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C# equivalent of VB's With keyword

CaldasGSM

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4.92/5 (12 votes)

27 May 2011CPOL

17K

4

5

You are introducing a variable “p” in the local scope of the whole function :snot really.. you know you can use brackets anywhere inside the code to define subscopes, don't you:{var p = this.StatusProgressBar;p.IsIndeterminate = false;p.Visibility = Visibility.Visible;p.Minimum =...

You are introducing a variable “p” in the local scope of the whole function :s
not really.. you know you can use brackets anywhere inside the code to define subscopes, don't you:

MIDL

{
var p = this.StatusProgressBar;
p.IsIndeterminate = false;
p.Visibility = Visibility.Visible;
p.Minimum = 0;
p.Maximum = 100;
p.Value = percentage;
}

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Written By

CaldasGSM

Software Developer

Portugal

From the age of 15 I started programing in QBasic at home after several jobs I realized that what I wanted was to work with computers, so I joined a IT company, originally as a web designer, but thanks to my self learning abilities I made my way into the programmers team. Today I know VB, VBScript, Javascript, HTML, SQL , C# and C++... even if I never went to college.. Smile | :)

Smile | :)

Comments and Discussions

Only works for reference types!

Andreas Gieriet20-Mar-13 4:37

Andreas Gieriet

20-Mar-13 4:37

Caution: this only works for reference types (i.e. for class instances).
Structs will fail, since the assignment to p creates a copy of the original value.
C#does not know the concept of "alias", so this tip may be also a trap Frown | :-(

Frown | :-(

E.g. if you tweak with DateTime this will fail (MyDateTime will *not* be modified):

{<br />
  var p = myInst.MySubInst.MyDateTime;<br />
  p.AddHours(h);<br />
  p.AddMinutes(m);<br />
  p.AddSeconds(s);<br />
}

As long as you *know* that you have a reference type, it's fine.

Cheers
Andi

Sorry for my bad english. I'm trying to use this tip and I g...

José Temporini (Member 2969596)16-Feb-12 11:42

José Temporini (Member 2969596)

16-Feb-12 11:42

Sorry for my bad english. I'm trying to use this tip and I get the error "Error 1 No se puede encontrar el tipo o el nombre de espacio de nombres 'var' (¿falta una directiva using o una referencia de ensamblado?)". What is my error???

Re: the "var" keyword only exists in c# 3.0.. you are probably u...

CaldasGSM16-Feb-12 22:52

16-Feb-12 22:52

the "var" keyword only exists in c# 3.0.. you are probably using c# 2.0 or lower.. in that case you must declare the variable with its class type
"ProgressBar p = this.StatusProgressBar;"

Reason for my vote of 5 Simple and efficient

John Brett6-Jan-12 4:49

6-Jan-12 4:49

Reason for my vote of 5
Simple and efficient

Reason for my vote of 5 I think it is the best way to do it....

Philippe Mori31-May-11 12:45

31-May-11 12:45

Reason for my vote of 5
I think it is the best way to do it. As an added benefit, if the property is somehow complex to evaluate, the added variable could help performance.

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