C#爬蟲助手快速發(fā)送Post和Get請(qǐng)求幫助類

C#爬蟲助手幫助類：快速發(fā)送Post和Get請(qǐng)求幫助類，Http連接幫助類，

HttpHelper幫助類，可快速提取網(wǎng)頁(yè)Byte數(shù)據(jù)得到圖片文件實(shí)體 

HttpHelper幫助類源碼下載：

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;
using System.Text.RegularExpressions;
using System.IO.Compression;
using System.Security.Cryptography.X509Certificates;
using System.Net.Security;
using System.Linq;
using System.Net.Cache;

namespace JsonsUtil.Helper
{
    /// <summary>
    /// Http連接幫助類
    /// </summary>
    public class HttpHelper
    {
        #region 預(yù)定義方變量
        //默認(rèn)的編碼
        private Encoding encoding = Encoding.Default;
        //Post數(shù)據(jù)編碼
        private Encoding postencoding = Encoding.Default;
        //HttpWebRequest對(duì)象用來發(fā)起請(qǐng)求
        private HttpWebRequest request = null;
        //獲取影響流的數(shù)據(jù)對(duì)象
        private HttpWebResponse response = null;
        #endregion

        #region Public

        /// <summary>
        /// 根據(jù)相傳入的數(shù)據(jù)，得到相應(yīng)頁(yè)面數(shù)據(jù)
        /// </summary>
        /// <param name="item">參數(shù)類對(duì)象</param>
        /// <returns>返回HttpResult類型</returns>
        public HttpResult GetHtml(HttpItem item)
        {
            //返回參數(shù)
            HttpResult result = new HttpResult();
            try
            {
                //準(zhǔn)備參數(shù)
                SetRequest(item);
            }
            catch (Exception ex)
            {
                //配置參數(shù)時(shí)出錯(cuò)
                return new HttpResult() { Cookie = string.Empty, Header = null, Html = ex.Message, StatusDescription = "配置參數(shù)時(shí)出錯(cuò)："   ex.Message };
            }
            try
            {
                //請(qǐng)求數(shù)據(jù)
                using (response = (HttpWebResponse)request.GetResponse())
                {
                    GetData(item, result);
                }
            }
            catch (WebException ex)
            {
                if (ex.Response != null)
                {
                    using (response = (HttpWebResponse)ex.Response)
                    {
                        GetData(item, result);
                    }
                }
                else
                {
                    result.Html = ex.Message;
                }
            }
            catch (Exception ex)
            {
                result.Html = ex.Message;
            }
            if (item.IsToLower) result.Html = result.Html.ToLower();
            return result;
        }
        #endregion

        #region GetData

        /// <summary>
        /// 獲取數(shù)據(jù)的并解析的方法
        /// </summary>
        /// <param name="item"></param>
        /// <param name="result"></param>
        private void GetData(HttpItem item, HttpResult result)
        {
            #region base
            //獲取StatusCode
            result.StatusCode = response.StatusCode;
            //獲取StatusDescription
            result.StatusDescription = response.StatusDescription;
            //獲取Headers
            result.Header = response.Headers;
            //獲取最后訪問的URl
            result.ResponseUri = response.ResponseUri.ToString();
            //獲取CookieCollection
            if (response.Cookies != null) result.CookieCollection = response.Cookies;
            //獲取set-cookie
            if (response.Headers["set-cookie"] != null) result.Cookie = response.Headers["set-cookie"];
            //獲取HttpWebResponse
            if (response.ContentEncoding != null)
            {
                result.WebRes = response.ContentEncoding   response.Headers["Accept-Encoding"];
            }
            #endregion

            #region byte
            //處理網(wǎng)頁(yè)Byte
            byte[] ResponseByte = GetByte();
            #endregion

