الاختبار وحدود الدليل

using System;
using System.Globalization;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;

int effects = 0;
RequestDelegate handler = context =>
{
    string? token = context.Request.Query["quantity"];
    if (!int.TryParse(token, NumberStyles.None, CultureInfo.InvariantCulture, out int value) || value is < 1 or > 10)
    { context.Response.StatusCode = 400; return Task.CompletedTask; }
    effects++;
    context.Response.StatusCode = 202;
    return Task.CompletedTask;
};
var context = new DefaultHttpContext();
context.Request.QueryString = new QueryString("?quantity=0");
await handler(context);
if (context.Response.StatusCode != 400 || effects != 0) throw new InvalidOperationException("rejection contract failed");
Console.WriteLine($"status={context.Response.StatusCode} effects={effects}");

status=400 effects=0

يرفض المفوّض الصريح الصفر قبل زيادة عداد الأثر؛ ولا تعمل منظومة ربط أو قاعدة بيانات.

using System;
using System.Threading.Tasks;

var dependency = new FakeDependency();
int value;
using (dependency) { value = await dependency.ReadAsync(); }
if (value != 7 || !dependency.Completed || !dependency.Disposed) throw new InvalidOperationException("lifetime contract failed");
Console.WriteLine($"value={value} completed={dependency.Completed} disposed={dependency.Disposed}");

internal sealed class FakeDependency : IDisposable
{
    public bool Completed { get; private set; }
    public bool Disposed { get; private set; }
    public async Task<int> ReadAsync() { await Task.Yield(); if (Disposed) throw new ObjectDisposedException(nameof(FakeDependency)); Completed = true; return 7; }
    public void Dispose() => Disposed = true;
}

value=7 completed=True disposed=True

ينتهي البديل من قراءة 7 قبل التخلص، وتتحقق التأكيدات من علمي دورة الحياة معا.