Odata控制器:如何在客户端将Odata响应转换为C#对象 [英] Odata Controller: How to convert Odata response to C# object at client

问题描述

我们收到了以下Odata响应:

We have got a Odata response as below:

"{\r\n  \"@odata.context\":\"http://localhost/ApplicationService/model/$metadata#Edm.String\",\"value\":\"{\\\"Messages\\\":[\\\"message 1\\\",\\\"message 2\\\",\\\"message 3\\\",\\\"message 4\\\"],\\\"IsValidEntity\\\":false}\"\r\n}"

现在说我们有一堂课:

    public class myValidationResult
    {
        public myValidationResult()
        {
            Messages = new List<string>();
        }
        public List<string> Messages { get; set; }
        public bool IsValidEntity { get; set; }
    }

该类在MyOdataController类中使用，如下所示:

This class used in MyOdataController class as below:

public class MyODataController : ODataController 
{
        [Authorize(Roles = "Admin")]
        public async Task<IHttpActionResult> Post(T entity)
        {
                myValidationResult  vResult = new myValidationResult();
                vResult.Messages.Add("message 1");
                vResult.Messages.Add("message 2");
                vResult.Messages.Add("message 3");
                vResult.Messages.Add("message 4");
                vResult.IsValidEntity = false;

                 var strResult = JsonConvert.SerializeObject(vResult);
                var resp = Content(HttpStatusCode.BadRequest, strResult );

                return resp;
        }
}

对于消耗这个的客户，我们在类下面创建:

For the client Consuming this, we created below Class:

public class OData<T> 
{
    [JsonProperty("odata.context")]
    public string Metadata { get; set; }
    public T value { get; set; }
}

在我们称为Odata方法&的方法中将响应存储在"msg"中:

In the method where we call the Odata method & store response in 'msg':

var resp = msg.Result.Content.ReadAsStringAsync().Result;

resp是:

"{\r\n  \"@odata.context\":\"http://localhost/ApplicationService/model/$metadata#Edm.String\",\"value\":\"{\\\"Messages\\\":[\\\"message 1\\\",\\\"message 2\\\",\\\"message 3\\\",\\\"message 4\\\"],\\\"IsValidEntity\\\":false}\"\r\n}"


var odatares = JsonConvert.DeserializeObject<OData<myValidationResult>>(resp);

但是上面的行给出了错误:

But the above line giving error:

Can not convert value\":\"{\\\"Messages\\\":[\\\"message 1\\\",\\\"message 2\\\",\\\"message 3\\\",\\\"message 4\\\"],\\\"IsValidEntity\\\":false}  to <.....namespace......>myValidationResult

请相应地提出建议.

推荐答案

OData响应包含一个字符串，而不是myValidationResult的实例.另外，响应看起来好像缺少了一些反斜杠. (您确定显示的响应完全是 您从服务中收到的内容吗?)

The OData response contains a string, not an instance of myValidationResult. Also, the response looks like it's missing some backslashes. (Are you sure the response shown is exactly what you received from the service?)

您可以在服务上修复myValidationResult的序列化:

You can either fix the serialization of myValidationResult on the service:

// Don't serialize vResult yourself. OData will do it for you.
var resp = Content(HttpStatusCode.BadRequest, vResult );

或按以下两个步骤反序列化.

Or deserialize in two steps as follows.

var data = "{\r\n \"@odata.context\":\"http://localhost/ApplicationService/model/$metadata#Edm.String\",\"value\":\"{\\\"Messages\\\":[\\\"message 1\\\",\\\"message 2\\\",\\\"message 3\\\",\\\"message 4\\\"],\\\"IsValidEntity\\\":false}\"\r\n}";
var outer = Newtonsoft.Json.JsonConvert.DeserializeObject<OData<string>>(data);
var inner = Newtonsoft.Json.JsonConvert.DeserializeObject<myValidationResult>(outer.value);

另一件事:OData<T>上的JsonProperty应该命名为@odata.context.

One more thing: The JsonProperty on OData<T> should be named @odata.context.

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