增加日志写入

ViewModel/AppData.cs

@@ -1,4 +1,5 @@
 using GeekDesk.Util;
+using Newtonsoft.Json;
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
@@ -84,6 +85,11 @@ namespace GeekDesk.ViewModel
             }
         }
 
+        public override String ToString()
+        {
+            return JsonConvert.SerializeObject(this);
+        }
+
         [field: NonSerializedAttribute()]
         public event PropertyChangedEventHandler PropertyChanged;
         private void OnPropertyChanged(string propertyName)