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C# equivalent of VB's With keyword

, 27 May 2011
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VB has a With keyword that you can use to save typing same variables name over and over again. Here's a similar workaround for C#
There’s no with keyword in C#, like Visual Basic. So you end up writing code like this:
this.StatusProgressBar.IsIndeterminate = false;
this.StatusProgressBar.Visibility = Visibility.Visible;
this.StatusProgressBar.Minimum = 0;
this.StatusProgressBar.Maximum = 100;
this.StatusProgressBar.Value = percentage;
Here’s a workaround to this:
this.StatusProgressBar.Use(p =>
{
  p.IsIndeterminate = false;
  p.Visibility = Visibility.Visible;
  p.Minimum = 0;
  p.Maximum = 100;
  p.Value = percentage;
});
This saves you repeatedly typing the same class instance or control name over and over again. It also makes code more readable since it clearly says that you are working with a progress bar control within the block. It you are setting properties of several controls one after another, it’s easier to read such code this way since you will have dedicated block for each control.
It’s a very simple one line extension method that enables it:
public static void Use<T>(this T item, Action<T> work)
{
    work(item);
}
You could argue that you can just do this:
var p = this.StatusProgressBar;
p.IsIndeterminate = false;
p.Visibility = Visibility.Visible;
p.Minimum = 0;
p.Maximum = 100;
p.Value = percentage;
But it’s not elegant. You are introducing a variable “p” in the local scope of the whole function. This goes against naming conventions. Morever, you can’t limit the scope of “p” within a certain place in the function.

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Comments and Discussions

 
GeneralMy vote of 5 PinmemberMichael Haephrati19-Sep-12 6:08 
GeneralIs it really necessary? Pinmemberlewax0010-Apr-12 8:12 
First off, "this" is implied, so you don't need to type it at all. Secondly, with proper use of VS's autocomplete you really won't be saving anymore than a few keystrokes. In the end you save a couple seconds of typing and create a slower program, so why bother at all?
QuestionI prefer the alternative PinmemberGParkings6-Mar-12 23:54 
GeneralRe: It's true that it'll be slower as you're creating a delegate... PinmemberRiz Thon23-May-11 20:22 
GeneralReason for my vote of 5 Good alternative. PinmemberProEnggSoft24-Feb-12 19:43 
GeneralReason for my vote of 5 Good summary. Sad that C# did not im... PinmemberRoy from Detroit21-Feb-12 4:12 
GeneralReason for my vote of 3 performance impact for syntactic sug... Pinmemberjohannesnestler15-Feb-12 4:09 
GeneralMuch less efficient than the VB version, as it introduces an... PinmemberIan Shlasko1-Jun-11 3:11 
GeneralGood and safe option for those who prefer such coding style.... PinmemberAll Time Programming30-May-11 20:52 
GeneralInteresting though I'd prefer to use the alternate (and have... Pinmemberdigital man26-May-11 4:48 

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