.net - How to get the associated icon from a network share file

Question

I am using Icon.ExtractAssociatedIcon to get the icon of a file , that a user selects, in an openfiledialog.

THe problem is if the user selects an icon from a network share then the filename property of the openfiledialog is in UNC format and this causes an ArgumentException in ExtractAssocaitedIcon:

Value of '\serversharefilename' is not valid for 'filePath'.

Stack Trace:
   at System.Drawing.Icon.ExtractAssociatedIcon(String filePath, Int32 index)

So my question is given a file specified as \serversharefilename, how do I get the icon?

Note: .NET 2.0

Answer 1

Looking at this with Reflector, it is ultimately calling ExtractAssociatedIcon in shell32.dll.

Have you tried the going around the BCL accessing it via PInvoke?

Sample code (via PInvoke.Net):

[DllImport("shell32.dll", CharSet = CharSet.Unicode)]
static extern IntPtr ExtractAssociatedIcon(IntPtr hInst, StringBuilder lpIconPath,
   out ushort lpiIcon);

 // ... snip
    ushort uicon;
    StringBuilder strB = new StringBuilder(260); // Allocate MAX_PATH chars
    strB.Append(openFileDialog1.FileName);
    IntPtr handle = ExtractAssociatedIcon(IntPtr.Zero, strB, out uicon);
    Icon ico = Icon.FromHandle(handle);

    pictureBox1.Image = ico.ToBitmap();
 // ... snip