LIOT/Framework/Senparc.Weixin/Entities/BindableBase.cs

#region Apache License Version 2.0
/*----------------------------------------------------------------

Copyright 2019 Jeffrey Su & Suzhou Senparc Network Technology Co.,Ltd.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the
License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
either express or implied. See the License for the specific language governing permissions
and limitations under the License.

Detail: https://github.com/JeffreySu/WeiXinMPSDK/blob/master/license.md

----------------------------------------------------------------*/
#endregion Apache License Version 2.0

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using Senparc.Weixin.Annotations;

namespace Senparc.Weixin.Entities
{
    /// <summary>
    /// 用于实现INotifyPropertyChanged
    /// </summary>
    [Serializable]
    public abstract class BindableBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        [NotifyPropertyChangedInvocator]
#if NET35 || NET40
        protected virtual void OnPropertyChanged(string propertyName)
#else
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
#endif
        {
            var eventHandler = this.PropertyChanged;
            if (eventHandler != null)
            {
                eventHandler(this, new PropertyChangedEventArgs(propertyName));
            }

            //PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));//需要VS2015+或新编译器支持
        }

        /// <summary>
        /// 设置属性
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="storage"></param>
        /// <param name="value"></param>
        /// <param name="propertyName"></param>
        /// <returns></returns>
        /// #if NET35 || NET40
#if NET35 || NET40
        protected bool SetProperty<T>(ref T storage, T value, String propertyName)
#else
        protected bool SetProperty<T>(ref T storage, T value, [CallerMemberName] String propertyName = null)
#endif

        {
            if (object.Equals(storage, value)) return false;

            storage = value;
            this.OnPropertyChanged(propertyName);
            return true;
        }
    }
}