lable显示问题

wujun_dry 2010-08-14 01:19:01

为什么我那个label显示内容要等到进度条到尽头的时候才改变过来啊！

帮帮忙啊！代码如下：



using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Net;

using System.IO;



namespace myUpload

{

    public partial class form1 : Form

    {

        public form1()

        {

            InitializeComponent();

        }

        private FtpStatusCode UploadFun(string fileName)

        {

            Stream requestStream = null;

            FileStream fileStream = null;

            FtpWebResponse uploadResponse = null;



            //显示原文件路径

            label1.Text = fileName;

            //构造目标路径

            FileInfo fileInf = new FileInfo(fileName);

            string uploadUrl = "ftp://192.168.4.88/tempUpload/" + fileInf.Name;



            try

            {

                //连接ftp服务器

                FtpWebRequest uploadRequest = (FtpWebRequest)WebRequest.Create(uploadUrl);

                uploadRequest.Method = WebRequestMethods.Ftp.UploadFile;

                uploadRequest.Proxy = null;

                NetworkCredential nc = new NetworkCredential();

                nc.UserName = "dry";

                nc.Password = "123456";

                uploadRequest.Credentials = nc;



                //上传

                requestStream = uploadRequest.GetRequestStream();

                fileStream = File.Open(fileName, FileMode.Open);

                byte[] buffer = new byte[1024];

                int bytesRead, i, t;



                i = Convert.ToInt32(fileStream.Length);

                t = i / 1024;

                progressBar1.Value = 0;

                progressBar1.Maximum = t + 2;

                while (true)

                {



                    bytesRead = fileStream.Read(buffer, 0, buffer.Length);

                    if (bytesRead == 0)

                    {

                        progressBar1.Value = progressBar1.Maximum;

                        MessageBox.Show(fileName + "文件上传成功！");

                        break;



                    }

                    else

                    {

                        requestStream.Write(buffer, 0, bytesRead);

                        progressBar1.Value++;



                    }



                }

                requestStream.Close();

                uploadResponse = (FtpWebResponse)uploadRequest.GetResponse();

                return uploadResponse.StatusCode;



            }

            catch (UriFormatException ex)

            {

                MessageBox.Show(ex.Message);

            }

            catch (IOException ex)

            {

                MessageBox.Show(ex.Message);

            }

            catch (WebException ex)

            {

                MessageBox.Show(ex.Message);

            }

            finally

            {

                if (uploadResponse != null)

                    uploadResponse.Close();

                if (fileStream != null)

                    fileStream.Close();

                if (requestStream != null)

                    requestStream.Close();



            }

            return FtpStatusCode.Undefined;

        }

        private void upLoadButton_Click(object sender, EventArgs e)

        {           

            UploadFun(@"D:\NBA\tmac_dunking.flv");

            UploadFun(@"D:\NBA\tamc nba成长之路.flv");

        }

    }

}