            #region Html
            if (ResponseByte != null & ResponseByte.Length > 0)
            {
                //設(shè)置編碼
                SetEncoding(item, result, ResponseByte);
                //得到返回的HTML
                result.Html = encoding.GetString(ResponseByte);
            }
            else
            {
                //沒有返回任何Html代碼
                result.Html = string.Empty;
            }
            #endregion
        }
        /// <summary>
        /// 設(shè)置編碼
        /// </summary>
        /// <param name="item">HttpItem</param>
        /// <param name="result">HttpResult</param>
        /// <param name="ResponseByte">byte[]</param>
        private void SetEncoding(HttpItem item, HttpResult result, byte[] ResponseByte)
        {
            //是否返回Byte類型數(shù)據(jù)
            if (item.ResultType == ResultType.Byte) result.ResultByte = ResponseByte;
            //從這里開始我們要無視編碼了//<meta[^<]*charset=([^<]*)[\"']
            if (encoding == null)
            {
                Match meta = Regex.Match(Encoding.Default.GetString(ResponseByte), "<meta[^<]*charset=([^<]*)[\"']", RegexOptions.IgnoreCase);
                string c = string.Empty;
                if (meta != null && meta.Groups.Count > 0)
                {
                    c = meta.Groups[1].Value.ToLower().Trim();
                    if (c.Length < 2)
                    {
                        meta = Regex.Match(Encoding.Default.GetString(ResponseByte), "<meta[^<]*charset=([^<]*)", RegexOptions.IgnoreCase);
                        if (meta != null && meta.Groups.Count > 0)
                        {
                            c = meta.Groups[1].Value.ToLower().Trim();
                        }
                    }
                }
                if (c.Length > 2)
                {
                    try
                    {
                        encoding = Encoding.GetEncoding(c.Replace("/>", string.Empty).Replace("\"", string.Empty).Replace("'", "").Replace(";", "").Replace("iso-8859-1", "gbk").Trim());
                    }
                    catch
                    {
                        if (string.IsNullOrEmpty(response.CharacterSet))
                        {
                            encoding = Encoding.UTF8;
                        }
                        else
                        {
                            encoding = Encoding.GetEncoding(response.CharacterSet);
                        }
                    }
                }
                else
                {
                    if (string.IsNullOrEmpty(response.CharacterSet))
                    {
                        encoding = Encoding.UTF8;
                    }
                    else
                    {
                        encoding = Encoding.GetEncoding(response.CharacterSet);
                    }
                }
            }
        }
        /// <summary>
        /// 提取網(wǎng)頁(yè)Byte
        /// </summary>
        /// <returns></returns>
        private byte[] GetByte()
        {
            byte[] ResponseByte = null;
            using (MemoryStream _stream = new MemoryStream())
            {
                //GZIIP處理
                if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))
                {
                    //開始讀取流并設(shè)置編碼方式
                    new GZipStream(response.GetResponseStream(), CompressionMode.Decompress).CopyTo(_stream, 10240);
                }
                else
                {
                    //開始讀取流并設(shè)置編碼方式
                    response.GetResponseStream().CopyTo(_stream, 10240);
                }
                //獲取Byte
                ResponseByte = _stream.ToArray();
            }
            return ResponseByte;
        }
        #endregion

