C# Net.WebConnectionStream类代码示例

		static void ReadDone (IAsyncResult result)
		{
			WebConnection cnc = (WebConnection) result.AsyncState;
			WebConnectionData data = cnc.Data;
			Stream ns = cnc.nstream;
			if (ns == null) {
				cnc.Close (true);
				return;
			}

			int nread = -1;
			try {
				nread = ns.EndRead (result);
			} catch (ObjectDisposedException) {
				return;
			} catch (Exception e) {
				if (e.InnerException is ObjectDisposedException)
					return;

				cnc.HandleError (WebExceptionStatus.ReceiveFailure, e, "ReadDone1");
				return;
			}

			if (nread == 0) {
				cnc.HandleError (WebExceptionStatus.ReceiveFailure, null, "ReadDone2");
				return;
			}

			if (nread < 0) {
				cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, null, "ReadDone3");
				return;
			}

			int pos = -1;
			nread += cnc.position;
			if (cnc.readState == ReadState.None) { 
				Exception exc = null;
				try {
					pos = cnc.GetResponse (cnc.buffer, nread);
				} catch (Exception e) {
					exc = e;
				}

				if (exc != null || pos == -1) {
					cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, exc, "ReadDone4");
					return;
				}
			}

			if (cnc.readState != ReadState.Content) {
				int est = nread * 2;
				int max = (est < cnc.buffer.Length) ? cnc.buffer.Length : est;
				byte [] newBuffer = new byte [max];
				Buffer.BlockCopy (cnc.buffer, 0, newBuffer, 0, nread);
				cnc.buffer = newBuffer;
				cnc.position = nread;
				cnc.readState = ReadState.None;
				InitRead (cnc);
				return;
			}

			cnc.position = 0;

			WebConnectionStream stream = new WebConnectionStream (cnc);
			bool expect_content = ExpectContent (data.StatusCode, data.request.Method);
			string tencoding = null;
			if (expect_content)
				tencoding = data.Headers ["Transfer-Encoding"];

			cnc.chunkedRead = (tencoding != null && tencoding.IndexOf ("chunked", StringComparison.OrdinalIgnoreCase) != -1);
			if (!cnc.chunkedRead) {
				stream.ReadBuffer = cnc.buffer;
				stream.ReadBufferOffset = pos;
				stream.ReadBufferSize = nread;
				try {
					stream.CheckResponseInBuffer ();
				} catch (Exception e) {
					cnc.HandleError (WebExceptionStatus.ReceiveFailure, e, "ReadDone7");
				}
			} else if (cnc.chunkStream == null) {
				try {
					cnc.chunkStream = new ChunkStream (cnc.buffer, pos, nread, data.Headers);
				} catch (Exception e) {
					cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, e, "ReadDone5");
					return;
				}
			} else {
				cnc.chunkStream.ResetBuffer ();
				try {
					cnc.chunkStream.Write (cnc.buffer, pos, nread);
				} catch (Exception e) {
					cnc.HandleError (WebExceptionStatus.ServerProtocolViolation, e, "ReadDone6");
					return;
				}
			}

			data.stream = stream;
			
			if (!expect_content)
				stream.ForceCompletion ();
//.........这里部分代码省略.........

		internal void SetWriteStream (WebConnectionStream stream)
		{
			if (Aborted)
				return;
			
			writeStream = stream;
			if (bodyBuffer != null) {
				webHeaders.RemoveInternal ("Transfer-Encoding");
				contentLength = bodyBufferLength;
				writeStream.SendChunked = false;
			}

			SendRequestHeaders (false);

			haveRequest = true;
			
			if (bodyBuffer != null) {
				// The body has been written and buffered. The request "user"
				// won't write it again, so we must do it.
				if (ntlm_auth_state != NtlmAuthState.Challenge) {
					writeStream.Write (bodyBuffer, 0, bodyBufferLength);
					bodyBuffer = null;
					writeStream.Close ();
				}
			} else if (method != "HEAD" && method != "GET" && method != "MKCOL" && method != "CONNECT" &&
					method != "TRACE") {
				if (getResponseCalled && !writeStream.RequestWritten)
					writeStream.WriteRequest ();
			}

