c# - 如何通过 REST API .net 以二进制形式返回图像(不是 url)

Question

好的，我有一个获取/添加/更新/删除客户的 webapi，后端是 CosmosDB。

用户可以为每个客户上传图像，文件存储在 Azure Blob 存储中，但文件名存储在 CosmosDB 属性中。

[HttpPost]
        public async Task<IHttpActionResult> Adduser([FromBody]User user)
        {
            var telemetry = new TelemetryClient();
            try
            {
                var userStore = CosmosStoreHolder.Instance.CosmosStoreUser;
                if (!ModelState.IsValid)
                {
                    return BadRequest(ModelState);
                }

                //Then we validate the content type
                if (!Request.Content.IsMimeMultipartContent("form-data"))
                {
                    throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
                }

                #region File upload
                //Initalize configuration settings
                var accountName = ConfigurationManager.AppSettings["storage:account:name"];
                var accountKey = ConfigurationManager.AppSettings["storage:account:key"];
                var profilepicturecontainername = ConfigurationManager.AppSettings["storage:account:profilepicscontainername"];

                //Instance objects needed to store the files
                var storageAccount = new CloudStorageAccount(new StorageCredentials(accountName, accountKey), true);
                CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
                CloudBlobContainer imagesContainer = blobClient.GetContainerReference(profilepicturecontainername);
                var provider = new AzureStorageMultipartFormDataStreamProvider(imagesContainer);

                // Validate extension and image size
                foreach (MultipartFileData file in provider.FileData)
                {

                    var fileName = file.Headers.ContentDisposition.FileName.Trim('\"').Trim();
                    if (fileName.EndsWith(".png"))
                    {
                        var img = Image.FromFile(file.LocalFileName);
                        if (img.Width != 200 && img.Height != 200)
                        {
                            string guid = Guid.NewGuid().ToString();

                            return BadRequest($"Error Lulo. Unsupported extension, only PNG is valid. Or unsuported image dimensions (200px x 200px)");
                        }
                    }
                }


                //Try to upload file
                try
                {
                    await Request.Content.ReadAsMultipartAsync(provider);
                }
                catch (Exception ex)
                {
                    string guid = Guid.NewGuid().ToString();
                    var dt = new Dictionary<string, string>
                    {
                        { "Error Lulo: ", guid }
                    };
                    telemetry.TrackException(ex, dt);
                    return BadRequest($"Error Lulo. An error has occured. Details: {guid} {ex.Message}: ");
                }

                // Retrieve the filename of the file you have uploaded
                var filename = provider.FileData.FirstOrDefault()?.LocalFileName;
                if (string.IsNullOrEmpty(filename))
                {
                    string guid = Guid.NewGuid().ToString();
                    var dt = new Dictionary<string, string>
                    {
                        { "Error Lulo: ", guid }
                    };

                    return BadRequest($"Error Lulo. An error has occured while uploading your file. Please try again.: {guid} ");
                }

                //Rename file
                CloudBlockBlob blobCopy = imagesContainer.GetBlockBlobReference(user.Id + ".png");
                if (!await blobCopy.ExistsAsync())
                {
                    CloudBlockBlob blob = imagesContainer.GetBlockBlobReference(filename);

                    if (await blob.ExistsAsync())
                    {
                        await blobCopy.StartCopyAsync(blob);
                        await blob.DeleteIfExistsAsync();
                    }
                }

                #endregion

                if (string.IsNullOrEmpty(user.CustomerId) && string.IsNullOrEmpty(user.PartnerId))
                {
                    return BadRequest("ClientID or PartnerId must be filled in.");
                }

                var added = await userStore.AddAsync(user);
                return Ok(added);
            }
            catch (Exception ex)
            {
                string guid = Guid.NewGuid().ToString();
                var dt = new Dictionary<string, string>
                {
                    { "Error Lulo: ", guid }
                };

                telemetry.TrackException(ex, dt);
                return BadRequest("Error Lulo: " + guid);
            }             
        }

现在，我需要返回到 web api，前端开发人员可以以某种方式呈现图像。 Azure Blob 容器不是公共(public)的，因此返回 Url 是不够的。

前端是react。

这是我的get方法(只返回图片Url)

 [HttpGet]
        public async Task<IHttpActionResult> GetUser(string email)
        {
            var telemetry = new TelemetryClient();
            try
            {
                var userStore = CosmosStoreHolder.Instance.CosmosStoreUser;
                var roleStore = CosmosStoreHolder.Instance.CosmosStoreRole;

                var user = await userStore.Query().FirstOrDefaultAsync(x => x.EmailAddress == email);
                if (user == null)
                {
                    return Unauthorized();
                }
                var role = await roleStore.Query().FirstOrDefaultAsync(x => x.Id == user.RoleId);
                user.RoleName = role.RoleName;

                return Ok(user);
            }
            catch (Exception ex)
            {
                string guid = Guid.NewGuid().ToString();
                var dt = new Dictionary<string, string>
                {
                    { "Error Lulo: ", guid }
                };

                telemetry.TrackException(ex, dt);
                return BadRequest("Error Lulo: " + guid);
            }
        }

为了以防万一，下面的用户 POCO:

public class User : ISharedCosmosEntity
    {
        [JsonProperty("Id")]
        public string Id { get; set; }
        public string EmailAddress { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public bool Enabled { get; set; }

        public string ProfilePictureUrl { get; set; }
        public string RoleName { get; set; }
        public string CustomerName { get; set; }
        public string PartnerName { get; set; }

        public string CustomerId{ get; set; }
        public string PartnerId { get; set; }
        public string RoleId { get; set; }

        [CosmosPartitionKey]
        public string CosmosEntityName { get; set; }
    }

Answer 1

如果您没有图像的固定公共(public) url，则需要将其编码为 base64 并将其作为内联图像嵌入。

如果您可以从 Web API 后端访问 POCO 中的 url，则可以使用以下代码检索和转换图像:

        private static HttpClient _httpClient = new HttpClient();

        public async Task<string> GetInlineImageSrcAsync(string url)
        {
            var bytes = await _httpClient.GetByteArrayAsync(url);
            var base64 = Convert.ToBase64String(bytes);
            var mimeType = "image/png";
            // If mime types differ, try this
            // var mimeType = $"image/{ParseExtensionFromUrl(url)}"
            var inlineImageSrc = $"data:{mimeType};base64,{base64}";
            return inlineImageSrc;
        }

        public string ParseExtensionFromUrl(string url)
        {
            return url.Substring(url.LastIndexOf(".") + 1);
        }

请注意，HttpClient 应该是静态的，以使其能够重用连接。这是 Microsoft 推荐的，可以提高性能。 更多相关信息:

https://medium.com/@nuno.caneco/c-httpclient-should-not-be-disposed-or-should-it-45d2a8f568bc

https://aspnetmonsters.com/2016/08/2016-08-27-httpclientwrong/

编辑: 这是实际嵌入图像的 HTML:

<img src="<THE STRING YOU RETURNED>" />

<!-- For Example: -->
<img src="data:image/jpeg;base64,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