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ObjectDataSourceFilteringEventArgs Class

 

Provides data for the Filtering event of the ObjectDataSource control.

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

System::Object
  System::EventArgs
    System.ComponentModel::CancelEventArgs
      System.Web.UI.WebControls::ObjectDataSourceFilteringEventArgs

public ref class ObjectDataSourceFilteringEventArgs : CancelEventArgs

NameDescription
System_CAPS_pubmethodObjectDataSourceFilteringEventArgs(IOrderedDictionary^)

Initializes a new instance of the ObjectDataSourceFilteringEventArgs class by using the specified object.

NameDescription
System_CAPS_pubpropertyCancel

Gets or sets a value indicating whether the event should be canceled.(Inherited from CancelEventArgs.)

System_CAPS_pubpropertyParameterValues

Gets an IOrderedDictionary interface that provides access to the Parameter objects of the ObjectDataSource class.

NameDescription
System_CAPS_pubmethodEquals(Object^)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

The ObjectDataSourceFilteringEventArgs class is used to pass data to the Filtering event handler of the ObjectDataSource control. The ParameterValues property provides access to the filter parameter values before the filtering operation is performed. You can cancel the Select method by setting the Cancel property of the ObjectDataSourceFilteringEventArgs to true.

This section contains two code examples. The first code example demonstrates how to display filtered data by using an ObjectDataSource control to retrieve data from a middle-tier business object, and then using a GridView control to display the results. The second code example provides an example of a middle-tier business object that is used by the first code example.

The following code example demonstrates how to display filtered data by using an ObjectDataSource control to retrieve data from a middle-tier business object, and then using a GridView control to display the results. The ObjectDataSource control can filter data only when the method that retrieves the data retrieves it as a DataSet or DataTable object. For this reason, the SelectMethod property identifies a business object method that retrieves data as a DataSet or DataTable object.

The code example consists of a TextBox control, a GridView control, the ObjectDataSource control, and a Submit button. By default, the TextBox control is populated with the name of one of the employees at Northwind Traders. The GridView control displays information about the employee who is identified by the name in the TextBox. To retrieve data for another employee, in the TextBox control, type the full name of the employee, and then click the Submit button.

The FilterExpression property specifies an expression that is used to filter the data that is retrieved by the method that is specified by the SelectMethod property. It uses parameter placeholders that are evaluated to the parameters that are contained in the FilterParameters collection. In this example, the parameter placeholder is enclosed by single quotation marks (') because the type of the parameter is a string type that might contain spaces. If the type of the parameter is numeric or date, quotation marks are not required. The FilterParameters collection contains one parameter, a FormParameter object that is bound to the TextBox control.

If no name is specified in the TextBox control, a new parameter is added to the ParameterValues collection so that the search is successful.

System_CAPS_security Security Note

This example contains a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview.

No code example is currently available or this language may not be supported.

The following code example provides an example of a middle-tier business object that the preceding code example uses. The code example consists of two basic classes: EmployeeLogic and NorthwindEmployee. The EmployeeLogic class encapsulates business logic and the NorthwindEmployee class is a model class that contains only the basic functionality that is required to load and persist data from the data tier. For simplicity, the EmployeeLogic class creates a static set of data, rather than retrieving the data from a data tier. For a complete working example, you must compile and use these classes with the Web Forms code examples that are provided.

No code example is currently available or this language may not be supported.

.NET Framework
Available since 2.0

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

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