在ASP.NET中，用于處理的請求，需要封裝為HttpWorkerRequest類型的對象。該類為抽象類，定義在命名空間System.Web下。

#region Assembly System.Web.dll, v4.0.0.0 // C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.Web.dll #endregionusing System; using System.Runtime.InteropServices; using System.Security.Principal; using System.Text; using System.Web.Management;namespace System.Web {// Summary:// This abstract class defines the base worker methods and enumerations used// by ASP.NET managed code to process requests.[ComVisible(false)]public abstract class HttpWorkerRequest{// Summary:// Specifies the index number for the Accept HTTP header.public const int HeaderAccept = 20;//// Summary:// Specifies the index number for the Accept-Charset HTTP header.public const int HeaderAcceptCharset = 21;//// Summary:// Specifies the index number for the Accept-Encoding HTTP header.public const int HeaderAcceptEncoding = 22;//// Summary:// Specifies the index number for the Accept-Language HTTP header.public const int HeaderAcceptLanguage = 23;//// Summary:// Specifies the index number for the Accept-Ranges HTTP header.public const int HeaderAcceptRanges = 20;//// Summary:// Specifies the index number for the Age HTTP header.public const int HeaderAge = 21;//// Summary:// Specifies the index number for the Allow HTTP header.public const int HeaderAllow = 10;//// Summary:// Specifies the index number for the Authorization HTTP header.public const int HeaderAuthorization = 24;//// Summary:// The index that represents the HTTP Cache-Control HTTP header.public const int HeaderCacheControl = 0;//// Summary:// Specifies the index number for the Connection HTTP header.public const int HeaderConnection = 1;//// Summary:// Specifies the index number for the Content-Encoding HTTP header.public const int HeaderContentEncoding = 13;//// Summary:// Specifies the index number for the Content-Language HTTP header.public const int HeaderContentLanguage = 14;//// Summary:// Specifies the index number for the Content-Length HTTP header.public const int HeaderContentLength = 11;//// Summary:// Specifies the index number for the Content-Location HTTP header.public const int HeaderContentLocation = 15;//// Summary:// Specifies the index number for the Content-MD5 HTTP header.public const int HeaderContentMd5 = 16;//// Summary:// Specifies the index number for the Content-Range HTTP header.public const int HeaderContentRange = 17;//// Summary:// Specifies the index number for the Content-Type HTTP header.public const int HeaderContentType = 12;//// Summary:// Specifies the index number for the Cookie HTTP header.public const int HeaderCookie = 25;//// Summary:// Specifies the index number for the Date HTTP header.public const int HeaderDate = 2;//// Summary:// Specifies the index number for the ETag HTTP header.public const int HeaderEtag = 22;//// Summary:// Specifies the index number for the Except HTTP header.public const int HeaderExpect = 26;//// Summary:// Specifies the index number for the Expires HTTP header.public const int HeaderExpires = 18;//// Summary:// Specifies the index number for the From HTTP header.public const int HeaderFrom = 27;//// Summary:// Specifies the index number for the Host HTTP header.public const int HeaderHost = 28;//// Summary:// Specifies the index number for the If-Match HTTP header.public const int HeaderIfMatch = 29;//// Summary:// Specifies the index number for the If-Modified-Since HTTP header.public const int HeaderIfModifiedSince = 30;//// Summary:// Specifies the index number for the If-None-Match HTTP header.public const int HeaderIfNoneMatch = 31;//// Summary:// Specifies the index number for the If-Range HTTP header.public const int HeaderIfRange = 32;//// Summary:// Specifies the index number for the If-Unmodified-Since HTTP header.public const int HeaderIfUnmodifiedSince = 33;//// Summary:// Specifies the index number for the Keep-Alive HTTP header.public const int HeaderKeepAlive = 3;//// Summary:// Specifies the index number for the Last-Modified HTTP header.public const int HeaderLastModified = 19;//// Summary:// Specifies the index number for the Location HTTP header.public const int HeaderLocation = 23;//// Summary:// Specifies the index number for the Max-Forwards HTTP header.public const int HeaderMaxForwards = 34;//// Summary:// Specifies the index number for the Pragma HTTP header.public const int HeaderPragma = 4;//// Summary:// Specifies the index number for the