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ConnectionStringsExpressionBuilder::EvaluateExpression Method

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

Namespace:  System.Web.Compilation
Assembly:  System.Web (in System.Web.dll)

public:
virtual Object^ EvaluateExpression(
	Object^ target, 
	BoundPropertyEntry^ entry, 
	Object^ parsedData, 
	ExpressionBuilderContext^ context
) override

Parameters

target
Type: System::Object

The object that contains the expression.

entry
Type: System.Web.UI::BoundPropertyEntry

The property to which the expression is bound.

parsedData
Type: System::Object

The object that represents parsed data as returned by ParseExpression.

context
Type: System.Web.Compilation::ExpressionBuilderContext

Properties for the control or page.

Return Value

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

ExceptionCondition
InvalidOperationException

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

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.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0
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