call a non extension method defined inside non static class from Main() c#

Question

I tried calling Extension method defined under static class from Main(), It worked. Now I want to use this in my application, to do so I need make the Extension method as a static method(Because I don' t have static classes defined in my application) and call It from Main().

Here what I' m trying:

public class Get 
{  
     public static void CopyTo(Stream input, Stream output) //Method
       {
       byte[] buffer = new byte[32768];  
       int read;
       while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
       {
       output.Write (buffer, 0, read);
       }
       }  
 public static void Main ()
    {
              ////I' m just mentioning a small part of my code
              ////Please ignore about the variables(url, baseURL,authenticatestr...) those are not declared here, they have been declared at some other part in the code
            /////Here in the main method I have a call to the above method

       HttpWebRequest request = (HttpWebRequest)WebRequest.Create (url);
       request = (HttpWebRequest)WebRequest.Create (baseURL + uri);
       request.Headers.Add ("Authn", authenticateStr);
       request.Accept = "";
       request.Method = "GET";
       webResponse = (HttpWebResponse)request.GetResponse();
       using (MemoryStream ms = new MemoryStream())
       using (FileStream outfile = new FileStream("1" , FileMode.Create)) {
           webResponse.GetResponseStream().CopyTo(ms);///Here I need to call my method                                                                      
           outfile.Write(ms.GetBuffer(), 0, (int)ms.Length);
                }

But this is still trying to call the .NetFramework CopyTo() method. How do I make a call to the defined method int the code? Please help me.

Thank you.

Answer 1

How do I make a call to the defined method int the code?

Just don't call it on a stream (which makes it look like an instance method). Call it as a normal static method, with two arguments corresponding to the two parameters:

CopyTo(webResponse.GetResponseStream(), ms);

Non-extension static methods can never be called on an instance. You can use just the simple name, or qualify it with the type name ( Get.CopyTo(...) ).

It's not clear why you want to use this at all if you're using .NET 4+ where CopyTo is supported though.

Answer 2

If I understood your question right, you wanted to create an extension method which copies a stream into another one. To define an extension method, use

public static class myExtensions
{
     public static void myCopyTo(this Stream input, Stream output)
     {
        // your code goes here
     }
}

Then you can call it the following way:

webResponse.GetResponseStream().myCopyTo(ms);

Notes:

• The class which contains the extension methods must be static and it must be a top-level class.
• The extension method must be static as well, it must contain the keyword this as 1st parameter. This parameter denotes the type of the class which you want to extend.
• I have renamed your method to avoid conflicts with the existing .NET framework's CopyTo method

I hope that helps. Please let me know if you need any additional hints.