Checking for a resource file

Question

I have an image file in the project folder in visual studio, and it is configured to create an action resource, so it is included in my exe file. I can link to this file in xaml without problems, for example <.Image Source = "images / myimage.png"> and it works.

But if I try to verify the existence of the file, then with File.exists ("images / myimage.png") it always returns false. What am I doing wrong here?

Answer 1

If you do not want it to be associated with the output folder additionally - you do not need to do anything. It is built into your exe, no need to check. It will always be true.

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Ok, I understand, because you are dynamically creating the name of the embedded resource that you want to check.

See here: WPF - resource check exists without structured exception handling

They mostly check Assembly.GetExecutingAssembly().GetManifestResourceNames()

You can use this as a starting point. But keep in mind that the name of the resource is not images / myimage.png, but is built from your namespace, such as YourApp.images.myimage.png. You might want to take a look at the contents of the embedded resourceNames array from this answer.

Answer 2

Have the Copy to Output property set to Always? and make sure you use the correct path. The path of your executable assembly can be found using the following code:

  private string GetExecutingAssemblyPath() { string codeBase = Assembly.GetExecutingAssembly().CodeBase; UriBuilder uri = new UriBuilder(codeBase); string path = Uri.UnescapeDataString(uri.Path); return Path.GetDirectoryName(path); } 

Greetings.

Answer 3

Xamarin.Forms

From the working code, it is checked whether the auto-generated file name exists in the embedded resources in the shared project (as described here https://developer.xamarin.com/guides/xamarin-forms/user-interface/images/#Embedded_Images )

  var assembly = typeof(App).GetTypeInfo().Assembly; var AssemblyName = assembly.GetName().Name; var generatedFilename = AssemblyName+".Images.flags.flag_" + item.CountryCode?.ToLower() + @".png"; bool found = false; foreach (var res in assembly.GetManifestResourceNames()) { if (res == generatedFilename) { found = true; break; } } if (found) UseGeneratedFilename(); else UseSomeOtherPlaceholderImage;