返回从网页API C＃

Question

响应数组我试图创建一个Web API，它调用其他服务，并返回响应的阵列。被叫服务返回响应。我能够从被叫服务中获取单个项目。但不知道如何构建数组项并返回来自我创建的API的响应。

的JSON从服务返回的样子

{ 
"cr_response": { 
    "details": [{ 
     "name": "Req", 
     "fields": [{ 
       "value": "Prj0\r\nPrj1", 
       "name": "Project" 
      }, 
      { 
       "value": "October 13, 2017 14:18", 
       "name": "Submitted" 
      }, 
      { 
       "value": "John", 
       "name": "Rec Name" 
      } 
     ] 
    }], 
    "cr_metadata": {} 
} 
} 

而POCO类看起来像

public class Field 
{ 
    public string value { get; set; } 
    public string name { get; set; } 
} 

public class Detail 
{ 
    public string name { get; set; } 
    public List<Field> fields { get; set; } 
} 

public class CrMetadata 
{ 
} 

public class CrResponse 
{ 
    public List<Detail> details { get; set; } 
    public CrMetadata cr_metadata { get; set; } 
} 

public class RootObject 
{ 
     public CrResponse cr_response { get; set; } 
} 

下面是调用服务和检索来自服务的响应代码

var response = await iLab_client.GetAsync(uri); 
var datafile = await response.Content.ReadAsStringAsync(); 
var returnDataObj = JsonConvert.DeserializeObject<DTO.RootObject>(datafile); 

foreach (var form in returnDataObj.cr_response.details) 
{ 
    name_response = form.name; 
    return Ok(name_response); 
} 

在这里，我可以从细节访问的名字，但不知道如何我可以访问字段中的所有名称和值并将其构造成一个数组。并将其作为JSON响应发送。 我试着像

  foreach (var form in returnDataObj.cr_response.details) 
      { 
       var id_response = form.fields; 
       return Ok(id_response); 
      } 

但它抛出错误，如

<Error> 
<Message>An error has occurred.</Message> 
<ExceptionMessage> 
The 'ObjectContent`1' type failed to serialize the response body for content 
type 'application/xml; charset=utf-8'. 
</ExceptionMessage> 

System.InvalidOperationException

Answer 1

返回从您需要填写您的阵列外返回它foreach循环网络API阵列：

var list = new List<string>(); 
foreach (...){ 
    var name = ... 
    list.Add(name); 
} 
return Ok(list.ToArray()); // or just return Ok(list); 

这是豪w ^反序列化JSON到POCO并获得名称列表：

[TestMethod] 
public void TestJsonToPocoAndGetNames() 
{ 
    const string Json = @" 
     { 
     ""cr_response"": { 
      ""details"": [{ 
       ""name"": ""Req"", 
       ""fields"": [{ 
         ""value"": ""Prj0\r\nPrj1"", 
         ""name"": ""Project"" 
        }, 
        { 
         ""value"": ""October 13, 2017 14:18"", 
         ""name"": ""Submitted"" 
        }, 
        { 
         ""value"": ""John"", 
         ""name"": ""Rec Name"" 
        } 
       ] 
      }], 
      ""cr_metadata"": {} 
     } 
    } 
    "; 

    var settings = new JsonSerializerSettings 
    { 
     MetadataPropertyHandling = MetadataPropertyHandling.Ignore, 
     DateParseHandling = DateParseHandling.None, 
    }; 
    var response = JsonConvert.DeserializeObject<RootJsonObject>(Json, settings); 

    var names = new List<string>(); 
    foreach (var detail in response.CrResponse.Details) 
    { 
     names.Add(detail.Name); 

     foreach (var field in detail.Fields) 
     { 
      names.Add(field.Name); 
     } 
    } 

    Assert.AreEqual(
     "Req, Project, Submitted, Rec Name", 
     string.Join(", ", names.ToArray())); 
} 

POCO类：

public class RootJsonObject 
{ 
    [JsonProperty("cr_response")] 
    public CrResponse CrResponse { get; set; } 
} 

public class CrResponse 
{ 
    [JsonProperty("cr_metadata")] 
    public CrMetadata CrMetadata { get; set; } 

    [JsonProperty("details")] 
    public Detail[] Details { get; set; } 
} 

public class CrMetadata 
{ 
} 

public class Detail 
{ 
    [JsonProperty("fields")] 
    public Field[] Fields { get; set; } 

    [JsonProperty("name")] 
    public string Name { get; set; } 
} 

public class Field 
{ 
    [JsonProperty("name")] 
    public string Name { get; set; } 

    [JsonProperty("value")] 
    public string Value { get; set; } 
}