A tool for automatically testing parameters of methods and throwing ArgumentNullException for .net/VS?

When I write code I have this strange habit to start my methods with code that just throws exceptions like this

public WhateverType MethodName(CrazyObjectType crazyObject, string para2){
    if(crazyObject == null){
        throw new ArgumentNullException("crazyObject");
    }
    if(param2 == null){
        throw new ArgumentNullException("param2");
    }
    if(para2.Lenght > 32){
        throw new ArgumentOutOfBoundsException("para2");
    }

    ...
}

Consider s开发者_StackOverflow中文版ome methods have 6 parameters, non of them is allowed to be null and some of them are strings that might not be empty or longer then some value. You can imagine that before I get to actual method logic I write quite some code + my class will be harder to read.

Is there any tool/VS plugin/Resharper plugin/annotation/code snippet for me to not to have to write all this repetitive code ?

Ideal solution would be some declarative annotation something like:

[NotNull("crazyObject, param2")] [StringLenght("para2", 0, 32)]
public WhateverType MethodName(CrazyObjectType crazyObject, string para2){
    ...
}

• some VS/Resharper plugin that would allow refractoring such parameters so when I rename/refractor some parameter annotation will be synchronized automatically ?

And my ideal image goes even further and I imagine that I can have GUI to automatize process so that I select method click somewhere, check some check boxes for parameters that should not be null and annotation will be generated for me.

Does something like this exist ?

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Note: I guess I can always create code snipper that will generate the code but declarative approach and GUI generator would me much better.

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EDIT: Saying "Consider some methods have 6 parameters" is just an example - I don't think I have many if any such methods. Instead I should have written "consider you have a lot of methods that throw some 3-4 ArgumentExceptions".

EDIT2: Bad terminology. I realized that what I call "annotation" everywhere in this question and my comments should be probably called "attributes" in .NET if I remember it correctly from my .NET classes.

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While it's not strictly declarative, I think you should probably look at Code Contracts.

For a bizarre and not-really-recommended way of making null argument testing cheaper, have a look at this blog post. That only covers null argument checking though - not other kinds of validity.

By the way, there's nothing strange about the first part of a method just performing argument validation. It's entirely reasonable.

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I agree with Jon on using Code Contracts. Something else you might find interesting is Fluent Validation.