Converting some C# to VB

[mark007]

Trying to understand some C# code on the net:

 

 

if ((string1 = string2) != null) {

 

 

}

 

 

What is this saying?

 

Translators recommend:

 

if not (string1=string2) is nothing then

 

end if

 

Which is incorrect as string1=string2 is boolean.

 

I therefore thought it might be:

 

if string1<>string2 then

 

but it seems to be doing more than this. Any ideas?

 

:)

[ALEX_0077]

If (Not (string1 = string2)) Then
     'some code here...
End If

 

Trying to understand some C# code on the net:

 

 

if ((string1 = string2) != null) {

 

 

}

 

 

What is this saying?

 

Translators recommend:

 

if not (string1=string2) is nothing then

 

end if

 

Which is incorrect as string1=string2 is boolean.

 

I therefore thought it might be:

 

if string1<>string2 then

 

but it seems to be doing more than this. Any ideas?

 

:)

[mark007]

What the difference between this:

 

If (Not (string1 = string2)) Then

'some code here...

End If

 

and

 

If (string1 <> string2) Then

'some code here...

End If

 

?

[ALEX_0077]

absolutly nothing. The <> method is just less code.

 

What the difference between this:

 

If (Not (string1 = string2)) Then

'some code here...

End If

 

and

 

If (string1 <> string2) Then

'some code here...

End If

 

?

[IngisKahn]

The correct translation of

if ((string1 = string2) != null)
{
   //....
}

is:

string1 = string2
If Not string1 Is Nothing Then
   '...
End If

[mark007]

In that case I've tried that and it isn't the exact translation. Any more ideas?

[mark007]

Ah, thanks IgisKhan, I shall try that!

 

:)

[mark007]

I guess C# is similar to PHP in that it has == for comparison and = for assignment. Should have realised. Thanks alot though.

 

:)

[ALEX_0077]

The correct translation of

if ((string1 = string2) != null)
{
   //....
}

is:

string1 = string2
If Not string1 Is Nothing Then
   '...
End If

 

Thats right. = is not the same as == (duh! ) :D

[Joe Mamma]

Which is incorrect as string1=string2 is boolean.

one of the many inadequacies of VB.NOT (context sensitive operators). . .

 

In c#, the assignment falls through so you can initialize things like:

 

 

string s, s1;
string s2 = s1 = s = "foobar";
int i, i1;
int i2 = i1 = i = 1;
MyObject mo, mo1; 
MyObject mo2 = mo1 = mo = new MyObject(); 

 

with those statements:

s, s1, and s2 all contain "Foobar". . .

i, i1, and i2 all contain 1. . .

 

and

mo, mo1 and mo2 all contain a reference to the same instance of a MyObject.

 

that being said. . .

 

if ((string1 = string2) != null)
{
//....
}

 

reads:

 

If, after assigning string2 to string1, the value assigned to string1 is not null then. . .

 

in vb it would be:

 

string1 = string2

if ( not (string1 is nothing) ) then

 

end if. . .

 

Also keep in mind -

 

dim mystring as String = nothing

dim test as bool = mystring = string.Empty

 

The value of test is false.