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对于客户端和服务器系统之间的文件传输，我们使用 C# windows 窗体在客户端系统上设计了一个 GUI。我们添加了许多背景图像和文本框，以使 GUI 令人印象深刻。但是每当我们执行客户端代码时，GUI 需要几秒钟来加载自身并保持稳定，然后才能从 GUI 中做出选择。这发生在客户端 GUI 发出的每个请求之后。（就像所有表单元素消失并在短时间内再次出现）。请帮助解决这个问题。我可以知道它的原因。

  using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.IO;

namespace Client405
{
    public partial class RequestForm : Form
    {
        #region Variables
        internal static ListBox FileListBox;
        internal static byte[] RecievedFile = new byte[46000000];
        internal static string StoragePath = string.Empty;
        internal static bool CacheSelected = false;
        internal static string ChosenTech = "Default";
        internal static bool EnableCompression = false;
        //internal static string FileType;
        internal static string SelectedFile = string.Empty;
        internal static Stopwatch watch = new Stopwatch();
        #endregion

        public RequestForm()
        {
            InitializeComponent();
            this.Load += new EventHandler(RequestForm_Load);
            this.DoubleBuffered = true;
        }

        void RequestForm_Load(object sender, EventArgs e)
        {

            ComprMsgLabel.Text = "Compression Technique chosen is :" + ChosenTech;
            FileListBox = new ListBox();
            FileName_textBox.Enabled = true;
            FileName_textBox.ReadOnly = true;

            if (!Connections.SocketConnected())
            {
                Connections.EstablishConnectionWithServer();
            }

            if (LoginAuthenticator.registered)
            {
                EnableCompression = true;
                CacheSelected = true;
                RegisterlinkLabel.Visible = false;

                HighRB.Enabled = true;
                LowRB.Enabled = true;
                MediumRB.Enabled = true;
                CacheMsg_label.Text = "Caching Enabled";
            }
            else if (!LoginAuthenticator.registered)
            {
                RegisterlinkLabel.Visible = true;
                RegisterlinkLabel.Show();
                Logout_Label.Text = "Home Page";
                Cache_checkBox.CheckState = CheckState.Unchecked;
                Cache_checkBox.Enabled = false;
                EnableCompr_checkBox.Enabled = false;
                HighRB.Enabled = false;
                LowRB.Enabled = false;
                MediumRB.Enabled = false;
                DefaultRB.Visible = false;
                NoneRB.Visible = false;
                DefaultRB.Enabled = false;
                NoneRB.Enabled = false;
                CacheMsg_label.Text = "Caching Disabled";
            }

            ChosenTech = "None";
            LogUser_Label.Text = LogUser_Label.Text + LoginAuthenticator.myCurrentUser;
            SetClientInfo();
        }

        private void SetClientInfo()
        {
            //LogUser_Label.Text = LoginAuthenticator.myCurrentUser;
            HostValue_Label.Text = HelperInfo.HostNameValue;

            //Add port info
            Port_Value.Text = HelperInfo.PortNumber;

            //Add IP address
            IPAddr_value.Text = HelperInfo.IPAddress_client;

            //Add Gateway info
            Gateway_value.Text = HelperInfo.Default_Gateway;

            //Add the ip address of server connected to
            ServerIP_Value_Label.Text = HelperInfo.Connected_To(Connections.myClientSocket);

            if (Connections.myClientSocket.Connected)
            {
                ONOFF_radio.Text = "Online";
            }
            else
            {
                ONOFF_radio.Text = "Offline";
            }
        }

        private void GetFile_Button_Click(object sender, EventArgs e)
        {
            if ((AudioRB.Checked == false) && (ImageRB.Checked == false) && (TextRB.Checked == false))
            {
                MessageBox.Show("Please select a File Type");
                return;
            }

            if (SelectedFile == string.Empty)
            {
                MessageBox.Show("Please Select a File");
                return;
            }

            if (!LoginAuthenticator.registered)
            {
                FileTransfer.UnRegisteredTransfer();
                this.Refresh();
                MessageBox.Show("Transaction Completed");
            }

            if (LoginAuthenticator.registered)
            {
                DialogResult trans_reqd = DialogResult.No;
                //check Cache
                if (Cache_checkBox.CheckState == CheckState.Checked)
                {
                    trans_reqd = FileCache.TransactionQuery(RequestForm.SelectedFile);
                    if (trans_reqd == DialogResult.No)
                    {
                        string[] files = { System.IO.Path.Combine(@"D:\\FT\\Cache", RequestForm.SelectedFile), System.IO.Path.Combine(@"D:\\FT\\Downloads", RequestForm.SelectedFile) };

