用户列表页面完成 订单列表页面开始 10%

AllBase/Model/MvvmBaseClasses/PropertyNotifyObject.cs

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+using NPOI.Util;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AllBase.Model.MvvmBaseClasses
+{
+    public class PropertyNotifyObject
+ : NotifyPropertyBase, IDisposable
+    {
+        public PropertyNotifyObject()
+        {
+        }
+
+        Dictionary<object, object> _ValueDictionary = new Dictionary<object, object>();
+
+        #region 根据属性名得到属性值
+        public T GetPropertyValue<T>(string propertyName)
+        {
+            if (string.IsNullOrEmpty(propertyName)) 
+                throw new ArgumentException("invalid property name: " + propertyName);
+            object _propertyValue;
+            if (!_ValueDictionary.TryGetValue(propertyName, out _propertyValue))
+            {
+                _propertyValue = default(T);
+                _ValueDictionary.Add(propertyName, _propertyValue);
+            }
+            return (T)_propertyValue;
+        }
+        #endregion
+
+        public void SetPropertyValue<T>(string propertyName, T value)
+        {
+            if (!_ValueDictionary.ContainsKey(propertyName) || _ValueDictionary[propertyName] != (object)value)
+            {
+                _ValueDictionary[propertyName] = value;
+                OnPropertyChanged(propertyName);
+            }
+        }
+
+        #region Dispose
+        public void Dispose()
+        {
+            DoDispose();
+        }
+        ~PropertyNotifyObject()
+        {
+            DoDispose();
+        }
+        void DoDispose()
+        {
+            if (_ValueDictionary != null)
+                _ValueDictionary.Clear();
+        }
+        #endregion
+    }
+
+    public static class PropertyNotifyObjectEx
+    {
+        public static U GetValue<T, U>(this T t, Expression<Func<T, U>> exp) where T : PropertyNotifyObject
+        {
+            string _pN = MyCommMetoh.GetPropertyName(exp);
+            return t.GetPropertyValue<U>(_pN);
+        }
+
+        public static void SetValue<T, U>(this T t, Expression<Func<T, U>> exp, U value) where T : PropertyNotifyObject
+        {
+            string _pN = MyCommMetoh.GetPropertyName(exp);
+            t.SetPropertyValue<U>(_pN, value);
+        }
+    }
+
+    public class NotifyPropertyBase : INotifyPropertyChanged
+    {
+        #region INotifyPropertyChanged
+        public void OnPropertyChanged(string propertyName)
+        {
+            if (PropertyChanged != null)
+            {
+                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
+            }
+        }
+        public event PropertyChangedEventHandler PropertyChanged;
+        #endregion
+    }
+
+    public static class NotifyPropertyBaseEx
+    {
+        public static void OnPropertyChanged<T,U>(this T npb, Expression<Func<T, U>> exp) where T : NotifyPropertyBase, new()
+        {
+            string _PropertyName = MyCommMetoh.GetPropertyName(exp);
+            npb.OnPropertyChanged(_PropertyName);
+        }
+    }
+
+    public class MyCommMetoh
+    {
+        //得到属性的名称
+        public static string GetPropertyName<T, U>(Expression<Func<T, U>> exp)
+        {
+            string _pName = "";
+            if (exp.Body is MemberExpression)
+            {
+                _pName = (exp.Body as MemberExpression).Member.Name;
+            }
+            else if (exp.Body is UnaryExpression)
+            {
+                _pName = ((exp.Body as UnaryExpression).Operand as MemberExpression).Member.Name;
+            }
+            return _pName;
+        }
+    }
+}