Professional IronPython

Building the Code
You can see that the form in Figure 18-3 has three 
Button
controls in it. Each of the controls has a 
Click()
event handler 
associated with it, as shown in Listing 18-3.
LISTINg 18-3: 
 Defining an application to test
private void btnQuit_Click(object sender, EventArgs e)
{
Close();
}
public void btnAdd_Click(object sender, EventArgs e)
{
txtResult.Text = (Int32.Parse(txtValue1.Text) + 
Int32.Parse(txtValue2.Text)).ToString();
}
public void btnSubtract_Click(object sender, EventArgs e)
{
txtResult.Text = (Int32.Parse(txtValue1.Text) - 
Int32.Parse(txtValue2.Text)).ToString();
}
The 
btnQuit_Click()
event handler is as you might expect. It simply closes the form using the 
Close()
method. You won’t test this functionality using the IronPython script.
The 
btnAdd_Click()
event handler converts the values of 
txtValue1.Text
and 
txtValue2.Text
to 
Int32
values using 
Int32.Parse()
. It then adds the numbers together, converts the result to a 
string using 
ToString()
, and places it into 
txtResult.Text
. Because IronPython needs to test this 
event handler, the visibility is set to 
public
. If you don’t change the visibility of the event handler, 
IronPython won’t be able to access it. The 
btnSubtract_Click()
event handler works the same as 
the 
btnAdd_Click()
event handler, except that it subtracts the two numbers.
fIgURE 18-3: 
The simple form used 
for this example provides enough 
inputs to test.
548592c18.indd 398
2/24/10 12:49:46 PM
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Testing Applications