Field is never assigned to, and will always have its default value

[Guest]

private struct MySTRUCT
{
public IntPtr hwndMyObj;
public Int32 idMyObj;
public Int32 MyCode;
}
In Vb.Net 2005 code above, I am getting a warning message
"MyProj.MyClass.MySTRUCT.hwndMyObj is never assigned to,and will always have
its default value."

The same message for idMyObj and MyCode. How do I resolve it?

 

[Guest]

My apology; it is C# 2005 code.

 

[Stoitcho Goutsev \(100\)]

Shayaan,

That is because you are using public fileds. the comiler always complains
about public or internal unasigned fileds.

Wrap them in properties; it will make the compiler happy.


struct MySTRUCT
{
private IntPtr hwndMyObj;
private Int32 myCode;
private Int32 idMyObj;

public IntPtr HwndMyObj
{
get { return hwndMyObj; }
set { hwndMyObj = value; }
}

public Int32 IdMyObj
{
get { return idMyObj; }
set { idMyObj = value; }
}

public Int32 MyCode
{
get { return myCode; }
set { myCode = value; }
}

}

 

[Guest]

Stoitcho,
Now I get the following errors on lines marked with 1, 2 and 3

1. The type 'MyProj.MyClass.MySTRUCT' already contains a definition for
'HwndMyObj'
2. The type 'MyProj.MyClass.MySTRUCT' already contains a definition for
'IdMyObj'
3. The type 'MyProj.MyClass.MySTRUCT' already contains a definition for
'MyCode'

struct MySTRUCT
{
private IntPtr hwndMyObj;
private Int32 myCode;
private Int32 idMyObj;

1. public IntPtr HwndMyObj
{
get { return hwndMyObj; }
set { hwndMyObj = value; }
}

2. public Int32 IdMyObj
{
get { return idMyObj; }
set { idMyObj = value; }
}

3. public Int32 MyCode
{
get { return myCode; }
set { myCode = value; }
}

}

 

[Christof Nordiek]

The code compiles fine on my machine (though i had to add using System;

from the error messages i suppose that you defined
private IntPtr HwndMyObj;
instead of
private IntPtr hwndMyObj;

look at the capital vs. small 'h' in th identifier.

convention is:
public properties beginn with capital letters.
private fields begin with small letters.

 

[Stoitcho Goutsev \(100\)]

Shayaan,

Make sure that the property names and their backup fields have different
name. In my example the fileds start with small letters and the properties
with capitals.