Use SecurityManager to check the FileIOPermissionAccess.Write
using System;
using System.Security;
using System.Security.Permissions;
class MainClass {
public static void Main() {
FileIOPermission fileIOPerm = new FileIOPermission(FileIOPermissionAccess.Write, @"C:\Data");
Console.WriteLine(SecurityManager.IsGranted(fileIOPerm));
}
}
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