45 lines
1.6 KiB
C#
45 lines
1.6 KiB
C#
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using GalaSoft.MvvmLight;
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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.Runtime.CompilerServices;
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using System.Text;
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using System.Threading.Tasks;
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namespace FujianEarthquake.Common
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{
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public class NotifyBase : ObservableObject, INotifyPropertyChanged
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{
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public event PropertyChangedEventHandler? PropertyChanged;
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//[CallerMemberName]string propName = "" 设置一个默认值 提高容错性
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public void DoNotify([CallerMemberName] string propName = "")
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{
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
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}
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/// <summary>
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/// Sets property if it does not equal existing value. Notifies listeners if change occurs.
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/// </summary>
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/// <typeparam name="T">Type of property.</typeparam>
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/// <param name="member">The property's backing field.</param>
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/// <param name="value">The new value.</param>
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/// <param name="propertyName">Name of the property used to notify listeners. This
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/// value is optional and can be provided automatically when invoked from compilers
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/// that support <see cref="CallerMemberNameAttribute"/>.</param>
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protected virtual bool SetProperty<T>(ref T member, T value, [CallerMemberName] string? propertyName = null)
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{
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if (EqualityComparer<T>.Default.Equals(member, value))
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{
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return false;
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}
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member = value;
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DoNotify(propertyName);
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return true;
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}
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}
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}
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