How to check the permission to write to a directory or file- How do you check for permissions to write to a directory or file?

problem ：

I got a program that writes some data to a file using a method like the one below. I have a program , Use the method shown below to write some data to the file .

public void ExportToFile(string filename){     using(FileStream fstream = new FileStream(filename,FileMode.Create))     using (TextWriter writer = new StreamWriter(fstream))     {         // try catch block for write permissions          writer.WriteLine(text);     }}

When running the program I get an error: An error occurred while running the program ：

Unhandled Exception: System.UnauthorizedAccessException: Access to the path 'mypath' is denied. Unhandled exception ：System.UnauthorizedAccessException： Deny access to path 'mypath'.at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, nt32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions ptions, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy) at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolea bFromProxy) stay System.IO .__ Error.WinIOError（Int32 errorCode,String maybeFullPath）at System.IO.FileStream.Init（String path,FileMode mode,FileAccess access,nt32 rights,Boolean useRights,FileShare share,Int32 bufferSize,FileOptions ptions,SECURITY_ATTRIBUTES secAttrs） System.IO.FileStream..ctor Medium String String msgPath,Boolean bFromProxy（ String path ,FileMode Pattern ,FileAccess visit FileShare share ,Int32 bufferSize,FileOptions Options , character string msgPath,Boolea bFromProxy）

Question: What code do I need to catch this and how do I grant the access? problem ： What code do I need to use to get this information and how to grant access ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/Xyj