C# ImageSize类代码示例

		private string GetRelativeUrl(IEntryImageInformation picture, ImageSize size) {
			if (picture.Version > 0) {
				return string.Format("/img/{0}/main{1}/{2}{3}?v={4}", picture.EntryType.ToString().ToLowerInvariant(), GetDir(size), picture.Id, 
					ImageHelper.GetExtensionFromMime(picture.Mime), picture.Version);
			} else
				return string.Format("/img/{0}/main{1}/{2}{3}", picture.EntryType.ToString().ToLowerInvariant(), GetDir(size), picture.Id, ImageHelper.GetExtensionFromMime(picture.Mime));
		}

        public static string GetProjectImage(string projectId, ImageSize imageType = ImageSize.Normal)
        {
            using (var session = MvcApplication.Store.OpenSession())
            {
                using (session.Advanced.DocumentStore.AggressivelyCacheFor(TimeSpan.FromMinutes(1000)))
                {
                    var project = session.Load<Project>(projectId);

                    if (project == null)
                        return NOIMAGE_URL;

                    if (project.Image == null)
                        return NOIMAGE_URL;

                    switch (imageType)
                    {
                        case ImageSize.Normal:
                            return string.IsNullOrEmpty(project.Image.Logo) ? NOIMAGE_URL : project.Image.Logo;
                        case ImageSize.Icon:
                            return string.IsNullOrEmpty(project.Image.Icon) ? NOIMAGE_URL : project.Image.Icon;
                        case ImageSize.Banner:
                            return string.IsNullOrEmpty(project.Image.Banner) ? NOIMAGE_URL : project.Image.Banner;
                        case ImageSize.BannerThumb:
                            return string.IsNullOrEmpty(project.Image.Banner) ? NOIMAGE_BANNER : project.Image.Thumbnail;
                    }
                }
            }

            return NOIMAGE_URL;
        }

        /// <summary>
        /// Download image.
        /// </summary>
        /// <param name="imagePath">The image path.</param>
        /// <param name="imageExtension">The image extension.</param>
        /// <param name="imageSize">The image size.</param>
        /// <param name="callback">The callback.</param>
        /// <returns>A coroutine.</returns>
        public IEnumerator DownloadImage(
            string imagePath,
            string imageExtension,
            ImageSize imageSize,
            Action<IResult<Texture2D>> callback)
        {
            string imageSizeURIPart = this.GetImageSize(imageSize);
            string requestUri = string.Concat(imagePath, "/", imageSizeURIPart, ".", imageExtension);

            WWW request = this.webRequestor.PerformGetRequest(requestUri);

            yield return request;

            IResult<Texture2D> result = null;

            if (request != null &&
                string.IsNullOrEmpty(request.error))
            {
                result = new Result<Texture2D>(request.texture);
            }
            else
            {
                result = new Result<Texture2D>(request.error);
            }

            callback(result);
        }

        public Task<byte[]> GetDeviceImageAsync(string id, ImageSize size = ImageSize.Small)
        {
            if (string.IsNullOrEmpty(id))
                throw new ArgumentException("Device id is required");

            string action = Map[typeof(Device)];
            var request = GetRequest(Request(action, id, "image"), Method.GET);
            request.AddParameter("size", size);

            var tcs = new TaskCompletionSource<byte[]>();
            try
            {
                RestClient.ExecuteAsync(request, response =>
                    {
                        if (response.StatusCode == HttpStatusCode.OK)
                            tcs.SetResult(response.RawBytes);
                        else
                            tcs.SetResult(null);
                    });
            }
            catch(Exception ex)
            {
                tcs.SetException(ex);
            }
            return tcs.Task;
        }

