4-1. 通过滑块改变另一控件的值
private void numericUpDown1_ValueChanged(object sender, EventArgs e)
{
this.trackBar1.Value = (int)this.numericUpDown1.Value;
}
private void trackBar1_Scroll(object sender, EventArgs e)
{
this.numericUpDown1.Value = this.trackBar1.Value;
}
4-2. 通过控件hScrollBar形成控制条去控制窗体颜色。
private void hScrollBar1_Scroll(object sender, ScrollEventArgs e)
{
this.BackColor = Color.FromArgb(hScrollBar1.Value,hScrollBar2.Value,hScrollBar3.Value);
}
private void hScrollBar2_Scroll(object sender, ScrollEventArgs e)
{
this.BackColor = Color.FromArgb(hScrollBar1.Value, hScrollBar2.Value, hScrollBar3.Value);
}
private void hScrollBar3_Scroll(object sender, ScrollEventArgs e)
{
this.BackColor = Color.FromArgb(hScrollBar1.Value, hScrollBar2.Value, hScrollBar3.Value);
}
}
}
4-3.与第二题类似，只是第二题是横条，这个是竖条，控件用vScrollBar.
this.BackColor = Color.FromArgb(vScrollBar.Value, hScrollBar2.Value, hScrollBar3.Value);
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问题：
我想知道hScrollBar、vScrollBar 这两个控件是如何区分并实现对应颜色改变的？它改变颜色的代码都是相同的，是如何知道我要改变的是什么颜色，还是这两个控件只能改变这 三种颜色，且对应的顺序不可改变。
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4-4. 通过滑条改变前景色
private void hScrollBar1_Scroll(object sender, ScrollEventArgs e)
{
this.ForeColor = Color.FromArgb(hScrollBar1.Value, hScrollBar2.Value, hScrollBar3.Value);
}
private void hScrollBar2_Scroll(object sender, ScrollEventArgs e)
{
this.ForeColor = Color.FromArgb(hScrollBar1.Value, hScrollBar2.Value, hScrollBar3.Value);
}
private void hScrollBar3_Scroll(object sender, ScrollEventArgs e)
{
this.ForeColor = Color.FromArgb(hScrollBar1.Value, hScrollBar2.Value, hScrollBar3.Value);
}
4-5.与第四题类似。
this.ForeColor = Color.FromArgb(vScrollBar.Value, hScrollBar2.Value, hScrollBar3.Value);
4-6.通过滑块改变透明度，并且在进度条中显示透明进度。
private void trackBar1_ValueChanged(object sender, EventArgs e)
{
this.progressBar1.Value = (int)this.trackBar1.Value;
this.Opacity = 0.5 + (double)trackBar1.Value / 100;
}
运行结果：
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注意：
这里需要设置 trackBar的事件 ValueChanged为 trackBar1_ValueChanged，不然无法控制到progressBar1进度条的改变。
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4-7.
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
switch (this.comboBox1.SelectedIndex)
{
case 0: this.radioButton1.Checked = true; break;
case 1: this.radioButton2.Checked = true; break;
case 2: this.radioButton3.Checked = true; break;
}
}
private void radioButton1_CheckedChanged(object sender, EventArgs e)
{
if (this.radioButton1.Checked == true)
this.comboBox1.SelectedIndex = 0;
}
private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
if (this.radioButton2.Checked == true)
this.comboBox1.SelectedIndex = 1;
}
private void radioButton3_CheckedChanged(object sender, EventArgs e)
{
if (this.radioButton3.Checked == true)
this.comboBox1.SelectedIndex = 2;
}
}
运行结果：
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注意：
想要实现题目的要求，需要使用combox的事件Selectedindex，其作用是获取或设置指定当前选定项的索引。
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4-8
private void numericUpDown1_ValueChanged(object sender, EventArgs e)
{
if (numericUpDown1.Value == 1)
radioButton1.Checked = true;
if (numericUpDown1.Value == 2)
radioButton2.Checked = true;
if (numericUpDown1.Value == 3)
radioButton3.Checked = true;
}
private void radioButton1_CheckedChanged(object sender, EventArgs e)
{
if (radioButton1.Checked == true)
this.numericUpDown1.Value=1;
}
private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
if (radioButton2.Checked == true)
this.numericUpDown1.Value = 2;
}
private void radioButton3_CheckedChanged(object sender, EventArgs e)
{
if (radioButton3.Checked == true)
this.numericUpDown1.Value = 3;
}
运行结果：
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问题：
我这个虽然可以实现题目的要求，但是我总觉得我的numericUpDown数值改变事件没有处理对，求指导，我上网查了哈 还是不明白。
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4-9
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (checkBox1.Checked == false)
listBox1.Items.Remove("English");
if (checkBox1.Checked == true)
listBox1.Items.Add("English");
}
private void checkBox2_CheckedChanged(object sender, EventArgs e)
{
if (checkBox2.Checked == false)
listBox1.Items.Remove("German");
if (checkBox2.Checked == true)
listBox1.Items.Add("German");
}
private void checkBox3_CheckedChanged(object sender, EventArgs e)
