从网络路径下载文件

1.根据网络路径下的共享文件夹下载文件。

2.代码

（1）直接下载

WebClient wc = new WebClient()
                {
                    //Credentials = new NetworkCredential("Administrator", "Iphone6")
                    Credentials = CredentialCache.DefaultCredentials
                };
                wc.DownloadFile(@"\\192.168.1.131\share\"+filename,@"D:\"+filename);

WebClient的DownloadFile(网络路径位置，待存储位置)

（2）分片下载（可能需要用户名密码认证）

WebClient client = new WebClient()
                {
                    //Credentials = new NetworkCredential("Administrator", "Iphone6")
                    Credentials = CredentialCache.DefaultCredentials
                };
                Stream str = client.OpenRead(@"\\192.168.1.131\share\" + filename);
                StreamReader reader = new StreamReader(str);
                
                int allmybyte = (int)reader.BaseStream.Length;
                byte[] mbyte = new byte[allmybyte];
                int length = 4 * 1024 * 1024;
                int startmbyte = 0;
                while (allmybyte > 0)
                {
                    if (allmybyte m = str.ReadAsync(mbyte, startmbyte, length);
                    int m = str.Read(mbyte, startmbyte, length);
                    if (m == 0)
                        break;
                    startmbyte += m;
                    allmybyte -= m;
                }
                reader.Dispose();
                str.Dispose();
                string path = @"F:\" + filename;
                FileStream fstr = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write);
                fstr.Write(mbyte, 0, startmbyte);
                fstr.Flush();
                fstr.Close();