C# Guard Pattern

This project contains guard clauses for object, string, int, double, decimal, datetime, datetimeoffset, timespan, URL.

Examples

Guard.Against.Null(name, "Name");
Guard.Against.NullOrEmpty(name, "Name");
Guard.Against.MinimumLength(name, "Name", 10);
Guard.Against.NumberLessThan(money, "Money", 1000);
Guard.Against.NumberGreaterThanOrEqual(money, "Money", 1000);
Guard.Against.NumberNegative(money, "Money");
Guard.Against.DateTimeGreaterThan(startDate, "StartDate", DateTime.Now);
Guard.Against.InValidURL("https://nilavpatel.github.io", "URL");

For generic <T> type

• Null

For String

• NullOrEmpty
• NullOrWhiteSpace
• LeadingAndTailingSpace
• MinimumLength
• MaximumLength
• SpecialCharacters
• Digits
• Alphabet
• LowerCase
• UpperCase
• Space

For int, double, decimal

• NumberLessThan
• NumberGreaterThan
• NumberLessThanOrEqual
• NumberGreaterThanOrEqual
• NumberZero
• NumberNegative
• NumberNegativeOrZero
• NumberOutOfRange

For DateTime

• DateTimeLessThan
• DateTimeGreaterThan
• DateTimeLessThanOrEqual
• DateTimeGreaterThanOrEqual
• DateTimeOutOfRange

For DateTimeOffset

• DateTimeOffsetLessThan
• DateTimeOffsetGreaterThan
• DateTimeOffsetLessThanOrEqual
• DateTimeOffsetGreaterThanOrEqual
• DateTimeOffsetOutOfRange

For TimeSpan

• TimeSpanLessThan
• TimeSpanGreaterThan
• TimeSpanLessThanOrEqual
• TimeSpanGreaterThanOrEqual
• TimeSpanOutOfRange

For Others

• InValidURL
• InValidEmailId
• InValidGuid

For bool

• True
• False

How to create custom guard clause?

public static class CustomGuardClause
{
    public static void MoreThanMaxLimit(this IGuardClause guardClause, int argument, string argumentName)
    {
        if (argument > Int16.MaxValue)
        {
            throw new ArgumentException(string.Format("{0} is not allowing to be more than Int16 max limit", argumentName));
        }
    }
}