Post 中的 C# Odata WebApi 元素列表

C# Odata WebApi List of Elements in Post

我真的需要一些帮助。

我正在编写一个小型 WebApi 程序。

在进行单元测试时,我注意到我无法将元素列表发送到我的 post 方法。

先看看我的单元测试:

 [TestMethod]
    public async Task PostWithExpandoObjectSerilasationToDataType()
    {
        //Define an imaginary Car Object
        List<dynamic> listExpando = new List<dynamic>();

        dynamic obj1 = new ExpandoObject();
        obj1.Attribute = "PS";
        obj1.DataType = "Integer";
        obj1.EntityId = "3";
        obj1.DefaultValue = "";

        dynamic obj2 = new ExpandoObject();
        obj2.Attribute = "Color";
        obj2.DataType = "Text Only";
        obj2.EntityId = "3";
        obj2.DefaultValue = "";

        dynamic obj3 = new ExpandoObject();
        obj3.Attribute = "Km";
        obj3.DataType = "Number";
        obj3.EntityId = "3";
        obj3.DefaultValue = "1.3";

        listExpando.Add(obj1);
        listExpando.Add(obj2);
        listExpando.Add(obj3);

        JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
        javaScriptSerializer.RegisterConverters(new JavaScriptConverter[] { new ExpandoJsonconverter() });

        string jsonOfTest = javaScriptSerializer.Serialize(listExpando);

        // arrange
        UnityContainer container = UnityConfig.RegisterComponents();
        var start = new Startup(container);

        using (TestServer server = TestServer.Create(builder => start.Configuration(builder)))
        {
            using (var client = new HttpClient(server.Handler))
            {

                HttpContent content = new StringContent(jsonOfTest, Encoding.UTF8, "application/json");

                var request = new HttpRequestMessage
                {
                    RequestUri = new Uri("http://testserver/odata/Attributes"),
                    Method = HttpMethod.Post,
                    Content = content
                };

                string jsonContent = content.ReadAsStringAsync().Result;
               request.Headers.Add("Prefer", "return=representation");

                // act
                HttpResponseMessage response = await client.SendAsync(request);
                Attributes result = response.Content.ReadAsAsync<Attributes>().Result;

                // assert
                Assert.IsNotNull(response);
                Assert.AreEqual(HttpStatusCode.Created, response.StatusCode);
                Assert.IsNotNull(result, "No result content found");
                Assert.IsNotNull(result.Attribute);
            }
        }
    }

接下来是我的Post方法:

 public IHttpActionResult Post([ModelBinder]IEnumerable<Attributes> att)
    {....}

说到Post方法 att 始终为 null

尝试使用 Rest 服务时,我收到此消息:

"message": "Collection(EAVService.Entities.Attributes) is not an entity type. Only entity types are supported."

用谷歌搜索并尝试了不同的方法,但我没有找到有效的解决方案

有谁能帮我解决我的问题吗? :)

最好的问候 安德烈

在OData中,POST通常用于add a single entity to a collection。因此,您的 Post 方法应具有以下签名:

public IHttpActionResult Post(Attributes att)

有关完整示例,请参阅 Create an OData v4 Endpoint Using ASP.NET Web API 2.2 中的 "Adding an Entity to the Entity Set"。

如果您需要在单个服务调用中创建多个 Attributes 实体,您有两种选择:

  • 在您的服务中实施 batch request 处理

  • 实施一个 OData action 接受 Attributes 实体的集合并将它们批量添加到适当的实体集