Proxy-Authenticate HTTP header.public const int HeaderProxyAuthenticate = 24;//// Summary:// Specifies the index number for the Proxy-Authorization HTTP header.public const int HeaderProxyAuthorization = 35;//// Summary:// Specifies the index number for the Range HTTP header.public const int HeaderRange = 37;//// Summary:// Specifies the index number for the Referer HTTP header.public const int HeaderReferer = 36;//// Summary:// Specifies the index number for the Retry-After HTTP header.public const int HeaderRetryAfter = 25;//// Summary:// Specifies the index number for the Server HTTP header.public const int HeaderServer = 26;//// Summary:// Specifies the index number for the Set-Cookie HTTP header.public const int HeaderSetCookie = 27;//// Summary:// Specifies the index number for the TE HTTP header.public const int HeaderTe = 38;//// Summary:// Specifies the index number for the Trailer HTTP header.public const int HeaderTrailer = 5;//// Summary:// Specifies the index number for the Transfer-Encoding HTTP header.public const int HeaderTransferEncoding = 6;//// Summary:// Specifies the index number for the Upgrade HTTP header.public const int HeaderUpgrade = 7;//// Summary:// Specifies the index number for the User-Agent HTTP header.public const int HeaderUserAgent = 39;//// Summary:// Specifies the index number for the Vary HTTP header.public const int HeaderVary = 28;//// Summary:// Specifies the index number for the Via HTTP header.public const int HeaderVia = 8;//// Summary:// Specifies the index number for the Warning HTTP header.public const int HeaderWarning = 9;//// Summary:// Specifies the index number for the WWW-Authenticate HTTP header.public const int HeaderWwwAuthenticate = 29;//// Summary:// Specifies a reason for the request.public const int ReasonCachePolicy = 2;//// Summary:// Specifies a reason for the request.public const int ReasonCacheSecurity = 3;//// Summary:// Specifies a reason for the request.public const int ReasonClientDisconnect = 4;//// Summary:// Specifies a reason for the request. The default value is System.Web.HttpWorkerRequest.ReasonResponseCacheMiss.public const int ReasonDefault = 0;//// Summary:// Specifies a reason for the request.public const int ReasonFileHandleCacheMiss = 1;//// Summary:// Specifies a reason for the request.public const int ReasonResponseCacheMiss = 0;//// Summary:// Specifies the index number for the Maximum HTTP request header.public const int RequestHeaderMaximum = 40;//// Summary:// Specifies the index number for the Maximum HTTP response header.public const int ResponseHeaderMaximum = 30;// Summary:// Initializes a new instance of the System.Web.HttpWorkerRequest class.protected HttpWorkerRequest();// Summary:// Gets the full physical path to the Machine.config file.//// Returns:// The physical path to the Machine.config file.public virtual string MachineConfigPath { get; }//// Summary:// Gets the physical path to the directory where the ASP.NET binaries are installed.//// Returns:// The physical directory to the ASP.NET binary files.public virtual string MachineInstallDirectory { get; }//// Summary:// Gets the corresponding Event Tracking for Windows trace ID for the current// request.//// Returns:// A trace ID for the current ASP.NET request.public virtual Guid RequestTraceIdentifier { get; }//// Summary:// Gets the full physical path to the root Web.config file.//// Returns:// The physical path to the root Web.config file.public virtual string RootWebConfigPath { get; }//// Summary:// Gets a value that indicates whether asynchronous flush operations are supported.//// Returns:// true if asynchronous flush operations are supported; otherwise, false.public virtual bool SupportsAsyncFlush { get; }//// Summary:// Gets a value that indicates whether asynchronous read operations are supported.//// Returns:// true if asynchronous read operations are supported; otherwise, false.public virtual bool SupportsAsyncRead { get; }// Summary:// Sends the currently buffered response to the client.//// Parameters:// callback:// The method to call when a corresponding asynchronous operation completes.//// state:// A user-provided object that distinguishes this particular asynchronous flush// operation from other requests.//// Returns:// The worker request buffers the status, headers, and response body until an// asynchronous flush operation is initiated. If the underlying System.Web.HttpWorkerRequest// object supports asynchronous flush and this method is called from an asynchronous// module event or asynchronous handler, the send operation is performed asynchronously.