jeudi 26 février 2015

Intercept Method/Property call in c#

In the code below I have a class Foo which is called (without an interface) by my main method. There is no backing field or setter for the property, instead it calls a private method. Foo cannot be changes, nor can the usage of foo be changed to an IFoo interface.


- How do I change the value of foo.FooValue?


- Is there anything in the System.Reflection, System.Reflection.Emit, .NET standard libraries etc (unsafe code, whatever) that I can include in a unit test to change the return value?


I appreciate if there is something it's bound to be quite "evil", but I am interested in "evil" answers.



public class Program
{
public static void Main(){

Foo foo = new Foo();
int bar = foo.FooValue;
}
}

public class Foo{

public int FooValue
{
get
{
return this.FooMethod();
}
}

private int FooMethod
{
return 0;
}
}


Related questions:


How to set value of property where there is no setter - Related but unanswered - Maybe the answer is "no", but I'm not convinced by the top answer which merely points out you can't achive this by changing a (non-existent) backing field.


Intercept call to property get method in C# - Interesting. Not sure whether this is my answer and if it is, not sure how it could be used in a unit test.






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