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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.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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