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