RuleValidation Class
Validates expression conditions.
Assembly: System.Workflow.Activities (in System.Workflow.Activities.dll)
| Name | Description | |
|---|---|---|
![]() | RuleValidation(Activity^, ITypeProvider^, Boolean) | Initializes a new instance of the RuleValidation class using the specified Activity and the type provider. |
![]() | RuleValidation(Type^, ITypeProvider^) |
| Name | Description | |
|---|---|---|
![]() | Equals(Object^) | Determines whether the specified object is equal to the current object.(Inherited from Object.) |
![]() | ExpressionInfo(CodeExpression^) | Determines the type of the code expression. |
![]() | Finalize() | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.) |
![]() | GetHashCode() | Serves as the default hash function. (Inherited from Object.) |
![]() | GetType() | |
![]() | MemberwiseClone() | |
![]() | PopParentExpression() | Removes and returns the parent expressions at the top of the Stack. |
![]() | PushParentExpression(CodeExpression^) | Inserts an object at the top of the Stack. |
![]() | ToString() | Returns a string that represents the current object.(Inherited from Object.) |
The following code creates an invalid condition. It then attempts to validate the condition, and displays any errors that result.
// Create an invalid condition ("abc" < true). CodeBinaryOperatorExpression invalidCompare = new CodeBinaryOperatorExpression(); invalidCompare.Left = new CodePrimitiveExpression("abc"); invalidCompare.Operator = CodeBinaryOperatorType.LessThan; invalidCompare.Right = new CodePrimitiveExpression(true); RuleExpressionCondition condition = new RuleExpressionCondition(); condition.Expression = invalidCompare; // Create a validator for this condition. // We are not using "this" in the condition, so the type is not used. RuleValidation validation = new RuleValidation(this.GetType(), null); // See whether the condition validates. if (!condition.Validate(validation)) { // There were errors, so display them. foreach (ValidationError error in validation.Errors) { Console.WriteLine(error.ErrorText); } }
Running this code produces the following error:
Relational operator "LessThan" cannot be used on operands of types "string" and "bool".
Available since 3.0
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.