        #region SetRequest

        /// <summary>
        /// 為請(qǐng)求準(zhǔn)備參數(shù)
        /// </summary>
        ///<param name="item">參數(shù)列表</param>
        private void SetRequest(HttpItem item)
        {
            // 驗(yàn)證證書
            SetCer(item);
            //設(shè)置Header參數(shù)
            if (item.Header != null && item.Header.Count > 0) foreach (string key in item.Header.AllKeys)
                {
                    request.Headers.Add(key, item.Header[key]);
                }
            // 設(shè)置代理
            SetProxy(item);
            if (item.ProtocolVersion != null) request.ProtocolVersion = item.ProtocolVersion;
            request.ServicePoint.Expect100Continue = item.Expect100Continue;
            //請(qǐng)求方式Get或者Post
            request.Method = item.Method;
            request.Timeout = item.Timeout;
            request.KeepAlive = item.KeepAlive;
            request.ReadWriteTimeout = item.ReadWriteTimeout;
            if (!string.IsNullOrWhiteSpace(item.Host))
            {
                request.Host = item.Host;
            }
            if (item.IfModifiedSince != null) request.IfModifiedSince = Convert.ToDateTime(item.IfModifiedSince);
            //Accept
            request.Accept = item.Accept;
            //ContentType返回類型
            request.ContentType = item.ContentType;
            //UserAgent客戶端的訪問類型，包括瀏覽器版本和操作系統(tǒng)信息
            request.UserAgent = item.UserAgent;
            // 編碼
            encoding = item.Encoding;
            //設(shè)置安全憑證
            request.Credentials = item.ICredentials;
            //設(shè)置Cookie
            SetCookie(item);
            //來源地址
            request.Referer = item.Referer;
            //是否執(zhí)行跳轉(zhuǎn)功能
            request.AllowAutoRedirect = item.Allowautoredirect;
            if (item.MaximumAutomaticRedirections > 0)
            {
                request.MaximumAutomaticRedirections = item.MaximumAutomaticRedirections;
            }
            //設(shè)置Post數(shù)據(jù)
            SetPostData(item);
            //設(shè)置最大連接
            if (item.Connectionlimit > 0) request.ServicePoint.ConnectionLimit = item.Connectionlimit;
        }
        /// <summary>
        /// 設(shè)置證書
        /// </summary>
        /// <param name="item"></param>
        private void SetCer(HttpItem item)
        {
            if (!string.IsNullOrWhiteSpace(item.CerPath))
            {
                //這一句一定要寫在創(chuàng)建連接的前面。使用回調(diào)的方法進(jìn)行證書驗(yàn)證。
                ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
                //初始化對(duì)像，并設(shè)置請(qǐng)求的URL地址
                request = (HttpWebRequest)WebRequest.Create(item.URL);
                SetCerList(item);
                //將證書添加到請(qǐng)求里
                request.ClientCertificates.Add(new X509Certificate(item.CerPath));
            }
            else
            {
                //初始化對(duì)像，并設(shè)置請(qǐng)求的URL地址
                request = (HttpWebRequest)WebRequest.Create(item.URL);
                SetCerList(item);
            }
        }
        /// <summary>
        /// 設(shè)置多個(gè)證書
        /// </summary>
        /// <param name="item"></param>
        private void SetCerList(HttpItem item)
        {
            if (item.ClentCertificates != null && item.ClentCertificates.Count > 0)
            {
                foreach (X509Certificate c in item.ClentCertificates)
                {
                    request.ClientCertificates.Add(c);
                }
            }
        }
        /// <summary>
        /// 設(shè)置Cookie
        /// </summary>
        /// <param name="item">Http參數(shù)</param>
        private void SetCookie(HttpItem item)
        {
            if (!string.IsNullOrEmpty(item.Cookie)) request.Headers[HttpRequestHeader.Cookie] = item.Cookie;
            //設(shè)置CookieCollection
            if (item.ResultCookieType == ResultCookieType.CookieCollection)
            {
                request.CookieContainer = new CookieContainer();
                if (item.CookieCollection != null && item.CookieCollection.Count > 0)
                    request.CookieContainer.Add(item.CookieCollection);
            }
        }
        /// <summary>
        /// 設(shè)置Post數(shù)據(jù)
        /// </summary>
        /// <param name="item">Http參數(shù)</param>
        private void SetPostData(HttpItem item)
        {
            //驗(yàn)證在得到結(jié)果時(shí)是否有傳入數(shù)據(jù)
            if (!request.Method.Trim().ToLower().Contains("get"))
            {
                if (item.PostEncoding != null)
                {
                    postencoding = item.PostEncoding;
                }
                byte[] buffer = null;
                //寫入Byte類型
                if (item.PostDataType == PostDataType.Byte && item.PostdataByte != null && item.PostdataByte.Length > 0)
                {
                    //驗(yàn)證在得到結(jié)果時(shí)是否有傳入數(shù)據(jù)
                    buffer = item.PostdataByte;
                }//寫入文件
                else if (item.PostDataType == PostDataType.FilePath && !string.IsNullOrWhiteSpace(item.Postdata))
                {
                    StreamReader r = new StreamReader(item.Postdata, postencoding);
                    buffer = postencoding.GetBytes(r.ReadToEnd());
                    r.Close();
                } //寫入字符串
                else if (!string.IsNullOrWhiteSpace(item.Postdata))
                {
                    buffer = postencoding.GetBytes(item.Postdata);
                }
                if (buffer != null)
                {
                    request.ContentLength = buffer.Length;
                    request.GetRequestStream().Write(buffer, 0, buffer.Length);
                }
            }
        }
        /// <summary>
        /// 設(shè)置代理
        /// </summary>
        /// <param name="item">參數(shù)對(duì)象</param>
        private void SetProxy(HttpItem item)
        {
            bool isIeProxy = false;
            if (!string.IsNullOrWhiteSpace(item.ProxyIp))
            {
                isIeProxy = item.ProxyIp.ToLower().Contains("ieproxy");
            }
            if (!string.IsNullOrWhiteSpace(item.ProxyIp) && !isIeProxy)
            {
                //設(shè)置代理服務(wù)器
                if (item.ProxyIp.Contains(":"))
                {
                    string[] plist = item.ProxyIp.Split(':');
                    WebProxy myProxy = new WebProxy(plist[0].Trim(), Convert.ToInt32(plist[1].Trim()));
                    //建議連接
                    myProxy.Credentials = new NetworkCredential(item.ProxyUserName, item.ProxyPwd);
                    //給當(dāng)前請(qǐng)求對(duì)象
                    request.Proxy = myProxy;
                }
                else
                {
                    WebProxy myProxy = new WebProxy(item.ProxyIp, false);
                    //建議連接
                    myProxy.Credentials = new NetworkCredential(item.ProxyUserName, item.ProxyPwd);
                    //給當(dāng)前請(qǐng)求對(duì)象
                    request.Proxy = myProxy;
                }
            }
            else if (isIeProxy)
            {
                //設(shè)置為IE代理
            }
            else
            {
                request.Proxy = item.WebProxy;
            }
        }
        #endregion

