How to catch none support image

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I want to catch None Support Image before return, but still need help. Please

It doesn't catch Anything, and make my app Crash.

What I have tried:

<pre lang="c#">
 public static ImageBrush GetImage(string source)
{
 if (System.IO.File.Exists(source))
            {
                ImageBrush myBrush = new ImageBrush();
                try
                {
                    myBrush.ImageSource = new BitmapImage(new Uri(source, UriKind.Relative));
                }
                catch
                {
                    myBrush.ImageSource = new BitmapImage(new Uri(Root.DefaultObjectPicture, UriKind.Relative));
                }

                return myBrush;

            }
}
// and caller method
try{
         MyRectangle.Fill = GetImage(@"BrokenImageTest.jpg");
}
catch{}

Posted 22-Nov-17 3:03am

Member 12680324

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Jochen Arndt · Accepted Answer · 2017-11-22T03:24:00

You are not handling exceptions but call instead a function that very probably throws another one in your catch handler.

You should read about exceptions: try-catch (C# Reference) | Microsoft Docs[^].

Then check which exceptions might be thrown by the used functions by reading the function references and handle them.
For your case:
BitmapImage Constructor (Uri) (System.Windows.Media.Imaging)[^] and
Uri Constructor (String, UriKind) (System)[^].

So it must be something like

C#

bool bSuccess = false;
try
{
    // Call function(s) here that might throw exceptions

    // If execution reaches this point, no exceptions occured
    bSuccess = true;
}
// Catch and handle exceptions
catch (UriFormatException e)
{
    // Handle UriFormatException here
}
catch (FileNotFoundException e)
{
    // Handle FileNotFoundException here
}
// Handle more excpetions here as necessary

if (!bSuccess)
{
    // Try a different method which may throw also exceptions that should be handled
}