BreezeSharp - 的executeQuery失败的NullReferenceExcept

我一直在与BreezeJS了一段时间，我曾与它篦经验。正如我开始开发在.NET移动应用程序，我决定给BreezeSharp一试。

我通过文件和待办事项样品去了，并成功创建项目在解释http://www.breezejs.com/breeze-sharp-documentation/get-your-feet-wet 。

我有矿上现有的网络API控制器（与BreezeJS的伟大工程）执行查询的一个问题。

下面是查询方法：

    private async Task<IEnumerable<PriceBook>> QueryPriceBooksFrom(EntityManager entityManager)
    {
        try
        {
            var query = new EntityQuery<PriceBook>().From("PriceBooks");
            var result = await entityManager.ExecuteQuery(query);
            return result;
        }
        catch (Exception e)
        {
            MessageBox.Show(e.GetType().Name + ": " + e.Message);
            return new PriceBook[0];
        }
    }

这里是从BeginInit在（）的代码：

        DataContext = this;
        Configuration.Instance.ProbeAssemblies(typeof(PriceBook).Assembly);

        var entityManager = new EntityManager("http://127.0.0.1:81/api/cache/");

        entityManager.MetadataStore.NamingConvention = new NamingConvention().WithClientServerNamespaceMapping("clientNamespace", "serverNamespace");

        entityManager.MetadataStore.AllowedMetadataMismatchTypes = MetadataMismatchType.AllAllowable;

        entityManager.MetadataStore.MetadataMismatch += (s, e) =>
        {
            // Log the mismatch
            var message = string.Format("{0} : Type = {1}, Property = {2}, Allow = {3}",
                                        e.MetadataMismatchType, e.StructuralTypeName, e.PropertyName, e.Allow);
            Console.WriteLine(message);

            // Disallow missing navigation properties on the TodoItem entity type
            if (e.MetadataMismatchType == MetadataMismatchType.MissingCLRNavigationProperty &&
                e.StructuralTypeName.StartsWith("PriceBook"))
            {
                e.Allow = false;
            }
        };

这里是控制器的方法：

    [HttpGet]
    public IQueryable<PriceBook> PriceBooks(ODataQueryOptions options)
    {
        return ...;
    }

我从BaseEntity继承客户价目表类有子集服务器价目表实体。

在控制器元数据的方法被击中，但我无法打PriceBooks方法。相反，我得到的NullReferenceException：未将对象引用设置到对象的实例。

我曾尝试没有ODataQueryOptions参数，并与EntityQuery的各种版本，但没有成功。

当我尝试调用entityManager.fetchMetadata（例外的情况不会发生），但获取价目表时元数据的方法被再次调用。

有没有人有想法可能是什么问题？

编辑：这是问题的堆栈跟踪：

 at Breeze.Sharp.CsdlMetadataProcessor.ParseCsdlDataProperty(StructuralType parentType, JObject csdlProperty, List`1 keyNamesOnServer) in c:\GitHub\breeze.sharp\Breeze.Sharp\CsdlMetadataProcessor.cs:line 136
   at Breeze.Sharp.CsdlMetadataProcessor.<>c__DisplayClass14.<ParseCsdlEntityType>b__10(JToken csdlDataProp) in c:\GitHub\breeze.sharp\Breeze.Sharp\CsdlMetadataProcessor.cs:line 109
   at Breeze.Sharp.Core.EnumerableFns.ForEach[T](IEnumerable`1 items, Action`1 action) in c:\GitHub\breeze.sharp\Breeze.Sharp\Core\EnumerableFns.cs:line 35
   at Breeze.Sharp.CsdlMetadataProcessor.ParseCsdlEntityType(JObject csdlEntityType) in c:\GitHub\breeze.sharp\Breeze.Sharp\CsdlMetadataProcessor.cs:line 108
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Breeze.Sharp.CsdlMetadataProcessor.ProcessMetadata(MetadataStore metadataStore, String jsonMetadata) in c:\GitHub\breeze.sharp\Breeze.Sharp\CsdlMetadataProcessor.cs:line 33
   at Breeze.Sharp.MetadataStore.<FetchMetadata>d__a.MoveNext() in c:\GitHub\breeze.sharp\Breeze.Sharp\MetadataStore.cs:line 166
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Breeze.Sharp.EntityManager.<FetchMetadata>d__3.MoveNext() in c:\GitHub\breeze.sharp\Breeze.Sharp\EntityManager.cs:line 198
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Breeze.Sharp.EntityManager.<ExecuteQuery>d__b.MoveNext() in c:\GitHub\breeze.sharp\Breeze.Sharp\EntityManager.cs:line 230
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Breeze.Sharp.EntityManager.<ExecuteQuery>d__6`1.MoveNext() in c:\GitHub\breeze.sharp\Breeze.Sharp\EntityManager.cs:line 208
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at StanleySteemer.Nimbus.Mobile.MainWindow.<QueryPriceBooksFrom>d__9.MoveNext() in c:\Projects\SSI\Nimbus\source\StanleySteemer.Nimbus.Mobile\MainWindow.xaml.cs:line 109

解决方案 ：我想通了，问题是用枚举属性。我已经要求对我的客户省去服务器枚举属性：