WebApi返回数据类型针对部分api设置json格式数据风格

在全局设置webapi设置json返回类型首字母小写：config.Formatters.JsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();

但是想针对个别api设置默认的json格式，怎么办呢？

下面是一种方案：

第一步：自定义一个消息处理程序

/// <summary>
    /// 自定义http消息处理程序
    /// </summary>
    public class MessageHandlerOne : DelegatingHandler
    {
        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
        
            if (request.RequestUri.AbsolutePath.Contains("api地址中使用默认的标识"))//如api/ddd
                request.GetConfiguration().Formatters.JsonFormatter.SerializerSettings.ContractResolver = new DefaultContractResolver();
            else
                request.GetConfiguration().Formatters.JsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
            return base.SendAsync(request, cancellationToken);

        }
  
    }

第二步：将自定义消息处理程序加的GlobalConfiguration中

GlobalConfiguration.Configure(config =>
{
config.MessageHandlers.Add(new MessageHandlerOne());
});