C#获取网页的HTML码,下载网站图片

1、根据URL请求获取页面HTML代码

/// <summary>  
/// 获取网页的HTML码  
/// </summary>  
/// <param name="url">链接地址</param>  
/// <param name="encoding">编码类型</param>  
/// <returns></returns>  
public static string GetHtmlStr(string url, string encoding)  
{  
    string htmlStr = "";  
    if (!String.IsNullOrEmpty(url))  
    {  
        WebRequest request = WebRequest.Create(url);            //实例化WebRequest对象  
        WebResponse response = request.GetResponse();           //创建WebResponse对象  
        Stream datastream = response.GetResponseStream();       //创建流对象  
        Encoding ec = Encoding.Default;  
        if (encoding == "UTF8")  
        {  
            ec = Encoding.UTF8;  
        }  
        else if (encoding == "Default")  
        {  
            ec = Encoding.Default;  
        }  
        StreamReader reader = new StreamReader(datastream, ec);  
        htmlStr = reader.ReadToEnd();                           //读取数据  
        reader.Close();  
        datastream.Close();  
        response.Close();  
    }  
    return htmlStr;  
}  

2、下载网站图片

/// <summary>  
/// 下载网站图片  
/// </summary>  
/// <param name="picUrl"></param>  
/// <returns></returns>  
public string SaveAsWebImg(string picUrl)  
{  
    string result = "";  
    string path = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"/File/";  //目录  
    try  
    {  
        if (!String.IsNullOrEmpty(picUrl))  
        {  
            Random rd = new Random();  
            DateTime nowTime = DateTime.Now;  
            string fileName = nowTime.Month.ToString() + nowTime.Day.ToString() + nowTime.Hour.ToString() + nowTime.Minute.ToString() + nowTime.Second.ToString() + rd.Next(1000, 1000000) + ".jpeg";  
            WebClient webClient = new WebClient();  
            webClient.DownloadFile(picUrl, path + fileName);  
            result = fileName;  
        }  
    }  
    catch { }  
    return result;  
}