string to ref string error ??[Resolved]

This is weird . Below, the method signature is marked as ByRef . I exported this class to dll file . It works fine in VB. In C# , it gives me two strange errors .They say : Argument '1': cannot convert from 'string' to 'ref string'
and
Argument '2': cannot convert from 'string' to 'ref string'

VB Code:

Public Shared Function FindFile(ByRef RootPath As String, ByRef FileName As String) As String

I used it like this :

Code:

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MessageBox.Show(FindFileViaAPI.FileClass.FindFile("c:\\" ,"setup.exe"));

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Anyone knows why ?

Have you tryed to this?:

Code:

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MessageBox.Show(FindFileViaAPI.FileClass.FindFile(@"c:\\" ,"setup.exe"));

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Hope thats it,

Stephan

have you tried adding ref, eg:

VB Code:

MessageBox.Show(FindFileViaAPI.FileClass.FindFile([COLOR=blue]ref[/color] "c:\\" ,[COLOR=blue]ref[/color] "setup.exe"));

What dynamic_sysop said. See, in C# you have to use the ref keyword when passing in a value type variable by reference. Its a little different with reference types.

Quote:

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Originally posted by Sgt-Peppa
Have you tryed to this?:

Code:

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MessageBox.Show(FindFileViaAPI.FileClass.FindFile(@"c:\\" ,"setup.exe"));

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Stephan

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The same error arised again .

and

When I tried what dynamic_sysop said , it gives this error :
A ref or out argument must be an lvalue


:confused:

Try this

Code:

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string _rootPath = @"C:\";
string _fileName = "setup.exe";

MessageBox.Show(FindFileViaAPI.FileClass.FindFile(ref _rootPath, ref _fileName));

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Thanks , this works well . Do you know why ?

As to what the error said, you have to use an lvalue.

Cool .:)