WinForms TextBox Get as Double or Integer

Tweet

I always end up returning to Windows Forms when I want to code some tool or prototype an idea. This time I just want to share two extension methods for retrieving the contents of a TextBox as an Integer or a Double.

public static double AsDouble(this TextBox textBox)
{
 var s = textBox.Text.Replace(",", ".").Trim();
 return double.TryParse(s, out var d) ? d : double.NaN;
}
public static int AsInt(this TextBox textBox)
{
 var s = textBox.Text.Trim();
 return int.TryParse(s, out var i) ? i : 0;
}

The colon to period replacement is to ensure that Swedish formatting works with the default parser. No guarantee that it will work with all cultures.


All code provided as-is. This is copied from my own code-base, May need some additional programming to work. Use for whatever you want, how you want! If you find this helpful, please leave a comment, not required but appreciated! :)

Hope this helps someone out there!

Asserting floating point values in unit tests

Tweet

Just a few methods to help out with unit testing, mainly for asserting floating point values (float, double) to be within a tolerance of the expected value

public static class Dessert
{
    public static void AreEqual(double expected, double actual, double tolerance)
    {
        Assert.IsTrue(expected.IsEqual(actual, tolerance),
            $"{Environment.NewLine}Dessert.AreEqual(double, double) failed. Expected:<{expected}>. Actual<{actual}>. Tolerance<{tolerance}>");
    }
        
    public static void AreEqual(float expected, float actual, float tolerance)
    {
        Assert.IsTrue(expected.IsEqual(actual, tolerance),
            $"{Environment.NewLine}Dessert.AreEqual(float, float) failed. Expected:<{expected}>. Actual<{actual}>. Tolerance<{tolerance}>");
    }
}

How to use:

Dessert.AreEqual(2700, weight, 0.000000000000001);

All code provided as-is. This is copied from my own code-base, May need some additional programming to work. Use for whatever you want, how you want! If you find this helpful, please leave a comment, not required but appreciated! :)

Hope this helps someone out there!

Distances to human readable text in C#

Tweet

Needed a function that converts a double to a human readable distance in my latest project, ended up writing the following function.
Input argument is in meters.
For values less than 1 meter, the result is given as centimeters.
For values up to 10 km, the values are given with one decimal.
Values up to one tenth of an Astronomical Unit are given as kilometers.
Values between one tenth of an Astronomical Unit and one tenth of a Parsec are given in Astronimical Units.
Values larger then one tenth of a Parsec are given in Parsecs.

Example output

Input	Output
0.533	53 cm
-1	-1 m
1	1 m
3,08568E+16	1.0 pc
3,08568E+17	10.0 pc
1,49598E+12	10.0 AU
1000	1.0 km
10000	10 km

The code for you to use as you please:

public const double AstronomicalUnit = 149597870700;
// https://en.wikipedia.org/wiki/Parsec
public static double Parsec { get; } = (648000 / Math.PI) * AstronomicalUnit;
public static string ToReadableDistanceFavorParsec(double meters, CultureInfo cultureInfo = null)
{
    if (cultureInfo == null)
        cultureInfo = CultureInfo.InvariantCulture;
    var sign = meters.Sign() > 0 ? string.Empty : "-";
    meters = meters.Abs();
    if (meters > (Parsec / 10))
    {
        return $"{sign}{(meters / Parsec).ToString("0.0", cultureInfo)} pc";
    }

    if (meters > (AstronomicalUnit / 10))
    {
        return $"{sign}{(meters / AstronomicalUnit).ToString("0.0", cultureInfo)} AU";
    }

    if (meters > (997))
    {

        if (meters >= (10000))
        {
            return $"{sign}{(meters / 1000).ToString("0", cultureInfo)} km";
        }
        return $"{sign}{(meters / 1000).ToString("0.0", cultureInfo)} km";
    }

    if (meters < 1)
    {
        return $"{sign}{meters * 100:0} cm";
    }
    return sign + meters.ToString("0") + " m";
}

All code provided as-is. This is copied from my own code-base, May need some additional programming to work. Use for whatever you want, how you want! If you find this helpful, please leave a comment, not required but appreciated! :)

Hope this helps someone out there!