添加项目文件。

TestAddinPlugin/TestAddin/PluginAddin.cs

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+using Bentley.MstnPlatformNET;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using MSAddinTest.MSTestInterface;
+
+namespace TestAddinPlugin.TestAddin
+{
+    /// <summary>
+    /// 测试 addin 调试
+    /// 1. 继承抽象类 MSTest_Addin
+    /// 2. 在 Init 中获取传递的 addin 供当前库使用
+    /// </summary>
+    [AddIn(MdlTaskID = "TestAddinPlugin")]
+    internal class PluginAddin : MSTest_Addin
+    {
+        public static AddIn Instance { get; private set; }
+        public PluginAddin(IntPtr mdlDescriptor) : base(mdlDescriptor)
+        {
+
+        }
+
+        public override void Init(AddIn addin)
+        {
+            Instance = addin;
+            Run(new string[] { });
+        }
+
+        protected override int Run(string[] commandLine)
+        {
+            return 0;
+        }
+    }
+}