// Otherwise, the implementation performs a synchronous flush operation.public virtual IAsyncResult BeginFlush(AsyncCallback callback, object state);//// Summary:// Begins an asynchronous read operation of the request entity body.//// Parameters:// buffer:// The buffer to read the data into.//// offset:// The byte offset in the buffer at which to begin writing data.//// count:// The maximum number of bytes to read.//// callback:// The method to call when a corresponding asynchronous operation completes.//// state:// A user-provided object that distinguishes this particular asynchronous read// from other requests.public virtual IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback callback, object state);//// Summary:// Terminates the connection with the client.public virtual void CloseConnection();//// Summary:// Waits for the pending asynchronous flush operation to complete.//// Parameters:// asyncResult:// A reference to the pending asynchronous request.public virtual void EndFlush(IAsyncResult asyncResult);//// Summary:// Used by the runtime to notify the System.Web.HttpWorkerRequest that request// processing for the current request is complete.public abstract void EndOfRequest();//// Summary:// Waits for the pending asynchronous read operation to complete.//// Parameters:// asyncResult:// A reference to the pending asynchronous request.//// Returns:// The number of bytes that have been read from the stream.public virtual int EndRead(IAsyncResult asyncResult);//// Summary:// Sends all pending response data to the client.//// Parameters:// finalFlush:// true if this is the last time response data will be flushed; otherwise, false.public abstract void FlushResponse(bool finalFlush);//// Summary:// Returns the virtual path to the currently executing server application.//// Returns:// The virtual path of the current application.public virtual string GetAppPath();//// Summary:// Returns the physical path to the currently executing server application.//// Returns:// The physical path of the current application.public virtual string GetAppPathTranslated();//// Summary:// When overridden in a derived class, returns the application pool ID for the// current URL.//// Returns:// Always returns null.public virtual string GetAppPoolID();//// Summary:// Gets the number of bytes read in from the client.//// Returns:// A Long containing the number of bytes read.public virtual long GetBytesRead();//// Summary:// When overridden in a derived class, gets the certification fields (specified// in the X.509 standard) from a request issued by the client.//// Returns:// A byte array containing the stream of the entire certificate content.public virtual byte[] GetClientCertificate();//// Summary:// Gets the certificate issuer, in binary format.//// Returns:// A byte array containing the certificate issuer expressed in binary format.public virtual byte[] GetClientCertificateBinaryIssuer();//// Summary:// When overridden in a derived class, returns the System.Text.Encoding object// in which the client certificate was encoded.//// Returns:// The certificate encoding, expressed as an integer.public virtual int GetClientCertificateEncoding();//// Summary:// When overridden in a derived class, gets a PublicKey object associated with// the client certificate.//// Returns:// A PublicKey object.public virtual byte[] GetClientCertificatePublicKey();//// Summary:// When overridden in a derived class, gets the date when the certificate becomes// valid. The date varies with international settings.//// Returns:// A System.DateTime object representing when the certificate becomes valid.public virtual DateTime GetClientCertificateValidFrom();//// Summary:// Gets the certificate expiration date.//// Returns:// A System.DateTime object representing the date that the certificate expires.public virtual DateTime GetClientCertificateValidUntil();//// Summary:// When overridden in a derived class, returns the ID of the current connection.//// Returns:// Always returns 0.public virtual long GetConnectionID();//// Summary:// When overridden in a derived class, returns the virtual path to the requested// URI.