Pros and Cons of using this keyword in c#

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In programming you can use the this keyword


or just


What is the best practice?

Some benefits I can see is that using this makes it easier to see in intellisense and makes it easier to understand that it is a property.

Currently I don't use this... I read in some article somewhere that the guy removed all the references, but I don't remember why.

What are the pros and cons of using the this keyword?

Using this systematically will mean that you don't fall into a trap of referring to a local variable when in fact you want a member of this.

The downside: using this will make your code more verbose.

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The only cons are that it is more typing. Using this (esp. consistently) also precludes, for example, using a parameter when you meant to use a property, e.g. a method f(Textbox textbox) => {textbox = textbox} when you meant to say this.Textbox = textbox. Using it consistently not only makes it impossible to do so but also makes it stand out when you possibly could have.

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It's a matter of preference, really. Sometimes you have to use the this keyword, in cases like this:

private string Foo;
public void Bar(string Foo)
    this.Foo = Foo;

Not having the this will result in a bug where the parameter just sets itself to itself. It's less verbose, but some may say it's also less clear (hence preference).

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I prefer leaving out this. because it's less typing and less clutter and only use it when necessary because the identifier would be ambiguous otherwise.

As a sidenote I like the way member acces is handled in Cobra. It requires them to be prefixed with a . (or _ for privates). So you'd use .member=parameter. And the first is obviously a member and the second a local variable. An elegant way to remove the ambiguity without becoming verbose.

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I've just started to remove this. qualification from a codebase which has turned up a consequence:

Extension methods must have a this. prefix!

Thus, use of extension methods isn't transparent unless this. qualification is used generally.

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  • The answers here are relevant as well:…
  • This is a pros vs cons question not a how to. It is not a duplicate.
  • The title is bad but it is not a duplicate of the above.
  • Parameter ambiguity like this is just asking for trouble. Style guidelines for .NET suggest camelCase for parameters.
  • I agree, I wasn't endorsing it - just pointing out that there are cases where it's actually needed, not just a style preference.
  • Why? our entire development team (including me) leaves it out as well. This was never enforced as a coding standard it just happened. Maybe due to the use of the underscore _privatemember
  • Lazyness. And since I use prefixed private members too the danger of mixing parameters and members is avoided too.