public void GetImplementationType_ThrowsForNoImplementationType()
{
// Arrange
var serviceType = typeof(IFakeService);
var collection = new ServiceCollection();
var descriptor = new ServiceDescriptor(serviceType, null);
// Act & Assert
ExceptionAssert.ThrowsArgument(
() => descriptor.GetImplementationType(),
null,
AbstractionResources.FormatNoImplementation(serviceType));
}
/// <summary>
/// Adds a <see cref="ServiceDescriptor"/> if an existing descriptor with the same
/// <see cref="ServiceDescriptor.ServiceType"/> and an implementation that does not already exist
/// in <paramref name="services."/>.
/// </summary>
/// <param name="services">The <see cref="IServiceCollection"/>.</param>
/// <param name="descriptor">The <see cref="ServiceDescriptor"/>.</param>
/// </param>
/// <remarks>
/// Use <see cref="TryAddEnumerable"/> when registing a service implementation of a service type that
/// supports multiple registrations of the same service type. Using
/// <see cref="Add(IServiceCollection, ServiceDescriptor)"/> is not idempotent and can add duplicate
/// <see cref="ServiceDescriptor"/> instances if called twice. Using
/// <see cref="TryAddEnumerable(IServiceCollection, ServiceDescriptor)"/> will prevent registration
/// of multiple implementation types.
/// </remarks>
public static void TryAddEnumerable(
[NotNull] this IServiceCollection services,
[NotNull] ServiceDescriptor descriptor)
{
var implementationType = descriptor.GetImplementationType();
if (implementationType == typeof(object) ||
implementationType == descriptor.ServiceType)
{
throw new ArgumentException(
Resources.FormatTryAddIndistinguishableTypeToEnumerable(
implementationType,
descriptor.ServiceType),
nameof(descriptor));
}
if (!services.Any(d =>
d.ServiceType == descriptor.ServiceType &&
d.GetImplementationType() == implementationType))
{
services.Add(descriptor);
}
}
public void GetImplementationType_ThrowsForNoImplementationType()
{
// Arrange
var serviceType = typeof(IFakeService);
var collection = new ServiceCollection();
var descriptor = new ServiceDescriptor(serviceType, null);
// Act & Assert
ExceptionAssert.ThrowsArgument(
() => descriptor.GetImplementationType(),
null,
AbstractionResources.FormatNoImplementation(serviceType));
}