			if (asyncWrite != null) {
				asyncWrite.SetCompleted (false, stream);
				asyncWrite.DoCallback ();
				asyncWrite = null;
			}
		}

		internal void SetWriteStream (WebConnectionStream stream)
		{
			if (Aborted)
				return;
			
			writeStream = stream;
			if (bodyBuffer != null) {
				webHeaders.RemoveInternal ("Transfer-Encoding");
				contentLength = bodyBufferLength;
				writeStream.SendChunked = false;
			}

			try {
				var result = writeStream.SetHeadersAsync (false, SetWriteStreamCB, null);
				if (result == null)
					SetWriteStreamCB (null);
			} catch (Exception exc) {
				SetWriteStreamErrorCB (exc);
			}
		}

		internal void SetWriteStream (WebConnectionStream stream)
		{
			if (Aborted)
				return;
			
			writeStream = stream;
			if (bodyBuffer != null) {
				webHeaders.RemoveInternal ("Transfer-Encoding");
				contentLength = bodyBufferLength;
				writeStream.SendChunked = false;
			}

			writeStream.SetHeadersAsync (false, result => {
				if (result.GotException) {
					SetWriteStreamError (result.Exception);
					return;
				}

				haveRequest = true;

				SetWriteStreamInner (inner => {
					if (inner.GotException) {
						SetWriteStreamError (inner.Exception);
						return;
					}

					if (asyncWrite != null) {
						asyncWrite.SetCompleted (inner.CompletedSynchronously, writeStream);
						asyncWrite.DoCallback ();
						asyncWrite = null;
					}
				});
			});
		}

		internal void SetWriteStream (WebConnectionStream stream)
		{
			if (Aborted)
				return;
			
			writeStream = stream;
			if (bodyBuffer != null) {
				webHeaders.RemoveInternal ("Transfer-Encoding");
				contentLength = bodyBufferLength;
				writeStream.SendChunked = false;
			}

			byte[] requestHeaders = GetRequestHeaders ();
			WebAsyncResult result = new WebAsyncResult (new AsyncCallback (SetWriteStreamCB), null);
			writeStream.SetHeadersAsync (requestHeaders, result);
		}

		public override void Abort ()
		{
			if (Interlocked.CompareExchange (ref aborted, 1, 0) == 1)
				return;

			if (haveResponse && finished_reading)
				return;

			haveResponse = true;
			if (abortHandler != null) {
				try {
					abortHandler (this, EventArgs.Empty);
				} catch (Exception) {}
				abortHandler = null;
			}

			if (asyncWrite != null) {
				WebAsyncResult r = asyncWrite;
				if (!r.IsCompleted) {
					try {
						WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled); 
						r.SetCompleted (false, wexc);
						r.DoCallback ();
					} catch {}
				}
				asyncWrite = null;
			}			

			if (asyncRead != null) {
				WebAsyncResult r = asyncRead;
				if (!r.IsCompleted) {
					try {
						WebException wexc = new WebException ("Aborted.", WebExceptionStatus.RequestCanceled); 
						r.SetCompleted (false, wexc);
						r.DoCallback ();
					} catch {}
				}
				asyncRead = null;
			}			

			if (writeStream != null) {
				try {
					writeStream.Close ();
					writeStream = null;
				} catch {}
			}

			if (webResponse != null) {
				try {
					webResponse.Close ();
					webResponse = null;
				} catch {}
			}
		}		

		// Returns true if redirected
		bool CheckFinalStatus (WebAsyncResult result)
		{
			if (result.GotException) {
				bodyBuffer = null;
				throw result.Exception;
			}

			Exception throwMe = result.Exception;

			HttpWebResponse resp = result.Response;
			WebExceptionStatus protoError = WebExceptionStatus.ProtocolError;
			HttpStatusCode code = 0;
			if (throwMe == null && webResponse != null) {
				code = webResponse.StatusCode;
				if (!authCompleted && ((code == HttpStatusCode.Unauthorized && credentials != null) ||
				     (ProxyQuery && code == HttpStatusCode.ProxyAuthenticationRequired))) {
					if (!usedPreAuth && CheckAuthorization (webResponse, code)) {
						// Keep the written body, so it can be rewritten in the retry
						if (InternalAllowBuffering) {
							// NTLM: This is to avoid sending data in the 'challenge' request
							// We save it in the first request (first 401), don't send anything
							// in the challenge request and send it in the response request along
							// with the buffers kept form the first request.
							if (ntlm_auth_state != NtlmAuthState.Response) {
								bodyBuffer = writeStream.WriteBuffer;
								bodyBufferLength = writeStream.WriteBufferLength;
							}
							return true;
						} else if (method != "PUT" && method != "POST") {
							bodyBuffer = null;
							return true;
						}

