C# IProgress类代码示例

        public async Task Run(IProgress<double> progress, CancellationToken cancellationToken)
        {
            var users = _userManager.Users
                .DistinctBy(ChannelDownloadScheduledTask.GetUserDistinctValue)
                .Select(i => i.Id.ToString("N"))
                .ToList();

            var numComplete = 0;

            foreach (var user in users)
            {
                double percentPerUser = 1;
                percentPerUser /= users.Count;
                var startingPercent = numComplete * percentPerUser * 100;

                var innerProgress = new ActionableProgress<double>();
                innerProgress.RegisterAction(p => progress.Report(startingPercent + (percentPerUser * p)));

                await DownloadContent(user, cancellationToken, innerProgress).ConfigureAwait(false);

                numComplete++;
                double percent = numComplete;
                percent /= users.Count;
                progress.Report(percent * 100);
            }

            progress.Report(100);
        }

        /// <inheritdoc/>
        public async Task<Uri> UploadMessageAsync(Stream content, DateTime expirationUtc, string contentType, string contentEncoding, IProgress<int> bytesCopiedProgress, CancellationToken cancellationToken = default(CancellationToken))
        {
            Requires.NotNull(content, "content");
            Requires.Range(expirationUtc > DateTime.UtcNow, "expirationUtc");

            string blobName = Utilities.CreateRandomWebSafeName(DesktopUtilities.BlobNameLength);
            if (expirationUtc < DateTime.MaxValue)
            {
                DateTime roundedUp = expirationUtc - expirationUtc.TimeOfDay + TimeSpan.FromDays(1);
                blobName = roundedUp.ToString("yyyy.MM.dd") + "/" + blobName;
            }

            var blob = this.container.GetBlockBlobReference(blobName);

            // Set metadata with the precise expiration time, although for efficiency we also put the blob into a directory
            // for efficient deletion based on approximate expiration date.
            if (expirationUtc < DateTime.MaxValue)
            {
                blob.Metadata["DeleteAfter"] = expirationUtc.ToString(CultureInfo.InvariantCulture);
            }

            blob.Properties.ContentType = contentType;
            blob.Properties.ContentEncoding = contentEncoding;

            await blob.UploadFromStreamAsync(content.ReadStreamWithProgress(bytesCopiedProgress), cancellationToken);
            return blob.Uri;
        }

        public async Task InstallPackage(IProgress<double> progress, PackageVersionInfo package, CancellationToken cancellationToken)
        {
            // Target based on if it is an archive or single assembly
            //  zip archives are assumed to contain directory structures relative to our ProgramDataPath
            var isArchive = string.Equals(Path.GetExtension(package.targetFilename), ".zip", StringComparison.OrdinalIgnoreCase);
            var target = Path.Combine(isArchive ? _appPaths.TempUpdatePath : _appPaths.PluginsPath, package.targetFilename);

            // Download to temporary file so that, if interrupted, it won't destroy the existing installation
            var tempFile = await _httpClient.GetTempFile(new HttpRequestOptions
            {
                Url = package.sourceUrl,
                CancellationToken = cancellationToken,
                Progress = progress

            }).ConfigureAwait(false);

            cancellationToken.ThrowIfCancellationRequested();

            // Validate with a checksum
            if (package.checksum != Guid.Empty) // support for legacy uploads for now
            {
                using (var crypto = new MD5CryptoServiceProvider())
                using (var stream = new BufferedStream(File.OpenRead(tempFile), 100000))
                {
                    var check = Guid.Parse(BitConverter.ToString(crypto.ComputeHash(stream)).Replace("-", String.Empty));
                    if (check != package.checksum)
                    {
                        throw new ApplicationException(string.Format("Download validation failed for {0}.  Probably corrupted during transfer.", package.name));
                    }
                }
            }

            cancellationToken.ThrowIfCancellationRequested();

