ConnectionStringsExpressionBuilder::EvaluateExpression Method (Object^, BoundPropertyEntry^, Object^, ExpressionBuilderContext^)
Returns a value from the <connectionStrings> section of the Web.config file.
Assembly: System.Web (in System.Web.dll)
public: virtual Object^ EvaluateExpression( Object^ target, BoundPropertyEntry^ entry, Object^ parsedData, ExpressionBuilderContext^ context ) override
Parameters
- target
-
Type:
System::Object^
The object that contains the expression.
- entry
-
Type:
System.Web.UI::BoundPropertyEntry^
The property to which the expression is bound.
- parsedData
-
Type:
System::Object^
The object that represents parsed data as returned by ParseExpression.
- context
-
Type:
System.Web.Compilation::ExpressionBuilderContext^
Properties for the control or page.
Return Value
Type: System::Object^The Object associated with a key in the <connectionStrings> section of the Web.config file.
| Exception | Condition |
|---|---|
| InvalidOperationException | The connection string name could not be found in the Web.config file. |
This method is called when an expression of the form <%$ ConnectionStrings: secureConnectionString %> is encountered in a page that is not compiled. It retrieves the appropriate value from the <connectionStrings> section of the Web.config file. This method overrides the EvaluateExpression method by calling the GetConnectionString method if a connection string is included in the parsedData parameter, or by calling the GetConnectionStringProviderName method if a connection string is not included in the parsedData parameter.
Available since 2.0