        #region private main
        /// <summary>
        /// 回調(diào)驗(yàn)證證書問題
        /// </summary>
        /// <param name="sender">流對(duì)象</param>
        /// <param name="certificate">證書</param>
        /// <param name="chain">X509Chain</param>
        /// <param name="errors">SslPolicyErrors</param>
        /// <returns>bool</returns>
        private bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { return true; }
        #endregion
    }

    #region public calss
    /// <summary>
    /// Http請(qǐng)求參考類
    /// </summary>
    public class HttpItem
    {
        /// <summary>
        /// 請(qǐng)求URL必須填寫
        /// </summary>
        public string URL { get; set; }
        string _Method = "GET";
        /// <summary>
        /// 請(qǐng)求方式默認(rèn)為GET方式,當(dāng)為POST方式時(shí)必須設(shè)置Postdata的值
        /// </summary>
        public string Method
        {
            get { return _Method; }
            set { _Method = value; }
        }
        int _Timeout = 100000;
        /// <summary>
        /// 默認(rèn)請(qǐng)求超時(shí)時(shí)間
        /// </summary>
        public int Timeout
        {
            get { return _Timeout; }
            set { _Timeout = value; }
        }
        int _ReadWriteTimeout = 30000;
        /// <summary>
        /// 默認(rèn)寫入Post數(shù)據(jù)超時(shí)間
        /// </summary>
        public int ReadWriteTimeout
        {
            get { return _ReadWriteTimeout; }
            set { _ReadWriteTimeout = value; }
        }
        /// <summary>
        /// 設(shè)置Host的標(biāo)頭信息
        /// </summary>
        public string Host { get; set; }
        Boolean _KeepAlive = true;
        /// <summary>
        ///  獲取或設(shè)置一個(gè)值，該值指示是否與 Internet 資源建立持久性連接默認(rèn)為true。
        /// </summary>
        public Boolean KeepAlive
        {
            get { return _KeepAlive; }
            set { _KeepAlive = value; }
        }
        string _Accept = "text/html, application/xhtml xml, */*";
        /// <summary>
        /// 請(qǐng)求標(biāo)頭值 默認(rèn)為text/html, application/xhtml xml, */*
        /// </summary>
        public string Accept
        {
            get { return _Accept; }
            set { _Accept = value; }
        }
        string _ContentType = "text/html";
        /// <summary>
        /// 請(qǐng)求返回類型默認(rèn) text/html
        /// </summary>
        public string ContentType
        {
            get { return _ContentType; }
            set { _ContentType = value; }
        }
        string _UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)";
        /// <summary>
        /// 客戶端訪問信息默認(rèn)Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)
        /// </summary>
        public string UserAgent
        {
            get { return _UserAgent; }
            set { _UserAgent = value; }
        }
        /// <summary>
        /// 返回?cái)?shù)據(jù)編碼默認(rèn)為NUll,可以自動(dòng)識(shí)別,一般為utf-8,gbk,gb2312
        /// </summary>
        public Encoding Encoding { get; set; }
        private PostDataType _PostDataType = PostDataType.String;
        /// <summary>
        /// Post的數(shù)據(jù)類型
        /// </summary>
        public PostDataType PostDataType
        {
            get { return _PostDataType; }
            set { _PostDataType = value; }
        }
        /// <summary>
        /// Post請(qǐng)求時(shí)要發(fā)送的字符串Post數(shù)據(jù)
        /// </summary>
        public string Postdata { get; set; }
        /// <summary>
        /// Post請(qǐng)求時(shí)要發(fā)送的Byte類型的Post數(shù)據(jù)
        /// </summary>
        public byte[] PostdataByte { get; set; }
        /// <summary>
        /// Cookie對(duì)象集合
        /// </summary>
        public CookieCollection CookieCollection { get; set; }
        /// <summary>
        /// 請(qǐng)求時(shí)的Cookie
        /// </summary>
        public string Cookie { get; set; }
        /// <summary>
        /// 來源地址，上次訪問地址
        /// </summary>
        public string Referer { get; set; }
        /// <summary>
        /// 證書絕對(duì)路徑
        /// </summary>
