HELP ME!! An exception of type 'System.IO.IOException' occurred in mscorlib.dll but was not handled in user code

Question

1.00/5 (1 vote)

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.NET3.0

Hi,i am new to this technology please help me.in my mvc project,i am developing a web API projects when i run the program i am getting this error

C#

An exception of type 'System.IO.IOException' occurred in mscorlib.dll but was not handled in user code

Additional information: The device is not ready.

here error comes

C#

public SafeDirectoryCatalog(string directory)
      {
          var files = Directory.EnumerateFiles(directory, "*.dll", SearchOption.AllDirectories);//ERROR HERE

          this.catalog = new AggregateCatalog();

          foreach (var file in files)
          {
              try
              {
                  var asmCat = new AssemblyCatalog(file);

                  ////Force MEF to load the plugin and figure out if there are any exports
                  // good assemblies will not throw the RTLE exception and can be added to the catalog
                  if (asmCat.Parts.ToList().Count > 0)
                  {
                      this.catalog.Catalogs.Add(asmCat);
                  }
              }

C#

Source Error: 


Line 32:         public SafeDirectoryCatalog(string directory)
Line 33:         {
Line 34:             var files = Directory.EnumerateFiles(directory, "*.dll", SearchOption.AllDirectories);
Line 35: 
Line 36:             this.catalog = new AggregateCatalog();

Source File: C:\ProjectVI\Code\BA\ProjectVI.Api\Install\SafeDirectoryCatalog.cs    Line: 34 

Stack Trace: 


[IOException: The device is not ready.
]
   System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) +11185413
   System.IO.FileSystemEnumerableIterator`1.CommonInit() +241
   System.IO.FileSystemEnumerableIterator`1..ctor(String path, String originalUserPath, String searchPattern, SearchOption searchOption, SearchResultHandler`1 resultHandler, Boolean checkHost) +445
   System.IO.Directory.EnumerateFiles(String path, String searchPattern, SearchOption searchOption) +96
   ProjectVI.Api.Install.SafeDirectoryCatalog..ctor(String directory) in C:\ProjectVI\Code\BA\ProjectVI.Api\Install\SafeDirectoryCatalog.cs:34
   ProjectVI.Api.Install.MefConfig.Register() in C:\ProjectVI\Code\BA\ProjectVI.Api\Install\MefConfig.cs:28
   ProjectVI.Api.WebApiApplication.Application_Start() in C:\ProjectVI\Code\BA\ProjectVI.Api\Global.asax.cs:30

[HttpException (0x80004005): The device is not ready.
]
   System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +9916673
   System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +118
   System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +172
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +336
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +296

[HttpException (0x80004005): The device is not ready.
]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +9930568
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +101
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +254

Posted 16-Dec-15 21:58pm

Manidas Payyoli

Updated 18-Sep-19 22:30pm

v2

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Comments

phil.o 17-Dec-15 4:04am

What is the value of the directory parameter when exception is thrown?

[no name] 17-Dec-15 4:07am

D:\NGN\MVC\Dev Code\libs\api-getting this text

phil.o 17-Dec-15 4:11am

And where does this value come from? Is this path a valid one on the machine this code is executing?

[no name] 17-Dec-15 4:14am

i didnt get u.pls chek my updated question..how can i find the value of the directory parameter when exception is thrown

phil.o 17-Dec-15 4:59am

"The device is not ready" means the path in the directory variable is not reachable on the machine the code is executing on.
In clear text, the "D:\NGN\MVC\Dev Code\libs\api" path is not a valid path on the server on which the assembly is run. It may be a valid path on your local/development machine, but it's not a valid path on the server.

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Ebenezar John Paul · Accepted Answer · 2015-12-16T23:13:00

Here exceptions occur when,

* The specified path/searchoption is not a valid one.

* You are trying to access an unmapped network location.

* You do not have the persmission.

I have taken a sample from the microsoft website. Just insert the following code into your function.

C#

string sourceDirectory = @"C:\current"; // Replace this path with your local folder path.
            
string archiveDirectory = @"C:\archive"; // Replace this path with your local folder path.

           
            try
            {
                var txtFiles = Directory.EnumerateFiles(sourceDirectory, "*.txt", SearchOption.AllDirectories);

                foreach (string currentFile in txtFiles)
                {
                    string fileName = currentFile.Substring(sourceDirectory.Length + 1);
                    Directory.Move(currentFile, Path.Combine(archiveDirectory, fileName));
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }

Now debug your application and see what happens. If it runs correctly, then just re-check your old argument directory and give a valid path; then you are good to go.

In case if you catch an error in these blocks, have a debug point inside the catch block and see what type of exception is thrown.

<br />
Path Invalid -> ArgumentException / ArgumentNullException /                                 DirectoryNotFoundException / IOException /  PathTooLongException

Access Denied -> SecurityException / UnauthorizedAccessException

SearchOption Invalid -> ArgumentOutOfRangeException

Please check and correct your inputs based on the types exception thrown. I hope you can modify your code based on these information and make it work seamlessly.
Please get back if you need any more help with the issue.