我正在编写一个处理INotifyPropertyChanged的库，主要思想是使用动态代理来通知更改。

回购在这里:CaulyKan/NoMorePropertyChanged

使用这个库，你可以写:

    public dynamic Test1Binding { get; set; }
    public TestDTO Test1
    {
        get { return (TestDTO)Test1Binding; }
        set { SetBinding(nameof(Test1Binding), value); }
    }

然后将所有绑定和修改转到Test1Binding，无论TestDTO有多复杂，它都会自动通知PropertyChange和CollectionChanged。

它还可以处理依赖关系。

    [DependsOn("Test1Binding.TestString")]
    public string Test2
    {
        get { return Test1Binding.TestString; }
    }

请给我一些建议。

我真的很喜欢Marc的解决方案，但我认为可以稍微改进一下，以避免使用“魔法字符串”(不支持重构)。与其将属性名作为字符串使用，不如将其创建为lambda表达式:

private string name;
public string Name
{
    get { return name; }
    set { SetField(ref name, value, () => Name); }
}

只需要在Marc的代码中添加以下方法，就可以了:

protected virtual void OnPropertyChanged<T>(Expression<Func<T>> selectorExpression)
{
    if (selectorExpression == null)
        throw new ArgumentNullException("selectorExpression");
    MemberExpression body = selectorExpression.Body as MemberExpression;
    if (body == null)
        throw new ArgumentException("The body must be a member expression");
    OnPropertyChanged(body.Member.Name);
}

protected bool SetField<T>(ref T field, T value, Expression<Func<T>> selectorExpression)
{
    if (EqualityComparer<T>.Default.Equals(field, value)) return false;
    field = value;
    OnPropertyChanged(selectorExpression);
    return true;
}

顺便说一句，这是受到这篇博客文章的启发。

使用这个

using System;
using System.ComponentModel;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.Remoting.Messaging;
using System.Runtime.Remoting.Proxies;


public static class ObservableFactory
{
    public static T Create<T>(T target)
    {
        if (!typeof(T).IsInterface)
            throw new ArgumentException("Target should be an interface", "target");

        var proxy = new Observable<T>(target);
        return (T)proxy.GetTransparentProxy();
    }
}

internal class Observable<T> : RealProxy, INotifyPropertyChanged, INotifyPropertyChanging
{
    private readonly T target;

    internal Observable(T target)
        : base(ImplementINotify(typeof(T)))
    {
        this.target = target;
    }

    public override IMessage Invoke(IMessage msg)
    {
        var methodCall = msg as IMethodCallMessage;

        if (methodCall != null)
        {
            return HandleMethodCall(methodCall);
        }

        return null;
    }

    public event PropertyChangingEventHandler PropertyChanging;
    public event PropertyChangedEventHandler PropertyChanged;



    IMessage HandleMethodCall(IMethodCallMessage methodCall)
    {
        var isPropertySetterCall = methodCall.MethodName.StartsWith("set_");
        var propertyName = isPropertySetterCall ? methodCall.MethodName.Substring(4) : null;

        if (isPropertySetterCall)
        {
            OnPropertyChanging(propertyName);
        }

        try
        {
            object methodCalltarget = target;

            if (methodCall.MethodName == "add_PropertyChanged" || methodCall.MethodName == "remove_PropertyChanged"||
                methodCall.MethodName == "add_PropertyChanging" || methodCall.MethodName == "remove_PropertyChanging")
            {
                methodCalltarget = this;
            }

            var result = methodCall.MethodBase.Invoke(methodCalltarget, methodCall.InArgs);

            if (isPropertySetterCall)
            {
                OnPropertyChanged(methodCall.MethodName.Substring(4));
            }

            return new ReturnMessage(result, null, 0, methodCall.LogicalCallContext, methodCall);
        }
        catch (TargetInvocationException invocationException)
        {
            var exception = invocationException.InnerException;
            return new ReturnMessage(exception, methodCall);
        }
    }

    protected virtual void OnPropertyChanged(string propertyName)
    {
        var handler = PropertyChanged;
        if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
    }

    protected virtual void OnPropertyChanging(string propertyName)
    {
        var handler = PropertyChanging;
        if (handler != null) handler(this, new PropertyChangingEventArgs(propertyName));
    }

    public static Type ImplementINotify(Type objectType)
    {
        var tempAssemblyName = new AssemblyName(Guid.NewGuid().ToString());

        var dynamicAssembly = AppDomain.CurrentDomain.DefineDynamicAssembly(
            tempAssemblyName, AssemblyBuilderAccess.RunAndCollect);

        var moduleBuilder = dynamicAssembly.DefineDynamicModule(
            tempAssemblyName.Name,
            tempAssemblyName + ".dll");

        var typeBuilder = moduleBuilder.DefineType(
            objectType.FullName, TypeAttributes.Public | TypeAttributes.Interface | TypeAttributes.Abstract);

        typeBuilder.AddInterfaceImplementation(objectType);
        typeBuilder.AddInterfaceImplementation(typeof(INotifyPropertyChanged));
        typeBuilder.AddInterfaceImplementation(typeof(INotifyPropertyChanging));
        var newType = typeBuilder.CreateType();
        return newType;
    }
}

}

在实现这些类型的属性时，你可能要考虑的其他事情是INotifyPropertyChang *ed *ing都使用事件参数类。

如果要设置大量的属性，那么事件参数类实例的数量可能非常大，您应该考虑缓存它们，因为它们是可能发生字符串爆炸的区域之一。

看一下这个实现，并解释为什么要考虑它。

Josh Smiths博客

反射:利用反射的思想:

class ViewModelBase : INotifyPropertyChanged {

    public event PropertyChangedEventHandler PropertyChanged;

    bool Notify<T>(MethodBase mb, ref T oldValue, T newValue) {

        // Get Name of Property
        string name = mb.Name.Substring(4);

        // Detect Change
        bool changed = EqualityComparer<T>.Default.Equals(oldValue, newValue);

        // Return if no change
        if (!changed) return false;

        // Update value
        oldValue = newValue;

        // Raise Event
        if (PropertyChanged != null) {
            PropertyChanged(this, new PropertyChangedEventArgs(name));
        }//if

        // Notify caller of change
        return true;

    }//method

    string name;

    public string Name {
        get { return name; }
        set {
            Notify(MethodInfo.GetCurrentMethod(), ref this.name, value);
        }
    }//method

}//class

我认为人们应该多关注一下表现;当有很多对象需要绑定时(想想有10,000多行的网格)，或者对象的值经常变化时(实时监控应用程序)，它确实会影响UI。

我把这里和其他地方找到的各种实现进行了比较;查看INotifyPropertyChanged实现的性能比较。

下面是测试结果