Export (0) Print
Expand All

LinqDataSourceDeleteEventArgs Class

Provides data for the Deleting event.

System.Object
  System.EventArgs
    System.ComponentModel.CancelEventArgs
      System.Web.UI.WebControls.LinqDataSourceDeleteEventArgs

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web.Extensions (in System.Web.Extensions.dll)

public class LinqDataSourceDeleteEventArgs : CancelEventArgs

The LinqDataSourceDeleteEventArgs type exposes the following members.

  NameDescription
Public methodLinqDataSourceDeleteEventArgs(LinqDataSourceValidationException)Initializes a new instance of the LinqDataSourceDeleteEventArgs class with the specified exception.
Public methodLinqDataSourceDeleteEventArgs(Object)Initializes a new instance of the LinqDataSourceDeleteEventArgs class.
Top

  NameDescription
Public propertyCancelGets or sets a value indicating whether the event should be canceled. (Inherited from CancelEventArgs.)
Public propertyExceptionGets the exception that was thrown while the data was being validated before the delete operation.
Public propertyExceptionHandledGets or sets a value that indicates whether the exception was handled and that it should not be thrown again.
Public propertyOriginalObjectGets the object that represents the data to delete.
Top

  NameDescription
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Top

The LinqDataSourceDeleteEventArgs object is passed to any handler for the Deleting event. The OriginalObject property contains the data that will be deleted.

If the object that represents the data source throws a validation exception before it deletes the data, the Exception property contains an instance of the LinqDataSourceValidationException class. You can retrieve all the validation exceptions through the InnerExceptions property. If no validation exception is thrown, the Exception property contains null. If you handle the validation exceptions and do not want the exception to be re-thrown, set the ExceptionHandled property to true.

You create an event handler for the Deleting event to validate the data, to examine validation errors from the data class, or to cancel the delete operation. You cancel the delete operation by setting the Cancel property to true.

By default, the LinqDataSource control stores the original values from the data source in view state in the Web page, except those whose ColumnAttribute attribute is marked as UpdateCheck.Never. LINQ to SQL automatically checks the integrity of the data before deleting the data. It does this by comparing the current values in the data source with the original values that are stored in view state. You can perform additional data validation by creating a handler for the Deleting event.

The following example shows how to cancel the delete operation based on a property in the OriginalObject property and a value from the Web page. In the example, users must select a CheckBox control to confirm that they want to delete a product record when its OnSale property is set to true.

protected void LinqDataSource_Deleting(object sender, LinqDataSourceDeleteEventArgs e)
{
    Product product = (Product)e.OriginalObject;
    if (product.OnSale && !confirmCheckBox.Checked)
    {
        e.Cancel = true;
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Show:
© 2014 Microsoft