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Is there an Int.isWholeNumber () function or something similar?

I need to check if the input is int or not. Is there a similar function for String.IsNullOrEmpty (), like the Int.isWholeNumber () function?

Is there a way to check this inside a statement if()without having the right to declare an int earlier? (How do you need to do with TryParse ())

EDIT
I need to check the area code (five numbers)

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8 answers

I do not believe that there is such a method in BCL, but it is easy to write (I assume that you are really talking about whether a string can be parsed as an integer):

public static bool CanParse(string text)
{
    int ignored;
    return int.TryParse(text, out ignored);
}

, IFormatProvider .., . , , , ...

, Fluent Validation.

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:

bool isNumber = "-1990".IsNumber();

:

public static class NumberStringExtension
{

    public static bool IsNumber(this string value)
    {
        int i = 0;
        return int.TryParse(value, out i));
    }

}
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Int.TryParse .

function bool IsNumber(object number)
{
  try
  {
    Convert.ToInt32(number.ToString());
    return true;
  }
  catch
  {
   return false;
  }
}
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, int.TryParse , , . ( , - "1." .)

string input;
int ignored;

bool wholeNumber = int.TryParse(input, out ignored) && input.indexOf('.') == -1;
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Int types must be integers by definition. It must be a double, float, or decimal type for a non-integer. You can always try to check the input type.

Or maybe the input is a string? If the input is a string, you can try a search. or ',' (depending on the culture). Or you can try parsing as an integer.

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Since each int is an integer, this is easy:

public static bool IsWholeNumber(int i)
{
    return true;
}
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If you just want to check it in the if statement, you can just do

If ( val % 1 > 0)
  //not whole number
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