How Can I Validate Integer Input from the Console in C#?

Input Validation for Integer Constraints

In the realm of programming, handling console input is often essential. However, when dealing with user input, ensuring it conforms to specific constraints is crucial. One such constraint is restricting input to integers only. This article addresses the task of validating console input as integers, preventing the entry of alphabetical characters.

To achieve input validation, modify the code as follows:

string line = Console.ReadLine();
int value;
if (int.TryParse(line, out value))
{
    // this is an int
    // perform minimum number check here
}
else
{
    // this is not an int
    // handle invalid input
}

In this code, Console.ReadLine() reads user input and stores it as a string in the line variable. We then employ int.TryParse to determine if the string represents a valid integer. If the conversion succeeds, the value variable holds the integer. In cases where the user enters an invalid non-integer value, the else block is executed, allowing you to handle such input appropriately.

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