c# – Xamarin iOS System.UnauthorizedAccessException: Entry to the trail is denied studying shared recordsdata

System.UnauthorizedAccessException is triggered in our Xamarin iOS app when studying a shared file, both from one other app or by a public folder.

This error is new and began after updating from VS2019 to VS2022 (Home windows). There have been additionally numerous macOS updates (now Ventura 13.7). The sharing code works tremendous however there appears to be a safety setting lacking – hopefuly a easy oversight.

Under are snippets from the app. Any ideas on the place to start out searching for the trigger?

data.plist:

    CFBundleTypeName
    Public plain-text
    LSItemContentTypes
    
        public.plain-text
    

AppDelegate.cs:

public override bool OpenUrl(UIApplication app, NSUrl url, NSDictionary choices)
{
    MyModule mm = new MyModule();
    mm.AddFile(url.Path);
    return true;
}

MyModule.cs:

public class MyModule
{
    public void AddFile(string url)
    {
        ...
        var textual content = File.ReadAllText(url); << Exception line >>
        ...
    }
}

Exception message:

{System.UnauthorizedAccessException: Entry to the trail "/personal/var/cell/Containers/Shared/AppGroup/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/File Supplier Storage/xxxxx.txt" is denied.
  at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess entry, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean nameless, System.IO.FileOptions choices) [0x0026e] in /Library/Frameworks/Xamarin.iOS.framework/Variations/Present/src/Xamarin.iOS/mcs/class/corlib/System.IO/FileStream.cs:274 
  at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess entry, System.IO.FileShare share, System.Int32 bufferSize, System.IO.FileOptions choices) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Variations/Present/src/Xamarin.iOS/mcs/class/corlib/System.IO/FileStream.cs:106 
  at System.IO.StreamReader..ctor (System.String path, System.Textual content.Encoding encoding, System.Boolean detectEncodingFromByteOrderMarks, System.Int32 bufferSize) [0x00055] in /Library/Frameworks/Xamarin.iOS.framework/Variations/Present/src/Xamarin.iOS/exterior/corefx/src/Widespread/src/CoreLib/System/IO/StreamReader.cs:182 
  at System.IO.StreamReader..ctor (System.String path, System.Textual content.Encoding encoding, System.Boolean detectEncodingFromByteOrderMarks) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Variations/Present/src/Xamarin.iOS/exterior/corefx/src/Widespread/src/CoreLib/System/IO/StreamReader.cs:167 
  at System.IO.File.InternalReadAllText (System.String path, System.Textual content.Encoding encoding) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Variations/Present/src/Xamarin.iOS/exterior/corefx/src/System.IO.FileSystem/src/System/IO/File.cs:303 
  at System.IO.File.ReadAllText (System.String path) [0x00026] in /Library/Frameworks/Xamarin.iOS.framework/Variations/Present/src/Xamarin.iOS/exterior/corefx/src/System.IO.FileSystem/src/System/IO/File.cs:282 
  at [App].MyModule.AddFile (System.String fullPath) [0x00002] in C:xxxx...xxxx.cs:187 }