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How validation can be done Fully-Coolly
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| public class Program | |
| { | |
| public static async Task Main() | |
| { | |
| var results = Validate.If(() => "a" == "a") | |
| //optional then branch | |
| .Then(()=> | |
| { | |
| Console.WriteLine("a equals a, so Then was executed"); | |
| //some code | |
| return Validate.If(() => "b" != "b") | |
| .WithMessage("b not equals b"); | |
| }) | |
| //optional else branch | |
| .Else(ElseBranch) | |
| .WithMessage("a not equals a") | |
| //optional as warning | |
| .AsWarning(); | |
| //as multiple errors | |
| Console.WriteLine(string.Join(";", results.Select(x=> $"{x.Type}:{x.Message}"))); | |
| //as single error (implicit cast) | |
| ValidationResult vr = results; | |
| Console.WriteLine($"{vr.Type}:{vr.Message}"); | |
| } | |
| private static IEnumerable<ValidationResult> ElseBranch() | |
| { | |
| Console.WriteLine("a not equals a, so Else was executed"); | |
| for (int i = 0; i < 10; i++) | |
| { | |
| yield return Validate.If(() => "c" == "c") | |
| .WithMessage("c not equals c"); | |
| } | |
| } | |
| } | |
| //###########OUTPUT########### | |
| //a equals a, so Then was executed | |
| //Error:b not equals b | |
| //a equals a, so Then was executed | |
| //Error:b not equals b |
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