CODEWITHSUNDEEP
c#stringparsingdecimal
Karolis Kajenas
Karolis Kajenas

Reputation: 1543

String with suffix fails parsing

When ever one passes string with suffix parsing to decimal fails.

decimal testValue;
decimal.TryParse("5M", NumberStyles.Number, CultureInfo.CurrentCulture, out testValue)

Following parse will return false.

Why does TryParse fail when you pass in a string with a suffix?

Upvotes: 5

Views: 417

Answers (2)

Soner Gönül
Soner Gönül

Reputation: 98810

Because there is no way to parse your string without removing M part. And none of NumberStyles have such a functionality.

I can suggest to Replace your M with empty string but that would be only solve for your case, it won't be a general solution.

decimal testValue;
decimal.TryParse("5M".Replace("M", ""), NumberStyles.Number, 
                                        CultureInfo.CurrentCulture, out testValue);

A real-type-suffix specifies number types. It teaches to C# compiler what a numeric literal type considered as. In a string, it means nothing. It is just an another character.

Upvotes: 0

Albireo
Albireo

Reputation: 11095

Because Decimal.TryParse does not support it.

Depending on the value of style, the s parameter may include the following elements:

[ws][$][sign][digits,]digits[.fractional-digits][e[sign]digits][ws]

Elements in square brackets ([ and ]) are optional. The following table describes each element.

ws: Optional white space. White space can appear at the beginning of s if style includes the NumberStyles.AllowLeadingWhite flag. It can appear at the end of s if style includes the NumberStyles.AllowTrailingWhite flag.

$: A culture-specific currency symbol. Its position in the string is defined by the NumberFormatInfo.CurrencyNegativePattern or NumberFormatInfo.CurrencyPositivePattern properties of the NumberFormatInfo object returned by the IFormatProvider.GetFormat method of the provider parameter. The currency symbol can appear in s if style includes the NumberStyles.AllowCurrencySymbol flag.

sign: An optional sign.

digits: A sequence of digits ranging from 0 to 9.

.: A culture-specific decimal point symbol.

fractional-digits: A sequence of digits ranging from 0 to 9.

Upvotes: 4

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