ConnectionStringsExpressionBuilder.EvaluateExpression Method

Reference

Definition

Namespace:: System.Web.Compilation

Assembly:: System.Web.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Returns a value from the <connectionStrings> section of the Web.config file.

public:
 override System::Object ^ EvaluateExpression(System::Object ^ target, System::Web::UI::BoundPropertyEntry ^ entry, System::Object ^ parsedData, System::Web::Compilation::ExpressionBuilderContext ^ context);

public override object EvaluateExpression (object target, System.Web.UI.BoundPropertyEntry entry, object parsedData, System.Web.Compilation.ExpressionBuilderContext context);

override this.EvaluateExpression : obj * System.Web.UI.BoundPropertyEntry * obj * System.Web.Compilation.ExpressionBuilderContext -> obj

Public Overrides Function EvaluateExpression (target As Object, entry As BoundPropertyEntry, parsedData As Object, context As ExpressionBuilderContext) As Object

Parameters

target: Object

The object that contains the expression.

entry: BoundPropertyEntry

The property to which the expression is bound.

parsedData: Object

The object that represents parsed data as returned by ParseExpression(String, Type, ExpressionBuilderContext).

context: ExpressionBuilderContext

Properties for the control or page.

Returns

Object

The Object associated with a key in the <connectionStrings> section of the Web.config file.

Exceptions

InvalidOperationException

The connection string name could not be found in the Web.config file.

Remarks

This method is called when an expression of the form <%$ ConnectionStrings: secureConnectionString %> is encountered in a page that is not compiled. It retrieves the appropriate value from the <connectionStrings> section of the Web.config file. This method overrides the EvaluateExpression method by calling the GetConnectionString method if a connection string is included in the parsedData parameter, or by calling the GetConnectionStringProviderName method if a connection string is not included in the parsedData parameter.

Applies to