C# extract an embedded resource from assembly to a specific location in pc?

Question

How can I with button click export a file (file types: .jpg, .txt, .dll, ... etc) from my application resource code to a specific location on my computer (for example: C: \\ drive) I tried this code with button click: Main Code:

Stream stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("ApplicationName.Files.name.dll");
        FileStream fileStream = new FileStream("name.dll", FileMode.CreateNew);
        for (int i = 0; i < stream.Length; i++)
            fileStream.WriteByte((byte)stream.ReadByte());
        fileStream.Close();

But the application stoped and show me this error: Error Message:

System.NullReferenceException: 'Object reference not set to an instance of an object.'

stream was null.

More Informations:

1) I upload a .dll file to my resources.

2) I changed from this file Build Action to = "Embedded Resource".

I tried with Clint's help below. Images of my project now:

enter image description here

enter image description here

enter image description here

Answer 1

Scenario I (Your Scenario)

• You have a project that has an embedded resource like (images,txt,etc)
• You want to extract this file from your assembly and transfer it to another location

Scenario II

• You have Class Library project (dll) that has an embedded resource like (images,txt, etc)
• You load this dll in your main project and want to access the resources (image) in your dll

Usage

Important: Before using the Code

• packages.config is an EmbeddedResource ( Substitute it with the resource you are using )

• Namespace of my project is ConsoleApp ( Substitute it with your namespace )

---

Main

   static void Main(string[] args)
   {

        ResourceManager.GetResourceInfo("packages.config");
        if (ResourceManager.resourceExists == false)
            return;

        //Loads packages.config in Bin/Debug
           ResourceManager.LoadResource("packages.config");

    }

ResourceManager.cs

    class ResourceManager
    {
      public static bool resourceExists { get; set; } = false;
      private static Stream resourceStream { get; set; }
      public static void GetResourceInfo(string fileNameWithExtension)
      {

          //Substitut this with your Project Name
        //Class Library Name AssistantLib >  Resources > AssistantLib.dll 
        const string pathToResource = "ConsoleApp.Folder1.Folder2";
        //The Dll that you want to Load
        var assembly = Assembly.GetExecutingAssembly();
        //var names = assembly.GetManifestResourceNames();
        var stream = assembly.GetManifestResourceStream($"{pathToResource}.{fileNameWithExtension}");
        if (stream == null)
            return;

        resourceExists = true;

        resourceStream = stream;

       }

      public static void LoadResource(string newFileNameWithExtension)
      {
        if(File.Exists(newFileNameWithExtension))
        {
            Console.WriteLine("File already exists");
            return;
        }
        using (Stream s = File.Create(newFileNameWithExtension))
        {
            Console.WriteLine("Loading file");
            resourceStream.CopyTo(s);
        }
      }
    }

Output

Package.Config in output folder