System.Runtime.Serialization.SerializationException：期望来自命名空间的元素

Question

由于某种原因，我觉得这个对 post 的调用没有正确设置，这意味着给我的消息是我认为 WCF 中的方法没有在 POST 中接收到 InventoryRequest 对象？

   var inventoryRequest = new InventoryRequest
    {
        memberID = "1",
        Inventories = _inventories.ToArray()
    };


    //Act
    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri("http://localhost/Inventory");
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        inventoryResponse = await client.PostAsJsonAsync("", inventoryRequest).Result.Content.ReadAsAsync<InventoryResponse>();
    }

我在我的 MSTest 中收到此错误：

    System.Runtime.Serialization.SerializationException: Error in line 1 position 70. Expecting element 'InventoryResponse' from namespace 'http://schemas.datacontract.org/2004/07/Responses'.. Encountered 'Element'  with name 

'Fault', namespace 'http://schemas.microsoft.com/ws/2005/05/envelope/none'. 
    at System.Runtime.Serialization.DataContractSerializer.InternalReadObject(XmlReaderDelegator xmlReader, Boolean verifyObjectName, DataContractResolver dataContractResolver)
   at System.Runtime.Serialization.XmlObjectSerializer.ReadObjectHandleExceptions(XmlReaderDelegator reader, Boolean verifyObjectName, DataContractResolver dataContractResolver)
   at System.Runtime.Serialization.DataContractSerializer.ReadObject(XmlReader reader)

还有一点很奇怪，它在谈论上面的 xml 阅读器。我将 json 指定为内容类型，为什么它试图用 xml 解析？

旁注：当我在 Fiddler 中尝试 POST 到相同的 uri 并在提琴手主体中指定 InventoryRequest 的 json 表示时，它工作正常......并返回 json

Answer 1

这样试试：

using (var client = new HttpClient())
{
    client.BaseAddress = new Uri("http://localhost/");
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

    inventoryResponse = await client.PostAsJsonAsync("Inventory", inventoryRequest).Result.Content.ReadAsAsync<InventoryResponse>();
}