private void btnConvert_Click(object sender, EventArgs e)
{
double valueFromTextBox;
try
{
if (String.IsNullOrEmpty(textBoxValue.Text))
{
throw new Exception("Field cannot be empty!");
}
labelError.Text = "";
Double.TryParse(textBoxValue.Text, out valueFromTextBox);
_lengthConverter.SetLength(Double.Parse(textBoxValue.Text));
if (comboBoxConvertFrom.SelectedItem == null || comboBoxConvertTo.SelectedItem == null)
{
throw new ArgumentNullException(null, "Pick a unit!");
}
labelResult.Text = Math.Round(
_lengthConverter.HandleConverter(
comboBoxConvertFrom.SelectedItem.ToString(), comboBoxConvertTo.SelectedItem.ToString()), 2).ToString();
}
catch (ArgumentNullException ex)
{
labelError.Text = ex.Message;
}
catch (Exception ex)
{
labelError.Text = ex.Message;
}
}
public void TestKilometersToMeters()
{
var lengthConverter = new LengthConverter();
lengthConverter.SetLength(12.5);
Assert.AreEqual(12500.0, lengthConverter.KilometersToMeters());
}
public void TestCentimetersToKilometers()
{
var lengthConverter = new LengthConverter();
lengthConverter.SetLength(54433.33);
Assert.AreEqual(0.5443333, lengthConverter.CentimetersToKilometers());
}
public void TestCenimetersToMilimeters()
{
var lengthConverter = new LengthConverter();
lengthConverter.SetLength(11.1);
Assert.AreEqual(111.0, lengthConverter.CentimetersToMilimeters());
}
public void TestMilimetersToKilometers()
{
var lengthConverter = new LengthConverter();
lengthConverter.SetLength(1200.0);
Assert.AreEqual(0.0012, lengthConverter.MilimetersToKilometers());
}
public void TestMilimetersToCentimeters()
{
var lengthConverter = new LengthConverter();
lengthConverter.SetLength(120.0);
Assert.AreEqual(12.0, lengthConverter.MilimetersToCentimeters());
}
public FormLength()
{
InitializeComponent();
AddUnitsToComboBox(comboBoxConvertFrom);
AddUnitsToComboBox(comboBoxConvertTo);
_lengthConverter = new LengthConverter();
_lengthConverter.SetLength(0);
textBoxValue.Text = "0";
}
public void TestCentimetersToMeters()
{
var lengthConverter = new LengthConverter();
lengthConverter.SetLength(321);
var result = lengthConverter.CentimetersToMeters();
Assert.AreEqual(3.21, result);
}