//// Returns:// The path to the requested URI.public virtual string GetFilePath();//// Summary:// Returns the physical file path to the requested URI (and translates it from// virtual path to physical path: for example, "/proj1/page.aspx" to "c:\dir\page.aspx")//// Returns:// The translated physical file path to the requested URI.public virtual string GetFilePathTranslated();//// Summary:// Returns the specified member of the request header.//// Returns:// The HTTP verb returned in the request header.public abstract string GetHttpVerbName();//// Summary:// Provides access to the HTTP version of the request (for example, "HTTP/1.1").//// Returns:// The HTTP version returned in the request header.public abstract string GetHttpVersion();//// Summary:// Returns the standard HTTP request header that corresponds to the specified// index.//// Parameters:// index:// The index of the header. For example, the System.Web.HttpWorkerRequest.HeaderAllow// field.//// Returns:// The HTTP request header.public virtual string GetKnownRequestHeader(int index);//// Summary:// Returns the index number of the specified HTTP request header.//// Parameters:// header:// The name of the header.//// Returns:// The index number of the HTTP request header specified in the header parameter.public static int GetKnownRequestHeaderIndex(string header);//// Summary:// Returns the name of the specified HTTP request header.//// Parameters:// index:// The index number of the header.//// Returns:// The name of the HTTP request header specified in the index parameter.public static string GetKnownRequestHeaderName(int index);//// Summary:// Returns the index number of the specified HTTP response header.//// Parameters:// header:// The name of the HTTP header.//// Returns:// The index number of the HTTP response header specified in the header parameter.public static int GetKnownResponseHeaderIndex(string header);//// Summary:// Returns the name of the specified HTTP response header.//// Parameters:// index:// The index number of the header.//// Returns:// The name of the HTTP response header specified in the index parameter.public static string GetKnownResponseHeaderName(int index);//// Summary:// Provides access to the specified member of the request header.//// Returns:// The server IP address returned in the request header.public abstract string GetLocalAddress();//// Summary:// Provides access to the specified member of the request header.//// Returns:// The server port number returned in the request header.public abstract int GetLocalPort();//// Summary:// Returns additional path information for a resource with a URL extension.// That is, for the path /virdir/page.html/tail, the GetPathInfo value is /tail.//// Returns:// Additional path information for a resource.public virtual string GetPathInfo();//// Summary:// Returns the portion of the HTTP request body that has already been read.//// Returns:// The portion of the HTTP request body that has been read.public virtual byte[] GetPreloadedEntityBody();//// Summary:// Gets the portion of the HTTP request body that has currently been read by// using the specified buffer data and byte offset.//// Parameters:// buffer:// The data to read.//// offset:// The byte offset at which to begin reading.//// Returns:// The portion of the HTTP request body that has been read.public virtual int GetPreloadedEntityBody(byte[] buffer, int offset);//// Summary:// Gets the length of the portion of the HTTP request body that has currently// been read.//// Returns:// An integer containing the length of the currently read HTTP request body.public virtual int GetPreloadedEntityBodyLength();//// Summary:// When overridden in a derived class, returns the HTTP protocol (HTTP or HTTPS).//// Returns:// HTTPS if the System.Web.HttpWorkerRequest.IsSecure() method is true, otherwise// HTTP.public virtual string GetProtocol();//// Summary:// Returns the query string specified in the request URL.//// Returns:// The request query string.public abstract string GetQueryString();//// Summary:// When overridden in a derived class, returns the response query string as// an array of bytes.//// Returns:// An array of bytes containing the response.public virtual byte[] GetQueryStringRawBytes();//// Summary:// Returns the URL path contained in the request header with the query string// appended.//// Returns:// The raw URL path of the request header.public abstract string GetRawUrl();//// Summary:// Provides access to the specified member of the request header.