ResourceExpressionEditor::EvaluateExpression Method (String^, Object^, Type^, IServiceProvider^)

 

Evaluates a resource expression and provides the design-time value for a control property.

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

public:
virtual Object^ EvaluateExpression(
	String^ expression,
	Object^ parseTimeData,
	Type^ propertyType,
	IServiceProvider^ serviceProvider
) override

Parameters

expression
Type: System::String^

A resource expression to evaluate. expression does not include the Resources expression prefix.

parseTimeData
Type: System::Object^

An object supplying additional parse data, in the form of a ResourceExpressionFields value.

propertyType
Type: System::Type^

The type of the control property.

serviceProvider
Type: System::IServiceProvider^

A service provider implementation supplied by the designer host, used to obtain additional design-time services.

Return Value

Type: System::Object^

The object referenced by the evaluated expression string, if the expression evaluation succeeded; otherwise, null.

The EvaluateExpression method looks up the resource that is specified by expression, and then returns the resource.

The visual designer uses the EvaluateExpression method to evaluate a resource expression and provide the design-time value for an associated control property. At run time, the page parser uses the EvaluateExpression and GetCodeExpression methods of the corresponding ResourceExpressionBuilder implementation to evaluate an expression and provide the run-time value for an associated control property.

The visual designer uses the ParseExpression method to parse the expression string at design time, and then calls the EvaluateExpression method with the parsed expression data.

.NET Framework
Available since 2.0
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