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());
});