c# generate barcode from string Lesson 2: Exposing .NET Components to COM in Visual C#.NET

Generating QR in Visual C#.NET Lesson 2: Exposing .NET Components to COM

Lesson 2: Exposing .NET Components to COM
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After the project is built, the necessary type library information will be created by Visual Studio 2005, which will also register each of the objects as COM objects for you. The following listing is an example of code you might use in your project to create a .NET component that can be used by COM.
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' VB Public Class ComVisiblePerson Private _firstName As String Private _lastName As String Public Property FirstName() As String Get Return Me._firstName End Get Set(ByVal value As String) Me._firstName = value End Set End Property Public Property LastName() As String Get Return Me._lastName End Get Set(ByVal value As String) Me._lastName = value End Set End Property End Class // C# using System;
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using System.Collections.Generic; using System.Text; namespace NetForComDemoCS { class ComVisiblePerson { private String firstName; private String lastName; public String FirstName { get { return firstName; } set { firstName = value; } } public String LastName { get { return lastName; } set { lastName = value; } } } }
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If you compile the application with the code just shown and there are no errors, the assembly will be visible to COM.
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The first thing you need to be aware of when considering visibility is whether you want everything to be visible or invisible (making everything invisible makes little sense) and the level of granularity of this visibility. To set COM Visibility to either On or Off by default, simply set the ComVisible Assembly attribute to true or false, respectively.
' VB <Assembly: ComVisible(False)> ' Visibility disabled by default // C# [assembly: ComVisible(false)]
Next, for each class and each member that you want to have visible or invisible, simply use the ComVisible attribute individually for each of them:
' VB Imports System.Runtime.CompilerServices Imports System.Runtime.InteropServices
Lesson 2: Exposing .NET Components to COM
<ComVisible(False)> _ Public Class ComVisiblePerson Private _firstName As String Private _lastName As String Private _salary As String <ComVisible(True)> _ Public Property FirstName() As String Get Return Me._firstName End Get Set(ByVal value As String) Me._firstName = value End Set End Property <ComVisible(True)> _ Public Property LastName() As String Get Return Me._lastName End Get Set(ByVal value As String) Me._lastName = value End Set End Property <ComVisible(False)> _ Public Property Salary() As Int32 Get Return Me._salary End Get Set(ByVal value As Int32) Me._salary = value End Set End Property End Class // C# using System.Runtime.CompilerServices; using System.Runtime.InteropServices; namespace NetForComDemoCS { [ComVisible(false)] class ComVisiblePerson { private String firstName; private String lastName; private Int32 salary; [ComVisible(true)] public String FirstName
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Interoperation
{ get { return firstName; } set { firstName = value; } } [ComVisible(true)] public String LastName { get { return lastName; } set { lastName = value; } } [ComVisible(false)] public Int32 Salary { get { return salary; } set{salary = value} } } }
Deploying COM-Enabled Assemblies
Although an assembly can be created visible to COM, the MSDN documentation provides the following guidelines to ensure that things work as planned:
All classes must use a default constructor with no parameters. Any type that is to be exposed must be public. Any member that is to be exposed must be public. Abstract classes will not be able to be consumed.
After these criteria are met, the assembly is essentially ready to be exported. There are two mechanisms for doing this. As with many other tasks, you can use either Visual Studio 2005 or a command-line utility (TlbExp.exe). First, you need to compile the type through Visual Studio s build mechanism or through the command-line compiler. Here is an example:
' VB vbc /t:library ComVisiblePerson.vb // C# csc /t:library ComVisiblePerson.cs
Next you need to use the Type Library Exporter Utility. This should be done from the Visual Studio 2005 command prompt:
tlbexp ComVisiblePerson.dll /out:ComVisiblePersonlib.tlb
Lesson 2: Exposing .NET Components to COM
Next you need to create a resource script (ComVisiblePerson.res) with the following Interface Definition Language (IDL) definition:
IDR_TYPELIB1 typelib "ComVisiblePersonlib.tlb"
Then you recompile the application with the new resource file added, as shown here:
' VB vbc /t:library ComVisiblePerson.vb /win32res:ComVisiblePerson.res // C# csc /t:library ComVisiblePerson.cs /win32res:ComVisiblePerson.res
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