцией по умолчанию.Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Возвращает объект Type для текущего экземпляра.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Создает неполную копию текущего объекта Object.Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

Возвращает строку, представляющую текущий объект.Returns a string that represents the current object.

(Inherited from Object)

Применяется к

Дополнительно