try to use python.net as the bridge.

WinAlfred/App.config

@@ -17,4 +17,4 @@
       <appender-ref ref="LogFileAppender"/>
     </root>
   </log4net>
-<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>
+<startup><supportedRuntime version="v2.0.50727"/></startup></configuration>

WinAlfred/MainWindow.xaml.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reflection;
 using System.Threading;
 using System.Windows;
 using System.Windows.Controls;
@@ -9,12 +10,14 @@ using System.Windows.Input;
 using System.Windows.Media.Animation;
 using System.Windows.Shapes;
 using Microsoft.Win32;
+using Python.Runtime;
 using WinAlfred.Commands;
 using WinAlfred.Helper;
 using WinAlfred.Plugin;
 using WinAlfred.PluginLoader;
 using KeyEventArgs = System.Windows.Input.KeyEventArgs;
 using MessageBox = System.Windows.MessageBox;
+using Python;
 using Timer = System.Threading.Timer;
 
 namespace WinAlfred
@@ -37,6 +40,12 @@ namespace WinAlfred
             resultCtrl.resultItemChangedEvent += resultCtrl_resultItemChangedEvent;
             ThreadPool.SetMaxThreads(30, 10);
             InitProgressbarAnimation();
+            Closed += MainWindow_Closed;
+        }
+
+        void MainWindow_Closed(object sender, EventArgs e)
+        {
+            PythonEngine.Shutdown();
         }
 
         private void InitProgressbarAnimation()
@@ -180,6 +189,8 @@ namespace WinAlfred
             //MessageBox.Show(engine.Evaluate("5 * 10 + 2").ToString());
         }
 
+     
+
         private void TbQuery_OnPreviewKeyDown(object sender, KeyEventArgs e)
         {
             switch (e.Key)

WinAlfred/PluginLoader/Plugins.cs

@@ -19,16 +19,17 @@ namespace WinAlfred.PluginLoader
             foreach (IPlugin plugin in plugins.Select(pluginPair => pluginPair.Plugin))
             {
                 IPlugin plugin1 = plugin;
-                //ThreadPool.QueueUserWorkItem(o =>);
-
-                plugin1.Init(new PluginInitContext()
+                ThreadPool.QueueUserWorkItem(o =>
                 {
-                    Plugins = plugins,
-                    ChangeQuery = s => window.ChangeQuery(s),
-                    CloseApp = window.CloseApp,
-                    HideApp = window.HideApp,
-                    ShowApp = window.ShowApp,
-                    ShowMsg = (title, subTitle, iconPath) => window.ShowMsg(title, subTitle, iconPath)
+                    plugin1.Init(new PluginInitContext()
+                    {
+                        Plugins = plugins,
+                        ChangeQuery = s => window.ChangeQuery(s),
+                        CloseApp = window.CloseApp,
+                        HideApp = window.HideApp,
+                        ShowApp = window.ShowApp,
+                        ShowMsg = (title, subTitle, iconPath) => window.ShowMsg(title, subTitle, iconPath)
+                    });
                 });
             }
         }

WinAlfred/PluginLoader/PythonPluginLoader.cs

@@ -1,12 +1,20 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
+using Python.Runtime;
 using WinAlfred.Plugin;
 
 namespace WinAlfred.PluginLoader
 {
     public class PythonPluginLoader : BasePluginLoader
     {
+
+        static PythonPluginLoader()
+        {
+            PythonEngine.Initialize();
+            PythonEngine.BeginAllowThreads();
+        }
+
         public override List<PluginPair> LoadPlugin()
         {
             List<PluginPair> plugins = new List<PluginPair>();

WinAlfred/PluginLoader/PythonPluginWrapper.cs

@@ -1,7 +1,9 @@
 using System;
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
+using System.Windows.Documents;
 using Newtonsoft.Json;
+using Python.Runtime;
 using WinAlfred.Plugin;
 
 namespace WinAlfred.PluginLoader
@@ -10,11 +12,6 @@ namespace WinAlfred.PluginLoader
     {
         private PluginMetadata metadata;
 
