fixed #192

src/Shared/HandyControlDemo_Shared/Tools/Helper/ExternDllHelper.cs

@@ -1,12 +0,0 @@
-using System.Runtime.InteropServices;
-
-namespace HandyControlDemo.Tools
-{
-    internal class ExternDllHelper
-    {
-        private const string Winmm = "winmm.dll";
-
-        [DllImport(Winmm, EntryPoint = "mciSendString", CharSet = CharSet.Auto)]
-        public static extern int MciSendString(string lpstrCommand, string lpstrReturnString, int uReturnLength, int hwndCallback);
-    }
-}

src/Shared/HandyControlDemo_Shared/Tools/Helper/Win32Helper.cs

@@ -7,5 +7,8 @@ namespace HandyControlDemo.Tools
     {
         [DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
         public static extern bool SetForegroundWindow(IntPtr hWnd);
+
+        [DllImport("winmm.dll", EntryPoint = "mciSendString", CharSet = CharSet.Auto)]
+        public static extern int MciSendString(string lpstrCommand, string lpstrReturnString, int uReturnLength, int hwndCallback);
     }
 }