获取url地址对应的图像

    /// <summary>
    /// 获取url地址对应的图像
    /// </summary>
    /// <param name="url"></param>
    /// <returns></returns>
    private Bitmap GetWebPic(string url)
    {
        try 
        { 
            WebResponse response = WebRequest.Create(url).GetResponse();
            Bitmap pic = (Bitmap)Bitmap.FromStream(response.GetResponseStream());
            return pic;
        }
        catch (Exception ex)
        {
            return null;
        }
    }

    /// <summary>
    /// 获取url地址对应的图像
    /// </summary>
    /// <param name="url"></param>
    /// <returns></returns>
    private Bitmap GetWebPic2(string url)
    {
        try
        {
            WebClient client = new WebClient();
            byte[] data = client.DownloadData(url);                       // 获取首个页面内容（无法获取附件）

            System.IO.MemoryStream stream = new System.IO.MemoryStream(); // 创建支持存储区的内存流
            stream.Write(data, 0, data.Length);

            Bitmap pic = (Bitmap)Bitmap.FromStream(stream);
            return pic;

        }
        catch (Exception ex)
        {
            return null;
        }
    }