Événement KeyPress équivalent dans WPF

j'ai le code suivant dans le WPA, et je suis en train de le convertir en WPF. J'ai essayé Keydown au lieu de Keypress et changé, par exemple,

(e.keyChar == '-') to (e.key == e.Subtract):

1. sa ne fonctionne pas de la même
2. Je ne peux pas trouver le signe égal dans les e.clé

premier code:

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);
}
}

deuxième code:

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);
}
}