//// Returns:// The client's IP address.public abstract string GetRemoteAddress();//// Summary:// When overridden in a derived class, returns the name of the client computer.//// Returns:// The name of the client computer.public virtual string GetRemoteName();//// Summary:// Provides access to the specified member of the request header.//// Returns:// The client's HTTP port number.public abstract int GetRemotePort();//// Summary:// When overridden in a derived class, returns the reason for the request.//// Returns:// Reason code. The default is ReasonResponseCacheMiss.public virtual int GetRequestReason();//// Summary:// When overridden in a derived class, returns the name of the local server.//// Returns:// The name of the local server.public virtual string GetServerName();//// Summary:// Returns a single server variable from a dictionary of server variables associated// with the request.//// Parameters:// name:// The name of the requested server variable.//// Returns:// The requested server variable.public virtual string GetServerVariable(string name);//// Summary:// Returns a string that describes the name of the specified HTTP status code.//// Parameters:// code:// The HTTP status code.//// Returns:// The status description. For example, System.Web.HttpWorkerRequest.GetStatusDescription(System.Int32)// (404) returns "Not Found".public static string GetStatusDescription(int code);//// Summary:// Gets the length of the entire HTTP request body.//// Returns:// An integer containing the length of the entire HTTP request body.public virtual int GetTotalEntityBodyLength();//// Summary:// Returns a nonstandard HTTP request header value.//// Parameters:// name:// The header name.//// Returns:// The header value.public virtual string GetUnknownRequestHeader(string name);//// Summary:// Get all nonstandard HTTP header name-value pairs.//// Returns:// An array of header name-value pairs.[CLSCompliant(false)]public virtual string[][] GetUnknownRequestHeaders();//// Summary:// Returns the virtual path to the requested URI.//// Returns:// The path to the requested URI.public abstract string GetUriPath();//// Summary:// When overridden in a derived class, returns the context ID of the current// connection.//// Returns:// Always returns 0.public virtual long GetUrlContextID();//// Summary:// When overridden in a derived class, returns the client's impersonation token.//// Returns:// A value representing the client's impersonation token. The default is 0.public virtual IntPtr GetUserToken();//// Summary:// Gets the impersonation token for the request virtual path.//// Returns:// An unmanaged memory pointer for the token for the request virtual path.public virtual IntPtr GetVirtualPathToken();//// Summary:// Returns a value indicating whether the request contains body data.//// Returns:// true if the request contains body data; otherwise, false.public bool HasEntityBody();//// Summary:// Returns a value indicating whether HTTP response headers have been sent to// the client for the current request.//// Returns:// true if HTTP response headers have been sent to the client; otherwise, false.public virtual bool HeadersSent();//// Summary:// Returns a value indicating whether the client connection is still active.//// Returns:// true if the client connection is still active; otherwise, false.public virtual bool IsClientConnected();//// Summary:// Returns a value indicating whether all request data is available and no further// reads from the client are required.//// Returns:// true if all request data is available; otherwise, false.public virtual bool IsEntireEntityBodyIsPreloaded();//// Summary:// Returns a value indicating whether the connection uses SSL.//// Returns:// true if the connection is an SSL connection; otherwise, false. The default// is false.public virtual bool IsSecure();//// Summary:// Returns the physical path corresponding to the specified virtual path.//// Parameters:// virtualPath:// The virtual path.//// Returns:// The physical path that corresponds to the virtual path specified in the virtualPath// parameter.public virtual string MapPath(string virtualPath);//// Summary:// Reads request data from the client (when not preloaded).//// Parameters:// buffer:// The byte array to read data into.//// size:// The maximum number of bytes to read.//// Returns:// The number of bytes read.public virtual int ReadEntityBody(byte[] buffer, int size);//// Summary:// Reads request data from the client (when not preloaded) by using the specified// buffer to read from, byte offset, and maximum bytes.