Ajax请求数据响应格式，一个醒目组必须是同意的，前端才知道怎么应付，还有很多其他情况，比如异常了，有ExceptionFilter，按照固定格式返回，比如没有权限，Authorization，按照固定格式返回。
Http请求的本质：
请求--应答式，响应可以那么丰富？不同的类型其实方式一样的，只不过有个ContenetType的差别，html--text/html、json--application/json、xml/application/xml、js--application/JavaScript、ico--image/x-icon、image/gif、image/jepg、image/png.....
这个等于是Http协议约定，Web框架和浏览器共同支持的。其实就是服务器告诉浏览器如何处理这个数据，从页面下载pdf或者页面展示pdf靠的就是ContentType，application/pdf、application/octet-stream。
MVC各种Result的事，JsonResult实际上就是JsonResult，继承ActionResult，然后重写ExecuteResult方法，指定ContentType为application/json，然后将Data序列化成字符串写入stream，我们可以随意扩展，只需要把数据放到response，指定好ContentType
ContentType对照表：http://tool.oschina.net/commons
/// <summary> /// 返回ActionResult--MVC框架会执行其ExecuteResult方法--- /// </summary> /// <returns></returns> public JsonResult JsonResultIn() { return Json(new AjaxResult() { Result = DoResult.Success, DebugMessage = "这里是JsonResult" }, JsonRequestBehavior.AllowGet); }
比如我们现在来扩展个NewtonJsonResult
public class NewtonJsonResult : ActionResult { private object Data = null; public NewtonJsonResult(object data) { this.Data = data; } public override void ExecuteResult(ControllerContext context) { HttpResponseBase response = context.HttpContext.Response; response.ContentType = "application/json"; response.Write(Newtonsoft.Json.JsonConvert.SerializeObject(this.Data)); } }
调用的时候：
/// <summary> /// 返回ActionResult--MVC框架会执行其ExecuteResult方法--- /// </summary> /// <returns></returns> public NewtonJsonResult JsonResultNewton() { return new NewtonJsonResult(new AjaxResult() { Result = DoResult.Success, DebugMessage = "这里是JsonResult" }); }
AjaxResult：
public class AjaxResult { public AjaxResult() { } public string DebugMessage { get; set; } public string PromptMsg { get; set; } public DoResult Result { get; set; } public object RetValue { get; set; } public object Tag { get; set; } } public enum DoResult { Failed = 0, Success = 1, OverTime = 2, NoAuthorization = 3, Other = 255 }
自定义扩展XMLResult
/// <summary> /// 自定义扩展XML格式result /// </summary> public class XmlResult : ActionResult { private object _data; public XmlResult(object data) { _data = data; } public override void ExecuteResult(ControllerContext context) { var serializer = new XmlSerializer(_data.GetType()); var response = context.HttpContext.Response; response.ContentType = "text/xml"; serializer.Serialize(response.Output, _data); } }
public XmlResult XmlResult() { return new XmlResult(new AjaxResult() { Result = DoResult.Success, DebugMessage = "这里是JsonResult" }); }
现在，我们不写返回值，直接写入stream
/// </summary> public void JsonResultVoid() { HttpResponseBase response = base.HttpContext.Response; response.ContentType = "application/json"; response.Write( Newtonsoft.Json.JsonConvert.SerializeObject(new AjaxResult() { Result = DoResult.Success, DebugMessage = "这里是JsonResult" })); }
来源：博客园
作者：冰乐
链接：https://www.cnblogs.com/taotaozhuanyong/archive/2019/09/23/11575306.html