C# ToolStripProgressBar

C# ToolStripPRogressBar

ToolStripProgressBar 将所有 ToolStrip控件的移动和渲染功能和其典型的进程跟踪功能结合在一起。ToolStripProgressBar通常放在StatusStrip中，偶尔放在ToolStrip中。

ToolStripProgressBar通常在执行复制文件或打印文件等任务时使用，由于执行任务的时间较长，如果没有视觉提示，用户可能会任务应用程序没有响应。

ToolStripProgressBar的重要成员如下：

Maximum和Minimum属性用于表示任务进度的最大和最小值。Minimum通常设置为0，Maximum通常为任务完成时的值。 例如，若要正确显示复制一组文件的进度，Maximum可以设置为需要复制的文件个数。Value属性表示当前的进度。

除了直接修改Value属性之外，还有许多方法可以修改由ToolStripProgressBar显示的值，如为Step属性指定Value每次递增的值，然后调用PerformStep使其递增。如果要修改递增的值，可以用Increment方法。

示例

下面的代码通过计算Fibonacci数列演示ToolStripProgressBar

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();    }}

界面如下：