Ninject for winforms - how to apply ninject DI for MDI child

I am developing desktop base application using c# windows form. Recently I added NInject to my project, it is working good but when i call to child forms from MDI form it's asking constructor parameter of child form because i am using form constructor to pass interface parameter. i don't know how to resolve it.

please can any one help me to resolve it. this is my sample project

CompositionRoot

public class CompositionRoot
{
private static IKernel _ninjectKernel;
public static void Wire(INinjectModule module)
{
_ninjectKernel = new StandardKernel(module);
}
public static T Resolve()
{
return _ninjectKernel.Get();
}
}

ApplicationModule

public class ApplicationModule : NinjectModule
{
public override void Load()
{
Bind(typeof(IRepository<>)).To(typeof(GenericRepository<>));
Bind(typeof(ITest)).To(typeof(TestImpl));
}
}

Program

static class Program
{
[STAThread]
static void Main()
{
CompositionRoot.Wire(new ApplicationModule());
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
//Application.Run(new Form1());
Application.Run(CompositionRoot.Resolve());
}
}

MDI Form

public partial class Form1 : Form
{
private IRepository _processRepository;
public Form1(IRepository productionRepository, ITest test)
{
this._processRepository = productionRepository;
this._test = test;
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Form2 frm = new *Form2()*;
frm.Show();
}
}

Child form

public partial class Form2 : Form
{
private ITest _test;
public Form2(ITest test)
{
_test = test;
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
var a = _test.DisplayRow();
MessageBox.Show(a);
}
}

ITest

public interface ITest
{
string DisplayRow();
}

TestImpl

public class TestImpl : ITest
{
public string DisplayRow()
{
return "Test service";
}
}

GenericRepository

public class GenericRepository : IRepository
{
public override string ToString()
{
return "MyRepository with type : " + typeof(T).Name;
}
}

IRepository

public interface IRepository
{
}

public partial class Form2 : Form
{
private ITest _test;
public Form2(ITest test)
{
_test = test;
InitializeComponent();
}
// 01. CREATE AN INITIALIZER WITH OUT PARAM
public Form2()
{
InitializeComponent();
}
// 01.1 CREAT ACCESS TO INTERFACE
public ITest MyTestInerface { set => _test = value; }
private void button1_Click(object sender, EventArgs e)
{
var a = _test.DisplayRow();
MessageBox.Show(a);
}
}
public partial class Form1 : Form
{
private IRepository _processRepository;
public Form1(IRepository productionRepository, ITest test)
{
this._processRepository = productionRepository;
this._test = test;
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Form2 frm = new Form2(); // 02. INIT WITHOUT PARAM
// After opening the form you set the Interface
frm.MyTestInerface = _myInterfaceFromSomeWhere // 03. SET PARAM
frm.Show();
}
}
#jefferson2020

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Jefferson S. Motta6y ago
1. public partial class Form2 : Form
2. {
3. private ITest _test;
4. public Form2(ITest test)
5. {
6. _test = test;
7. InitializeComponent();
8. }
10. // 01. CREATE AN INITIALIZER WITH OUT PARAM
11. public Form2()
12. {
13. InitializeComponent();
14. }
16. // 01.1 CREAT ACCESS TO INTERFACE
17. public ITest MyTestInerface { set => _test = value; }
19. private void button1_Click(object sender, EventArgs e)
20. {
21. var a = _test.DisplayRow();
22. MessageBox.Show(a);
23. }
24. }
27. public partial class Form1 : Form
28. {
29. private IRepository _processRepository;
30. public Form1(IRepository productionRepository, ITest test)
31. {
32. this._processRepository = productionRepository;
33. this._test = test;
34. InitializeComponent();
35. }
36. private void button1_Click(object sender, EventArgs e)
37. {
38. Form2 frm = new Form2(); // 02. INIT WITHOUT PARAM
40. // After opening the form you set the Interface
41. frm.MyTestInerface = _myInterfaceFromSomeWhere // 03. SET PARAM
43. frm.Show();
44. }
45. }
48. #jefferson2020