                        if (System.IO.File.Exists(files[1]))
                        {
                            System.IO.File.Delete(files[1]);
                        }
                        System.IO.File.Copy(files[0], files[1]);
                        watch.Stop();
                    }
                    else          //if not in cacheF
                    {
                        FileTransfer.RegisteredTransfer();
                    }
                }
                else                //if caching not enabled
                {

                    FileTransfer.RegisteredTransfer();
                }

                this.Refresh();
                MessageBox.Show("Transaction Completed");
            }
        }

        private void AudioRB_CheckedChanged(object sender, EventArgs e)
        {

            ChosenTech = "Default";
            if (AudioRB.Checked == true)
            {
                ImageRB.Checked = false;
                TextRB.Checked = false;
                EnableCompr_checkBox.CheckState = CheckState.Unchecked;
                EnableCompr_checkBox.Visible = false;
                EnableCompr_checkBox.Enabled = false;
                FileListBox.Hide();
                DisplayRadioButtons();
                SelectedFile = string.Empty;
                FileName_textBox.Text = string.Empty;
                FileTransfer.FileType = "Audio";
                //ViewFiles_button.Visible = true;
                ViewFiles();
            }
            else if (AudioRB.Checked == false)
            {
                //ViewFiles_button.Visible = false;
                EnableCompr_checkBox.Visible = true;
                EnableCompr_checkBox.Enabled = true;
                FileListBox.Hide();
            }
        }

        private void ViewFiles()
        {
            FileTransfer.GetFileNames();
            this.Controls.Add(RequestForm.FileListBox);
            RequestForm.FileListBox.BringToFront();
            RequestForm.FileListBox.Visible = true;
            RequestForm.FileListBox.SelectedIndexChanged += new EventHandler(listBox1_SelectedIndexChanged);
            //RequestForm.SelectedFile = FileTransfer.FileListView.SelectedItems[0].Text;
            //FileName_textBox.Text = RequestForm.SelectedFile;
        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            FileName_textBox.Text = FileListBox.SelectedItem.ToString();
            RequestForm.SelectedFile = FileName_textBox.Text;
        }

        private void ImageRB_CheckedChanged(object sender, EventArgs e)
        {
            ChosenTech = "Default";
            if (ImageRB.Checked == true && LoginAuthenticator.registered)
            {
                AudioRB.Checked = false;
                TextRB.Checked = false;
                EnableCompr_checkBox.CheckState = CheckState.Unchecked;
                EnableCompr_checkBox.Enabled = true;
                EnableCompr_checkBox.Visible = true;
                FileListBox.Hide();
                FileTransfer.FileType = "Image";
                SelectedFile = string.Empty;
                FileName_textBox.Text = string.Empty;
                DisplayRadioButtons();
                ViewFiles();
                //ViewFiles_button.Visible = true;
            }
            else if (ImageRB.Checked == true && !LoginAuthenticator.registered)
            {
                AudioRB.Checked = false;
                TextRB.Checked = false;
                EnableCompr_checkBox.CheckState = CheckState.Unchecked;
                EnableCompr_checkBox.Enabled = false;
                EnableCompr_checkBox.Visible = true;
                FileListBox.Hide();
                FileTransfer.FileType = "Image";
                SelectedFile = string.Empty;
                FileName_textBox.Text = string.Empty;
                DisplayRadioButtons();
                ViewFiles();
            }
            else if (ImageRB.Checked == false)
            {
                //ViewFiles_button.Visible = false;
                RequestForm.FileListBox.Hide();
            }
        }

        private void TextRB_CheckedChanged(object sender, EventArgs e)
        {
            ChosenTech = "Default";
            if (TextRB.Checked == true && LoginAuthenticator.registered)
            {

                ImageRB.Checked = false;
                AudioRB.Checked = false;
                EnableCompr_checkBox.CheckState = CheckState.Unchecked;
                EnableCompr_checkBox.Enabled = true;
                EnableCompr_checkBox.Visible = true;
                RequestForm.FileListBox.Hide();
                DisplayRadioButtons();
                FileTransfer.FileType = "Text";
                SelectedFile = string.Empty;
                FileName_textBox.Text = string.Empty;
                ViewFiles();
                //ViewFiles_button.Visible = true;

