CODEWITHSUNDEEP
c#
user1618825
user1618825

Reputation:

Integer Check with Ternary

How to check for integer in one line?

sample.AddRange(Statistics.Select(player => new Stats
                       {
                         SeasonFromYear = Convert.ToInt32(seasonFromYear)
                       }

This one is working for me. 

int a;
SeasonFromYear = int.TryParse(seasonFromYear, out a) ? a : default(int);

But for every property i need to declare one variable like a. Without that is it possible to check in one line?

Something like this

 sample.AddRange(Statistics.Select(player => new Stats
                       {
                         SeasonFromYear = is integer ? then value : else default value 
                       }

Upvotes: 10

Views: 4809

Answers (5)

Stuart
Stuart

Reputation: 119

I know this is old but for one line just declare a in the TryParse:

SeasonFromYear = int.TryParse(seasonFromYear, out int a) ? a : default(int);

Put whatever default value you want where default(int) is.

Upvotes: 1

Vano Maisuradze
Vano Maisuradze

Reputation: 5899

You can create extension method:

public static int ToInt(this string v)
{
    int a = 0;
    int.TryParse(v, out a);
    return a;
}

And then:

int number = "123".ToInt();

Edit

Or you can pass integer as out parameter:

public static bool ToInt(this string v, out int a)
{
    return int.TryParse(v, out a);  
}

usage:

int number = 0;
"123".ToInt(out number);

Upvotes: 7

Joe Brunscheon
Joe Brunscheon

Reputation: 1989

Have you tried using a safe cast and doing a null-coalescing check in a single line?

SeasonFromYear = seasonFromYear as int ?? default(int);

Upvotes: 1

Pawel
Pawel

Reputation: 31610

Try:

int.TryParse(sessionFromYear, out SessionFromYear)

If SessionFromYear can be a property just create a method that will do what you need to do - e.g.:

public int ParseInt(string input)
{
    int value;
    int.TryParse(input, out value);

    return value;
}

and then you can use this method all over the place like this:

SessionFromYear = ParseInt(sessionFromYear);

if you want to make it really fancy you could even create an extension method on the string class and then just do something like sessionFromYear.ToInt()

Upvotes: 1

p.s.w.g
p.s.w.g

Reputation: 149000

That's not necessary. If int.TryParse fails, a will be set to default(int). Just use:

int a;
int.TryParse(sessionFromYear, out a);
SeasonFromYear = a;

Or if you really want to do it in one line, you'd have to create you're own wrapper method:

public static int TryParseInline(string in) {
    int a;
    int.TryParse(sessionFromYear, out a);
    return a;
}

...

sample.AddRange(Statistics.Select(player => new Stats
{
    SeasonFromYear = Util.TryParseInline(seasonFromYear),
    ...
})

Upvotes: 4

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