添加项目文件。

TestAddinPlugin/TestAddin/Commands.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<KeyinTree xmlns="http://www.bentley.com/schemas/1.0/MicroStation/AddIn/KeyinTree.xsd">
+	<RootKeyinTable ID="root">
+		<Keyword SubtableRef="subKeyin" CommandWord="TestPlugin">
+			<Options Required="false"/>
+		</Keyword>
+	</RootKeyinTable>
+
+	<SubKeyinTables>
+		<KeyinTable ID="subKeyin">
+			<Keyword CommandWord="element" />
+			<Keyword CommandWord="addin" />		
+		</KeyinTable>
+	</SubKeyinTables>
+
+	<KeyinHandlers>
+		<KeyinHandler Keyin="TestPlugin element" Function="TestAddinPlugin.TestAddin.PluginKeyinFuncs.TestElement" />
+		<KeyinHandler Keyin="TestPlugin addin" Function="TestAddinPlugin.TestAddin.PluginKeyinFuncs.TestAddin" />		
+	</KeyinHandlers>
+</KeyinTree>

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;
+        }
+    }
+}

TestAddinPlugin/TestAddin/PluginKeyinFuncs.cs

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+using MSAddinTest.MSTestInterface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace TestAddinPlugin.TestAddin
+{
+    internal class PluginKeyinFuncs
+    {
+        [MSTest("element",Description ="这是keyin别名")]
+        public static void TestElement(string unparsed)
+        {
+           MessageBox.Show("我是 keyin,我被调用了");
+        }
+
+        public static void TestAddin(string unparsed)
+        {
+            MessageBox.Show("我是纯 keyin,且我没有被 MSTest 标记,我被调用了");
+        }
+    }
+}