            }
            else if (TextRB.Checked == true && !LoginAuthenticator.registered)
            {
                ImageRB.Checked = false;
                AudioRB.Checked = false;
                EnableCompr_checkBox.CheckState = CheckState.Unchecked;
                EnableCompr_checkBox.Enabled = false;
                EnableCompr_checkBox.Visible = true;
                RequestForm.FileListBox.Hide();
                DisplayRadioButtons();
                FileTransfer.FileType = "Text";
                SelectedFile = string.Empty;
                FileName_textBox.Text = string.Empty;
                ViewFiles();
            }
            else if (TextRB.Checked == false)
            {
                //ViewFiles_button.Visible = false;
                RequestForm.FileListBox.Hide();
            }
        }

        private void Cache_checkBox_CheckedChanged(object sender, EventArgs e)
        {
            if (Cache_checkBox.Checked)
            {
                CacheMsg_label.Text = "Caching Enabled";
                CacheSelected = true;
            }
            else
            {
                CacheMsg_label.Text = "Caching Disabled";
                CacheSelected = false;
            }
        }

        private void EnableCompr_checkBox_CheckedChanged(object sender, EventArgs e)
        {
            DisplayRadioButtons();
        }

        internal void DisplayRadioButtons()
        {
            if (EnableCompr_checkBox.CheckState == CheckState.Unchecked)
            {
                HighRB.Enabled = false;
                MediumRB.Enabled = false;
                LowRB.Enabled = false;
                HighRB.Visible = false;
                MediumRB.Visible = false;
                LowRB.Visible = false;
                DefaultRB.Enabled = false;
                DefaultRB.Visible = false;
                NoneRB.Enabled = false;
                NoneRB.Visible = false;
            }
            if (EnableCompr_checkBox.Checked && FileTransfer.FileType == null)
            {
                MessageBox.Show("Please select a FileType.\nAssociated Compression techniques available will be shown.");
                EnableCompr_checkBox.CheckState = CheckState.Unchecked;
            }

            if (EnableCompr_checkBox.Checked && FileTransfer.FileType == "Text" && LoginAuthenticator.registered)
            {
                DefaultRB.Enabled = true;
                DefaultRB.Visible = true;
                NoneRB.Visible = true;
                NoneRB.Enabled = true;
                HighRB.Enabled = false;
                MediumRB.Enabled = false;
                LowRB.Enabled = false;
                HighRB.Visible = false;
                MediumRB.Visible = false;
                LowRB.Visible = false;

                ComprMsgLabel.Text = "Chosen Compression technique : Default";
            }
            else if (EnableCompr_checkBox.Checked && FileTransfer.FileType == "Text" && !LoginAuthenticator.registered)
            {
                HighRB.Enabled = false;
                MediumRB.Enabled = false;
                LowRB.Enabled = false;
                HighRB.Visible = false;
                MediumRB.Visible = false;
                LowRB.Visible = false;
                NoneRB.Visible = false;
                DefaultRB.Visible = false;

                ComprMsgLabel.Text = "Chosen Compression technique : Default";
            }
            else if (EnableCompr_checkBox.Checked && FileTransfer.FileType == "Image" && LoginAuthenticator.registered)
            {
                DefaultRB.Enabled = true;
                DefaultRB.Visible = true;
                NoneRB.Visible = true;
                NoneRB.Enabled = true;
                HighRB.Enabled = true;
                MediumRB.Enabled = true;
                LowRB.Enabled = true;
                HighRB.Visible = true;
                MediumRB.Visible = true;
                LowRB.Visible = true;
                ChosenTech = "Default";
                ComprMsgLabel.Text = "Chosen Compression technique : Default";
            }
            else if (EnableCompr_checkBox.Checked && FileTransfer.FileType == "Image" && !LoginAuthenticator.registered)
            {
                HighRB.Enabled = false;
                MediumRB.Enabled = false;
                LowRB.Enabled = false;
                HighRB.Visible = false;
                MediumRB.Visible = false;
                LowRB.Visible = false;
                DefaultRB.Visible = false;
                NoneRB.Visible = false;
                DefaultRB.Enabled = false;
                NoneRB.Enabled = false;
                ChosenTech = "VLOW";
                ComprMsgLabel.Text = "Chosen Compression technique : " + ChosenTech;
            }

        }

        private void NoneRB_CheckedChanged(object sender, EventArgs e)
        {
            if (FileTransfer.FileType == "Text" && NoneRB.Checked == true)
            {
                ChosenTech = "None";
                DefaultRB.Checked = false;
            }
            else if (FileTransfer.FileType == "Image" && NoneRB.Checked == true)
            {
                ChosenTech = "None";
                DefaultRB.Checked = false;
                HighRB.Checked = false;
                LowRB.Checked = false;
                MediumRB.Checked = false;
            }
            else if (NoneRB.Checked == false)
            {
                ChosenTech = "Default";
            }

            ComprMsgLabel.Text = "Compression Technique chosen is :" + ChosenTech;
        }

        private void Logout_Label_Click(object sender, EventArgs e)
        {
            Connections.EndConnectionWithServer();

