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A C# alternative for the Visual Basic GetObject function

, 7 Dec 2006
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Make the BindToMoniker method work like the Visual Basic GetObject function.

Introduction

We needed to use an alternative to the Visual Basic GetObject function in C#. Marshal.BindToMoniker would do. But we can not, as in Visual Basic, directly reference the object returned and its methods or properties. We use the obj.GetType().InvokeMember method for this purpose. In this example, we will set the IIS Virtual Directory Basic Authentication using the IIsWebService COM interface.

  1. File -> New -> New Project

    Create a new CSGetObject Visual C# Windows application.

  2. From the main menu, click View -> Tool box.

  3. Drag a Button into the form.

  4. Double click the Button1.

  5. Replace the button1_Click method with the following code:

private void button1_Click(object sender, System.EventArgs e)
{
  try 
  {
  Object obj = Marshal.BindToMoniker("IIS://LocalHost/W3svc/1/Root");

  // Read Property
  bool v = (bool) obj.GetType().InvokeMember("AuthBasic", 
     BindingFlags.DeclaredOnly | 
     BindingFlags.Public | BindingFlags.NonPublic | 
     BindingFlags.Instance | 
     BindingFlags.GetProperty, null, obj, null);
  MessageBox.Show(v.ToString ());

  // Set Property
  // Params: Property or Method, BindingFlags, Binder,
  // Object, array of values or method params
  obj.GetType().InvokeMember("AuthBasic", 
     BindingFlags.DeclaredOnly | 
     BindingFlags.Public | BindingFlags.NonPublic | 
     BindingFlags.Instance | BindingFlags.SetProperty, 
     null, obj, new Object[] {!v});

  // Invoke Method
  obj.GetType().InvokeMember("SetInfo", 
     BindingFlags.DeclaredOnly | 
     BindingFlags.Public | BindingFlags.NonPublic | 
     BindingFlags.Instance | BindingFlags.InvokeMethod, 
     null, obj, null);
  }
  catch (Exception er)
  {
  MessageBox.Show(er.Message, "Error!!");
  }
} 

Add:

using System.Runtime.InteropServices;
using System.Reflection;

to the imports. Build the solution (F7), and run the application (F5).

Points of Interest

That's it!

History

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License

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About the Author

rmortega77
Software Developer CIMEX S.A.
Cuba Cuba
Rodolfo Ortega is a Cuban Computer Scientist. He works as IT Auditor for the CIMEX S.A. subsidiary in Holguin, Cuba. He lives and works in Holguin, in the eastern part of the island of Cuba.

You can contact him at rodolfom[]cimex.com.cu for any personal message: Ideas on new articles, bibliography about new APIs, questions, are wellcome.

Submit questions related with current article to the article forum.

Comments and Discussions

 
GeneralThank you!!! PinmemberJamie Nordmeyer14-Jan-09 12:31 

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