c# - 具有Simple.OData.Client的DTO

Question

在我的服务器中，我有以下设置：

EntitySet<Contact>("Contacts");
EntityType<ContactDto>();

这是控制器动作：

[EnableQuery]
public ActionResult<IQueryable<ContactDto>> Get()
{
  return Ok(_DbContext.Contacts.Select(c => new ContactDto(c)));
}

[EnableQuery]
public async Task<ActionResult<Contact>> Get(int key)
{
  return await _DbContext.Contacts.FindAsync(key);
}

Contact和 ContactDto实现 IContact，除了它们彼此之间不知道。

当查询服务器（使用 Contacts路由）时，我得到了预期的结果，但是在客户端中，我试图这样做：

var settings = new ODataClientSettings(new Uri(
    $"https://localhost:{Constants.Port}/{Constants.Api}"));
var client = new ODataClient(settings);

var result = await client
    .For<Contact>()
    .FindEntriesAsync();

我有一个例外：


   Microsoft.OData.ODataException: 'The context URL 'https://localhost:54687/api/$metadata#Contacts/ODataDtoRepro.Models.ContactDto' is invalid


堆栈跟踪：

at Microsoft.OData.JsonLight.ODataJsonLightContextUriParser.ParseContextUriFragment(String fragment, Func`3 clientCustomTypeResolver, Boolean throwIfMetadataConflict, Boolean& isUndeclared)
   at Microsoft.OData.JsonLight.ODataJsonLightContextUriParser.ParseContextUri(ODataPayloadKind expectedPayloadKind, Func`3 clientCustomTypeResolver, Boolean throwIfMetadataConflict)
   at Microsoft.OData.JsonLight.ODataJsonLightContextUriParser.Parse(IEdmModel model, String contextUriFromPayload, ODataPayloadKind payloadKind, Func`3 clientCustomTypeResolver, Boolean needParseFragment, Boolean throwIfMetadataConflict)
   at Microsoft.OData.JsonLight.ODataJsonLightDeserializer.ReadPayloadStart(ODataPayloadKind payloadKind, PropertyAndAnnotationCollector propertyAndAnnotationCollector, Boolean isReadingNestedPayload, Boolean allowEmptyPayload)
   at Microsoft.OData.JsonLight.ODataJsonLightReader.ReadAtStartImplementation()
   at Microsoft.OData.ODataReaderCore.ReadImplementation()
   at Microsoft.OData.ODataReaderCore.ReadSynchronously()
   at Microsoft.OData.ODataReaderCore.InterceptException[T](Func`1 action)
   at Microsoft.OData.ODataReaderCore.Read()
   at Simple.OData.Client.V4.Adapter.ResponseReader.ReadResponse(ODataReader odataReader, IODataResponseMessageAsync responseMessage)
   at Simple.OData.Client.V4.Adapter.ResponseReader.<GetResponseAsync>d__3.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
   at Simple.OData.Client.ODataClient.<ExecuteRequestWithResultAsync>d__147`1.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
   at Simple.OData.Client.ODataClient.<FindAnnotatedEntriesAsync>d__88.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
   at Simple.OData.Client.ODataClient.<FindEntriesAsync>d__89.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
   at Simple.OData.Client.FluentClientBase`2.<FilterAndTypeColumnsAsync>d__91.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Client.Program.<Main>d__0.MoveNext() in D:\Users\Shimmy\Documents\Visual Studio 2019\Projects\ODataDtoRepro\Client\Program.cs:line 16

我在 GitHub上做了一个repro项目。

我创建了另一个 repro branch，尝试使用不同的方法，以便它使用在EDM模型中注册的共享基类，而不是接口。
尽管如此，Simple.OData.Client仍然无法解决它。
请同时检查我对 this问题的评论。

如何使DTO与OData一起使用？

更新资料

可能的解决方案：使用动作/功能。尝试进行过测试，但无法使其在客户端和服务器之间运行，请参阅 this答案以获取更多信息。

Answer 1

我认为问题在于两个对象之间没有关系。我删除了您的代码，并通过删除实体集使其正常工作

var edmModel = new ODataConventionModelBuilder();
edmModel.EntitySet<ContactDto>("Contacts");
routeBuilder.MapODataServiceRoute("API Route", Constants.Api, edmModel.GetEdmModel());

并通过ContactD来扩展Contact

public class ContactDto : Contact

由于联系人是联系人dto的子集，因此按预期返回且没有错误。让我知道是否要我将代码提交到您的github。