writing functions in dll (newbie)

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Guest

I have a task to write winform application while writing the functions that
return information, in a dll - for example opening a file. can someone please
give me an example for function that opens a file (openFileDialog) that will
be written in a dll file?

Thanks a lot
 
orit said:
I have a task to write winform application while writing the functions that
return information, in a dll - for example opening a file. can someone
please
give me an example for function that opens a file (openFileDialog) that
will
be written in a dll file?
Click to expand...

Add a reference to "System.Windows.Forms.dll". Very basic sample code:

\\\
Imports System.Windows.Forms
..
..
..
Public Function OpenFile() As String
Dim o As New OpenFileDialog()
If o.ShowDialog = DialogResult.OK Then
OpenFile = o.FileName
End If
o.Dispose()
Return OpenFile
End Function
///
 
Thanks
I still do not completely understand the concept of how to write a general
function in a dll.
the truth is that I write on c# (sorry for not noticing before). can you
please give me the example in c# (with hope that it will be more clear for
me...)

Thanks a lot
 
orit said:
I still do not completely understand the concept of how to write a general
function in a dll.
the truth is that I write on c# (sorry for not noticing before). can you
please give me the example in c# (with hope that it will be more clear for
me...)
Click to expand...

\\\
public string OpenFile()
{
string retval = null;
using (OpenFileDialog o = new OpenFileDialog())
{
if (o.ShowDialog() == DialogResult.OK)
retval = o.FileName;
}
return retval;
}
///

You can add the code above to a class file, then compile the class library
project and use the resulting DLL in other projects.
 
Thanks a lot.

The OpenFileDialog class requires the namespace System.Windows.Forms . The
dll class that I created doesn't know this namespace. how does it suppose to
be?

Thanks again
 
orit said:
The OpenFileDialog class requires the namespace System.Windows.Forms . The
dll class that I created doesn't know this namespace. how does it suppose
to
be?
Click to expand...

Add a reference to "System.Windows.Forms.dll" to your class library project
and import the 'System.Windows.Forms' namespace.
 
Perfect, didn't know that technique.

Thanks

Herfried K. Wagner said:
Add a reference to "System.Windows.Forms.dll" to your class library project
and import the 'System.Windows.Forms' namespace.
Click to expand...
 
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