How do WF4 parse the Expressions?

How do WF4 parse expressions and return the values.

for example the If activity has the Condition attribute that we can write expression like [ true = true ] or [ "str" = "str" ] or guids... what is the class responsible for this parsing?

I noticed that when we put the [] so开发者_高级运维 the engine will directly parse the content of the brackets, in other world what is the class that parses the VB expression in WF4.

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The class you are looking for is VisualBasicValue< TResult>.