我在C#中制作了一个带有两个文本框和按钮的复杂计算器。我想只用键盘操作计算器。我在textbox1_Keypress，textbox2_Keypress和Form_Keypress中添加了相同的代码。
Form_keypress中也使用了相同的代码，但只要我不在文本框中，代码就无法使用。关于如何在任何时间立即为键盘做出表单响应的任何建议，无论焦点在哪里？
private void textBox1_TextChanged(object sender, EventArgs e)
{
if (textBox1.Text != "")
{
double d;
if (flag == 1)
{
Double.TryParse(textBox1.Text, out d);
getOperand.Real = d;
}
else if (flag == 2)
{
Double.TryParse(textBox1.Text, out d);
getOperand.Magnitude = d;
}
}
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
if (textBox2.Text != "")
{
double d;
if (flag == 1)
{
Double.TryParse(textBox2.Text, out d);
getOperand.Imag = d;
}
else if (flag == 2)
{
Double.TryParse(textBox2.Text, out d);
getOperand.Angle = d;
}
}
}
private void textBox2_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == '+')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 1;
}
else if (e.KeyChar == '-')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 2;
}
else if (e.KeyChar == '*')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 3;
}
else if (e.KeyChar == '/')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 4;
}
else if (e.KeyChar == '=')
{
operand2.Real = getOperand.Real;
operand2.Imag = getOperand.Imag;
switch (flag1)
{
case 1:
operand1 = operand1 + operand2;
break;
case 2: operand1 = operand1 - operand2;
break;
case 3:
operand1 = operand1 * operand2;
break;
case 4:
operand1 = operand1 / operand2;
break;
}
if (flag == 1)
{
textBox1.Text = string.Format("{0:F2}", operand1.Real.ToString());
textBox2.Text = string.Format("{0:F2}", operand1.Imag.ToString());
}
else if (flag == 2)
{
textBox1.Text = string.Format("{0:F2}", operand1.Magnitude.ToString());
textBox2.Text = string.Format("{0:F2}", operand1.Angle.ToString());
}
// MessageBox.Show(string.Format("{0:D2}", operand1.Real.ToString()));
// MessageBox.Show(string.Format("{0:D2}", operand1.Imag.ToString()));
listBox1.Items.Add(operand1);
}
}
private void Form1_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == '+')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 1;
}
else if (e.KeyChar == '-')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 2;
}
else if (e.KeyChar == '*')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 3;
}
else if (e.KeyChar == '/')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 4;
}
else if (e.KeyChar == '=')
{
operand2.Real = getOperand.Real;
operand2.Imag = getOperand.Imag;
switch (flag1)
{
case 1:
operand1 = operand1 + operand2;
break;
case 2: operand1 = operand1 - operand2;
break;
case 3:
operand1 = operand1 * operand2;
break;
case 4:
operand1 = operand1 / operand2;
break;
}
if (flag == 1)
{
textBox1.Text = string.Format("{0:F2}", operand1.Real.ToString());
textBox2.Text = string.Format("{0:F2}", operand1.Imag.ToString());
}
else if (flag == 2)
{
textBox1.Text = string.Format("{0:F2}", operand1.Magnitude.ToString());
textBox2.Text = string.Format("{0:F2}", operand1.Angle.ToString());
}
// MessageBox.Show(string.Format("{0:D2}", operand1.Real.ToString()));
// MessageBox.Show(string.Format("{0:D2}", operand1.Imag.ToString()));
listBox1.Items.Add(operand1);
}
}
private void textBox2_KeyDown(object sender, KeyEventArgs e)
{
}
private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == '+')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 1;
}
else if (e.KeyChar == '-')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 2;
}
else if (e.KeyChar == '*')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 3;
}
else if (e.KeyChar == '/')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 4;
}
else if (e.KeyChar == '=')
{
operand2.Real = getOperand.Real;
operand2.Imag = getOperand.Imag;
switch (flag1)
{
case 1:
operand1 = operand1 + operand2;
break;
case 2: operand1 = operand1 - operand2;
break;
case 3:
operand1 = operand1 * operand2;
break;
case 4:
operand1 = operand1 / operand2;
break;
}
if (flag == 1)
{
textBox1.Text = string.Format("{0:F2}", operand1.Real.ToString());
textBox2.Text = string.Format("{0:F2}", operand1.Imag.ToString());
}
else if (flag == 2)
{
textBox1.Text = string.Format("{0:F2}", operand1.Magnitude.ToString());
textBox2.Text = string.Format("{0:F2}", operand1.Angle.ToString());
}
// MessageBox.Show(string.Format("{0:D2}", operand1.Real.ToString()));
// MessageBox.Show(string.Format("{0:D2}", operand1.Imag.ToString()));
listBox1.Items.Add(operand1);
}
}
}
答案 0 :(得分：0)
在KeyPress事件中，您必须将KeyPressEventArgs的Handled属性设置为true
避免通常的事件处理（即避免将'+'附加到TextBox）。
对于Form1_KeyPress方法，并不是很清楚“无法正常工作”的含义。我想发生的事情是代码永远不会被执行。这是因为KeyPress事件总是发送到表单上的一个控件（我猜你没有2个TextBox）。这意味着如果您想在焦点所在的位置进行相同的操作，则必须注册表单上每个控件的KeyPress事件。
顺便说一下，我只重构一个处理KeyPress的方法重构代码，当你需要根据获得输入的Control做一些稍微不同的事情时检查发送者对象。