我們都知道Asp.net MVC自帶的Action可以有多種類型,比如ActionResult,ContentResult,JsonResult……,但是很遺憾沒有支持直接返回XML的XmlResult。當然,你也可以用ActionResult或者ContentResult,然後直接返回xml字元串...
我們都知道Asp.net MVC自帶的Action可以有多種類型,比如ActionResult,ContentResult,JsonResult……,但是很遺憾沒有支持直接返回XML的XmlResult。
當然,你也可以用ActionResult或者ContentResult,然後直接返回xml字元串。
如果我們想要想JsonResult一樣來調用和返回xml結果,我們可以自己新建擴展XmlResult,該怎麼辦呢?不多說,看下麵實例:
第一步,擴展System.Web.Mvc XmlRequestBehavior
/// <summary> /// 擴展System.Web.Mvc XmlRequestBehavior /// 指定是否允許來自客戶端的HTTP GET請求 /// 熊仔其人/// </summary> public enum XmlRequestBehavior { /// <summary> /// HTTP GET requests from the client are allowed. /// 允許來自客戶端的HTTP GET請求 /// </summary> AllowGet = 0, /// <summary> /// HTTP GET requests from the client are not allowed. /// 不允許來自客戶端的HTTP GET請求 /// </summary> DenyGet = 1, }
第二步,實現XmlResult繼承ActionResult
/// <summary> /// 實現XmlResult繼承ActionResult /// 擴展MVC的ActionResult支持返回XML格式結果 /// 熊仔其人/// </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 /// 編碼格式 /// </summary> public Encoding ContentEncoding { get; set; } /// <summary> /// Gets or sets the type of the content. /// 獲取或設置返回內容的類型 /// </summary> public string ContentType { get; set; } /// <summary> /// Gets or sets the data /// 獲取或設置內容 /// </summary> public object Data { get; set; } /// <summary> /// Gets or sets a value that indicates whether HTTP GET requests from the client /// 獲取或設置一個值,指示是否HTTP GET請求從客戶端 /// </summary> public XmlRequestBehavior XmlRequestBehavior { get; set; } /// <summary> /// Enables processing of the result of an action method by a custom type that /// 處理結果 /// </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); // 把數據序列化到記憶體流中 ms.Position = 0; using (StreamReader sr = new StreamReader(ms)) { context.HttpContext.Response.Output.Write(sr.ReadToEnd()); // 輸出流對象 } } } } }
註釋:如果想要修改反序列化後的xml命名空間,可以使用自定義命名空間:
//使用你的定義的命名空間名稱 var ns = new XmlSerializerNamespaces(); ns.Add("xsi", "http://api.xxxx.com/1.0/"); 然後這裡添加自定義命名空間,註意第三個參數 xs.Serialize(ms, Data ,ns); // 把數據序列化到記憶體流中
第三步,擴展System.Mvc.Controller
/// <summary> /// 擴展System.Mvc.Controller /// 熊仔其人/// </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 }; } }
到此就完成啦,下麵就看看怎麼調用:
第四步,在Controller里調用XmlResult
public ActionResult GetActionResult(string type) { var data = new List<string>(); //註意,data必須是可被序列化的內容 data.Add("A"); data.Add("B"); data.Add("C"); if (type.ToLower() == "xml") { return this.Xml(data, 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 = new List<string>(); //註意,data必須是可被序列化的內容 data.Add("A"); data.Add("B"); data.Add("C"); return this.Xml(data, XmlRequestBehavior.AllowGet); }
運行一下,看看實際返回結果吧!
上面的示例運行發揮的結果是這樣:
<?xml version="1.0"?>
<ArrayOfString xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<string>A</string>
<string>B</string>
<string>C</string>
</ArrayOfString>
以下是完整的代碼:
using System; using System.IO; using System.Text; using System.Web; using System.Web.Mvc; using System.Xml.Serialization; namespace Onexz.API.Models { /// <summary> /// 擴展System.Web.Mvc XmlRequestBehavior /// 指定是否允許來自客戶端的HTTP GET請求 /// 熊仔其人/// </summary> public enum XmlRequestBehavior { /// <summary> /// HTTP GET requests from the client are allowed. /// 允許來自客戶端的HTTP GET請求 /// </summary> AllowGet = 0, /// <summary> /// HTTP GET requests from the client are not allowed. /// 不允許來自客戶端的HTTP GET請求 /// </summary> DenyGet = 1, } /// <summary> /// 實現XmlResult繼承ActionResult /// 擴展MVC的ActionResult支持返回XML格式結果 /// 熊仔其人/// </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 /// 編碼格式 /// </summary> public Encoding ContentEncoding { get; set; } /// <summary> /// Gets or sets the type of the content. /// 獲取或設置返回內容的類型 /// </summary> public string ContentType { get; set; } /// <summary> /// Gets or sets the data /// 獲取或設置內容 /// </summary> public object Data { get; set; } /// <summary> /// Gets or sets a value that indicates whether HTTP GET requests from the client /// 獲取或設置一個值,指示是否HTTP GET請求從客戶端 /// </summary> public XmlRequestBehavior XmlRequestBehavior { get; set; } /// <summary> /// Enables processing of the result of an action method by a custom type that /// 處理結果 /// </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); // 把數據序列化到記憶體流中 ms.Position = 0; using (StreamReader sr = new StreamReader(ms)) { context.HttpContext.Response.Output.Write(sr.ReadToEnd()); // 輸出流對象 } } } } } /// <summary> /// 擴展System.Mvc.Controller /// 熊仔其人/// </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 }; } } }