Create an ActiveX using a Csharp Usercontrol


This article is about creating
ActiveX controls using a DotNet Usercontrol in Csharp. You can design
all ActiveX features like: properties, methods and events.





Environment:
 
Visual Studio(2005) Csharp




How to Do This


1. Create a Usercontrol using Visual Studio (C#):

2. Configure the project properties:

3. Modify the usercontrol interface:

Note:
Make sur you added the EVENTS class: 

 [ClassInterface(ClassInterfaceType.AutoDual),
ComSourceInterfaces(typeof(UserControlEvents))]


using System;
using

System.Collections.Generic;

using
System.ComponentModel;
using
System.Drawing;
using
System.Data;
using
System.Text;
using
System.Windows.Forms;
// Add references

using

System.Runtime.InteropServices;

using
System.Reflection;

using
Microsoft.Win32;


namespace
CsharpWindowsActiveX
{

           
[
ProgId(“CsharpWindowsActiveX.ActiveXUserControl”)]
           
[
ClassInterface(ClassInterfaceType.AutoDual),
ComSourceInterfaces(typeof(UserControlEvents))]

           

public
partial class
ActiveXUserControl : UserControl
           
{

                   

public
ActiveXUserControl()
                   
{
                        
InitializeComponent();
                   
}

                    
…..


 

4. Add the register/unregister section in the source code




// register
COM ActiveX object

[ComRegisterFunction()]
public static void RegisterClass(string key)
{
              
StringBuilder
skey = new StringBuilder(key);
             
skey.Replace(
@”HKEY_CLASSES_ROOT\”, “”);
             
RegistryKey regKey = Registry.ClassesRoot.OpenSubKey(skey.ToString(),
true);
             
RegistryKey ctrl = regKey.CreateSubKey(“Control”);
            
ctrl.Close();
             
RegistryKey inprocServer32 = regKey.OpenSubKey(“InprocServer32”, true);
             
inprocServer32.SetValue(
“CodeBase”,
Assembly.GetExecutingAssembly().CodeBase);
             
inprocServer32.Close();
             
regKey.Close();
}


[ComUnregisterFunction()]
public static void UnregisterClass(string key)
{
              
StringBuilder skey = new StringBuilder(key);
              
skey.Replace(
@”HKEY_CLASSES_ROOT\”, “”);
              
RegistryKey regKey = Registry.ClassesRoot.OpenSubKey(skey.ToString(),
true);
              
regKey.DeleteSubKey(
“Control”,
false);
              
RegistryKey inprocServer32 = regKey.OpenSubKey(“InprocServer32”, true);
              
regKey.DeleteSubKey(
“CodeBase”,
false);
              
regKey.Close();
}

 


 

5. Add an ActiveX property:




// ActiveX
properties (Get/Set)
//////////////////////////////////////////////////////////////////

private int ptextVal;
public int TextVal
{
      
get
       {
                 
ptextVal = (
int)(numericUpDown1.Value);
                 
return ptextVal;
        }
       
se
t
       {

           
ptextVal =

value;
               
numericUpDown1.Value = ptextVal;
        
}
}

 


 

 

6. Add an ActiveX method:




// ActiveX
methods/functions
//////////////////////////////////////////////////////////////////

public interface ICOMCallable



{
            

int GetTextBoxValue();
}

public int
GetTextBoxValue()
{
            
int i = (int)(numericUpDown1.Value);
            
MessageBox.Show(“ActiveX method: GetTextBoxValue “ + i.ToString());
            
return (i);
}

 


 

7. Add an ActiveX event:




// Eventhandler interface
//////////////////////////////////////////////////////////////////
 

public
delegate
void
ControlEventHandler(int NumVal);
[Guid(“0A415E38-372F-45fb-813B-D9558C787EA0”)]
[InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
 

public
interface
UserControlEvents
{
              
[DispId(0x60020001)]
              
void
OnButtonClick(int
NumVal);
}
 

public
event
ControlEventHandler
OnButtonClick;
 

private
void
buttonOK_Click(object
sender, EventArgs
e)
{

      
 int
NumVal;
       
if
(OnButtonClick != null)
        {
                
NumVal = (int)(numericUpDown1.Value);
                
OnButtonClick(NumVal);
        
}
}

 


 

 

8. Register the ActiveX on your PC:

Register the new ActiveX on your computer using the
command:  RegAsm.exe CsharpWindowsActiveX.dll

9. Test your ActiveX:

Use the TSTCon32.exe tool from Visul Studio to test the
ActiveX:

 


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