/// <summary>
/// Gets the service of the specified <paramref name="serviceType"/>;
/// throws <see cref="InvalidOperationException"/>, if there is no such service.
/// </summary>
/// <param name="serviceProvider">The service provider to query for the service.</param>
/// <param name="serviceType">Type of the service to get.</param>
/// <param name="failIfNone">If set to <see langword="true"/>, an exception will be thrown
/// if there is no requested service.</param>
/// <returns>Requested service;
/// <see langword="null" />, if <paramref name="failIfNone"/>==<see langword="false" />
/// and there is no requested service.</returns>
/// <exception cref="InvalidOperationException">Thrown if <paramref name="failIfNone"/>==<see langword="true" />
/// and there is no requested service.</exception>
public static object GetService(this IHasServices serviceProvider, Type serviceType, bool failIfNone)
{
var getServiceInternal = DelegateHelper.CreateDelegate <Func <IHasServices, bool, object> >(
null, typeof(HasServicesExtensions), "GetServiceInternal", serviceType);
return(getServiceInternal(serviceProvider, failIfNone));
}
/// <summary>
/// Gets the service of specified type <typeparamref name="T"/>;
/// throws <see cref="InvalidOperationException"/>, if there is no such service.
/// </summary>
/// <typeparam name="T">The type of service to get.</typeparam>
/// <param name="serviceProvider">The service provider to query for the service.</param>
/// <param name="failIfNone">If set to <see langword="true"/>, an exception will be thrown
/// if there is no requested service.</param>
/// <returns>Requested service;
/// <see langword="null" />, if <paramref name="failIfNone"/>==<see langword="false" />
/// and there is no requested service.</returns>
/// <exception cref="InvalidOperationException">Thrown if <paramref name="failIfNone"/>==<see langword="true" />
/// and there is no requested service.</exception>
public static T GetService <T>(this IHasServices serviceProvider, bool failIfNone)
where T : class
{
ArgumentValidator.EnsureArgumentNotNull(serviceProvider, "serviceProvider");
var service = serviceProvider.GetService <T>();
if (failIfNone && service == null)
{
throw new InvalidOperationException(
string.Format(Strings.ExServiceNotFound, typeof(T).GetShortName()));
}
return(service);
}
private static object GetServiceInternal <T>(this IHasServices serviceProvider, bool failIfNone)
where T : class
{
return(serviceProvider.GetService <T>(failIfNone));
}
/// <summary>
/// Gets the service of the specified <paramref name="serviceType"/>.
/// </summary>
/// <param name="serviceProvider">The service provider to query for the service.</param>
/// <param name="serviceType">Type of the service to get.</param>
/// <returns>The service of specified type.</returns>
public static object GetService(this IHasServices serviceProvider, Type serviceType)
{
return(serviceProvider.GetService(serviceType, false));
}