C＃动态。字符串属性路径 [英] C# dynamic. String property path

问题描述

假设我有这些课程：

internal class A
{
    public B Field { get; set; }
}

internal class B
{
    public int SubField { get; set; }
}

是否可以这样做：

    var a = new A();
    a.Field = new B();
    a.Field.SubField = 10;

    dynamic d = a;
    var path = "Field.SubField";

    var i = d.path; // How to look for field <Field.SubField> instead of field <path>?

推荐答案

你可以用反思来做到这一点。

You can do this with reflection.

static object ReflectOnPath(object o, string path) {
    object value = o;
    string[] pathComponents = path.Split('.');
    foreach (var component in pathComponents) {
        value = value.GetType().GetProperty(component).GetValue(value, null);
    }
    return value;
}

上面绝对没有错误检查;你必须决定如何做到这一点。

There is absolutely no error checking in the above; you'll have to decide how you want to do that.

用法：

var a = new A();
a.Field = new B();
a.Field.SubField = 10;

string path = "Field.SubField";
Console.WriteLine(ReflectOnPath(a, path));

您甚至可以使用这种扩展方法，以便您可以说

You could even make this an extension method so that you can say

Console.WriteLine(a.ReflectOnPath("Field.SubField"));

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