从名称中获取对象

Question

I have an object:

MyObject obj = new MyObject();
obj.X = "Hello";
obj.Y = "World";

Someone passes me a string:

string myString = "obj.X";

I want to get the value referenced to myString, like this:

var result = <Some Magic Expression>(myString); // "Hello"    

Is it possible through reflection?

Answer 1

You can't exactly replicate this behaviour, because names of local variables aren't saved in the method's metadata. However, if you keep a dictionary of objects, you can address the object by its key:

public static object GetProperty(IDictionary<string, object> dict, string path)
{
    string[] split = path.Split('.');
    object obj = dict[split[0]];
    var type = obj.GetType();
    return type.InvokeMember(split[1], BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetField | BindingFlags.GetProperty, null, obj, null);
}

var dict = new Dictionary<string, object>();
var cl = new MyClass();
dict["obj"] = cl;
cl.X = "1";
cl.Y = "2";
Console.WriteLine(GetProperty(dict, "obj.X"));
Console.WriteLine(GetProperty(dict, "obj.Y"));

This can handle accessing fields and properties in the format "name.property". Doesn't work for dynamic objects.