 public static MvcHtmlString ProductImage(this HtmlHelper helper, string rawFile, ImageSize size, bool noCaching, object htmlAttributes)
 {
     var imgSizeIndicator = System.Enum.GetName(typeof(ImageSize), size);
     var imgFile = UrlHelper.GenerateContentUrl(string.Format("~/Images/Products/{0}", rawFile), helper.ViewContext.HttpContext);
     TagBuilder tb = new TagBuilder("img");
     if (noCaching)
         tb.MergeAttribute("src", imgFile + "?" + new Random().NextDouble().ToString(CultureInfo.InvariantCulture));
     else
         tb.MergeAttribute("src", imgFile);
     tb.MergeAttribute("border", "0");
     var sizeValue = 65;
     switch (size)
     {
         case ImageSize.Medium:
             sizeValue = 130;
             break;
         case ImageSize.Large:
             sizeValue = 195;
             break;
         default:
             break;
     }
     tb.MergeAttribute("width", sizeValue.ToString());
     tb.MergeAttribute("height", sizeValue.ToString());
     if (htmlAttributes != null)
     {
         IDictionary<string, object> additionAttributes = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
         tb.MergeAttributes<string, object>(additionAttributes);
     }
     return MvcHtmlString.Create(tb.ToString(TagRenderMode.SelfClosing));
 }

        /// <summary>
        /// Returns an URL to entry thumbnail image.
        /// Currently only used for album and artist main images.
        /// 
        /// Gets the URL to the static images folder on disk if possible,
        /// otherwise gets the image from the DB.
        /// </summary>
        /// <param name="urlHelper">URL helper. Cannot be null.</param>
        /// <param name="imageInfo">Image information. Cannot be null.</param>
        /// <param name="size">Requested image size.</param>
        /// <param name="fullUrl">
        /// Whether the URL should always include the hostname and application path root.
        /// If this is false (default), the URL maybe either full (such as http://vocadb.net/Album/CoverPicture/123)
        /// or relative (such as /Album/CoverPicture/123).
        /// Usually this should be set to true if the image is to be referred from another domain.
        /// </param>
        /// <returns>URL to the image thumbnail.</returns>
        public static string ImageThumb(this UrlHelper urlHelper, IEntryImageInformation imageInfo, ImageSize size, bool fullUrl = false)
        {
            if (imageInfo == null)
                return null;

            var shouldExist = ShouldExist(imageInfo);
            string dynamicUrl = null;

            // Use MVC dynamic actions when requesting original or an image that doesn't exist on disk.
            if (imageInfo.EntryType == EntryType.Album) {

                if (size == ImageSize.Original)
                    dynamicUrl = urlHelper.Action("CoverPicture", "Album", new { id = imageInfo.Id, v = imageInfo.Version });
                else if (shouldExist && !imagePersister.HasImage(imageInfo, size))
                    dynamicUrl = urlHelper.Action("CoverPictureThumb", "Album", new { id = imageInfo.Id, v = imageInfo.Version });

            } else if (imageInfo.EntryType == EntryType.Artist) {

                if (size == ImageSize.Original)
                    dynamicUrl = urlHelper.Action("Picture", "Artist", new { id = imageInfo.Id, v = imageInfo.Version });
                else if (shouldExist && !imagePersister.HasImage(imageInfo, size))
                    dynamicUrl = urlHelper.Action("PictureThumb", "Artist", new { id = imageInfo.Id, v = imageInfo.Version });

            }

            if (dynamicUrl != null) {
                return (fullUrl ? AppConfig.HostAddress + dynamicUrl : dynamicUrl);
            }

            if (!shouldExist)
                return GetUnknownImageUrl(urlHelper, imageInfo);

            return imagePersister.GetUrlAbsolute(imageInfo, size, WebHelper.IsSSL(HttpContext.Current.Request));
        }

        public ImageLoadResults FromUrl(string url, bool ignoreRestrictions, ImageSize minSize, ImageSize maxSize, bool redownload)
        {
            // if this resource already exists
              if (File.Exists(Filename))
              {
            // if we are redownloading, just delete what we have
            if (redownload)
            {
              try
              {
            File.Delete(Filename);
            File.Delete(ThumbFilename);
              }
              catch (Exception) { }
            }
            // otherwise return an "already loaded" failure
            else
            {
              return ImageLoadResults.FAILED_ALREADY_LOADED;
            }
              }

              // try to grab the image if failed, exit
              if (!Download(url)) return ImageLoadResults.FAILED;

              // verify the image file and resize it as needed
              return VerifyAndResize(minSize, maxSize);
        }

