This example demonstrates how to use PostSharp Architecture Framework to validate, at build time, that the value passed to a parameter is valid string in a resource name.
The constraint is implemented by the ValidateResourceStringAttribute class. It is derived from ReferentialConstraint
because we need to validate the usage of the method, not the method itself.
The method ValidateConstraint validates that the [ValidateResourceString] attribute is used on a parameter of type string, and checks that the resource
exists in the current project.
The method ValidateCode validates the values assigned to this parameter. We first use ReflectionSearch.GetMethodsUsingDeclaration to get a list of
all methods invoking the validated method. Then, we use a SyntaxTreeVisitor to analyze the body of these methods.