TemplateControl.Eval Method (String) (System.Web.UI)

Eval Method (String)

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This page is specific to

Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

TemplateControl..::.Eval Method (String)

Evaluates a data-binding expression.

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

Syntax

Visual Basic (Declaration)

Protected Friend Function Eval ( _
    expression As String _
) As Object

Visual Basic (Usage)

Dim expression As String
Dim returnValue As Object

returnValue = Me.Eval(expression)

protected internal Object Eval(
    string expression
)

Visual C++

protected public:
Object^ Eval(
    String^ expression
)

JScript

protected internal function Eval(
    expression : String
) : Object

Parameters

expression: Type: System..::.String
The navigation path from the container to the public property value to place in the bound control property.

Return Value

Type: System..::.Object
An object that results from the evaluation of the data-binding expression.

Exceptions

Exception	Condition
InvalidOperationException	The data-binding method can be used only for controls contained on a Page.
ArgumentNullException	expression is nullNothingnullptra null reference (Nothing in Visual Basic). - or - expression is an empty string ("").

Exception

Condition

InvalidOperationException

The data-binding method can be used only for controls contained on a Page.

ArgumentNullException

expression is nullNothingnullptra null reference (Nothing in Visual Basic).

- or -

expression is an empty string ("").

Remarks

The value of expression must evaluate to a public property.

The Eval method calls the DataBinder..::.Eval method using the GetDataItem method to resolve the object reference that the expression is evaluated against.

Platforms

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.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0

Reference

TemplateControl Class

TemplateControl Members

Eval Overload

System.Web.UI Namespace

DataBinder

Other Resources

Data-Binding Expression Syntax