C# Http.HttpContent类代码示例

 private static string ReadContentAsync(HttpContent content)
 {
     Task task = content.LoadIntoBufferAsync();
     task.Wait(TimeoutConstant.DefaultTimeout);
     Assert.Equal(TaskStatus.RanToCompletion, task.Status);
     return content.ReadAsStringAsync().Result;
 }

 /// <summary>
 /// Generates a web request to return the user-defined metadata for this container.
 /// </summary>
 /// <param name="uri">The absolute URI to the container.</param>
 /// <param name="timeout">The server timeout interval.</param>
 /// <param name="accessCondition">The access condition to apply to the request.</param>
 /// <returns>A web request to use to perform the operation.</returns>
 public static HttpRequestMessage GetMetadata(Uri uri, int? timeout, AccessCondition accessCondition, HttpContent content, OperationContext operationContext)
 {
     UriQueryBuilder containerBuilder = GetContainerUriQueryBuilder();
     HttpRequestMessage request = HttpRequestMessageFactory.GetMetadata(uri, timeout, containerBuilder, content, operationContext);
     request.ApplyAccessCondition(accessCondition);
     return request;
 }

 public override Task WriteToStreamAsync(Type type, object value, Stream writeStream, HttpContent content, TransportContext transportContext)
 {
     var writer = new StreamWriter(writeStream);
     JSON.Serialize(value, writer, _options);
     writer.Flush();
     return Task.FromResult(writeStream);
 }

        public override Task WriteToStreamAsync(Type type, object value, Stream writeStream, HttpContent content, TransportContext transportContext)
        {
            
            return Task.Factory.StartNew(() =>
            {
                XmlWriter writer = new XmlTextWriter(writeStream, new UTF8Encoding(false));
                bool summary = requestMessage.RequestSummary();

                if (type == typeof(OperationOutcome)) 
                {
                    Resource resource = (Resource)value;
                    FhirSerializer.SerializeResource(resource, writer, summary);
                }
                else if (type.IsAssignableFrom(typeof(Resource)))
                {
                    Resource resource = (Resource)value;
                    FhirSerializer.SerializeResource(resource, writer, summary);
                    
                    content.Headers.ContentLocation = resource.ExtractKey().ToUri();
                }
                else if (type == typeof(FhirResponse))
                {
                    FhirResponse response = (value as FhirResponse);
                    if (response.HasBody)
                    FhirSerializer.SerializeResource(response.Resource, writer, summary);
                }
                
                writer.Flush();
            });
        }

        public static string BuildBase64Signature(
                string apiKey,
                string appId,
                Uri rawUri,
                HttpMethod httpMethod,
                HttpContent content,
                string nonce,
                string requestTimeStamp
            )
        {
            var requestUri = HttpUtility.UrlEncode(rawUri.AbsoluteUri.ToLower());
            var requestHttpMethod = httpMethod.Method;

            // Get the content string out of the content.
            string requestContentBase64String = ComputeBase64RequestContent(content);

            // Rebuild the signature raw data.
            var signatureRawData =
            $"{appId}{requestHttpMethod}{requestUri}{requestTimeStamp}{nonce}{requestContentBase64String}";

            // Get the api key bytes.
            var secretKeyBytes = Convert.FromBase64String(apiKey);

            // Get the signature.
            var signature = Encoding.UTF8.GetBytes(signatureRawData);

            // Create HMAC SHA class with key data.
            using (var hmac = new HMACSHA256(secretKeyBytes))
            {
                return Convert.ToBase64String(hmac.ComputeHash(signature));
            }
        }

        public CompressedContent(HttpContent content, string encodingType)
        {
            if (content == null)
            {
                throw new ArgumentNullException("content");
            }

            if (encodingType == null)
            {
                throw new ArgumentNullException("encodingType");
            }

            originalContent = content;
            this.encodingType = encodingType.ToLowerInvariant();

            if (this.encodingType != "gzip" && this.encodingType != "deflate")
            {
                throw new InvalidOperationException(string.Format("Encoding '{0}' is not supported. Only supports gzip or deflate encoding.", this.encodingType));
            }

            // copy the headers from the original content
            foreach (KeyValuePair<string, IEnumerable<string>> header in originalContent.Headers)
            {
                Headers.TryAddWithoutValidation(header.Key, header.Value);
            }

