[英]Double result when using keypress
我用C#制作了这个计算器,但遇到一个问题:当我按键盘上的数字1时,会给我错误的结果双精度数。 我没有得到正确的结果。
你知道我在做什么错吗
非常感谢你!
namespace Calculator
{
public partial class Calculator : Form
{
Double value = 0;
String operation = "";
int i = 0;
bool operation_pressed = false;
bool button_dot = false;
OperationClass class1 = new OperationClass();
public Calculator()
{
InitializeComponent();
this.KeyPreview = true;
this.KeyPress += new KeyPressEventHandler(Calculator_KeyPress);
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
}
private void Calculator_Load(object sender, EventArgs e)
{
}
private void Calculator_KeyPress(object sender, KeyPressEventArgs e)
{
if ((result.Text == "0") || (operation_pressed))
result.Clear();
switch (e.KeyChar)
{
// key press from 0-9
case (char)48:
case (char)49:
case (char)50:
case (char)51:
case (char)52:
case (char)53:
case (char)54:
case (char)55:
case (char)56:
case (char)57:
e.Handled = true;
result.Text += e.KeyChar.ToString();
break;
}
}
private void button_Click(object sender, EventArgs e)
{
if ((result.Text == "0") || (operation_pressed))
result.Clear();
operation_pressed = false;
Button b = (Button)sender;
result.Text = result.Text + b.Text;
}
private void operator_click(object sender, EventArgs e)
{
Button b = (Button)sender;
operation = b.Text;
value = Double.Parse(result.Text);
operation_pressed = true;
equation.Text = value + " " + operation;
}
private void buttonCE_Click(object sender, EventArgs e)
{
result.Text = "0";
equation.Text = "";
button_dot = false;
}
private void buttonC_Click(object sender, EventArgs e)
{
result.Clear();
value = 0;
}
private void buttonEqual_Click(object sender, EventArgs e)
{
equation.Text = "";
button_dot = false;
operation_pressed = true;
if (operation != "")
result.Text = class1.GetResult(operation, value, result.Text);
else
result.Text = result.Text + "";
}
private void buttonDot_Click(object sender, EventArgs e)
{
Button b = (Button)sender;
if ((!button_dot && !operation_pressed) || result.Text == "0")
result.Text = result.Text + b.Text;
button_dot = true;
}
}
}
我将其从按键更改为KeyUp。 这样,只有在释放钥匙后才会触发。
你不需要在你的追加keychar result.Text
(假设result
是你的TextBox
项目),你都写在一行result.Text += e.KeyChar.ToString();
。 那条线使您的输入加倍。
删除它,它将按预期工作。
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