轨迹栏中的最大值

Question

我有一个按钮可以将 +100 添加到轨迹栏。最大值43000，如果值在43000点击按钮会报错

Value '43001' is not valid for 'Value'. 'Value' must be between 'Minimum' and 'Maximum'.

private void button41_Click(object sender, EventArgs e)     
{
    trackBar1.Value = trackBar1.Value += 100;      
    label27.Text = "" + trackBar1.Value; 
}

Issue resolved:

  public Form1()
        {
            me = this;
            InitializeComponent();
            trackBar1.Maximum = 43000;
            trackBar1.Minimum = 40;


        }

按钮

private void button41_Click(object sender, EventArgs e)
{
    if (trackBar1.Value + 100 <= trackBar1.Maximum)
    {
         trackBar1.Value = trackBar1.Value += 100;
        label27.Text = "Frequency = " + trackBar1.Value;
    }
    else
    {
        MessageBox.Show("Max value = " + trackBar1.Maximum);
    }
}

42990 + 100 without errors if I click add

Message displayed when trying add more than the supported value

Answer 1

消息已经说明了一切：该值不能大于最大值。

只需在增加值之前添加一个条件：

if (trackBar1.Value < trackBar1.Maximum)
    trackBar1.Value++;

或者在这里你完整的事件处理程序：

private void button41_Click(object sender, EventArgs e)
{
    if (trackBar1.Value < trackBar1.Maximum)
    {
        trackBar1.Value++;
        label27.Text = trackBar1.Value;
    }
    else
    {
        MessageBox.Show("Max value = " + trackBar1.Maximum);
    }
}

轨迹栏中的最大值

Maximum value in the track bar

c#

button

trackbar