						if (!ThrowOnError)
							return false;
							
						writeStream.InternalClose ();
						writeStream = null;
						webResponse.Close ();
						webResponse = null;
						bodyBuffer = null;
							
						throw new WebException ("This request requires buffering " +
									"of data for authentication or " +
									"redirection to be sucessful.");
					}
				}

				bodyBuffer = null;
				if ((int) code >= 400) {
					string err = String.Format ("The remote server returned an error: ({0}) {1}.",
								    (int) code, webResponse.StatusDescription);
					throwMe = new WebException (err, null, protoError, webResponse);
					webResponse.ReadAll ();
				} else if ((int) code == 304 && allowAutoRedirect) {
					string err = String.Format ("The remote server returned an error: ({0}) {1}.",
								    (int) code, webResponse.StatusDescription);
					throwMe = new WebException (err, null, protoError, webResponse);
				} else if ((int) code >= 300 && allowAutoRedirect && redirects >= maxAutoRedirect) {
					throwMe = new WebException ("Max. redirections exceeded.", null,
								    protoError, webResponse);
					webResponse.ReadAll ();
				}
			}

			bodyBuffer = null;
			if (throwMe == null) {
				bool b = false;
				int c = (int) code;
				if (allowAutoRedirect && c >= 300) {
					if (InternalAllowBuffering && writeStream.WriteBufferLength > 0) {
						bodyBuffer = writeStream.WriteBuffer;
						bodyBufferLength = writeStream.WriteBufferLength;
					}
					b = Redirect (result, code);
					if (b && ntlm_auth_state != 0)
						ntlm_auth_state = 0;
				}

				if (resp != null && c >= 300 && c != 304)
					resp.ReadAll ();

				return b;
			}
				
			if (!ThrowOnError)
				return false;

			if (writeStream != null) {
				writeStream.InternalClose ();
				writeStream = null;
			}

			webResponse = null;

			throw throwMe;
		}

		// Returns true if redirected
		bool CheckFinalStatus (WebAsyncResult result)
		{
			if (result.GotException)
				throw result.Exception;

			Exception throwMe = result.Exception;
			bodyBuffer = null;

			HttpWebResponse resp = result.Response;
			WebExceptionStatus protoError = WebExceptionStatus.ProtocolError;
			HttpStatusCode code = 0;
			if (throwMe == null && webResponse != null) {
				code = webResponse.StatusCode;
				if (!authCompleted && ((code == HttpStatusCode.Unauthorized && credentials != null) ||
				     (ProxyQuery && code == HttpStatusCode.ProxyAuthenticationRequired))) {
					if (!usedPreAuth && CheckAuthorization (webResponse, code)) {
						// Keep the written body, so it can be rewritten in the retry
						if (InternalAllowBuffering) {
							bodyBuffer = writeStream.WriteBuffer;
							bodyBufferLength = writeStream.WriteBufferLength;
							return true;
						} else if (method != "PUT" && method != "POST") {
							return true;
						}
						
						writeStream.InternalClose ();
						writeStream = null;
						webResponse.Close ();
						webResponse = null;

						throw new WebException ("This request requires buffering " +
									"of data for authentication or " +
									"redirection to be sucessful.");
					}
				}

				if ((int) code >= 400) {
					string err = String.Format ("The remote server returned an error: ({0}) {1}.",
								    (int) code, webResponse.StatusDescription);
					throwMe = new WebException (err, null, protoError, webResponse);
					webResponse.ReadAll ();
				} else if ((int) code == 304 && allowAutoRedirect) {
					string err = String.Format ("The remote server returned an error: ({0}) {1}.",
								    (int) code, webResponse.StatusDescription);
					throwMe = new WebException (err, null, protoError, webResponse);
				} else if ((int) code >= 300 && allowAutoRedirect && redirects >= maxAutoRedirect) {
					throwMe = new WebException ("Max. redirections exceeded.", null,
								    protoError, webResponse);
					webResponse.ReadAll ();
				}
			}

