ExposedObject

Fast dynamic wrapper for accessing hidden methods and fields of .Net objects. Uses 4.0 dynamic feature to allow seamless access to non-public object members. Facilitates white-box unit testing, exposes APIs that should be public and allows construction of elaborate hacks. Should not kill your cat provided you are careful. Available on NuGet.

Usage examples

Handling private instance methods, fields and properties on a visible type:

// create an Exposed instance from a ClassWithHiddenMethods instance
dynamic exposed = Exposed.From(new ClassWithHiddenMethods());
// calling a private method
string password = exposed.GeneratePassword(8);
// reading a private field
int privateFieldValue = exposed.internalCount;
// setting a private field
exposed.internalCount = privateFieldValue * 2;
// reading a protected property
char protectedPropertyValue = exposed.InternalData;

Accessing private field on a hidden type:

// get the Type via reflection
Type hiddenClass = Type.GetType("TestSubjects.HiddenClass, TestSubjects");
// call the parameterless constructor of a hidden type
dynamic exposed = Exposed.New(hiddenClass);
string password = exposed.password;

Accessing internal static method from type:

dynamic exposed = Exposed.From(typeof(ClassWithInternalStaticMethod));
decimal convertValue = exposed.ConvertValue(8);

TODO:

Ideas borrowed from:

Bug squash: Testing private methods with C# 4.0 - starting idea
Igor Ostrovsky: Use C# dynamic typing to conveniently access internals of an object - convenient API
Miguel de Icaza: C# 4's Dynamic in Mono - performant dynamic object implementation using GetMetaObject()

skolima/ExposedObject

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