asp.net web api2.0 ajax跨域解决方案

Web Api的优缺点就不说了，直接说怎么跨域，我搜了一下，主要是有两种。

一，ASP.NET Web API支持JSONP，分两种

　　1，利用JsonMediaTypeFormatter，具体参考这里：http://www.cnblogs.com/artech/p/cors-4-asp-net-web-api-03.html

上代码：

新建JsonpMediaTypeFormatter类：

    public class JsonpMediaTypeFormatter : JsonMediaTypeFormatter

    {

        private string callbackQueryParameter;

        public JsonpMediaTypeFormatter()

        {

            SupportedMediaTypes.Add(DefaultMediaType);

            SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/javascript"));

            MediaTypeMappings.Add(new UriPathExtensionMapping("jsonp", DefaultMediaType));

        }

        public string CallbackQueryParameter

        {

            get { return callbackQueryParameter ?? "callback"; }

            set { callbackQueryParameter = value; }

        }

        /// <summary>

        /// 将对象序列化后的JSON字符串填充到JavaScript回调函数中

        /// </summary>

        /// <param name="type"></param>

        /// <param name="value"></param>

        /// <param name="stream"></param>

        /// <param name="content"></param>

        /// <param name="transportContext"></param>

        /// <returns></returns>

        public override Task WriteToStreamAsync(Type type, object value, Stream stream, HttpContent content, TransportContext transportContext)

        {

            string callback;

            if (IsJsonpRequest(out callback))

            {

                return Task.Factory.StartNew(() =>

                {

                    var writer = new StreamWriter(stream);

                    writer.Write(callback + "(");

                    writer.Flush();

                    base.WriteToStreamAsync(type, value, stream, content, transportContext).Wait();

                    writer.Write(")");

                    writer.Flush();

                });

            }

            else

            {

                return base.WriteToStreamAsync(type, value, stream, content, transportContext);

            }

        }

        /// <summary>

        /// 判断是否为跨域请求

        /// </summary>

        /// <param name="callback"></param>

        /// <returns></returns>

        private bool IsJsonpRequest(out string callback)

        {

            callback = null;

            if (HttpContext.Current.Request.HttpMethod != "GET")

                return false;

            callback = HttpContext.Current.Request.QueryString[CallbackQueryParameter];

            return !string.IsNullOrEmpty(callback);

        }

    }

在Global.asax中注册JsonpMediaTypeFormatter

GlobalConfiguration.Configuration.Formatters.Insert(0, new JsonpMediaTypeFormatter());

　　2，利用ActionFilterAttribute ，具体参考这里：http://stackoverflow.com/questions/9421312/jsonp-with-asp-net-web-api/18206518#18206518

　　代码：

新建 JsonCallbackAttribute 类

    public class JsonCallbackAttribute : ActionFilterAttribute

    {

        private const string CallbackQueryParameter = "callback";

        public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)

        {

            var callback = string.Empty;

            if (IsJosnp(out callback))

            {

                var jsonBuilder = new StringBuilder(callback);

                jsonBuilder.AppendFormat("({0})", actionExecutedContext.Response.Content.ReadAsStringAsync().Result);

                actionExecutedContext.Response.Content = new StringContent("C(\"a\")");

            }

            base.OnActionExecuted(actionExecutedContext);

        }

        private bool IsJosnp(out string callback)

        {

            callback = System.Web.HttpContext.Current.Request.QueryString[CallbackQueryParameter];

            return !string.IsNullOrEmpty(callback);

        }

    }

在Global.asax中注册JsonCallbackAttribute

GlobalConfiguration.Configuration.Filters.Add(new JsonCallbackAttribute());

二，使用 Microsoft ASP.NET Web API 2 Cross-Origin Suppor

　　使用 NuGe 安装 Microsoft ASP.NET Web API 2 Cross-Origin Support，这里说的很详细

　　然后在Global.asax中开启针对CORS的支持，EnableCors加不加无影响的样子。

测试实例：

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

    <script src="http://cdn.bootcss.com/jquery/2.1.3/jquery.min.js"></script>

    <title>测试 WebApi 跨域</title>

</head>

<body>

    <form id="form1" runat="server">

        <input type="button" id="btnGet" value="Get 点击跨域查询数据" />

        <div id="bindData">

        </div>

        <input type="button" id="btnPost" value="Post 点击跨域查询数据" />

    </form>

    <script>

        $('#btnGet').bind('click', function (e) {

            $.ajax({

                type: "GET",

                url: "http://localhost:20128/api/UserInfo",

                success: function (data) {

                    var html = "";

                    $.each(data, function (index, val) {

                        html += "<ul><li>GroupName: " + val.Id + " -- " + val.Name + "</li></ul>";

                    });

                    $("#bindData").append(html);

                }

            });

        });

        $('#btnPost').bind('click', function (e) {

            var user = { Id: '1', Name: '233' };

            $.ajax({

                type: "POST",

                contentType: 'application/json; charset=utf-8',

                data: JSON.stringify(user),

                url: "http://localhost:20128/api/UserInfo",

                success: function (data) {

                    //var html = "";

                    //$.each(data, function (index, val) {

                    //    html += "<ul><li>GroupName: " + val.Id + " -- " + val.Name + "</li></ul>";

                    //});

                    //$("#bindData").append(html);

                }

            });

        });

    </script>

</body>

</html>

Ajax请求在Post数据的时候，一定要加上这样项：

contentType: 'application/json; charset=utf-8',

data: JSON.stringify(user),

就这样，只是把网络上有解决方案的整理了一下，放在了一切。

分类: WebApi

标签: WebApi

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asp.net web api2.0 ajax跨域解决方案

asp.net web api2.0 ajax跨域解决方案

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