 /// <summary>
 /// Show Dialog
 /// </summary>
 /// <param name="sender">sender control</param>
 /// <param name="resolution">image size</param>
 /// <returns>filepath of photo</returns>
 public static FileInfo ShowDialog(Control sender, ImageSize resolution)
 {
     if (SystemState.CameraPresent && SystemState.CameraEnabled)
     {
         using (CameraCaptureDialog cameraCaptureDialog = new CameraCaptureDialog())
         {
             cameraCaptureDialog.Owner = sender;
             cameraCaptureDialog.Mode = CameraCaptureMode.Still;
             cameraCaptureDialog.StillQuality = CameraCaptureStillQuality.Normal;
             cameraCaptureDialog.Title = "takeIncidentPhoto".Translate();
             if (resolution != null)
             {
                 cameraCaptureDialog.Resolution = resolution.ToSize();
             }
             if (cameraCaptureDialog.ShowDialog() == DialogResult.OK)
             {
                 return new FileInfo(cameraCaptureDialog.FileName);
             }
         }
     }
     else
     {
         using(OpenFileDialog openFileDialog = new OpenFileDialog())
         {
             openFileDialog.Filter = "JPEG (*.jpg,*.jpeg)|*.jpg;*.jpeg";
             if (openFileDialog.ShowDialog() == DialogResult.OK)
             {
                 return new FileInfo(openFileDialog.FileName);
             }
         }
     }
     return null;
 }

		public void Write(IEntryImageInformation picture, ImageSize size, Image image) {

			using (var stream = new MemoryStream()) {
				image.Save(stream, GetImageFormat(picture));
				Write(picture, size, stream);
			}

		}

        public static MvcHtmlString PoweredByCloudCore(this System.Web.Mvc.HtmlHelper helper, ImageSize imageSize)
        {
            var urlHelper = new System.Web.Mvc.UrlHelper(helper.ViewContext.RequestContext);
            
            string imageSourceUrl = urlHelper.Asset(string.Format("poweredby/{0}.png", imageSize), "CUI");

            return new MvcHtmlString(string.Format("<a href=\"http://www.exclr8.co.za/#cloudcore\" target=\"_blank\"><img style=\"border: 0\" src=\"{0}\" /></a>", imageSourceUrl));
        }

 public ImageInfo this[ImageSize index]
 {
     get { return _imageInfo[(int) index]; }
     private set
     {
         _imageInfo[(int) index] = value;
     }
 }

		private void AssertDimensions(IEntryImageInformation imageInfo, ImageSize size, int width, int height) {

			using (var stream = persister.GetReadStream(imageInfo, size))
			using (var img = Image.FromStream(stream)) {
				Assert.AreEqual(width, img.Width, "Image width");
				Assert.AreEqual(height, img.Height, "Image height");
			}

		}

        /// <summary>
        ///     Gets the Uri to the album's image at the given size
        /// </summary>
        /// <param name="albumId">Id representing the album with the desired image</param>
        /// <param name="size">Size of the image desired</param>
        /// <returns>Uri to the album's image at the given size</returns>
        public async Task<Uri> GetAlbumImageUri(string albumId, ImageSize size = ImageSize.Medium)
        {
            ValidateResourceId(albumId);

            var method = string.Format("albums/{0}/images/default", albumId);

            var response = await GetResourceImageUri(method, size);

            return response;
        }

        /// <summary>
        ///     Gets the Uri to the playlist's image at the given size
        /// </summary>
        /// <param name="playlistId">Id representing the playlist with the desired image</param>
        /// <param name="size">Size of the image desired</param>
        /// <returns>Uri to the playlist's image at the given size</returns>
        public async Task<Uri> GetPlaylistImageUri(string playlistId, ImageSize size = ImageSize.Medium)
        {
            ValidateResourceId(playlistId);

            var method = string.Format("playlists/{0}/images/default", playlistId);

            var response = await GetResourceImageUri(method, size);

            return response;
        }

        public byte[] Load(int haystackId, long photoKey, ImageSize size, int cookie)
        {
            var idx = _inMemoryIndex.Get(photoKey);

            var offset = idx[size].Offset;

            var dataSize = idx[size].Size;

            return _haystackService.Read(idx.PhotoKey, (int) size, cookie, offset, dataSize);
        }