decimal.TryParse() drops leading “1”

Question

Short and sweet version:

On one machine out of around a hundred test machines decimal.TryParse() is converting \"1.01\" to 0.01

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Okay, this is going to soun

Answer 1

I am able to reproduce your results. Consider:

public NumberFormatInfo OneIsPositiveSignFormat()
{
    NumberFormatInfo custom = new NumberFormatInfo();
    custom.PositiveSign = "1";
    return custom;
}

And then:

if (decimal.TryParse(value, NumberStyles.Number, OneIsPositiveSignFormat(), out val))

The thing is: Regional Settings does not show you the current positive sign, and mainly: you did not set the culture when parsing the number.

The value may come from various locations: It may have come from the registry as the system defaults, or the defaults could have been set by code:

CultureInfo customCulture = (CultureInfo)CultureInfo.InvariantCulture.Clone();
customCulture.NumberFormat = OneIsPositiveSignFormat();
Thread.CurrentThread.CurrentCulture = customCulture;