			if (throwMe == null) {
				bool b = false;
				int c = (int) code;
				if (allowAutoRedirect && c >= 300) {
					if (InternalAllowBuffering && writeStream.WriteBufferLength > 0) {
						bodyBuffer = writeStream.WriteBuffer;
						bodyBufferLength = writeStream.WriteBufferLength;
					}
					b = Redirect (result, code);
				}

				if (resp != null && c >= 300 && c != 304)
					resp.ReadAll ();

				return b;
			}

			if (writeStream != null) {
				writeStream.InternalClose ();
				writeStream = null;
			}

			webResponse = null;

			throw throwMe;
		}

		// Returns true if redirected
		bool CheckFinalStatus (WebAsyncResult result)
		{
			if (result.GotException) {
				bodyBuffer = null;
				throw result.Exception;
			}

			Exception throwMe = result.Exception;

			HttpWebResponse resp = result.Response;
			WebExceptionStatus protoError = WebExceptionStatus.ProtocolError;
			HttpStatusCode code = 0;
			if (throwMe == null && webResponse != null) {
				code = webResponse.StatusCode;
				if ((!auth_state.IsCompleted && code == HttpStatusCode.Unauthorized && credentials != null) ||
					(ProxyQuery && !proxy_auth_state.IsCompleted && code == HttpStatusCode.ProxyAuthenticationRequired)) {
					if (!usedPreAuth && CheckAuthorization (webResponse, code)) {
						// Keep the written body, so it can be rewritten in the retry
						if (MethodWithBuffer) {
							if (AllowWriteStreamBuffering) {
								if (writeStream.WriteBufferLength > 0) {
									bodyBuffer = writeStream.WriteBuffer;
									bodyBufferLength = writeStream.WriteBufferLength;
								}

								return true;
							}

							//
							// Buffering is not allowed but we have alternative way to get same content (we
							// need to resent it due to NTLM Authentication).
					 		//
							if (ResendContentFactory != null) {
								using (var ms = new MemoryStream ()) {
									ResendContentFactory (ms);
									bodyBuffer = ms.ToArray ();
									bodyBufferLength = bodyBuffer.Length;
								}
								return true;
							}
						} else if (method != "PUT" && method != "POST") {
							bodyBuffer = null;
							return true;
						}

						if (!ThrowOnError)
							return false;
							
						writeStream.InternalClose ();
						writeStream = null;
						webResponse.Close ();
						webResponse = null;
						bodyBuffer = null;
							
						throw new WebException ("This request requires buffering " +
									"of data for authentication or " +
									"redirection to be sucessful.");
					}
				}

				bodyBuffer = null;
				if ((int) code >= 400) {
					string err = String.Format ("The remote server returned an error: ({0}) {1}.",
								    (int) code, webResponse.StatusDescription);
					throwMe = new WebException (err, null, protoError, webResponse);
					webResponse.ReadAll ();
				} else if ((int) code == 304 && allowAutoRedirect) {
					string err = String.Format ("The remote server returned an error: ({0}) {1}.",
								    (int) code, webResponse.StatusDescription);
					throwMe = new WebException (err, null, protoError, webResponse);
				} else if ((int) code >= 300 && allowAutoRedirect && redirects >= maxAutoRedirect) {
					throwMe = new WebException ("Max. redirections exceeded.", null,
								    protoError, webResponse);
					webResponse.ReadAll ();
				}
			}

			bodyBuffer = null;
			if (throwMe == null) {
				bool b = false;
				int c = (int) code;
				if (allowAutoRedirect && c >= 300) {
					b = Redirect (result, code, webResponse);
					if (InternalAllowBuffering && writeStream.WriteBufferLength > 0) {
						bodyBuffer = writeStream.WriteBuffer;
						bodyBufferLength = writeStream.WriteBufferLength;
					}
					if (b && !unsafe_auth_blah) {
						auth_state.Reset ();
						proxy_auth_state.Reset ();
					}
				}

				if (resp != null && c >= 300 && c != 304)
					resp.ReadAll ();

				return b;
			}
				
//.........这里部分代码省略.........