WebClient 同步阻塞失效 问题

[sjhcsdn]

        public static void LoadContentByXap(string xapname,Action<object> done) {
            var x = new DeploymentCatalog(xapname);
            x.DownloadCompleted += (o, k) => {
                done.Invoke(x.Parts);
            };
            x.DownloadAsync();
        }
        public static void LoadContentByXap(string xapname, string frameworkelementpath, Action<dynamic> carryback) {
            var wc = new WebClient();
            wc.OpenReadCompleted += (s, e) => {
                var vv = new StreamResourceInfo(e.Result, "application/binary");
                AssemblyPart ap = new AssemblyPart();
                var assembly = ap.Load(Application.GetResourceStream(vv, new Uri(xapname + ".dll", UriKind.Relative)).Stream);
                var content = assembly.CreateInstance(xapname + "." + frameworkelementpath);
                if (carryback != null) {
                    carryback.Invoke(content);
                }
            };
            wc.OpenReadAsync(new Uri(xapname + ".xap", UriKind.Relative));
        }

        void CheckBag(IPageBag bag, ref IPageBag bag2) {
            //while (mark != 1) {
            //    Thread.Sleep(100);
            //}
            //Interlocked.Exchange(ref mark, 0);
            //are.WaitOne();
            bag2 = bag;
        }
        public void LoadMudel(string dllname, ref IPageBag bag) {
            if (bag == null) {
                var currentbag = default(IPageBag);
                are.Reset();
                Interlocked.Exchange(ref mark, 0);                
                Ex.LoadContentByXap(dllname+".xap",(object x) => {
                    currentbag = x as IPageBag;
                    are.Set();
                    Interlocked.Exchange(ref mark, 1);
                });
                CheckBag(currentbag, ref bag);
            }
        }

上面这个是silverlight 异步请求一个对象 然后手动同步阻塞的 代码，但可悲的是，同步阻塞造成了死锁
WebClient 对 OpenReadCompleted 或DeploymentCatalog的DeploymentCatalog 全部会因为主线程的手动 等待而 不执行（即死锁）

求解决方案 ～

[sjhcsdn]

        public IPageBag Bag2 {
            get {
                LoadMudel("Bag5", ref bag2);
                return bag2;
            }
        }

        public IPageBag Bag1 {
            get {
                LoadMudel("Bag4", ref bag1);
                return bag1;
            }
        }

[sjhcsdn]

如1楼所示，在使用属性 比如 Bag1,或Bag2时，如果它们为空那么就去 下载并加载它们（远程异步的方式）但是在手动阻塞主线程以试图 等于它们的异步返回结果时 却遭遇了 死锁 求方案，叩谢！

[sjhcsdn]

如1楼所示，在使用属性 比如 Bag1,或Bag2时，如果它们为空那么就去 下载并加载它们（远程异步的方式）但是在手动阻塞主线程以试图 等待它们的异步返回结果时 却遭遇了 死锁 求方案，叩谢！

[icegrue]

手上没有可试的环境，你试试这样行不： 那个DownloadCompleted 是下载完成时的事件吧？

        public static void LoadContentByXap(string xapname,Action<object> done) {
            var x = new DeploymentCatalog(xapname);
            x.DownloadCompleted += (o, k) => {
                done.Invoke(x.Parts);
				are.set();
            };
            x.DownloadAsync();
			are.WaitOne();
        }
        public static void LoadContentByXap(string xapname, string frameworkelementpath, Action<dynamic> carryback) {
            var wc = new WebClient();
            wc.OpenReadCompleted += (s, e) => {
                var vv = new StreamResourceInfo(e.Result, "application/binary");
                AssemblyPart ap = new AssemblyPart();
                var assembly = ap.Load(Application.GetResourceStream(vv, new Uri(xapname + ".dll", UriKind.Relative)).Stream);
                var content = assembly.CreateInstance(xapname + "." + frameworkelementpath);
                if (carryback != null) {
                    carryback.Invoke(content);
                }
            };
            wc.OpenReadAsync(new Uri(xapname + ".xap", UriKind.Relative));
        }

        void CheckBag(IPageBag bag, ref IPageBag bag2) {
            //while (mark != 1) {
            //    Thread.Sleep(100);
            //}
            //Interlocked.Exchange(ref mark, 0);
            //are.WaitOne();
            bag2 = bag;
        }
        public void LoadMudel(string dllname, ref IPageBag bag) {
            if (bag == null) {
                var currentbag = default(IPageBag);
                Interlocked.Exchange(ref mark, 0);                
                Ex.LoadContentByXap(dllname+".xap",(object x) => {
                    currentbag = x as IPageBag;
                    Interlocked.Exchange(ref mark, 1);
                });
                CheckBag(currentbag, ref bag);
            }
        }

[以专业开发人员为伍]

不要阻塞。从设计的“根源”上，就应该改为回调形式。

[sjhcsdn]

不行～～～～～