WPF中的KeyPress事件等效项 [英] KeyPress event equivalent in WPF
本文介绍了WPF中的KeyPress事件等效项的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在WPA中具有以下代码，并且我正在尝试将其转换为WPF.我尝试使用Keydown而不是Keypress并进行了更改，例如
i have the following code in WPA, and i am trying to convert it to WPF. I tried Keydown instead of Keypress and changed, for example,
(e.keyChar == '-') to (e.key == e.Subtract):
- 其工作方式不同
- 我在e.key中找不到等号
第一个代码:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
foreach (TextBox tb in this.Controls.OfType<TextBox>())
{
tb.Enter += textBox_Enter;
}
}
void textBox_Enter(object sender, EventArgs e)
{
focusedTextbox = (TextBox)sender;
}
private void Form1_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == '+')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 1;
e.Handled = true;
}
else if (e.KeyChar == '-')
{
if (focusedTextbox != null)
{
if (focusedTextbox.Text == "")
{
e.Handled = false;
}
else
{
e.Handled = true;
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 2;
}
}
}
else if (e.KeyChar == '*')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 3;
e.Handled = true;
}
else if (e.KeyChar == '/')
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 4;
e.Handled = true;
}
else if (e.KeyChar == '=')
{
e.Handled = true;
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:
if (operand2.Magnitude == 0)
{
textBox1.Clear();
textBox2.Clear();
MessageBox.Show("Cannot divide by a number whose magnitude is zero");
operand1 = new Complex();
operand2 = new Complex();
listBox1.ClearSelected();
}
else
operand1 = operand1 / operand2;
break;
}
string s = operand1.ToString();
if (flag == 1)
{
string[] s1 = s.Split(' ');
if (s1[1] == "-")
{
textBox1.Text = s1[0];
textBox2.Text = "-" + s1[3];
}
else
{
textBox1.Text = s1[0];
textBox2.Text = s1[3];
}
}
else if (flag == 2)
{
string[] s1 = s.Split('@');
textBox1.Text = s1[0].Trim();
textBox2.Text = s1[1].Trim();
}
listBox1.Items.Add(operand1);
}
}
第二个代码:
private void win_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Add)
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 1;
e.Handled = true;
}
else if (e.Key == Key.Subtract)
{
if (textBox2.Text == "")
{
e.Handled = false;
}
else
{
e.Handled = true;
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 2;
}
}
else if (e.Key == Key.Multiply)
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 3;
e.Handled = true;
}
else if (e.Key == Key.Divide)
{
operand1.Real = getOperand.Real;
operand1.Imag = getOperand.Imag;
flag1 = 4;
e.Handled = true;
}
else if (e.Key == Key.Enter)
{
e.Handled = true;
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:
if (operand2.Magnitude == 0)
{
textBox1.Clear();
textBox2.Clear();
MessageBox.Show("Cannot divide by a number whose magnitude is zero");
operand1 = new Complex();
operand2 = new Complex();
listBox1.UnselectAll();
}
else
operand1 = operand1 / operand2;
break;
}
string s = operand1.ToString();
if (flag == 1)
{
string[] s1 = s.Split(' ');
if (s1[1] == "-")
{
textBox1.Text = s1[0];
textBox2.Text = "-" + s1[3];
}
else
{
textBox1.Text = s1[0];
textBox2.Text = s1[3];
}
}
else if (flag == 2)
{
string[] s1 = s.Split('@');
textBox1.Text = s1[0].Trim();
textBox2.Text = s1[1].Trim();
}
listBox1.Items.Add(operand1);
}
}
推荐答案
这非常相似-但是您将e.Key与Key枚举进行了比较.
It's very similar - but you compare e.Key to the Key enumeration.
在某个地方(例如构造函数或window_loaded)注册事件处理程序:
Register your event handler somewhere (such as the constructor, or window_loaded):
private void Window_Loaded(object sender, RoutedEventArgs e)
{
this.KeyDown += new KeyEventHandler(MainWindow_KeyDown);
}
然后在事件处理程序中:
And then in the event handler:
void MainWindow_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Subtract)
{
// Do something
}
}
这篇关于WPF中的KeyPress事件等效项的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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