修复 WinForms 中的进度条

Question

问题是标签在 progress-bar 完成之前显示。如何让label只在progress-bar完全完成后才显示？

我尝试将最大值更改为更高的数值，但没有用。

public partial class dload : Form
{
    public dload()
    {
        InitializeComponent();
    }

    private void dload_Load(object sender, EventArgs e)
    {
        label1.Visible = false;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        int i = 0;
        progressBar1.Minimum = 0;
        progressBar1.Maximum = 5000;
        for (i = 0; i <= 5000; i++)
        {
            progressBar1.Value = i;
            if (i == 5000)
            {
                label1.Visible = true;
            }
        }
    }
}

Answer 1

这是一个动画问题。周围一个"hack"其实就是把进度值减1:

progressBar1.Minimum = 0;
progressBar1.Maximum = 5000;
for (int i = 0; i < progressBar1.Maximum; i++) {
  progressBar1.Value = i;
  progressBar1.Value = Math.Max(i - 1, progressBar1.Minimum);
}
label1.Visible = true;

Answer 2

使用progressBar1.Refresh:

public partial class dload : Form
{
    public dload()
    {
        InitializeComponent();
    }

private void dload_Load(object sender, EventArgs e)
{
    label1.Visible = false;
}

private void button1_Click(object sender, EventArgs e)
{
    int i = 0;
    progressBar1.Minimum = 0;
    progressBar1.Maximum = 5000;
    for (i = 0; i <= 5000; i++)
    {
        progressBar1.Value = i;
        progressBar1.Refresh();
        if (i == 5000)
        {
            label1.Visible = true;
        }
    }
}

Answer 3

实际上，您的代码运行非常庞大，将值从 0% 设置为 100% 大约不到一秒钟！但 ProgressBar 有两种显示当前状态的样式（Classic 和 Continues）。

在Continues模式下，如果进度值从0%到100%，控件会显示动画，这不是显示真实准确的进度。您可以通过 Thread.Sleep() 设置延迟并在 for 循环后立即显示您的标签以了解我发生了什么！

下面的代码可以工作：

private void button1_Click(object sender, EventArgs e)
{
    int i = 0;
    progressBar1.Minimum = 0;
    progressBar1.Maximum = 5000;
    for (i = 0; i <= 5000; i++)
    {
        Thread.Sleep(1);
        progressBar1.Value = i;

    }
    label1.Visible = true;
}

修复 WinForms 中的进度条

fix progress bar in WinForms

c#

winforms

progress-bar