Evaluates data-binding expressions at run time and formats the result as a string.
Public Shared Function Eval ( _ container As Object, _ expression As String, _ format As String _ ) As String
Dim container As Object Dim expression As String Dim format As String Dim returnValue As String returnValue = DataBinder.Eval(container, _ expression, format)
public static string Eval( Object container, string expression, string format )
public: static String^ Eval( Object^ container, String^ expression, String^ format )
public static function Eval( container : Object, expression : String, format : String ) : String
The value of expression must evaluate to a public property.
For more information about format strings in the .NET Framework, see Formatting Overview.
This method is automatically called when you create data bindings in a rapid application development (RAD) designer such as Visual Studio. You can also use it declaratively to convert the Object resulting from the data-binding expression to a String. To use the method declaratively, use the <%# %> expression syntax, as used in standard ASP.NET data binding.
This method is particularly useful when binding data to controls that are in a templated list.
Because this method performs late-bound evaluation, using reflection at run time, it can cause performance to noticeably slow compared to standard ASP.NET data-binding syntax. Use this method judiciously, particularly when string formatting is not required.
For any of the list Web controls, such as GridView, DetailsView, DataList, or Repeater, container should be Container.DataItem. If you are binding against the page, container should be Page.
The following code example demonstrates how to use the Eval method declaratively to bind to a Price field. This example uses container syntax that assumes you are using one of the list Web server controls. The format parameter contains an expression that formats the number as a locale-specific currency string.
<%# DataBinder.Eval(Container.DataItem, "Price", "{0:c}") %>
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