有没有办法在 C# 中存储指向属性的指针? [英] Is there a way to store a pointer to a property in C#?

问题描述

例如，如果我想做这样的事情:

For example, if I wanted to do something like this:

class Program
{
    static void Main(string[] args)
    {
        var dictionary = new Dictionary<string, Property<AddressInfo>>
        {
            { "f", (thing) => thing.Foo },
            { "o", (thing) => thing.Foo },
            { "o", (thing) => thing.Foo },
            { "b", (thing) => thing.Bar },
            { "a", (thing) => thing.Bar },
            { "r", (thing) => thing.Bar },
        };
    }
}

class Thing
{
    public string Foo { get; set; }
    public string Bar { get; set; }
}

否则我必须将 getter 和 setter 分别存储为 Func 和 Action.

Otherwise I have to store both the getter and the setter as a Func and an Action separately.

推荐答案

我没有找到任何本地方法来做到这一点，但您可以创建一个结构体来做到这一点.免责声明:我确实实施了它，因为这样做很有趣.我没有测试，所以只是提供一个想法，我怀疑它的效率.

I did not find any native way to do it but you can create a struct which would do it. Disclaimer: I did implement it because it was fun to do. I didn't test so it's just togive an idea and I doubt it's efficient.

public class PropertyHolder<T, Y>
{
    private static object[] emptyArray = new object[0];

    public PropertyHolder(Y instance, string propertyName)
    {
        var property = typeof(Y).GetProperty(propertyName);
        var setMethod = property.SetMethod;
        var getMethod = property.GetMethod;
        Set = (t) => setMethod.Invoke(instance, new object[]{t});
        Get = () => (T) getMethod.Invoke(instance, emptyArray);
    }

    public Action<T> Set { get; private set; }        
    public Func<T> Get { get; private set; }        
}

你可以这样使用:

public class Toto
{
    public int TheInt { get; set; }
}

var x = new Toto();
var propPointer = new PropertyHolder<int,Toto>(x, nameof(Toto.TheInt));

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