只需模拟它以及任何其他依赖项:

Just mock it as well as any other dependency:

var mock = new Mock<ILogger<BlogController>>();
ILogger<BlogController> logger = mock.Object;

//or use this short equivalent 
logger = Mock.Of<ILogger<BlogController>>()

var controller = new BlogController(logger);

您可能需要安装 Microsoft.Extensions.Logging.Abstractions 包才能使用 ILogger.

You probably will need to install Microsoft.Extensions.Logging.Abstractions package to use ILogger<T>.

此外，您可以创建一个真正的记录器:

Moreover you can create a real logger:

var serviceProvider = new ServiceCollection()
    .AddLogging()
    .BuildServiceProvider();

var factory = serviceProvider.GetService<ILoggerFactory>();

var logger = factory.CreateLogger<BlogController>();