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42 lines
1.4 KiB
42 lines
1.4 KiB
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.Runtime.CompilerServices;
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using System.Text;
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using System.Threading.Tasks;
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namespace MVVMDemo
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{
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public class BaseViewModel : INotifyPropertyChanged
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{
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public event PropertyChangedEventHandler? PropertyChanged;
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/// <summary>
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/// 更新方式，其实只要下面的就行，在这边封装一层，更方便
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="properValue"></param>
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/// <param name="newValue"></param>
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/// <param name="properName"></param>
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protected void UpdateProperty<T>(ref T properValue, T newValue, [CallerMemberName] string properName = "")
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{
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//对比新旧值，如果相等就不更新
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if (object.Equals(properValue, newValue))
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return;
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properValue = newValue;
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NotifyPropertyChanged(properName);
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}
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/// <summary>
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/// 最基础的方式
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/// </summary>
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/// <param name="propertyName"></param>
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//public void NotifyPropertyChanged([CallerMemberName] string propertyName = null)//参数加上此标记就可以不用传递参数了
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public void NotifyPropertyChanged(string propertyName)
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{
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
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}
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}
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}
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