如何获得Generic Property的名称?

Question

是否可以利用 nameof 获得generic property的名称? 如果不能是否有其它方法可以获得? 详见下面的测试对比代码.

    ////////////// generic  /////////////////////////////////

    [Fact]
    public void GetPropertyName_FromGeneric()
    {
        // un-compilable

        // Console.WriteLine(nameof(Foo<T>.Value));
        // Console.WriteLine(nameof(Foo<>.Value));
    }

    private class Foo<T>
    {
        public T? Value { get; set; }
    }

    ////////////// no-generic  /////////////////////////////////

    [Fact]
    public void GetPropertyName_FromNonGeneric()
    {
        Console.WriteLine(nameof(Bar.Value));
    }

    private class Bar
    {
        public int Value { get; set; }
    }

可以看到,对于generic类Foo, 我还没有找到可用的 nameof 方法来获得属性"Value"的名称. 请帮忙指出可用的方法,谢谢!

Answer 1

            Foo<int> foo = new Foo<int>();
            string name= nameof(foo.Value);
            Console.WriteLine(name);

Answer 2

How about using reflection?

    class Program  
    {  
        static void Main(string[] args)  
        {  
            Type type = typeof(MyClass<>);  
              
            PropertyInfo[] propertyInfos = type.GetProperties(BindingFlags.Public | BindingFlags.Instance);  
              
            var propertiesNames = propertyInfos.Select(prop => prop.Name);  
  
            foreach (var item in propertiesNames)  
            {  
                Console.WriteLine(item);  
            }  
            Console.ReadLine();  
        }  
    }  
    class MyClass<T>  
    {  
        public T Value { get; set; }  
    }  

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Answer 3

How about a Generic method. Reflection is required to find the property names at runtime.

public static void WritePropertyNameAndValues<T>(T obj)
{
    foreach (var prop in obj.GetType().GetProperties())
    {
        Console.WriteLine("{0} = {1}", prop.Name, prop.GetValue(obj, null));
    }
}

Answer 4

There really is not cool way.

using System.Diagnostics;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace BaseCoreUnitTestProject
{
    [TestClass]
    public partial class MainTest 
    {
        [TestMethod]
        public void TestMethod1()
        {
            Debug.WriteLine($"{nameof(Foo<object>.Value)}");

            var foo = new Foo<int> {Value = 99};
            foo.Ask();

            var foo1 = new Foo<object> {Value = true};
            foo1.Ask();
        }
    }
    class Foo<T>
    {
        public T? Value { get; set; }

        public void Ask()
        {
            Debug.WriteLine($"From Ask: {nameof(Value)}");
        }
    }
}