            // Success - move it to the real target 
            try
            {
                File.Copy(tempFile, target, true);
                //If it is an archive - write out a version file so we know what it is
                if (isArchive)
                {
                    File.WriteAllText(target+".ver", package.versionStr);
                }
            }
            catch (IOException e)
            {
                _logger.ErrorException("Error attempting to move file from {0} to {1}", e, tempFile, target);
                throw;
            }

            try
            {
                File.Delete(tempFile);
            }
            catch (IOException e)
            {
                // Don't fail because of this
                _logger.ErrorException("Error deleting temp file {0]", e, tempFile);
            }
        }

		internal static void PushHumptyOffTheWall(IProgress progress, bool writeVerbose, string mainFilePathname)
		{
			Guard.AgainstNull(progress, "progress");
			FileWriterService.CheckFilename(mainFilePathname);

			var rootDirectoryName = Path.GetDirectoryName(mainFilePathname);
			// NB: This is strictly an ordered list of method calls.
			// Don't even 'think' of changing any of them.
			CheckForUserCancelRequested(progress);
			DeleteOldFiles(rootDirectoryName);
			CheckForUserCancelRequested(progress);
			WriteVersionFile(mainFilePathname);
			// Outer Dict has the class name for its key and a sorted (by guid) dictionary as its value.
			// The inner dictionary has a caseless guid as the key and the byte array as the value.
			// (Only has current concrete classes.)
			var classData = GenerateBasicClassData();
			var wellUsedElements = new Dictionary<string, XElement>
				{
					{SharedConstants.LangProject, null},
					{SharedConstants.LexDb, null}
				};
			var guidToClassMapping = WriteOrCacheProperties(mainFilePathname, classData, wellUsedElements);
			CheckForUserCancelRequested(progress);
			BaseDomainServices.PushHumptyOffTheWall(progress, writeVerbose, rootDirectoryName, wellUsedElements, classData, guidToClassMapping);

#if DEBUG
			// Enable ONLY for testing a round trip.
			// FLExProjectUnifier.PutHumptyTogetherAgain(progress, writeVerbose, mainFilePathname);
#endif
		}

        private async Task SyncInternal(ServerInfo server, IProgress<double> progress, CancellationToken cancellationToken)
        {
            _logger.Debug("Beginning ServerSync with server {0}, Id {1}", server.Name, server.Id);
            
            if (string.IsNullOrWhiteSpace(server.AccessToken) && string.IsNullOrWhiteSpace(server.ExchangeToken))
            {
                _logger.Info("Skipping sync process for server " + server.Name + ". No server authentication information available.");
                progress.Report(100);
                return;
            }

            // Don't need these here
            var result = await _connectionManager.Connect(server, new ConnectionOptions
            {
                EnableWebSocket = false,
                ReportCapabilities = false,
                UpdateDateLastAccessed = false

            }, cancellationToken).ConfigureAwait(false);

            if (result.State == ConnectionState.SignedIn)
            {
                await SyncInternal(server, result.ApiClient, progress, cancellationToken).ConfigureAwait(false);
                progress.Report(100);
            }
            else
            {
                _logger.Info("Skipping sync process for server " + server.Name + ". ConnectionManager returned a state of {0}", result.State.ToString());
                progress.Report(100);
            }
        }

        /// <summary>
        /// Runs the specified progress.
        /// </summary>
        /// <param name="progress">The progress.</param>
        /// <param name="cancellationToken">The cancellation token.</param>
        /// <returns>Task.</returns>
        public async Task Run(IProgress<double> progress, CancellationToken cancellationToken)
        {
            var allSongs = _libraryManager.RootFolder
                .GetRecursiveChildren(i => !i.IsFolder && (i is IHasArtist))
                .Cast<IHasArtist>()
                .ToList();

            var allArtists = _libraryManager.GetArtists(allSongs).ToList();

            var numComplete = 0;
            var numArtists = allArtists.Count;

            foreach (var artistItem in allArtists)
            {
                cancellationToken.ThrowIfCancellationRequested();

                try
                {
                    await artistItem.RefreshMetadata(cancellationToken).ConfigureAwait(false);
                }
                catch (IOException ex)
                {
                    _logger.ErrorException("Error validating Artist {0}", ex, artistItem.Name);
                }

