ConnectionStringsExpressionEditor::EvaluateExpression Method
This member overrides ExpressionEditor::EvaluateExpression(String, Object, Type, IServiceProvider), and more complete documentation might be available in that topic.
Evaluates a connection string expression and provides the design-time value for a control property.
Assembly: System.Design (in System.Design.dll)
public: virtual Object^ EvaluateExpression( String^ expression, Object^ parseTimeData, Type^ propertyType, IServiceProvider^ serviceProvider ) override
Parameters
- expression
- Type: System::String
A connection string expression to evaluate. The expression does not include the ConnectionStrings expression prefix.
- parseTimeData
- Type: System::Object
An object containing additional parsing information for evaluating the expression.
- propertyType
- Type: System::Type
The type of the control property.
- serviceProvider
- Type: System::IServiceProvider
A service provider implementation supplied by the designer host, used to obtain additional design-time services.
Return Value
Type: System::ObjectThe object referenced by the evaluated expression string if the expression evaluation succeeded; otherwise, nullptr.
The EvaluateExpression method looks up the connection name and type specified by expression, and then returns the connection.
The visual designer uses the EvaluateExpression method to evaluate a connection string expression and provide the design-time value for an associated control property. The visual designer uses the ConnectionStringsExpressionBuilder::ParseExpression method to parse the expression string at design time, and then calls the EvaluateExpression method with the parsed expression data. The visual designer uses the evaluated expression result to assign control property values that are rendered on the design surface.
At run time, the page parser uses the EvaluateExpression and GetCodeExpression methods of the corresponding ConnectionStringsExpressionBuilder implementation to evaluate an expression and provide the run-time value for an associated control property.
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.
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.