我正在尝试在最新的dotnet核心版本(3.1)上从StructureMap迁移到Lamar(4.1.0)
这个项目在改用Lamar之前就已经起作用了,但是已经发生了很多变化,让我感到迷茫。
问题?扫描发生后,如何使用已扫描对象的构造函数创建对象的实例。我了解StructureMap有点不同,但是此代码以前可以工作。
下面的代码:
Startup.cs(在新的Lamar尝试)
var container = new Container(cfg =>
{
cfg.Scan(scanner =>
{
scanner.AssembliesAndExecutablesFromApplicationBaseDirectory(a => a.FullName.Contains("Project.Name.Here"));
scanner.WithDefaultConventions();
scanner.SingleImplementationsOfInterface();
});
cfg.For<IServerInformationDataAccess>()
.Use(new ServerInformationDataAccess(Configuration.GetConnectionString(DbConnectionKey), Container.GetInstance<IMapper>()));
Startup.cs(起作用的旧版本)
[新Lamar(4.1)不允许我创建没有参数的]
尝试了所有实例,但是它们没有用...所以我在这里
var container = new Container();
container.Configure(cfg =>
{
cfg.Scan(s =>
{
s.AssembliesAndExecutablesFromApplicationBaseDirectory(a => a.FullName.Contains("Project.Name.Here"));
s.WithDefaultConventions();
s.SingleImplementationsOfInterface();
});
cfg.For<IServerInformationDataAccess>()
.Use<ServerInformationDataAccess>(sida => new ServerInformationDataAccess(Configuration.GetConnectionString(DbConnectionKey), container.GetInstance<IMapper>()));
Program.cs
public class Program
{
public static void Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.UseLamar()
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
});
}
在这种情况下,Use
充当工厂代表
//...
cfg.For<IServerInformationDataAccess>()
.Use<ServerInformationDataAccess>(c => { //<-- c in this case is a container context
var connectionString = Configuration.GetConnectionString(DbConnectionKey);
var mapper = c.GetInstance<IMapper>();
return new ServerInformationDataAccess(connectionString, mapper);
});
//...