添加项目文件。

GroupLine.App/ViewModel/MainViewModel.cs

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+using GalaSoft.MvvmLight;
+
+namespace GroupLine.App.ViewModel
+{
+    /// <summary>
+    /// This class contains properties that the main View can data bind to.
+    /// <para>
+    /// Use the <strong>mvvminpc</strong> snippet to add bindable properties to this ViewModel.
+    /// </para>
+    /// <para>
+    /// You can also use Blend to data bind with the tool's support.
+    /// </para>
+    /// <para>
+    /// See http://www.galasoft.ch/mvvm
+    /// </para>
+    /// </summary>
+    public class MainViewModel : ViewModelBase
+    {
+        /// <summary>
+        /// Initializes a new instance of the MainViewModel class.
+        /// </summary>
+        public MainViewModel()
+        {
+            ////if (IsInDesignMode)
+            ////{
+            ////    // Code runs in Blend --> create design time data.
+            ////}
+            ////else
+            ////{
+            ////    // Code runs "for real"
+            ////}
+        }
+    }
+}