c# 设置axwindows的User-agent信息

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        private static string defaultUserAgent = null;        [DllImport("urlmon.dll", CharSet = CharSet.Ansi)]        private static extern int UrlMkSetSessionOption(int dwOption, string pBuffer, int dwBufferLength, int dwReserved);        const int URLMON_OPTION_USERAGENT = 0x10000001;        /// <summary>        /// 在默认的UserAgent后面加一部分        /// </summary>        public static void AppendUserAgent(string appendUserAgent)        {            if (string.IsNullOrEmpty(defaultUserAgent))                defaultUserAgent = GetDefaultUserAgent();            string ua = defaultUserAgent + ";" + appendUserAgent;            ChangeUserAgent(ua);        }        /// <summary>        /// 修改UserAgent        /// </summary>        public static void ChangeUserAgent(string userAgent)        {            UrlMkSetSessionOption(URLMON_OPTION_USERAGENT, userAgent, userAgent.Length, 0);        }

使用该代码：

        public Form1()        {            this.MaximumSize = new Size(Screen.PrimaryScreen.WorkingArea.Width, Screen.PrimaryScreen.WorkingArea.Height);            InitializeComponent();            AppendUserAgent("QdBrow");            this.label1.Text = GetDefaultUserAgent();        }

测试效果：

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.2; Win64; x64; Trident/7.0; .NET4.0E; .NET4.0C; .NET CLR 3.5.30729; .NET CLR 2.0.50727; .NET CLR 3.0.30729; InfoPath.3);QdBrow

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