添加项目文件。

TestAddinPlugin/TestAddin/PluginKeyinFuncs.cs

@@ -0,0 +1,24 @@
+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");
+        }
+    }
+}