C# 动态。字符串属性路径

Question

假设我有这些类(class):

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

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

有没有可能做这样的事情:

    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>?

Answer 1

您可以通过反射来做到这一点。

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；你必须决定你想怎么做。

用法:

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

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

你甚至可以把它变成一个扩展方法，这样你就可以说

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