c# - 观察继承类的 ReactiveObject.Changed 可能有效也可能无效

Question

我尝试创建一个继承自 ReactiveObject 的基类。 此类需要检查任何属性(包括进一步继承的属性)是否已更改。

我的主要问题是，我得不到任何可靠的测试结果! 提供的测试可能是绿色的。使用 VS Live Unit Testing 运行它，将其变为红色。将类从测试项目移到库中可能会也可能不会使该测试通过。

到目前为止，保持绿色的唯一方法是在继承的类中取消注释这一行。

//  Changed.Subscribe(Console.WriteLine);

   [TestClass]
   public class StateBaseTests
   {
      #region Tests

      [TestMethod]
      public void State_ChangesToChanged_PropertyChanged()
      {
         var _item = new MyTest();

         _item.Surname = "Testname";

         Assert.AreEqual(Statetype.Changed, _item.State);
      }

      #endregion

      #region SubClasses

      public enum Statetype
      {
         Added,
         Changed,
         Deleted,
         Detached,
         Unchanged
      }

      public abstract class StateBase : ReactiveObject
      {
         protected StateBase()
         {
            State = Statetype.Unchanged;

            Changed.Select(prop => prop.PropertyName)
                   .Subscribe(UpdateZustand);
         }

         protected void UpdateZustand(string propertyName)
         {
            if(State == Statetype.Unchanged)
               State = Statetype.Changed;
         }

         [Reactive]
         public Statetype State { get; set; }
      }

      private class MyTest : StateBase
      {
         public MyTest()
         {
            //  Changed.Subscribe(Console.WriteLine);
         }

         [Reactive]
         public string Name { get; set; }

         [Reactive]
         public string Surname { get; set; }
      }
   }

Answer 1

这是对您的样本的轻微改编。是使用 VS Mac Community & NUnit 实现的吗？每次在我的机器上测试都会变绿。如您所见，还打印了属性名称。在我的控制台上它输出:

State
Surname

代码如下:

using System;
using System.Reactive.Linq;
using NUnit.Framework;
using ReactiveUI;
using ReactiveUI.Fody.Helpers;

namespace Testy {
    [TestFixture]
    public class Test {
        [Test]
        public void State_ChangesToChanged_PropertyChanged() {
            var _item = new MyTest();
            _item.Surname = "Testname";
            Assert.AreEqual(Statetype.Changed, _item.State);
        }
    }

    public enum Statetype {
        Added,
        Changed,
        Deleted,
        Detached,
        Unchanged
    }

    public abstract class StateBase : ReactiveObject {
        protected StateBase() {
            State = Statetype.Unchanged;

            Changed
                .Select(prop => prop.PropertyName)
                .Subscribe(
                    name => {
                        UpdateZustand(name);
                        Console.WriteLine(name);
                    });
        }

        protected void UpdateZustand(string propertyName) {
            if (State == Statetype.Unchanged)
                State = Statetype.Changed;
        }

        [Reactive]
        public Statetype State { get; set; }
    }

    public class MyTest : StateBase {
        [Reactive]
        public string Name { get; set; }

        [Reactive]
        public string Surname { get; set; }
    }
}

不确定这是否有帮助，但尝试一下很有趣 :)。

PS:这些是使用过的包版本:

• ReactiveUI(.Fody) 10.5.1
• Nunit 3.12.0
• NUnit3TestAdapter 3.15.1