                // Update progress
                numComplete++;
                double percent = numComplete;
                percent /= numArtists;

                progress.Report(100 * percent);
            }
        }

        private DataResult<IList<Employee>> LoadEmployees(CancellationToken token, IProgress<double> progress)
        {
            var employees = XDocument.Load(@"data\sampledata.xml")
                .Descendants("Employee")
                .Select(x => new Employee {
                    Number = int.Parse(x.Descendants("Number").First().Value),
                    Name = x.Descendants("Name").First().Value,
                    Surname = x.Descendants("Surname").First().Value,
                    Salary = double.Parse(x.Descendants("Salary").First().Value)
                })
                .ToList();

            var itemIndex = 0;
            var result = new DataResult<IList<Employee>> {
                Result = new List<Employee>()
            };

            try {
                foreach (var employee in employees) {
                    Thread.CurrentThread.Join(100);
                    result.Result.Add(employee);
                    token.ThrowIfCancellationRequested();
                    progress.Report((++itemIndex*100)/employees.Count);
                }
            }
            catch (OperationCanceledException ex) {
                result.Exception = ex;
            }

            return result;
        }

        protected override async Task FillDataTo(System.Net.WebRequest webrqst, CancellationToken cancellationToken, IProgress<ProgressReport> progress)
        {


            progress.ReportWhenNotNull(() => ProgressReport
                .CreateNew(RequestResponseSteps
                .Requesting_N_Uploading, 0, 1));
            var qd = System.Text.Encoding.UTF8.GetBytes(JsonClientHelper.GetQueryData(RequestData.PostFieldValues));

            webrqst.ContentType = "application/x-www-form-urlencoded";
#if SILVERLIGHT_4||SILVERLIGHT_5||DOTNET45

            webrqst.ContentLength = qd.Length;
    
#endif




            var rqstStrm = await webrqst.GetRequestStreamAsync().ConfigureAwait(false);
            await rqstStrm.WriteAsync(qd, 0, qd.Length).ConfigureAwait(false);
            progress.ReportWhenNotNull(() => ProgressReport
                .CreateNew(RequestResponseSteps
                .Requesting_N_Uploading, 1, 1));
        }

 public async Task ExportTexturesAsync(string textureDir, IProgress<string> progress = null, CancellationToken cancellation = default(CancellationToken)) {
     foreach (var texture in Textures.Values) {
         if (cancellation.IsCancellationRequested) return;
         progress?.Report(texture.Name);
         await FileUtils.WriteAllBytesAsync(Path.Combine(textureDir, texture.Name), TexturesData[texture.Name], cancellation);
     }
 }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="cancellationToken"></param>
        /// <param name="progress"></param>
        /// <returns></returns>
        public async Task Execute(CancellationToken cancellationToken, IProgress<double> progress)
        {
            var users = _userManager.Users.Where(u => UserHelper.GetTraktUser(u) != null).ToList();

            // No point going further if we don't have users.
            if (users.Count == 0)
            {
                _logger.Info("No Users returned");
                return;
            }

            // purely for progress reporting
            var percentPerUser = 100 / users.Count;
            double currentProgress = 0;
            var numComplete = 0;

            foreach (var user in users)
            {
                try
                {
                    await SyncTraktDataForUser(user, currentProgress, cancellationToken, progress, percentPerUser).ConfigureAwait(false);

                    numComplete++;
                    currentProgress = percentPerUser * numComplete;
                    progress.Report(currentProgress);
                }
                catch (Exception ex)
                {
                    _logger.ErrorException("Error syncing trakt data for user {0}", ex, user.Name);
                }
            }
        }

		public static bool TryMergeEntries(LexEntry entry1, LexEntry entry2, string[] traitsWithMultiplicity, IProgress progress)
		{
			if (!entry1.LexicalForm.CanBeUnifiedWith(entry2.LexicalForm))
			{
				progress.WriteMessageWithColor("gray","Attempting to merge entries, but could not because their Lexical Forms clash in some writing system.");
				return false;
			}

			if (!SenseMerger.TryMergeProperties(entry1, entry2, traitsWithMultiplicity, "entries for "+entry1.ToString(), progress))
				return false;