//// Parameters:// buffer:// The byte array to read data into.//// offset:// The byte offset at which to begin reading.//// size:// The maximum number of bytes to read.//// Returns:// The number of bytes read.public virtual int ReadEntityBody(byte[] buffer, int offset, int size);//// Summary:// Adds a Content-Length HTTP header to the response for message bodies that// are less than or equal to 2 GB.//// Parameters:// contentLength:// The length of the response, in bytes.public virtual void SendCalculatedContentLength(int contentLength);//// Summary:// Adds a Content-Length HTTP header to the response for message bodies that// are greater than 2 GB.//// Parameters:// contentLength:// The length of the response, in bytes.public virtual void SendCalculatedContentLength(long contentLength);//// Summary:// Adds a standard HTTP header to the response.//// Parameters:// index:// The header index. For example, System.Web.HttpWorkerRequest.HeaderContentLength.//// value:// The value of the header.public abstract void SendKnownResponseHeader(int index, string value);//// Summary:// Adds the contents of the specified file to the response and specifies the// starting position in the file and the number of bytes to send.//// Parameters:// handle:// The handle of the file to send.//// offset:// The starting position in the file.//// length:// The number of bytes to send.public abstract void SendResponseFromFile(IntPtr handle, long offset, long length);//// Summary:// Adds the contents of the specified file to the response and specifies the// starting position in the file and the number of bytes to send.//// Parameters:// filename:// The name of the file to send.//// offset:// The starting position in the file.//// length:// The number of bytes to send.public abstract void SendResponseFromFile(string filename, long offset, long length);//// Summary:// Adds the specified number of bytes from a byte array to the response.//// Parameters:// data:// The byte array to send.//// length:// The number of bytes to send, starting at the first byte.public abstract void SendResponseFromMemory(byte[] data, int length);//// Summary:// Adds the specified number of bytes from a block of memory to the response.//// Parameters:// data:// An unmanaged pointer to the block of memory.//// length:// The number of bytes to send.public virtual void SendResponseFromMemory(IntPtr data, int length);//// Summary:// Specifies the HTTP status code and status description of the response, such// as SendStatus(200, "Ok").//// Parameters:// statusCode:// The status code to send//// statusDescription:// The status description to send.public abstract void SendStatus(int statusCode, string statusDescription);//// Summary:// Adds a nonstandard HTTP header to the response.//// Parameters:// name:// The name of the header to send.//// value:// The value of the header.public abstract void SendUnknownResponseHeader(string name, string value);//// Summary:// Registers for an optional notification when all the response data is sent.//// Parameters:// callback:// The notification callback that is called when all data is sent (out-of-band).//// extraData:// An additional parameter to the callback.public virtual void SetEndOfSendNotification(HttpWorkerRequest.EndOfSendNotification callback, object extraData);// Summary:// Represents the method that Notifies callers when sending of the response// is complete.//// Parameters:// wr:// The current System.Web.HttpWorkerRequest.//// extraData:// Any additional data needed to process the request.public delegate void EndOfSendNotification(HttpWorkerRequest wr, object extraData);} } View Code

該類是一個很底層的類，主要用于asp.net服務(wù)器內(nèi)部，在一些特殊情況下，可以完成一些特殊的任務(wù)，比如，上傳文件時，默認(rèn)情況下，asp.net會將上傳的文件內(nèi)容讀取到服務(wù)器的內(nèi)存中，然后通過控件的方式供我們使用。這種在上傳小文件的時候很方便，大文件的時候，服務(wù)器內(nèi)存將出現(xiàn)問題，導(dǎo)致瀏覽器不能將文件繼續(xù)傳輸。瀏覽器將顯示“The page cannot be displayed -cannot find server or dns error.”,這個錯誤無法在服務(wù)器端進(jìn)行捕獲或者處理。

借助HttpWorkerRequest的GetPreloadedEntityBody和ReadEntityBody方法，我們可以自己分塊從客戶端讀取上傳的文件內(nèi)容。然后將內(nèi)容保存在一個臨時文件中.

SlickUpload組件，就是基于這個實(shí)現(xiàn)的。感興趣的可以看看這篇文章，如何使用該組件。

http://blog.csdn.net/zhoufoxcn/article/details/5765748

?下載源碼

http://slickupload.com/

轉(zhuǎn)載于:https://www.cnblogs.com/wolf-sun/p/5196384.html

總結(jié)

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