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ExpressionBuilder.EvaluateExpression Method

.NET Framework 4

Other Versions

When overridden in a derived class, returns an object that represents an evaluated expression.

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

Syntax

C++

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

Parameters

target: Type: System.Object
The object containing the expression.

entry: Type: System.Web.UI.BoundPropertyEntry
The object that represents information about the property bound to by the expression.

parsedData: Type: System.Object
The object containing parsed data as returned by ParseExpression.

context: Type: System.Web.Compilation.ExpressionBuilderContext
Contextual information for the evaluation of the expression.

Return Value

Type: System.Object
An object that represents the evaluated expression; otherwise, null if the inheritor does not implement EvaluateExpression.

Remarks

If you want your ExpressionBuilder object to be active on a page that supports the no-compile feature, you can override the EvaluateExpression method and the SupportsEvaluate property. The EvaluateExpression method should return the evaluation of the current expression.

Notes to Inheritors

If you override the EvaluateExpression method, you must also override the SupportsEvaluate property.

Examples

The following code example demonstrates how to use the overridden EvaluateExpression method to return an evaluated expression.

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    public override object EvaluateExpression(object target, BoundPropertyEntry entry, 
	object parsedData, ExpressionBuilderContext context)
    {
        return GetEvalData(entry.Expression, target.GetType(), entry.Name);
    }

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Platforms

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.

Reference

ExpressionBuilder Class

System.Web.Compilation Namespace

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