使用C#windows窗体准备的GUI的颤抖效果

对于客户端和服务器系统之间的文件传输，我们在客户端系统上使用C#windows窗体设计了一个GUI。我们添加了许多背景图像和文本框，使GUI给人留下深刻印象。但是，每当我们执行客户机代码时，GUI都需要几秒钟来加载自己并保持稳定，然后才能从GUI中做出选择。这是在客户端GUI发出每个请求之后发生的（就像所有表单元素在短时间内消失并再次出现一样）。请帮忙。我可以知道原因吗

  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)
        {

        }
    }
}

---

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窗体不能显示大量相互重叠的图像。

显示从客户端代码更新窗体的代码。使用大量与窗口不完全匹配的背景图像或像素格式较差的背景图像以及大量文本框控件会使窗口的绘制变慢。你的表单为什么认为需要重新绘制完全不清楚。你一定是这样。因为我们包括了标签的背景图像以及文本框和组框。上面的解决方案似乎不起作用，但是谢谢。我知道这可能很难，但是如果你在这里发布你的代码，人们将能够更好地帮助你。目前没有人知道为什么代码要重新绘制整个表单元素。顺便说一句，在这种情况下，双缓冲区应该对您有所帮助，但在许多情况下，改进可能并不明显。我们有4个表格..登录、注册、主页和申请表格。由于请求表单的文本框、标签和组框数量最多，因此会出现此问题。我已经发布了代码。因为太长了，我最小化了类似的模块。希望找到解决办法。