        public string CerPath { get; set; }
        /// <summary>
        /// 設(shè)置代理對(duì)象，不想使用IE默認(rèn)配置就設(shè)置為Null，而且不要設(shè)置ProxyIp
        /// </summary>
        public WebProxy WebProxy { get; set; }
        private Boolean isToLower = false;
        /// <summary>
        /// 是否設(shè)置為全文小寫，默認(rèn)為不轉(zhuǎn)化
        /// </summary>
        public Boolean IsToLower
        {
            get { return isToLower; }
            set { isToLower = value; }
        }
        private Boolean allowautoredirect = false;
        /// <summary>
        /// 支持跳轉(zhuǎn)頁(yè)面，查詢結(jié)果將是跳轉(zhuǎn)后的頁(yè)面，默認(rèn)是不跳轉(zhuǎn)
        /// </summary>
        public Boolean Allowautoredirect
        {
            get { return allowautoredirect; }
            set { allowautoredirect = value; }
        }
        private int connectionlimit = 1024;
        /// <summary>
        /// 最大連接數(shù)
        /// </summary>
        public int Connectionlimit
        {
            get { return connectionlimit; }
            set { connectionlimit = value; }
        }
        /// <summary>
        /// 代理Proxy 服務(wù)器用戶名
        /// </summary>
        public string ProxyUserName { get; set; }
        /// <summary>
        /// 代理 服務(wù)器密碼
        /// </summary>
        public string ProxyPwd { get; set; }
        /// <summary>
        /// 代理 服務(wù)IP,如果要使用IE代理就設(shè)置為ieproxy
        /// </summary>
        public string ProxyIp { get; set; }
        private ResultType resulttype = ResultType.String;
        /// <summary>
        /// 設(shè)置返回類型String和Byte
        /// </summary>
        public ResultType ResultType
        {
            get { return resulttype; }
            set { resulttype = value; }
        }
        private WebHeaderCollection header = new WebHeaderCollection();
        /// <summary>
        /// header對(duì)象
        /// </summary>
        public WebHeaderCollection Header
        {
            get { return header; }
            set { header = value; }
        }
        /// <summary>
        //     獲取或設(shè)置用于請(qǐng)求的 HTTP 版本。返回結(jié)果:用于請(qǐng)求的 HTTP 版本。默認(rèn)為 System.Net.HttpVersion.Version11。
        /// </summary>
        public Version ProtocolVersion { get; set; }
        private Boolean _expect100continue = true;
        /// <summary>
        ///  獲取或設(shè)置一個(gè) System.Boolean 值，該值確定是否使用 100-Continue 行為。如果 POST 請(qǐng)求需要 100-Continue 響應(yīng)，則為 true；否則為 false。默認(rèn)值為 true。
        /// </summary>
        public Boolean Expect100Continue
        {
            get { return _expect100continue; }
            set { _expect100continue = value; }
        }
        /// <summary>
        /// 設(shè)置509證書集合
        /// </summary>
        public X509CertificateCollection ClentCertificates { get; set; }
        /// <summary>
        /// 設(shè)置或獲取Post參數(shù)編碼,默認(rèn)的為Default編碼
        /// </summary>
        public Encoding PostEncoding { get; set; }
        private ResultCookieType _ResultCookieType = ResultCookieType.String;
        /// <summary>
        /// Cookie返回類型,默認(rèn)的是只返回字符串類型
        /// </summary>
        public ResultCookieType ResultCookieType
        {
            get { return _ResultCookieType; }
            set { _ResultCookieType = value; }
        }
        private ICredentials _ICredentials = CredentialCache.DefaultCredentials;
        /// <summary>
        /// 獲取或設(shè)置請(qǐng)求的身份驗(yàn)證信息。
        /// </summary>
        public ICredentials ICredentials
        {
            get { return _ICredentials; }
            set { _ICredentials = value; }
        }
        /// <summary>
        /// 設(shè)置請(qǐng)求將跟隨的重定向的最大數(shù)目
        /// </summary>
        public int MaximumAutomaticRedirections { get; set; }
        private DateTime? _IfModifiedSince = null;
        /// <summary>
        /// 獲取和設(shè)置IfModifiedSince，默認(rèn)為當(dāng)前日期和時(shí)間
        /// </summary>
        public DateTime? IfModifiedSince
        {
            get { return _IfModifiedSince; }
            set { _IfModifiedSince = value; }
        }

