c# - 动态对象 - 运行时报告字段不存在但可以在调试器中看到它？

Question

编辑:重新启动 visual studio 解决了这个问题，没有更改代码。

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我有一个使用动态类型和 expando 对象的 ConfigSection 处理程序。测试失败报告 'object' 不包含 'SportName' 的定义。我试图在控制台中复制，将 ConfigSection 处理程序排除在等式之外，但看起来等效代码工作正常。我很难过。

请参阅下面的测试、ConfigurationSectionHandler 和配置 xml

public class SportSection : IConfigurationSectionHandler
{
    public object Create(object parent, object configContext, XmlNode section)
    {
        var doc = XDocument.Parse(section.OuterXml);
        var root = (XElement)doc.FirstNode;

        try
        {
            var sportList = root.Element("sportList").Elements("sport").Select(ToSport);

            dynamic config = new ExpandoObject();
            config.SportList = sportList;

            return config;
        }
        catch (Exception ex)
        {
            throw new ConfigurationErrorsException("Invalid SportSection configuration", ex);
        }
    }

    private static dynamic ToSport(XElement sportElement)
    {
        try
        {
            var getAttrib = new Func<XElement, string, string>((x, atr) => x.Attribute(atr).Value);
            var getDictionary =
                new Func<IEnumerable<XElement>, IDictionary<string, string>>(elems => elems.ToDictionary(x => x.Attribute("name").Value, y => y.Attribute("value").Value));

            return new
            {
                SportName = sportElement.Attribute("name").Value,
                EventProperties = getDictionary(sportElement.Element("eventProperties").Elements("property")),
                CompetitionProperties = getDictionary(sportElement.Element("competitionProperties").Elements("property")),
                MappedMarkets = sportElement.Element("mapping").Elements("market").Select(x => new MappedMarket() { Type = getAttrib(x, "type"), MappedType = getAttrib(x, "mappedType") })
            };
        }
        catch (Exception ex)
        {

            throw ex;
        }

    }
}


[Test]
    public void GoodConfig()
    {
        var document = new XmlDocument();
        document.LoadXml(Resources.ValidSportSectionConfig);

        var config = new SportSection().Create(null, null, document) as dynamic;

        IEnumerable<dynamic> sportList = config.SportList;

        Assert.AreEqual(1, sportList.Count());
        //Microsoft.CSharp.RuntimeBinder.RuntimeBinderException : 'object' does not contain a definition for 'SportName'
        Assert.AreEqual("Baseball", sportList.Select(x => (string) x.SportName).First()); 

        var eventProperties = sportList.First(x => x.SportName == "Baseball").EventProperties as IDictionary<string, string>;

        Assert.AreEqual(2, eventProperties.Count);
        Assert.AreEqual("BSB", eventProperties["SportId"]);
        Assert.AreEqual("THA", eventProperties["CompetitorReferenceId"]);

        var compProps = sportList.First(x => x.SportName == "Baseball").CompetitionProperties as IDictionary<string, string>;
        Assert.AreEqual(2, compProps.Count);
        Assert.AreEqual("BSB", compProps["SportId"]);
        Assert.AreEqual("CUP", compProps["CompetitionOrgMethodId"]);

        var mappedMarkets = (sportList.First(x => x.SportName == "Baseball").MappedMarkets as IEnumerable<MappedMarket>).ToList();
        Assert.AreEqual(2, mappedMarkets.Count());
        Assert.AreEqual("match_winner" , mappedMarkets[0].Type);
        Assert.AreEqual("BSBAO", mappedMarkets[0].MappedType);
        Assert.AreEqual("handicap", mappedMarkets[0].Type);
        Assert.AreEqual("BSBAQ", mappedMarkets[0].MappedType);
    }

<sportSettings>
  <sportList>
    <sport name="Baseball">
    <eventProperties>
      <property name="SportId" value="BSB"></property>
      <property name="CompetitorReferenceId" value="THA"></property>
    </eventProperties>
    <competitionProperties>
      <property name="SportId" value="BSB" />
      <property name="CompetitionOrgMethodId" value="CUP" />
    </competitionProperties>
    <mapping>
      <market type="match_winner" mappedType="BSBAO" />
      <market type="handicap" mappedType="BSBAQ" />
    </mapping>
    </sport>
  </sportList>
</sportSettings>

更新 - 堆栈跟踪:

at CallSite.Target(Closure , CallSite , Object )
at System.Dynamic.UpdateDelegates.UpdateAndExecute1[T0,TRet](CallSite site, T0 arg0)
at SS.Integration.EVenue.WindowsService.UnitTests.Configuration.SportSectionTests.<GoodConfig>b__11(Object x) in C:\_Git\SS.Integration.EVenue\SS.Integration.EVenue.WindowsService.UnitTests\Configuration\SportSectionTests.cs:line 35

Answer 1

ToSport 返回匿名类型而不是 ExpandoObject。将匿名类型转换为动态类型时必须小心，因为这些类型具有 internal 的访问修饰符。因此，如果您跨越程序集边界，运行时将看不到任何可访问的属性。尝试:

 private static dynamic ToSport(XElement sportElement)
    {
        try
        {
            var getAttrib = new Func<XElement, string, string>((x, atr) => x.Attribute(atr).Value);
            var getDictionary =
                new Func<IEnumerable<XElement>, IDictionary<string, string>>(elems => elems.ToDictionary(x => x.Attribute("name").Value, y => y.Attribute("value").Value));


            dynamic n = new ExpandoObject();
            n.SportName = sportElement.Attribute("name").Value;
            n.EventProperties = getDictionary(sportElement.Element("eventProperties").Elements("property"));
            n.CompetitionProperties = getDictionary(sportElement.Element("competitionProperties").Elements("property"));
            n.MappedMarkets = sportElement.Element("mapping").Elements("market").Select(x => new MappedMarket() { Type = getAttrib(x, "type"), MappedType = getAttrib(x, "mappedType") });

            return n;
        }
        catch (Exception ex)
        {

            throw ex;
        }

    }