            Headers.ContentEncoding.Add(encodingType);
        }

        public override Task WriteToStreamAsync(Type type, object value, Stream writeStream, HttpContent content, TransportContext transportContext)
        {
            return Task.Factory.StartNew(() =>
            {
                XmlWriter writer = new XmlTextWriter(writeStream, Encoding.UTF8);
                // todo: klopt het dat Bundle wel en <?xml ...> header heeft een Resource niet?
                // follow up: is now ticket in FhirApi. Check later.

                if (type == typeof(OperationOutcome)) 
                {
                    Resource resource = (Resource)value;
                    FhirSerializer.SerializeResource(resource, writer);
                }
                else if (type == typeof(ResourceEntry))
                {
                    ResourceEntry entry = (ResourceEntry)value;
                    FhirSerializer.SerializeResource(entry.Resource, writer);
                    
                    content.Headers.SetFhirTags(entry.Tags);
                }

                else if (type == typeof(Bundle))
                {
                    FhirSerializer.SerializeBundle((Bundle)value, writer);
                }
                else if (type == typeof(TagList))
                {
                    FhirSerializer.SerializeTagList((TagList)value, writer); 
                }
                
                writer.Flush();
            });
        }

        public async void WriteToStream(Stream outputStream, HttpContent content, TransportContext context)
        {
            try
            {
                var buffer = new byte[65536];

                using (var video = new MemoryStream(this.videoData))
                {
                    var length = (int)video.Length;
                    var bytesRead = 1;

                    while (length > 0 && bytesRead > 0)
                    {
                        bytesRead = video.Read(buffer, 0, Math.Min(length, buffer.Length));
                        await outputStream.WriteAsync(buffer, 0, bytesRead);
                        length -= bytesRead;
                    }
                }
            }
            catch (Exception ex)
            {
                return;
            }
            finally
            {
                outputStream.Close();
            }
        }

        //public JsonFormatter()
        //{
        //  SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/json"));
        //  SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json"));
        //}
        public override Task<object> ReadFromStreamAsync(Type type, Stream readStream, HttpContent content, IFormatterLogger formatterLogger)
        {
            var task = new TaskCompletionSource<object>();

              using (var ms = new MemoryStream())
              {
            readStream.CopyTo(ms);
            //ms.Seek(0, SeekOrigin.Begin);

            //var result = JsonSchemaValidator.Instance().Validate(ms, type);

            //if (!string.IsNullOrWhiteSpace(result))
            //  task.SetResult(result);
            //else
            {
              ms.Seek(0, SeekOrigin.Begin);
              using (var reader = new JsonTextReader(new StreamReader(ms)))
              {
            var serializer = new JsonSerializer();
            task.SetResult(serializer.Deserialize(reader, type));
              }
            }
              }
              return task.Task;
        }

 public void WriteToStream(Type type, object value, Stream stream, HttpContent content)
 {
     Author author = (Author)value;
     Image image = Image.FromFile(@"D:\dev\CodicePlastico\WebApiBook\HelloWebApi\HelloWebApi\Content\Photos\" + author.Name + ".png");
     image.Save(stream, ImageFormat.Png);
     image.Dispose();
 }

 public override Task<object> ReadFromStreamAsync(Type type, Stream readStream, HttpContent content, IFormatterLogger formatterLogger)
 {
     return Task.Factory.StartNew(() =>
     {
         return (object)null;
     });
 }

        public static bool IsFileContent(HttpContent parent, HttpContentHeaders headers)
        {
            if (parent == null)
            {
                throw new ArgumentNullException("parent");
            }

            if (headers == null)
            {
                throw new ArgumentNullException("headers");
            }

            // For form data, Content-Disposition header is a requirement.
            ContentDispositionHeaderValue contentDisposition = headers.ContentDisposition;
            if (contentDisposition == null)
            {
                // If no Content-Disposition header was present.
                throw new InvalidOperationException("No Content-Disposition header found");
            }

