| Author |
Message |
billrob458
Joined: 29 May 2012
Posts: 2
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 Posted: Tue May 29, 2012 4:32 am Post subject: Odd Constructor Initializer |
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This might just be a fluke of the C# disassembler. I'm looking at the ValidationAttribute class of the System.ComponentModel.DataAnnotations (v4).
The ctors look off. I'm pretty sure this is how the code is behaving as the late bound Func<string> around the message is clearly working.
How is "func" passed to the ctor initializer *before* it is declared.
| Code: |
protected ValidationAttribute(string errorMessage) : this(func)
{
Func<string> func = null;
if (func == null)
{
func = () => errorMessage;
}
} |
It would be amazing if we could apply complex default logic to pass to ctor initializer.
I tried doing this and it doesn't compile.
| Code: |
public abstract class Adam
{
protected Adam(Func<bool> myFunc)
{
}
protected Adam()
: this(func)
{
Func<bool> func = null;
if (func == null)
func = () => true;
}
protected Adam(bool errorMessage)
: this(func)
{
Func<bool> func = null;
if (func == null)
{
func = () => errorMessage;
}
}
}
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nick.maidment
Joined: 29 Jan 2010
Posts: 74
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| Posted: Tue May 29, 2012 8:44 am Post subject: |
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The code Reflector is generating is incorrect. It is trying to do the equivalent of the following, which does compile.
public Program(Func<string>x)
{
}
public Program(string errorMessage)
: this(() => errorMessage)
{
}
Ie the stuff to do with the local variable func, is supposed to be happening inside the call to this(…)
By the way, we also have a newer forum here: http://forums.reflector.net/  |
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billrob458
Joined: 29 May 2012
Posts: 2
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| Posted: Tue May 29, 2012 1:54 pm Post subject: |
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| Thanks for the reply Nick. I figured as much that all the logic was inlined. I was hoping there was some special trick we could use to have more complex "default" parameters we could pass to a constructor initializer. |
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