mvc 返回 xml

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.Mvc;
using System.Xml.Serialization;
namespace PaiXie.Pos.Admin {
        /// <summary>
        /// 扩展System.Web.Mvc XmlRequestBehavior
        /// 指定是否允许来自客户端的HTTP GET请求
        ///</summary>
        public enum XmlRequestBehavior {
            /// <summary>
            /// HTTP GET requests from the client are allowed.
            /// 允许来自客户端的HTTP GET请求
            /// </summary>      
            AllowGet = 0,
            /// <summary>
            /// HTTP GET requests from the client are not allowed.
            /// 不允许来自客户端的HTTP GET请求
            /// </summary>
            DenyGet = 1,
        }
        /// <summary>
        /// 实现XmlResult继承ActionResult
        /// 扩展MVC的ActionResult支持返回XML格式结果
        /// </summary>
        public class XmlResult : ActionResult {
            /// <summary>
            /// Initializes a new instance of the System.Web.Mvc.XmlResult class
            /// 初始化
            /// </summary>         
            public XmlResult() { }
            /// <summary>
            /// Encoding
            /// 编码格式
            /// </summary>
            public Encoding ContentEncoding { get; set; }
            /// <summary>
            /// Gets or sets the type of the content.
            /// 获取或设置返回内容的类型
            /// </summary>
            public string ContentType { get; set; }
            /// <summary>
            /// Gets or sets the data
            /// 获取或设置内容
            /// </summary>
            public object Data { get; set; }
            /// <summary>
            /// Gets or sets a value that indicates whether HTTP GET requests from the client
            /// 获取或设置一个值,指示是否HTTP GET请求从客户端
            /// </summary>
            public XmlRequestBehavior XmlRequestBehavior { get; set; }
            /// <summary>
            /// Enables processing of the result of an action method by a custom type that
            /// 处理结果
            /// </summary>
            /// <param name="context"></param>
            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)) {
                            context.HttpContext.Response.Output.Write(sr.ReadToEnd()); // 输出流对象 
                        }
                    }
                }
            }
        }
        /// <summary>
        /// 扩展System.Mvc.Controller
        /// </summary>
        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); }
            public static XmlResult Xml(this Controller request, object obj, Encoding contentEncoding, XmlRequestBehavior behavior) { return Xml(obj, null, contentEncoding, behavior); }
            public static XmlResult Xml(this Controller request, object obj, string contentType, Encoding contentEncoding, XmlRequestBehavior behavior) { return Xml(obj, contentType, contentEncoding, behavior); }
            internal static XmlResult Xml(object data, string contentType, Encoding contentEncoding, XmlRequestBehavior behavior) { return new XmlResult() { ContentEncoding = contentEncoding, ContentType = contentType, Data = data, XmlRequestBehavior = behavior }; }
        }    
}

测试

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace PaiXie.Pos.Admin
{
    /// <summary>
    /// mvc  返回 xml 扩展
    /// </summary>
    [AllowAnonymous]
    [MvcMenuFilter(false)]
    public class TestXmlController : Controller
    {
        // GET: /TestXml/GetActionResult?type=xml 
        public ActionResult GetActionResult(string type) {
            var data = new List<string>(); //注意，data必须是可被序列化的内容
            data.Add("A");
            data.Add("B");
            data.Add("C");
            a aa = new a();
            aa.a1 = "001";
            b bb = new b();
            bb.b1 = "001001";
            aa.a2 = bb;
            if (type.ToLower() == "xml") {
                return this.Xml(aa, XmlRequestBehavior.AllowGet);
            }
            else if (type.ToLower() == "json") {
                return Json(aa, JsonRequestBehavior.AllowGet);
            }
            else {                  //error messages              
                return View("不支持此方法");
            }
        }

        public XmlResult GetXml() {
            var data = new List<string>(); //注意，data必须是可被序列化的内容
            data.Add("A");
            data.Add("B");
            data.Add("C");
            return this.Xml(data, XmlRequestBehavior.AllowGet);
        }
    }
    public class a {
        public string a1 { get; set; }
        public b a2 { get; set; }
    }
    public class b {
        public string b1 { get; set; }
    }
}