C#开发COM组件(本地)

本篇文章介绍了如何用C#写一个简单的COM组件(Dll)。

1、新建一个C# Class Library项目“CSCOMTest”

2、项目中,新增一个接口文件IJustATestCOM.cs,Guid要自己生成

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;

namespace CSCOMTest
{
    [ComVisible(true)]
    [InterfaceType(ComInterfaceType.InterfaceIsDual)]
    [Guid("A5377871-3334-4679-A3CD-84312B1DCD3E")]
    public interface IJustATestCOM
    {
        int Add(int a, int b);
        String SayHiTo(String someOne);
    }
}

3、项目中,新增一个类文件JustATestCOM.cs,Guid要自己生成

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;

namespace CSCOMTest
{
    [ComVisible(true)]
    [Guid("A6E4F456-32C1-4C8E-9171-D616B5DA1E20")]
    [ProgId("CSCOMTest.JustATestCOM")]
    public class JustATestCOM : IJustATestCOM
    {
        public int Add(int a, int b)
        {
            return a + b;
        }

        public String SayHiTo(String someOne)
        {
            return "Hi " + someOne + "!";
        }
    }
}

4、项目属性->Application->Assembly Infomation->Make Assembly COM-Visible->打勾

5、项目属性->Signing->Sign the assembly->打勾
项目属性->Signing->Choose a strong name key file->New

6、编译

7、注册

#这里一定要用正确版本的gacutil及RegAsm
C:\VBS\DNFW4\gacutil.exe /i CSCOMTest.dll
C:\VBS\DNFW4\RegAsm.exe CSCOMTest.dll

8、反注册

#这里一定要用正确版本的gacutil及RegAsm
C:\VBS\DNFW4\gacutil.exe /u CSCOMTest
C:\VBS\DNFW4\RegAsm.exe /u CSCOMTest.dll

9、调用测试

'发生错误时,继续运行
On Error Resume Next

'清除错误状态
Err.Clear

Set Obj=CreateObject("CSCOMTest.JustATestCOM")

'输出错误信息
If Err.Number <> 0 Then
    WScript.Echo "Error: " & Err.Number
    WScript.Echo "Error (Hex): " & Hex(Err.Number)
    WScript.Echo "Source: " &  Err.Source
    WScript.Echo "Description: " &  Err.Description
    'Err.Clear
    '退出程序
    WScript.Quit(Err.Number)
End If

'On Error Goto 0

WScript.Echo obj.Add(1,2)
WScript.Echo obj.SayHiTo("dcom")


set obj=Nothing

10、生成tlb文件

regasm CSCOMTest.dll /tlb:CSCOMTest.tlb

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