.NET MVC5简介（三）Result

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：

/// <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"
        }));
}