-        [DllImport("PyWinAlfred.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
-        private extern static IntPtr ExecPython(string directory, string file, string method, string para);
-        [DllImport("PyWinAlfred.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
-        private extern static void InitPythonEnv();
-
         public PythonPluginWrapper(PluginMetadata metadata)
         {
             this.metadata = metadata;
@@ -24,16 +21,12 @@ namespace WinAlfred.PluginLoader
         {
             try
             {
-                string s = Marshal.PtrToStringAnsi(ExecPython(metadata.PluginDirecotry, metadata.ExecuteFileName.Replace(".py", ""), "query", query.RawQuery));
+                string s = InvokeFunc(metadata.PluginDirecotry, metadata.ExecuteFileName.Replace(".py", ""),"query",query.RawQuery);
                 if (string.IsNullOrEmpty(s))
                 {
                     return new List<Result>();
                 }
 
-                if (s.StartsWith("PYTHONERROR"))
-                {
-                    throw new ArgumentException(s);
-                }
                 List<PythonResult> o = JsonConvert.DeserializeObject<List<PythonResult>>(s);
                 List<Result> r = new List<Result>();
                 foreach (PythonResult pythonResult in o)
@@ -41,7 +34,7 @@ namespace WinAlfred.PluginLoader
                     PythonResult ps = pythonResult;
                     if (!string.IsNullOrEmpty(ps.ActionName))
                     {
-                        ps.Action = () => ExecPython(metadata.PluginDirecotry, metadata.ExecuteFileName.Replace(".py", ""), ps.ActionName, ps.ActionPara);
+                        ps.Action = () => InvokeFunc(metadata.PluginDirecotry, metadata.ExecuteFileName.Replace(".py", ""), ps.ActionName, ps.ActionPara);
                     }
                     r.Add(ps);
                 }
@@ -55,9 +48,27 @@ namespace WinAlfred.PluginLoader
 
         }
 
+        private string InvokeFunc(string path, string moduleName,string func, string para)
+        {
+            IntPtr gs = PythonEngine.AcquireLock();
+
+            IntPtr pyStrPtr = Runtime.PyString_FromString(path);
+            IntPtr SysDotPath = Runtime.PySys_GetObject("path");
+            Runtime.PyList_Append(SysDotPath, pyStrPtr);
+
+            PyObject module = PythonEngine.ImportModule(moduleName);
+            module = PythonEngine.ReloadModule(module);
+            PyObject res = module.InvokeMethod(func, new PyString(para));
+            string json = Runtime.GetManagedString(res.Handle);
+
+            PythonEngine.ReleaseLock(gs);
+
+            return json;
+        }
+
         public void Init(PluginInitContext context)
         {
-            InitPythonEnv();
+           
         }
     }
 }

WinAlfred/WinAlfred.csproj

@@ -9,7 +9,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>WinAlfred</RootNamespace>
     <AssemblyName>WinAlfred</AssemblyName>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <WarningLevel>4</WarningLevel>
@@ -26,6 +26,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <AllowUnsafeBlocks>false</AllowUnsafeBlocks>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>
@@ -167,6 +168,10 @@
     <AppDesigner Include="Properties\" />
   </ItemGroup>
   <ItemGroup>
+    <ProjectReference Include="..\Pythonnet.Runtime\Python.Runtime.csproj">
+      <Project>{097b4ac0-74e9-4c58-bcf8-c69746ec8271}</Project>
+      <Name>Python.Runtime</Name>
+    </ProjectReference>
     <ProjectReference Include="..\WinAlfred.Plugin.System\WinAlfred.Plugin.System.csproj">
       <Project>{69ce0206-cb41-453d-88af-df86092ef9b8}</Project>
       <Name>WinAlfred.Plugin.System</Name>

WinAlfred/packages.config

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="log4net" version="2.0.3" targetFramework="net35" requireReinstallation="True" />
-  <package id="Newtonsoft.Json" version="5.0.8" targetFramework="net35" requireReinstallation="True" />
+  <package id="log4net" version="2.0.3" targetFramework="net35" />
+  <package id="Newtonsoft.Json" version="5.0.8" targetFramework="net35" />
 </packages>