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MinLength attribute considers the value as valid if it's null. Therefore just initialize your property in the model as an empty array and it'll work. MinLength(1, ErrorMessageResourceName = nameof(ValidationErrors.AtLeastOneSelected), ErrorMessageResourceType = typeof(ValidationErrors))] int[] SelectedLanguages { get; set; } = new int[0];
27 Μαρ 2013 · Code contracts include classes for marking your code, a static analyzer for compile-time analysis, and a runtime analyzer. At least you'll get the warning from static analyzer. And you can turn off runtime analysis in Release mode to avoid performance hit.
3 Νοε 2023 · You can validate syntax against an earlier version of C#, or because your project must support older libraries or runtimes. There are two possible causes and three ways to address these errors and warnings.
Common C# Programming Mistake #1: Using a reference like a value or vice versa. Programmers of C++, and many other languages, are accustomed to being in control of whether the values they assign to variables are simply values or are references to existing objects.
17 Οκτ 2017 · The main type is the Validator<T> that allows me to define a collection of rules and their string representation for debugging purposes. It also provides a default rule that checks if the object is not null. public class Validator<T> { private readonly IEnumerable<ValidationRule<T>> _rules; public Validator (IEnumerable<ValidationRule<T>> ...
20 Ιουν 2024 · The regular expression ^[0-9A-Z]([-.\w]*[0-9A-Z])*$ is written to process what is considered to be a valid email address. A valid email address consists of an alphanumeric character, followed by zero or more characters that can be alphanumeric, periods, or hyphens.
8 Μαρ 2023 · The simplest C# expressions are literals (for example, integer and real numbers) and names of variables. You can combine them into complex expressions by using operators. Operator precedence and associativity determine the order in which the operations in an expression are performed.
