扩展Controller实现XmlResult以返回XML格式数据

1. 扩展System.Web.Mvc XmlRequestBehavior

namespace System.Web.Mvc
{
    public enum XmlRequestBehavior
    {
        // Summary:
        //     HTTP GET requests from the client are allowed.
        AllowGet = 0,
        //
        // Summary:
        //     HTTP GET requests from the client are not allowed.
        DenyGet = 1,
    }
}

　　

2. 实现XmlResult继承ActionResult

namespace System.Web.Mvc
{
    public class XmlResult:ActionResult
    {
        // Summary:
        //     Initializes a new instance of the System.Web.Mvc.JsonResult class.
        public XmlResult() { }


        public Encoding ContentEncoding { get; set; }
        //
        // Summary:
        //     Gets or sets the type of the content.
        //
        // Returns:
        //     The type of the content.
        public string ContentType { get; set; }
        //
        // Summary:
        //     Gets or sets the data.
        //
        // Returns:
        //     The data.
        public object Data { get; set; }
        //
        // Summary:
        //     Gets or sets a value that indicates whether HTTP GET requests from the client
        //     are allowed.
        //
        // Returns:
        //     A value that indicates whether HTTP GET requests from the client are allowed.
        public XmlRequestBehavior XmlRequestBehavior { get; set; }

        // Summary:
        //     Enables processing of the result of an action method by a custom type that
        //     inherits from the System.Web.Mvc.ActionResult class.
        //
        // Parameters:
        //   context:
        //     The context within which the result is executed.
        //
        // Exceptions:
        //   System.ArgumentNullException:
        //     The context parameter is null.
        public override void ExecuteResult(ControllerContext context)
        {
            if (context == null)
            {
                throw new ArgumentNullException("context");
            }
            HttpRequestBase request = context.HttpContext.Request;
            if (XmlRequestBehavior == XmlRequestBehavior.DenyGet && string.Equals(context.HttpContext.Request.HttpMethod,"GET",StringComparison.OrdinalIgnoreCase))
            {
                throw new InvalidOperationException("XmlRequest_GetNotAllowed");
            }
            HttpResponseBase response = context.HttpContext.Response;
            response.ContentType = !string.IsNullOrEmpty(this.ContentType) ? this.ContentType : "application/xml";
            if (this.ContentEncoding != null)
            {
                response.ContentEncoding = this.ContentEncoding;
            }

            if (Data != null)
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    XmlSerializer xs = new XmlSerializer(Data.GetType());
                    xs.Serialize(ms, Data); // 把数据序列化到内存流中
                    ms.Position = 0;
                    using (StreamReader sr = new StreamReader(ms))
                    {
                        // 输出流对象
                        context.HttpContext.Response.Output.Write(sr.ReadToEnd());
                    }
                }
            }
            

        }


    }
}

　　

3. 扩展System.Mvc.Controller

namespace System.Web.Mvc
{
    public static class ControllerExtension
    {
        public static XmlResult Xml(this Controller request, object obj)
        {
            return Xml(obj, null, null, XmlRequestBehavior.DenyGet);
        }

        public static XmlResult Xml(this Controller request, object obj, XmlRequestBehavior behavior)
        {
            return Xml(obj, null, null, behavior);
        }

        internal static XmlResult Xml(object data, string contentType, Encoding contentEncoding, XmlRequestBehavior behavior)
        {
            return new XmlResult()
            {
                ContentEncoding = contentEncoding,
                ContentType = contentType,
                Data = data,
                XmlRequestBehavior = behavior
            };
        }

    }
}

 

4 Controller调用

public ActionResult Index()
        {
            return View();
        }

        public ActionResult GetActionResult(string type)
        {
            var data = GetData();
            if (type.ToLower() == "xml")
            {
                return this.Xml(null, XmlRequestBehavior.AllowGet);
            }
            else if (type.ToLower() == "json")
            {
                return Json(data, JsonRequestBehavior.AllowGet);
            }
            else
            {
                //error messages
                return View("不支持此方法");
            }
        }

        public XmlResult GetXml()
        {
            var data = GetData();
            return this.Xml(data,XmlRequestBehavior.AllowGet);
        }


        public JsonResult GetJson()
        {
            var data = GetData();
            return Json(data, JsonRequestBehavior.AllowGet);
        }

        public List<User> GetData()
        {
            List<User> users = new List<User>();
            users.Add(new User("sikai", "cao", '1', new DateTime(1984, 4, 4)));
            users.Add(new User("sikai", "cao", '1', new DateTime(1984, 4, 5)));
            users.Add(new User("sikai", "cao", '1', new DateTime(1984, 4, 6)));
            users.Add(new User("sikai", "cao", '1', new DateTime(1984, 4, 7)));
            return users;
        }