Evaluates a data-binding expression using the specified format string to display the result.
Assembly: System.Web (in System.Web.dll)
Syntax . . :: . String
A string that results from the evaluation of the data-binding expression and conversion to a string type.
Protected Friend Function Eval ( _
expression As String, _
format As String _
) As Stringprotected internal string Eval(
string expression,
string format
)protected public:
String^ Eval(
String^ expression,
String^ format
)member Eval :
expression:string *
format:string -> string
Parameters
- expression
- Type: System
. . :: . String
The navigation path from the container to the public property value to place in the bound control property.
- format
- Type: System
. . :: . String
A .NET Framework format string to apply to the result.
Return Value
Type: SystemA string that results from the evaluation of the data-binding expression and conversion to a string type.
Exceptions
| Exception | Condition |
|---|---|
| InvalidOperationException | The data-binding method can only be used for controls contained on a Page. |
| ArgumentNullException | expression is - or - expression is an empty string (""). |
Remarks
The value of expression must evaluate to a public property.
The Eval method calls the Eval method using the GetDataItem method to resolve the object reference that the expression is evaluated against.
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.