Silverlight parallel download and serial download

After a clear line of thought, you can easily write a complete set of resource dynamic download components -Serialdownloader and Paralleldownloader, which share a complete resource table, and the serial download integrates the priority mechanism (hundred downloadpriority), parallel download also encapsulates the parallel queue pattern (queueparalleldownloader) as needed:

Downloadbase/// <summary>    ///Downloader base class/// </summary>     Public classDownloadbase {protected ReadOnly Staticlist<string> Loadeduri =Newlist<string>(); /// <summary>        ///get the downloaded completed address/// </summary>         Public Staticlist<string> Loadeduri {Get{returnLoadeduri;} }        /// <summary>        ///Download failed (error) Number of times/// </summary>         Public Static intError {Get;protected Set; } }

Paralleldownloader//<summary>///Parallel Resource downloader///</summary> public sealed class Paralleldownloader : downloadbase {//<summary>////</summary> public event triggered in resource download progress Download        Progresschangedeventhandler downloadprogresschanged; <summary>///Resources Download complete///</summary> public event Openreadcompletedeventhandler Openre        adcompleted; <summary>///Current progress percentage///</summary> public static int Progresspercentage {get; priv Ate set;        } readonly static list<string> Loadinguri = new list<string> ();        readonly static list<string> Waitinguri = new list<string> (); <summary>///Get the address currently being downloaded///</summary> public static list<string> Loadinguri        {get {return loadinguri;}} <summary>///Get waiting queue///</summary> public static list&Lt;string> Waitinguri {get {return waitinguri;}} <summary>///download resource files///</summary>//<param name= "uri" > Resource relative Address <</param&        Gt <param name= "Usertoken" > Resource parameters </param>//<param name= "Waitingtime" > if it is being downloaded, wait for detection time (in milliseconds) </ param> public void OpenReadAsync (string Uri, Object usertoken, bool iswaiting, int waitingtime) {if (Loadeduri.contains (URI))            {Download (URI, usertoken);                    } else {if (Loadinguri.contains (URI)) {//If the resource is being downloaded, wait for it to be detected every 1 seconds if it has been downloaded if (iswaiting) {DispatcherTimer timer = new DispatcherTimer () {Interval = Timespan.frommil                        Liseconds (Waitingtime)};                        EventHandler handler = null; Timer.                                Tick + = Handler = (s, e) + = {if (Loadeduri.contains (URI)) { Timer. STop (); Timer.                                Tick-= handler;                            Download (URI, usertoken);                        }                        }; Timer.                    Start ();                    }} else {if (!waitinguri.contains (URI)) {Waitinguri.add (URI)};}                    Loadinguri.add (URI);                Download (URI, usertoken); }}}///<summary>//Start download///</summary>//<param name= " URI "> Resource relative Address </param>//<param name=" Usertoken "> Resource parameter </param> void Download (String uri,            Object usertoken) {Openreadcompletedeventhandler openreadcompletedhandler = null;            Downloadprogresschangedeventhandler progresschangedhandler = null;            WebClient WebClient = new WebClient ();                Webclient.downloadprogresschanged + = Progresschangedhandler = (s, e) + = {Progresspercentage = E.progresspercentage;            if (downloadprogresschanged! = null) {downloadprogresschanged (this, e);}            };                webclient.openreadcompleted + = Openreadcompletedhandler = (s, e) + = {WebClient WC = s as webClient; Wc.                DownloadProgressChanged-= Progresschangedhandler; Wc.                openreadcompleted-= Openreadcompletedhandler;                    if (e.error! = null) {//Off-screen processing, retry after 5 seconds error++;                    Globalmethod.settimeout (Delegate {Download (URI, usertoken);                }, 5000);                    } else {waitinguri.remove (URI);                    Loadinguri.remove (URI);                    if (!loadeduri.contains (URI)) {Loadeduri.add (URI);}                if (openreadcompleted! = null) {openreadcompleted (this, e);}            }            }; Webclient.openreadasync (new Uri (URI, Urikind.relative), usertoken); }    }