    }
    /// <summary>
    /// Http返回參數(shù)類
    /// </summary>
    public class HttpResult
    {
        /// <summary>
        /// 獲取HttpWebResponse信息
        /// </summary>
        public string WebRes { get; set; }
        /// <summary>
        /// Http請(qǐng)求返回的Cookie
        /// </summary>
        public string Cookie { get; set; }
        /// <summary>
        /// Cookie對(duì)象集合
        /// </summary>
        public CookieCollection CookieCollection { get; set; }
        private string _html = string.Empty;
        /// <summary>
        /// 返回的String類型數(shù)據(jù) 只有ResultType.String時(shí)才返回?cái)?shù)據(jù)，其它情況為空
        /// </summary>
        public string Html
        {
            get { return _html; }
            set { _html = value; }
        }
        /// <summary>
        /// 返回的Byte數(shù)組 只有ResultType.Byte時(shí)才返回?cái)?shù)據(jù)，其它情況為空
        /// </summary>
        public byte[] ResultByte { get; set; }
        /// <summary>
        /// header對(duì)象
        /// </summary>
        public WebHeaderCollection Header { get; set; }
        /// <summary>
        /// 返回狀態(tài)說明
        /// </summary>
        public string StatusDescription { get; set; }
        /// <summary>
        /// 返回狀態(tài)碼,默認(rèn)為OK
        /// </summary>
        public HttpStatusCode StatusCode { get; set; }
        /// <summary>
        /// 最后訪問的URl
        /// </summary>
        public string ResponseUri { get; set; }
        /// <summary>
        /// 獲取重定向的URl
        /// </summary>
        public string RedirectUrl
        {
            get
            {
                try
                {
                    if (Header != null && Header.Count > 0)
                    {
                        if (Header.AllKeys.Any(k => k.ToLower().Contains("location")))
                        {
                            string locationurl = Header["location"].ToString().ToLower();

                            if (!string.IsNullOrWhiteSpace(locationurl))
                            {
                                bool b = locationurl.StartsWith("http://") || locationurl.StartsWith("https://");
                                if (!b)
                                {
                                    locationurl = new Uri(new Uri(ResponseUri), locationurl).AbsoluteUri;
                                }
                            }
                            return locationurl;
                        }
                    }
                }
                catch { }
                return string.Empty;
            }
        }
    }
    /// <summary>
    /// 返回類型
    /// </summary>
    public enum ResultType
    {
        /// <summary>
        /// 表示只返回字符串 只有Html有數(shù)據(jù)
        /// </summary>
        String,
        /// <summary>
        /// 表示返回字符串和字節(jié)流 ResultByte和Html都有數(shù)據(jù)返回
        /// </summary>
        Byte
    }
    /// <summary>
    /// Post的數(shù)據(jù)格式默認(rèn)為string
    /// </summary>
    public enum PostDataType
    {
        /// <summary>
        /// 字符串類型，這時(shí)編碼Encoding可不設(shè)置
        /// </summary>
        String,
        /// <summary>
        /// Byte類型，需要設(shè)置PostdataByte參數(shù)的值編碼Encoding可設(shè)置為空
        /// </summary>
        Byte,
        /// <summary>
        /// 傳文件，Postdata必須設(shè)置為文件的絕對(duì)路徑，必須設(shè)置Encoding的值
        /// </summary>
        FilePath
    }
    /// <summary>
    /// Cookie返回類型
    /// </summary>
    public enum ResultCookieType
    {
        /// <summary>
        /// 只返回字符串類型的Cookie
        /// </summary>
        String,
        /// <summary>
        /// CookieCollection格式的Cookie集合同時(shí)也返回String類型的cookie
        /// </summary>
        CookieCollection
    }
    #endregion
}

原文鏈接：C#爬蟲助手快速發(fā)送Post和Get請(qǐng)求幫助類