Identify if a string is a number

c# string parsing isnumeric
Gold picture Gold · May 21, 2009 · Viewed 1.1M times · Source

If I have these strings:

  1. "abc" = false

  2. "123" = true

  3. "ab2" = false

Is there a command, like IsNumeric() or something else, that can identify if a string is a valid number?

Answer

mqp picture mqp · May 21, 2009 
int n;
bool isNumeric = int.TryParse("123", out n);

Update As of C# 7:

var isNumeric = int.TryParse("123", out int n);

or if you don't need the number you can discard the out parameter

var isNumeric = int.TryParse("123", out _);

The var s can be replaced by their respective types!

Related questions

Convert JSON String to JSON Object c#

I have this String stored in my database: str = "{ "context_name": { "lower_bound": "value", "upper_bound": "value", "values": [ "value1", "valueN" ] } }" This string is already in the JSON format but I want to convert it into a JObject or JSON Object. …

Read More
How do I parse a string with a decimal point to a double?

I want to parse a string like "3.5" to a double. However, double.Parse("3.5") yields 35 and double.Parse("3.5", System.Globalization.NumberStyles.AllowDecimalPoint) throws a FormatException. Now my computer's locale is set to German, wherein a comma is used as decimal separator. …

Read More
Parse string to DateTime in C#

I have date and time in a string formatted like that one: "2011-03-21 13:26" //year-month-day hour:minute How can I parse it to System.DateTime? I want to use functions like DateTime.Parse() or DateTime.ParseExact() if possible, to be …

Read More