返回带有小写首字母属性名称的json

Question

我有LoginModel:

public class LoginModel : IData
{
    public string Email { get; set; }
    public string Password { get; set; }
}

我有Web api方法

public IHttpActionResult Login([FromBody] LoginModel model)
{
    return this.Ok(model);
}

它返回200和身体:

{
    Email: "dfdf",
    Password: "dsfsdf"
}

但是我希望能够获得较低的首字母属性

{
    email: "dfdf",
    password: "dsfsdf"
}

我有Json合同解析器进行纠正

public class FirstLowerContractResolver : DefaultContractResolver
{
    protected override string ResolvePropertyName(string propertyName)
    {
        if (string.IsNullOrWhiteSpace(propertyName))
            return string.Empty;

        return $"{char.ToLower(propertyName[0])}{propertyName.Substring(1)}";
    }
}

我怎么能申请这个？

Answer 1

为了强制从api返回的所有json数据到camel case,使用默认的camel case合约解析器更容易使用Newtonsoft Json.

创建一个类似这样的类:

using Newtonsoft.Json.Serialization;

internal class JsonContentNegotiator : IContentNegotiator
{
    private readonly JsonMediaTypeFormatter _jsonFormatter;

    public JsonContentNegotiator(JsonMediaTypeFormatter formatter)
    {
        _jsonFormatter = formatter;          
        _jsonFormatter.SerializerSettings.ContractResolver =
            new CamelCasePropertyNamesContractResolver();
    }

    public ContentNegotiationResult Negotiate(Type type, HttpRequestMessage request, IEnumerable<MediaTypeFormatter> formatters)
    {
        return new ContentNegotiationResult(_jsonFormatter, new MediaTypeHeaderValue("application/json"));
    }
}

并在api配置期间(启动时)设置此项:

var jsonFormatter = new JsonMediaTypeFormatter();
httpConfiguration.Services.Replace(typeof(IContentNegotiator), new JsonContentNegotiator(jsonFormatter));

Answer 2

如果您使用的是Newtonsoft.Json,则可以将JsonProperties添加到视图模型中:

public class LoginModel : IData
{
     [JsonProperty(PropertyName = "email")]
     public string Email {get;set;}

     [JsonProperty(PropertyName = "password")]
     public string Password {get;set;}
}

Answer 3

可以在web API的配置或者启动文件中添加如下两条语句

使用 Newtonsoft.Json；
使用 Newtonsoft.Json.Serialization；

GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.Formatting = Formatting.Indented;

但是使用方法而不是其他方法非常重要；这是行不通的。return Ok()return Json()

如果您必须使用 Json 方法（并且别无选择），请参阅此答案/sf/answers/2027235381/

Answer 4

如果您仅在某个特定位置而不是整个应用程序中需要它，那么您可以执行以下操作：

var objectToSerialize = new {Property1 = "value1", SubOjbect = new { SubObjectId = 1 }};
var json = Newtonsoft.Json.JsonConvert.SerializeObject(data, new JsonSerializerSettings { ContractResolver = new Newtonsoft.Json.Serialization.CamelCasePropertyNamesContractResolver() });

它应该导致{"property1":"value1","subOjbect":{"subObjectId":1}}（请注意，嵌套属性也从小写字母开始）