在winform当中如何判断文件是否下载完毕。

Question

我的下载类是：  private static bool SaveBinaryFile(WebResponse response, string FileName)
        {
            bool Value = true;
            byte[] buffer = new byte[1024];            try
            {
                if (File.Exists(FileName))
                    File.Delete(FileName);
                Stream outStream = System.IO.File.Create(FileName);
                Stream inStream = response.GetResponseStream();                int l;
                    do
                    {
                        l = inStream.Read(buffer, 0, buffer.Length);
                        if (l > 0)
                            outStream.Write(buffer, 0, l);
                    }
                    while (l > 0);                outStream.Close();
                inStream.Close();
            }
            catch
            {
                Value = false;
            }
            return Value;
        }
现在想在里面加上判断是否下载完毕，未下载完的话继续下载，下载完了退出，并返回value，请大家改下谢谢

Answer 1

       FileStream fileStream = new FileStream(FileName, FileMode.Append,  FileAccess.Write);   
                if (fileStream.Length == response.ContentLength)
                {
                    MessageBox.Show("你以完成下载该程序了", "ok");
                    Value = true;
                }
逻辑你自己组织吧

Answer 2

Encoding enc = Encoding.UTF8;
StreamReader sr = new StreamReader(st, enc);
sr.ReadToEnd();

Answer 3

outStream 与inStream 长度相等的时候就可以判断下载已完成了        private static int SaveBinaryFile(WebResponse response, string FileName)
        {
            int Value = 1;
            byte[] buffer = new byte[1024];            try
            {
                if (File.Exists(FileName))
                    File.Delete(FileName);
                Stream outStream = System.IO.File.Create(FileName);
                Stream inStream = response.GetResponseStream();                int l;
                    do
                    {
                        l = inStream.Read(buffer, 0, buffer.Length);
                        if (l > 0)
                            outStream.Write(buffer, 0, l);
                    }
                    while (l > 0);
                if(outStream.Length == inStream.Length)
                    Value = 0;
                outStream.Close();
                inStream.Close();
            }
            catch
            {
                Value = -1;
            }            return Value;//失败返回-1,成功返回1,下载完成返回0
        }