How Can I Check if a String Represents a Number in C#?

Identify the number string

In many programming scenarios, determining whether the string represents the ability to represent numbers is very important. String such as "123" should be identified as numbers, while string such as "ABC" or "AB2" should not be recognized as numbers.

Isnumeric () function

In C#, there is no clear isnumeric ()

function to check whether the string is numbers. However, the

TryParse () method in the int class can effectively achieve this goal. Use TryParse ()

Tryparse ()

Try to convert the string to an integer. If the conversion is successful, it returns True, indicating that the string is an effective number. Otherwise, return false. Example is as follows:

In this code, TryParse ()

Try to analyze the string "123" as an integer. If it is successful, the value of n

will be set to 123, and

isnumeric

<code class="language-csharp">int n;
bool isNumeric = int.TryParse("123", out n);</code>

will be set to true.

C# 7 and the higher version update In C# 7 and higher versions, you can omit OUT Parameter:

or, if there is no need to analyze the value:

Note: Here VAR

The keywords can be replaced with a specific data type, such as

<code class="language-csharp">var isNumeric = int.TryParse("123", out int n);</code>

Bool

.

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