            // The file name's existence indicates it is a file data.
            if (!string.IsNullOrEmpty(contentDisposition.FileName))
            {
                return true;
            }

            return false;
        }

        public override async Task<object> ReadFromStreamAsync(Type type, Stream stream,
                                                        HttpContent httpContent,
                                                        IFormatterLogger iFormatterLogger)
        {
            MultipartStreamProvider parts = await httpContent.ReadAsMultipartAsync();
            IEnumerable<HttpContent> contents = parts.Contents;

            HttpContent content = contents.FirstOrDefault();
            foreach (HttpContent c in contents ) {
                if (SupportedMediaTypes.Contains(c.Headers.ContentType)) {
                    content = c;
                    break;
                }
            }

            using (var msgStream = await content.ReadAsStreamAsync())
            {
                DataContractJsonSerializer js = new DataContractJsonSerializer(typeof(TenMsg));
                TenMsg msg = (TenMsg)js.ReadObject(msgStream);
                Debug.WriteLine("msgString: " + msgStream.ToString());

                int sender = msg.Sender;
                int receiver = msg.Receiver;
                byte phoneType = msg.PhoneType;
                bool isLocked = msg.IsLocked;
                DateTime msgTime = msg.MsgTime;
                string msgContent = msg.MsgContent;
                Debug.WriteLine("Msg Content: " + msg.MsgContent);
                
                return new TenMsg(sender, receiver, phoneType, isLocked, msgTime, msgContent);
            }
        }

 public override async Task<object> ReadFromStreamAsync(Type type, Stream readStream, HttpContent content, IFormatterLogger formatterLogger)
 {
     MultipartMemoryStreamProvider multipartMemoryStreamProvider = await content.ReadAsMultipartAsync();
     Collection<HttpContent> contents = multipartMemoryStreamProvider.Contents;
     ImageSet imageSet = await contents.FirstOrDefault<HttpContent>((HttpContent c) => c.Headers.ContentDisposition.Name.NormalizeName() == "imageset").ReadAsAsync<ImageSet>();
     ImageSet images = imageSet;
     Collection<HttpContent> httpContents = multipartMemoryStreamProvider.Contents;
     List<HttpContent> list = (
         from c in httpContents
         where c.Headers.ContentDisposition.Name.NormalizeName().Matches("image\\d+")
         select c).ToList<HttpContent>();
     images.Images = new List<Image>();
     foreach (HttpContent httpContent in list)
     {
         List<Image> images1 = images.Images;
         Image image = new Image();
         Image image1 = image;
         image1.ImageData = await httpContent.ReadAsByteArrayAsync();
         image.MimeType = httpContent.Headers.ContentType.MediaType;
         image.FileName = httpContent.Headers.ContentDisposition.FileName.NormalizeName();
         images1.Add(image);
         images1 = null;
         image1 = null;
         image = null;
     }
     return images;
 }

        HttpAbfrage(String Ziel, HttpContent content)
        {
           
            //################################################################################################

            var httpClient = new HttpClient();      // Neue httpClient instanz

            //##################################################################################################
            // mit Cockies aber nicht zu ende Programmiert weil wir keine Cockies nutzen 

            CookieContainer cookie = new CookieContainer();             // Cockie Container Construcktor
            HttpClientHandler handler = new HttpClientHandler()         // nutze beim zugriff cockies
            {
            };
            HttpClient client = new HttpClient(handler as HttpMessageHandler) // neuer http client
            {
                BaseAddress = new Uri(GlobalData.Uri2 + Ziel + GlobalData.SessionID)     // hier wird auch gleich die Session an das ziel angehangen                                        // url aus uri 2 nutzen test2.php
            };
            handler.UseCookies = false;                                        // beim zugriff cockies nicht zulassen
            handler.UseDefaultCredentials = false;

            //#################################################################################################
            // Jetzt mit POST
            // Schritt 4 Abfrage abschicken und ergebnis entgegennehmen 
            HttpResponseMessage response = await httpClient.PostAsync(client.BaseAddress, content); // schicke die abfrage an die Url , dann warte bis antwort komplett und speicher erst mal alles
            GlobalData.HttpResponse = await response.Content.ReadAsStringAsync();
           // MessageDialog msgboxRespons = new MessageDialog(GlobalData.HttpResponse);
           // await msgboxRespons.ShowAsync();        // Zeige mir an was angekommen ist 
            return GlobalData.HttpResponse;
        }