System.UnauthorizedAccessException when creating file in UWP project

Question

The following code can generate c:\temp\MyTest.bin successfully in Console project. But it failed to generate c:\temp\MyTest.bin in UWP project. Do you have any suggestion to fix this issue?

byte[] bytes = { 1, 2, 3 };
            string path = @"c:\temp\MyTest.bin";
            CFile.WriteBinaryFile(path, bytes);

        public static int WriteBinaryFile(string filePath, byte[] data)

Answer 1

Hi @longevity uyl ,

Welcome to Microsoft Q&A!

Different from the C# console app, UWP runs in the sandbox and cannot directly access external files. About how to create file in UWP, it is recommended that you refer to this document Create, write, and read a file.

Thank you.

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