            Form1 newForm = new Form1();
            LoginAuthenticator.myCurrentUser = string.Empty;
            ChosenTech = string.Empty;
            FileTransfer.FileType = null;
            this.Hide();
            newForm.Show();
            MessageBox.Show("LogOut successful");
        }


        private void MediumRB_CheckedChanged(object sender, EventArgs e)
        {
            if (MediumRB.Checked == true)
            {
                ChosenTech = "MEDIUM";
                HighRB.Checked = false;
                LowRB.Checked = false;
                NoneRB.Checked = false;
            }
            else if (MediumRB.Checked == false)
            {
                ChosenTech = "Default";
            }

            ComprMsgLabel.Text = "Compression Technique chosen is :" + ChosenTech;
        }

        private void LowRB_CheckedChanged(object sender, EventArgs e)
        {
            if (LowRB.Checked == true)
            {
                ChosenTech = "LOW";
                HighRB.Checked = false;
                MediumRB.Checked = false;
                NoneRB.Checked = false;
            }
            else if (LowRB.Checked == false)
            {
                ChosenTech = "Default";
            }

            ComprMsgLabel.Text = "Compression Technique chosen is :" + ChosenTech;
        }

        private void HighRB_CheckedChanged(object sender, EventArgs e)
        {
            if (HighRB.Checked == true)
            {
                ChosenTech = "HIGH";
                LowRB.Checked = false;
                MediumRB.Checked = false;
                NoneRB.Checked = false;
            }
            else if (HighRB.Checked == false)
            {
                ChosenTech = "Default";
            }

            ComprMsgLabel.Text = "Compression Technique chosen is :" + ChosenTech;
        }

        private void statistics_button_Click(object sender, EventArgs e)
        {
            Form2 statForm = new Form2();
            statForm.fileType_label.Text = statForm.fileType_label.Text + FileTransfer.FileType;
            statForm.fnstat_label.Text = statForm.fnstat_label.Text + SelectedFile;
            statForm.ASize_label.Text = statForm.ASize_label.Text + " " + FileTransfer.actualSize + " bytes";
            statForm.recSize_label.Text = statForm.recSize_label.Text + " " + FileTransfer.recSize + " bytes";
            statForm.rtt_label.Text = statForm.rtt_label.Text + " " + watch.ElapsedMilliseconds + " ms";
            long percentage = ((FileTransfer.actualSize - FileTransfer.recSize) * 100) / FileTransfer.actualSize;
            statForm.BWsave.Text = statForm.BWsave.Text + " " + percentage + " %";
            statForm.Show();


            if (watch.ElapsedMilliseconds > 0)
            {
                MessageBox.Show("The time taken for the transaction is  : " + watch.ElapsedMilliseconds);
            }
            else
            {
                MessageBox.Show("The time taken for the transaction is  : 1000 ");
            }
        }


        private void Folder_Select_Button_Click(object sender, EventArgs e)
        {
            SaveFileDialog sd = new SaveFileDialog();
            sd.InitialDirectory = @"D:\FT\";
            sd.Filter = "Text files (*.txt)|*.txt|ImageFiles (*.jpg)|*.jpg | Audio Files (*.mp3)|*.mp3";

            sd.ShowDialog();
            if (!File.Exists(sd.FileName))
            {
                FileStream fs = File.Create(sd.FileName);
                fs.Close();
            }
            else
            {
                FileStream fd = File.Open(sd.FileName, FileMode.OpenOrCreate);
                fd.Close();
            }
            StoragePath = sd.FileName;
        }

        private void RegisterlinkLabel_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            Connections.EndConnectionWithServer();
            //MessageBox.Show("Please Enter the Registration Details. ");
            Register regForm = new Register();
            regForm.Show();
            this.Hide();
        }

        private void refresh_Click(object sender, EventArgs e)
        {
            if (FileTransfer.FileType == null)
            {
                MessageBox.Show("Select a File Type");
            }
            else
            {
                ViewFiles();
            }
        }

        private void Setting_Label_Click(object sender, EventArgs e)
        {
            Process myprocess = new Process();

            try
            {
                myprocess.StartInfo.UseShellExecute = true;
                myprocess.StartInfo.FileName = "http://" + HelperInfo.Default_Gateway + "//WANem";
                myprocess.Start();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

        private void FileName_textBox_TextChanged(object sender, EventArgs e)
        {

        }
    }
}
4

1 回答 1

1

尝试在表单构造函数中使用以下代码。

this.DoubleBuffered = true;

它应该会提高一些性能。Windows 窗体不会显示大量相互重叠的图像。

于 2013-06-10T17:38:46.950 回答