 

Serialdownloader//<summary>///Download priority///</summary> public enum Downloadpriority {//        <summary>///maximum//</summary> highest = 0,//<summary>//High </summary> high = 1,///<summary>//General//</summary> Norm        Al = 2,///<summary>////</summary> low = 3,///<summary> Minimum//</summary> Lowest = 4,}///////&LT;/SUMMARY&G///serial Resource Downloader    T        public class Serialdownloader:downloadbase {//<summary>//Resources download completed///</summary>        public static event Openreadcompletedeventhandler openreadcompleted; <summary>///</summary> public static event Downloadprogresschangedeve in download progress of resources        Nthandler downloadprogresschanged; <summary&gT        Current progress percentage//</summary> public static int Progresspercentage {get; private set;}        static WebClient WebClient = null;        readonly static list<string> Loadinguri = new list<string> ();        readonly static list<string> Waitinguri = new list<string> (); <summary>///Get the address currently being downloaded///</summary> public static list<string> Loadinguri        {get {return loadinguri;}}  <summary>///Get waiting queue///</summary> public static list<string> Waitinguri {get        {return waitinguri;}} <summary>////Set up an image source for the image control///</summary>//<param name= "image" > Target picture </p aram>//<param name= "uri" > Image source Address </param>//<param name= "iswaiting" > whether to wait for the download to be completed before assigning a value </ param> public static void Setimagesource (image image, string Uri, downloadpriority priority, BOOL Iswaiting) {if (Loadeduri.contains (URI)) {image.            Source = Globalmethod.getwebimage (URI); } else {image.                Source = null;                Adduri (URI, priority); if (iswaiting) {DispatcherTimer timer = new DispatcherTimer () {Interval = Timespan.frommilliseconds (2                    000)};                    EventHandler handler = null; Timer. Tick + = Handler = (s, e) + = {if (Loadeduri.contains (URI)) {timer.                            Stop (); Timer.                            Tick-= handler; Image.                        Source = Globalmethod.getwebimage (URI);                    }                    }; Timer.                Start (); }}}///<summary>//Add preparation///</summary>//<param name= "        Uri > Image source address </param> public static void Adduri (string uri, downloadpriority priority) {    if (!waitinguri.contains (URI)) {Waitinguri.insert ((int) ((int) priority/4d) * waitinguri.count), URI);                if (Loadinguri.count = = 0) {webClient = new webClient ();                Webclient.downloadprogresschanged + = new Downloadprogresschangedeventhandler (webclient_downloadprogresschanged);                webclient.openreadcompleted + = new Openreadcompletedeventhandler (webclient_openreadcompleted);                Webclient.openreadasync (New Uri (Globalmethod.webpath (URI), urikind.relative), URI);            Loadinguri.add (URI); }} static void Webclient_openreadcompleted (object sender, Openreadcompletedeventargs e) {webcli            ENT WC = sender as WebClient; Wc.            DownloadProgressChanged-= webclient_downloadprogresschanged; Wc.            openreadcompleted-= webclient_openreadcompleted;            String uri = E.userstate.tostring (); if (e.error! = null) {//Off-screen processing, retry after 5 seconds Error++;                    Globalmethod.settimeout (Delegate {loadinguri.remove (URI);                Adduri (URI, downloadpriority.highest);            }, 5000);                } else {loadinguri.remove (URI);                Waitinguri.remove (URI);                Loadeduri.add (URI);                if (Waitinguri.count > 0) {adduri (waitinguri[0], downloadpriority.highest);}            if (openreadcompleted! = null) {openreadcompleted (sender, E);}            }} static void Webclient_downloadprogresschanged (object sender, DownloadProgressChangedEventArgs e) {            Progresspercentage = E.progresspercentage;        if (downloadprogresschanged! = null) {downloadprogresschanged (sender, E);} }    }

Silverlight parallel download and serial download