添加项目文件。

WPFMonitorRevitAPI-master/DoWork/ViewModelBase.cs

@@ -0,0 +1,28 @@
+namespace Utils.Basis
+{
+    using System.ComponentModel;
+
+    public abstract class ViewModelBase : INotifyPropertyChanged
+    {
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        protected bool Set<T>(ref T field, T newValue = default(T), [System.Runtime.CompilerServices.CallerMemberName] string propertyName = null)
+        {
+            if (System.Collections.Generic.EqualityComparer<T>.Default.Equals(field, newValue))
+            {
+                return false;
+            }
+
+            field = newValue;
+
+            OnPropertyChanged(propertyName);
+
+            return true;
+        }
+
+        public virtual void OnPropertyChanged([System.Runtime.CompilerServices.CallerMemberName] string propertyName = null)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}