CODEWITHSUNDEEP
c#
jacknad
jacknad

Reputation: 13739

How to use Split with TryParse?

I'd rather not throw an exception if the user enters one or more invalid doubles in a textbox. This is kind of what I'd like to do but it is wrong of course.

double myDouble[];
double.TryParse(textBox1.Text.Split(' '), out myDouble);

Upvotes: 2

Views: 5039

Answers (5)

Adriano Carneiro
Adriano Carneiro

Reputation: 58615

How about this (almost) one liner?

double dbl;
IEnumerable<double> doubles = 
    textBox1.Text.Split(' ')
                 .Select(str => Double.TryParse(str, out dbl) ? dbl : 0.0);

Gotta love one liners :)

Upvotes: 1

Tim Coker
Tim Coker

Reputation: 6524

If you just want the first value, you can do this, too.

double myDouble[];
double.TryParse(textBox1.Text.Split(' ')[0], out myDouble);

Upvotes: 1

Kostassoid
Kostassoid

Reputation: 1898

how about...

var myDoubleList = new List<double>();
foreach(var doubleString in textBox1.Text.Split(' '))
{
    double myDouble;
    if (double.TryParse(doubleString, out myDouble))
        myDoubleList.Add(myDouble);    
}

Upvotes: 4

driis
driis

Reputation: 164331

Split first, then parse each value. Perhaps like this:

string numbers = "10 20 30 40 50";
int x = 0;
var values = from str in numbers.Split(' ') 
             where int.TryParse(str, out x) 
             select x;

Upvotes: 2

BrokenGlass
BrokenGlass

Reputation: 160952

TryParse() is only trying to parse a single double value - you cannot use it with arrays. You could try and see if any number is invalid:

double myDouble;
bool parseFailed = textBox1.Text.Split(' ')
                           .Any( s => !double.TryParse(s, out myDouble));

Upvotes: 6

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