C# WinForm窗体如何在窗体加载时显示进度条???

Question

在打开子窗体时 访问不不访问数据库窗体打开都很慢，如何在打开时显示正在加载 不让用户感到死机

Answer 1

ajax，
或者用微软的ProgessBar

Answer 2

使用Progressbar（使用Marquee就先行了），异步加载数据，

Answer 3

多线程，使用BackgroundWorker组件的ProgressChanged事件推荐文章一篇

Answer 4

使用线程， 给你一个例子， 你研究一下。 把它的计算数列过程改成加载数据就行了。
//例： 计算Fibonacci数列，并实时滚动进度条
using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.ComponentModel;class FibonacciNumber : Form
{
    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.Run(new FibonacciNumber());
    }    private StatusStrip progressStatusStrip;
    private ToolStripProgressBar toolStripProgressBar;
    private NumericUpDown requestedCountControl;
    private Button goButton;
    private TextBox outputTextBox;
    private BackgroundWorker backgroundWorker;
    private ToolStripStatusLabel toolStripStatusLabel;
    private int requestedCount;    public FibonacciNumber()
    {
        Text = "Fibonacci";
       
        // Prepare the StatusStrip.
        progressStatusStrip = new StatusStrip();
        toolStripProgressBar = new ToolStripProgressBar();
        toolStripProgressBar.Enabled = false;
        toolStripStatusLabel = new ToolStripStatusLabel();
        progressStatusStrip.Items.Add(toolStripProgressBar);
        progressStatusStrip.Items.Add(toolStripStatusLabel);        FlowLayoutPanel flp = new FlowLayoutPanel();
        flp.Dock = DockStyle.Top;        Label beforeLabel = new Label();
        beforeLabel.Text = "Calculate the first ";
        beforeLabel.AutoSize = true;
        flp.Controls.Add(beforeLabel);
        requestedCountControl = new NumericUpDown();
        requestedCountControl.Maximum = 1000;
        requestedCountControl.Minimum = 1;
        requestedCountControl.Value = 100;
        flp.Controls.Add(requestedCountControl);
        Label afterLabel = new Label();
        afterLabel.Text = "Numbers in the Fibonacci sequence.";
        afterLabel.AutoSize = true;
        flp.Controls.Add(afterLabel);
       
        goButton = new Button();
        goButton.Text = "&Go";
        goButton.Click += new System.EventHandler(button1_Click);
        flp.Controls.Add(goButton);        outputTextBox = new TextBox();
        outputTextBox.Multiline = true;
        outputTextBox.ReadOnly = true;
        outputTextBox.ScrollBars = ScrollBars.Vertical;
        outputTextBox.Dock = DockStyle.Fill;        Controls.Add(outputTextBox);
        Controls.Add(progressStatusStrip);
        Controls.Add(flp);        backgroundWorker = new BackgroundWorker();
        backgroundWorker.WorkerReportsProgress = true;
        backgroundWorker.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);
        backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker1_RunWorkerCompleted);
        backgroundWorker.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);
       
    }    private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        // This method will run on a thread other than the UI thread.
        // Be sure not to manipulate any Windows Forms controls created
        // on the UI thread from this method.
        backgroundWorker.ReportProgress(0, "Working...");
        Decimal lastlast = 0;
        Decimal last = 1;
        Decimal current;
        if (requestedCount >= 1)
        { AppendNumber(0); }
        if (requestedCount >= 2)
        { AppendNumber(1); }
        for (int i = 2; i < requestedCount; ++i)
        {
            // Calculate the number.
            checked { current = lastlast + last; }
            // Introduce some delay to simulate a more complicated calculation.
            System.Threading.Thread.Sleep(100);
            AppendNumber(current);
            backgroundWorker.ReportProgress((100 * i) / requestedCount, "Working...");
            // Get ready for the next iteration.
            lastlast = last;
            last = current;
        }
        backgroundWorker.ReportProgress(100, "Complete!");
    }    private delegate void AppendNumberDelegate(Decimal number);
    private void AppendNumber(Decimal number)
    {
        if (outputTextBox.InvokeRequired)
        { outputTextBox.Invoke(new AppendNumberDelegate(AppendNumber), number); }
        else
        { outputTextBox.AppendText(number.ToString("N0") + Environment.NewLine); }
    }
    private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        toolStripProgressBar.Value = e.ProgressPercentage;
        toolStripStatusLabel.Text = e.UserState as String;
    }    private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        if (e.Error is OverflowException)
        { outputTextBox.AppendText(Environment.NewLine + "**OVERFLOW ERROR, number is too large to be represented by the decimal data type**"); }
        toolStripProgressBar.Enabled = false;
        requestedCountControl.Enabled = true;
        goButton.Enabled = true;    }    private void button1_Click(object sender, EventArgs e)
    {
        goButton.Enabled = false;
        toolStripProgressBar.Enabled = true;
        requestedCount = (int)requestedCountControl.Value;
        requestedCountControl.Enabled = false;
        outputTextBox.Clear();
        backgroundWorker.RunWorkerAsync();
    }
} 

Answer 5

c# winform下页可以用Ajax？

Answer 6

.net有自带的这中加载窗体前的启动功能，叫做创建启动屏幕（我是这么称呼它的）。
ApplicationContext基本上需要的东西覆盖了。