System.Web.UI.WebControls.Expressions Namespace
The System.Web.UI.WebControls.Expressions namespace provides classes that enable you to filter data in a Web page by using the QueryExtender control.
| Class | Description | |
|---|---|---|
 | CustomExpression | Provides a way to specify a custom LINQ query that is called in response to an event. |
| CustomExpressionEventArgs | Represents the event data for the CustomExpression class. |
| DataSourceExpression | Represents a base class for creating expression classes. |
| DataSourceExpressionCollection | Represents a collection of expressions to apply to a data source control. |
| MethodExpression | Provides a way to specify a custom LINQ query that is defined in a method. |
| OfTypeExpression | Provides a way to filter a query based on a specified type. |
| OrderByExpression | Provides a way to apply a sort expression to an IQueryable object. |
| ParameterDataSourceExpression | Represents an abstract base class for ParameterDataSourceExpression objects. |
| PropertyExpression | Provides a way to create a Where clause from parameters in a WhereParameters collection. |
| QueryExpression | Retrieves instances of a specific entity type by using a complex query. |
| RangeExpression | Provides a way to determine whether a value is greater than or less than a specified value, or whether a value is between two specified values. |
| SearchExpression | Provides a way to search a field or fields for string values and compare them to a specified string value. |
| ThenBy | Provides a way to apply a sort expression to an IQueryable data source object after an OrderByExpression expression is applied. |
| Enumeration | Description | |
|---|---|---|
 | RangeType | Specifies the type of numeric comparison to use in an instance of the RangeExpression class. |
| SearchType | Specifies the type of search in an instance of the SearchExpression class. |
This namespace contains expressions that are used with the QueryExtender control to filter data in a Web page using declarative syntax. The classes in this namespace include System.Web.UI.WebControls.Expressions::SearchExpression, System.Web.UI.WebControls.Expressions::RangeExpression, System.Web.UI.WebControls.Expressions::PropertyExpression, System.Web.UI.WebControls.Expressions::OrderByExpression and System.Web.UI.WebControls.Expressions::CustomExpression.