			// at this point, we're committed to doing the merge

			entry1.LexicalForm.MergeIn(entry2.LexicalForm);

			var senses = entry2.Senses.ToArray();
			foreach (var sense in senses)
			{
				MergeOrAddSense(entry1, sense, traitsWithMultiplicity, progress);
			}

			if (entry2.ModificationTime > entry1.ModificationTime)
			{
				entry1.ModificationTime = entry2.ModificationTime;
			}

			entry1.IsDirty = true;
			return true;
		}

        private void RunInternal(IProgress<double> progress, CancellationToken cancellationToken)
        {
            var allItems = _libraryManager.RootFolder
                .RecursiveChildren
                .ToList();

            var musicAlbums = allItems
                .OfType<MusicAlbum>()
                .ToList();

            AttachMovieSoundtracks(allItems, musicAlbums, cancellationToken);

            progress.Report(25);

            AttachTvSoundtracks(allItems, musicAlbums, cancellationToken);

            progress.Report(50);

            AttachGameSoundtracks(allItems, musicAlbums, cancellationToken);

            progress.Report(75);

            AttachAlbumLinks(allItems, musicAlbums, cancellationToken);

            progress.Report(100);
        }

        private void ExtractImage(List<WriteableBitmap> tempTiles, BitmapSource image, int spacing, int offset, IProgress<ProgressDialogState> progress = null)
        {
            var sourceImage = BitmapFactory.ConvertToPbgra32Format(image);

            var jump = 16 + spacing;
            var totalTiles = ((image.PixelWidth - offset) / jump) * ((image.PixelHeight - offset) / jump);
            var currentTile = 0;

            for (var y = offset; y < image.PixelHeight; y += jump)
            {
                for (var x = offset; x < image.PixelWidth; x += jump)
                {
                    var tileImage = new WriteableBitmap(16, 16, 96, 96, PixelFormats.Pbgra32, null);
                    tileImage.Blit(new System.Windows.Rect(0, 0, 16, 16), sourceImage, new System.Windows.Rect(x, y, 16, 16));
                    tempTiles.Add(tileImage);

                    currentTile++;
                    if (progress != null)
                    {
                        progress.Report(new ProgressDialogState() {
                            ProgressPercentage = currentTile * 100 / totalTiles,
                            Description = string.Format("Extracting {0} / {1}", currentTile, totalTiles)
                        });
                    }
                }
            }
        }

 public Task DoAsync(IProgress<int> Progress)
 {
     Progress.Report(1);
     Thread.Sleep(800);
     Progress.Report(95);
     return Task.FromResult<object>(null);
 }

        /// <summary>
        /// Runs the specified progress.
        /// </summary>
        /// <param name="progress">The progress.</param>
        /// <param name="cancellationToken">The cancellation token.</param>
        /// <returns>Task.</returns>
        public async Task Run(IProgress<double> progress, CancellationToken cancellationToken)
        {
            var files = _libraryManager.GetAllIntroFiles().ToList();

            var numComplete = 0;

            foreach (var file in files)
            {
                cancellationToken.ThrowIfCancellationRequested();

                try
                {
                    await RefreshIntro(file, cancellationToken).ConfigureAwait(false);
                }
                catch (OperationCanceledException)
                {
                    throw;
                }
                catch (Exception ex)
                {
                    _logger.ErrorException("Error refreshing intro {0}", ex, file);
                }

                numComplete++;
                double percent = numComplete;
                percent /= files.Count;
                progress.Report(percent * 100);
            }
        }