传递double的Convert.ChangeType问题

Question

I am using this line of code to convert strings to int16 , int32 , double and other types:

var convertedValue = value == null ? null : Convert.ChangeType(value, targetType, CultureInfo.InvariantCulture);

Can anyone explain to me why convertedValue is set to eg 205.0 when value = "20,5" and targetType is double?

Thank you for your help.

Answer 1

Its a decimal separator. Like 20000 can be written in string as 20,000. Similarely when you convert 20,000 to double it will give you 20000.

Answer 2

I had similar problem in my VB.Net project. The reason of this was that compiler treated values with comma ( "20,5" ) like strings, because there is no decimal point for decimal value, therefore it convert "20,5" into 205 . I solved this issue by replacing comma with dot using

.ToString().Replace(",", ".")