{
if (checkBox3.Checked == false)
listBox1.Items.Remove("French");
if (checkBox1.Checked == true)
listBox1.Items.Add("French");
}
}
运行结果：
4-10
private void domainUpDown1_SelectedItemChanged(object sender, EventArgs e)
{
int n;
n = domainUpDown1.SelectedIndex;
listBox1.SelectedIndex=n;
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
int n;
n = listBox1.SelectedIndex;
domainUpDown1.SelectedIndex=n;
}
运行结果：
4-11
private void radioButton1_CheckedChanged(object sender, EventArgs e)
{
this.dateTimePicker1.Format = DateTimePickerFormat.Time;
}
private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
this.dateTimePicker1.Format = DateTimePickerFormat.Short;
}
private void radioButton3_CheckedChanged(object sender, EventArgs e)
{
this.dateTimePicker1.Format = DateTimePickerFormat.Long;
}
运行结果：
4-12
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (checkBox1.Checked == true)
this.monthCalendar1.ShowToday = true;
else
this.monthCalendar1.ShowToday = false;
}
private void checkBox2_CheckedChanged(object sender, EventArgs e)
{
if (checkBox2.Checked == true)
this.monthCalendar1.ShowTodayCircle = true;
else
this.monthCalendar1.ShowTodayCircle = false;
}
private void checkBox3_CheckedChanged(object sender, EventArgs e)
{
if (checkBox3.Checked == true)
this.monthCalendar1.ShowWeekNumbers = true;
else
this.monthCalendar1.ShowWeekNumbers = false;
}
运行结果：
4-13
private void timer1_Tick(object sender, EventArgs e)
{
if (progressBar1.Value == progressBar1.Maximum)
progressBar1.Value = 0;
else if (progressBar1.Value< progressBar1.Maximum)
progressBar1.Value = progressBar1.Value+progressBar1.Step;
if (progressBar2.Value== progressBar2.Maximum)
progressBar2.Value= 0;
else
progressBar2.Value = progressBar2.Value + progressBar2.Step;
}
运行结果：
4-14
private void timer1_Tick(object sender, EventArgs e)
{
if (progressBar1.Value == progressBar1.Maximum)
progressBar1.Value = 0;
else
progressBar1.Value = progressBar1.Value + progressBar1.Step;
}
private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
timer1.Interval = 500;
}
private void radioButton1_CheckedChanged(object sender, EventArgs e)
{
timer1.Interval = 100;
}
运行结果：
4-15
private void timer1_Tick(object sender, EventArgs e)
{
if (progressBar1.Value == progressBar1.Maximum)
progressBar1.Value = 0;
else
progressBar1.Value += progressBar1.Step;
}
private void button1_Click(object sender, EventArgs e)
{
timer1.Enabled = true;
button1.Enabled = false;
button2.Enabled = true;
}
private void button2_Click(object sender, EventArgs e)
{
timer1.Enabled = false;
button1.Enabled = true;
button2.Enabled = false;
}
运行结果：
4-16
private void timer1_Tick(object sender, EventArgs e)
{
if (trackBar1.Value == trackBar1.Maximum)
trackBar1.Value = 0;
else
trackBar1.Value++;
if (trackBar3.Value == trackBar3.Maximum)
trackBar3.Value = 0;
else
trackBar3.Value = trackBar3.Value + 5;
}
运行结果：
4-17
private void timer1_Tick(object sender, EventArgs e)
{
if (hScrollBar1.Value == hScrollBar1.Maximum)
hScrollBar1.Value = 0;
else
hScrollBar1.Value++;
if (hScrollBar2.Value == hScrollBar2.Maximum)
hScrollBar2.Value = 0;
else
hScrollBar2.Value = hScrollBar2.Value + 5;
}
运行结果：
4-18
与4-17类似，只是一个数横条，一个是竖条，使用vscrollbar ,其他语法相同。
4-19
private void timer1_Tick(object sender, EventArgs e)
{
dateTimePicker1.Value = dateTimePicker1.Value.AddSeconds(1);
}
private void button2_Click(object sender, EventArgs e)
{
button2.Enabled = false;
button1.Enabled = true;
timer1.Enabled = true;
}
private void button1_Click(object sender, EventArgs e)
{
button1.Enabled = false;
button2.Enabled = true;
timer1.Enabled = false;
}
运行结果：
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注意：
设置dateTimePicker数值加1不能直接使用dateTimePicker1.Value++；而是应该设置为dateTimePicker1.Value = dateTimePicker1.Value.AddSeconds(1);
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4-20
private void timer1_Tick(object sender, EventArgs e)
{
monthCalendar1.TodayDate=monthCalendar1.TodayDate.AddDays(1);
}
private void button1_Click(object sender, EventArgs e)
{
button1.Enabled = false;
timer1.Enabled = true;
button3.Enabled = true;
}
private void button3_Click(object sender, EventArgs e)
{
button1.Enabled = true;
timer1.Enabled = false;
button3.Enabled = false;
}
运行结果：
