how to include use in library protected class?

Question

I made a library(dll file) for the follow code, And I make a succesfully Library file for ClassLibrary1.dll under side was the code:

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Data;
 using System.Windows.Forms;



 namespace ClassLibrary1
 {
    class A
    {
         protected int s11;

         protected int Lock11;
         protected int Queue11;
         protected int Singal11;

         protected A(int s, int Lock, int Queue, int Singal)
        {
            s11 = s;

            Lock11 = Lock;
            Queue11 = Queue;
            Singal11 = Singal;


        }

        // The constructor obtains the state information.


        protected int StartClient()
        {
            int status;

            status = s11 + Queue11 + Lock11 + Singal11;
             MessageBox.Show("hello!"+ status.ToString());



            return status;


        }
        public int TCall()
        {
            int status;
            status = StartClient();
            return status;
        }

    }


    class B : A
    {

        public B(int s, int Lock, int Queue, int Singal) : base(s, Lock, 
                Queue, Singal)
        {
            int status;
            // Can access protected int but not private int!
            status = TCall();

        }


    }


}

And in my App form , I need to use the class B & TCall(), The question was that I could not use it, what should I do in the follow Form call:

     using System.Collections.Generic;
     using System.Data;
     using System.Drawing;
     using System.Text;
     using System.Windows.Forms;
     using ClassLibrary2;

     namespace MainForm
     {
        public partial class Form1 : Form
        {
            public Form1()
            {
                    InitializeComponent();
             }

            private void button1_Click(object sender, EventArgs e)
            {
                // how could I use class B in this area, since it was 
                 public in ClassLibrary2 ??
                         B cc = new B();    // likewise
            }
        }
     }

Please help me how to use the library call for proteced?

hi and welcome to SO, did your add a reference to you dll and add using classlibrary1? — Josh Adams, Jan 14 '19 at 00:48
yes , I did add a reference about ClassLibrary1 in my Form App! — Angela, Jan 14 '19 at 00:51

score 0 · Answer 1 · answered Jan 14 '19 at 01:15

0

You may want to understand default access modifier of C#. In this case, your classes in ClassLibrary1 are internal. If you want to use them in your winform project, make them public or use friend assembly

answered Jan 14 '19 at 01:15

Leisen Chang

826
1
6
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I don't want make my code public , I would rather make it a protected type class, And could any one give me the answer not only a link address. it didn't work. – Angela Jan 14 '19 at 01:35
Add `[assembly: InternalsVisibleTo("MainForm")]` somewhere in your ClassLibrary1 – Leisen Chang Jan 14 '19 at 01:46
If this didn't work, you may have to use reflection or something else – Leisen Chang Jan 14 '19 at 01:47

score 0 · Answer 2 · answered Jan 14 '19 at 02:12

yes I did it , I include this two command line in my library (DLL) file

 using System.Runtime.CompilerServices;

 [assembly: InternalsVisibleTo("MainForm")]

And in my Form App , as like the follow code:

 using ClassLibrary1;

 namespace MainForm
{ 
    public partial class Form1 : Form
    {
         public Form1()
        {
            InitializeComponent();
        }

    private void button1_Click(object sender, EventArgs e)
    {
        int s = 1;
        int a= 1;
        int b = 1;
        int c = 1;

        // how could I use class B in this area, since it was public in ClassLibrary2 ??
        B cc = new B(s, a, b, c);
    }
}

}

I want say that it's sunshine day! – Angela Jan 14 '19 at 02:15 — Angela, Jan 14 '19 at 02:15

Christian Findlay · Answer 3 · 2019-01-14T03:39:16.730

0

You can't use B from your form because B is not public. But, if you make it public, you can do this:

        private void button1_Click(object sender, EventArgs e)
        {
            var cc = new B(1,1,1,1);
        }

edited Jan 14 '19 at 03:39

answered Jan 14 '19 at 03:21

Christian Findlay

6,770
5
51
103

I say it is appreciated~ – Angela Jan 14 '19 at 03:36

how to include use in library protected class?

3 Answers3