所以我有一个服务,例如它是 ASPNET Core 上的电子邮件服务。
当我将我的服务添加到 ASPNET DI 容器时,我想在我的 IServiceCollection 上应用以下模式来设置我的服务。
public interface IEmailService
{
void SendMail(string recipient, string message);
}
public void ConfigureServices(IServiceCollection services)
{
//configures my service
services.AddEmailService<MyEmailService>(options => options.UseEmailServer(sender, smtpHost, smtpPort, smtpPassword));
}
如果可能的话,我想知道最好的方法是什么。我确定我需要为 IServiceCollection 上的 .AddEmailService() 方法创建一个扩展方法,但是除此之外的任何内容我都不确定从哪里开始或从哪里开始查找。
最佳答案
这是一个带有注释的示例应用程序,可让您了解不同的事情在做什么:
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
// Add the options stuff. This will allow you to inject IOptions<T>.
services.AddOptions();
// This will take care of adding and configuring the email service.
services.AddEmailService<MyEmailService>(options =>
{
options.Host = "some-host.com";
options.Port = 25;
options.Sender = "firstname@lastname.com";
options.Username = "email";
options.Password = "sup4r-secr3t!";
});
}
public void Configure(IApplicationBuilder app, ILoggerFactory loggerFactory)
{
// Make sure we add the console logger.
loggerFactory.AddConsole();
app.Use(async (context, next) =>
{
// Retrieve the email service from the services.
var emailService = context.RequestServices.GetRequiredService<IEmailService>();
// Send the email
await emailService.SendMail("hello@recipient.com", "Hello World!");
});
}
public static void Main(string[] args)
{
WebApplication.Run<Startup>(args);
}
}
public interface IEmailService
{
Task SendMail(string recipient, string message);
}
public class EmailOptions
{
public string Sender { get; set; }
public string Host { get; set; }
public int Port { get; set; }
public string Username { get; set; }
public string Password { get; set; }
}
public class MyEmailService : IEmailService
{
public MyEmailService(IOptions<EmailOptions> options, ILogger<MyEmailService> logger)
{
Options = options; // This contains the instance we configured.
Logger = logger;
}
private IOptions<EmailOptions> Options { get; }
private ILogger<MyEmailService> Logger { get; }
public Task SendMail(string recipient, string message)
{
// Send the email
var builder = new StringBuilder();
builder.AppendLine($"Host: {Options.Value.Host}");
builder.AppendLine($"Port: {Options.Value.Port}");
builder.AppendLine($"Username: {Options.Value.Username}");
builder.AppendLine($"Password: {Options.Value.Password}");
builder.AppendLine("---------------------");
builder.AppendLine($"From: {Options.Value.Sender}");
builder.AppendLine($"To: {recipient}");
builder.AppendLine("---------------------");
builder.AppendLine($"Message: {message}");
Logger.LogInformation(builder.ToString());
return Task.FromResult(0);
}
}
public static class ServiceCollectionExtensions
{
public static IServiceCollection AddEmailService<TEmailService>(this IServiceCollection services, Action<EmailOptions> configure)
where TEmailService : class, IEmailService
{
// Configure the EmailOptions and register it in the service collection, as IOptions<EmailOptions>.
services.Configure(configure);
// Add the service itself to the collection.
return services.AddSingleton<IEmailService, TEmailService>();
}
}
这是在控制台中运行的应用程序:
![Application Running](https://i.sstatic.net/DhSZA.jpg)
如您所见,应用程序正在从配置的
EmailOptions
中提取一些信息。 ,以及一些信息形成传入的参数。编辑 :这些是所需的包:
"Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
"Microsoft.Extensions.OptionsModel": "1.0.0-rc1-final",
"Microsoft.Extensions.Logging.Console": "1.0.0-rc1-final"
关于asp.net-core - 在执行 DI 时为服务指定选项的简洁方法,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35178524/