我用以下函数来得到网页的html
可是得不到全部html啊，我把byte[] MyBytes = new byte[1024];
改成byte[] MyBytes = new byte[10240000];还是得不到全部html
而且byte[] MyBytes = new byte[204800];比上面的得到的html还多
这是怎么回事啊，html字节到底是怎么算的？

public string getHTML(string url)
        {
            try
            {                
                WebRequest webRequest = WebRequest.Create(url);
                WebResponse webResponse = webRequest.GetResponse();
                //确定该文件是二进制文件还是文本文件,网页是文本文件
                if (!webResponse.ContentType.ToLower().StartsWith("text/"))
                {
                    return null;
                }
                Stream stream = webResponse.GetResponseStream();
                byte[] MyBytes = new byte[1024];
                int MyBytesRead = stream.Read(MyBytes, 0, MyBytes.Length);               
                string html = System.Text.Encoding.Default.GetString(MyBytes, 0, MyBytesRead);
                //string html = System.Text.Encoding.Convert(Encoding.GetEncoding("byte"),Encoding.Default,MyBytes);  
                //判断编码，若为utf-8则重新读取
                Regex reg_charset = new Regex(@"charset\b\s*=\s*(?<charset>[^""]*)");
                if (reg_charset.IsMatch(html))
                {
                    if (reg_charset.Match(html).Groups["charset"].Value == "utf-8")
                    {
                        //html = Encoding.Convert(Encoding.Default,Encoding.UTF8,MyBytes).ToString();
                        html = System.Text.Encoding.UTF8.GetString(MyBytes, 0, MyBytesRead);
                    }
                }
                return html;
            }
            catch (UriFormatException ex)
            {

                Console.WriteLine(ex.Message);
                return null;
            }
            catch (WebException ex)
            {

                Console.WriteLine(ex.Message);
                return null;
            }
        }