C# 使用XML格式的WCF服务

我有一个MediaServiceLoop.svc文件，它有一个函数GetMediaLoops，如下所示

[WebInvoke(Method = "POST",
     BodyStyle = WebMessageBodyStyle.Wrapped,
     ResponseFormat = WebMessageFormat.Xml)]
        public string GetMediaLoops()
        {
            string strFileName = "GetMediaLoops_response.xml";
            string strResult = GetFileData(strFileName);
            return strResult;
        }`

代码的角度是这样的`

mainApp.factory('MediaService', ['$http', function ($http) {

    var factory = {};
    factory.getMediaLoops = function () {

        return $http.post("http://localhost:62467/MediaLoopService.MediaLoop.svc/GetMediaLoops");
    }
    return factory;}]);

控制器代码：

MediaService.getMediaLoops()
            .then(function (response) {
                $scope.media = response.data;
            }, function (error) {
                $scope.status = 'Unable to load customer data: ' + error.message;
            });

`

我能够在Postman和Chrome Network（）中获得响应，但是我确实收到错误“请求的资源上不存在“Access Control Allow Origin”头。因此不允许访问Origin“”。并且代码流跳过getMediaLoops调用中的响应和错误块

我还为上面的错误在Global.asax文件中添加了以下代码，但仍然得到上面的错误，如有任何帮助，将不胜感激

 protected void Application_BeginRequest(object sender, EventArgs e)
        {
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "http://localhost");
            if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
            {
                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "POST, PUT, DELETE");

                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
                HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000");
                HttpContext.Current.Response.End();
            }

        }

---

尝试在web.config中为服务添加以下配置：

<system.webServer>
    <httpProtocol>
        <customHeaders>
             <add name="Access-Control-Allow-Origin" value="*" />
        </customHeaders>
    </httpProtocol>    

     <modules runAllManagedModulesForAllRequests="true"/>  
     <directoryBrowse enabled="true"/>
</system.webServer>

---

尽管当在API中不传递任何参数时，上述答案工作正常，但对于传递数据，WCF未能作为浏览器创建的飞行前请求的一部分响应选项请求，并抛出错误“方法不允许：405”，因此，永久性的解决方案是在服务项目中创建一个全局文件，检查选项请求并相应地添加标题

public class Global : System.Web.HttpApplication
{

    protected void Application_BeginRequest(object sender, EventArgs e)
    {
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");
        if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
        {
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
            HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000");
            HttpContext.Current.Response.End();
        }
    }

}