C# 如何在ASP.NET Core 1.0的DI中的Startup类中添加IHttpContextAccessor?
在ASP.NET Core RC 1中,我使用以下代码检索上下文的值(页面的完整地址)。然后我在配置中记录了这个值C# 如何在ASP.NET Core 1.0的DI中的Startup类中添加IHttpContextAccessor?,c#,asp.net-core,asp.net-core-mvc,asp.net-core-1.0,C#,Asp.net Core,Asp.net Core Mvc,Asp.net Core 1.0,在ASP.NET Core RC 1中,我使用以下代码检索上下文的值(页面的完整地址)。然后我在配置中记录了这个值 public class Startup { public IConfigurationRoot Configuration { get; set; } private IHostingEnvironment CurrentEnvironment { get; set; } private IHttpContextAccessor H
public class Startup
{
public IConfigurationRoot Configuration { get; set; }
private IHostingEnvironment CurrentEnvironment { get; set; }
private IHttpContextAccessor HttpContextAccessor { get; set; }
public Startup(IHostingEnvironment env,
IHttpContextAccessor httpContextAccessor)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);
if (env.IsDevelopment())
{
builder.AddUserSecrets();
}
builder.AddEnvironmentVariables();
Configuration = builder.Build();
CurrentEnvironment = env;
HttpContextAccessor = httpContextAccessor;
}
public void ConfigureServices(IServiceCollection services)
{
...
services.AddOptions();
services.Configure<WebAppSettings>(configuration);
services.Configure<WebAppSettings>(settings =>
{
...
settings.WebRootPath = CurrentEnvironment.WebRootPath;
settings.DomainUrl = HttpContextAccessor.HttpContext.Request.Host.ToUriComponent();
});
}
}
公共类启动
{
公共IConfigurationRoot配置{get;set;}
私有IHostingEnvironment CurrentEnvironment{get;set;}
专用IHttpContextAccessor HttpContextAccessor{get;set;}
公共启动(IHostingEnvironment env,
IHttpContextAccessor(httpContextAccessor)
{
var builder=new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile(“appsettings.json”,可选:true,重载更改:true)
.AddJsonFile($“appsettings.{env.EnvironmentName}.json”,可选:true);
if(env.IsDevelopment())
{
builder.AddUserSecrets();
}
builder.AddEnvironmentVariables();
Configuration=builder.Build();
CurrentEnvironment=env;
HttpContextAccessor=HttpContextAccessor;
}
public void配置服务(IServiceCollection服务)
{
...
services.AddOptions();
服务。配置(配置);
配置(设置=>
{
...
settings.WebRootPath=CurrentEnvironment.WebRootPath;
settings.DomainUrl=HttpContextAccessor.HttpContext.Request.Host.ToUriComponent();
});
}
}
现在我开始在ASP.NETCore1.0上更新项目。但在网站启动期间,我发现以下错误:
System.InvalidOperationException无法解析类型的服务
“Microsoft.AspNetCore.Http.IHttpContextAccessor”时尝试
激活“MyProject.Startup”
在
Microsoft.Extensions.Internal.ConstructorMatcher.CreateInstance(IServiceProvider
供应商)在
Microsoft.Extensions.Internal.ActivatorUtilities.CreateInstance(IServiceProvider
提供程序,类型instanceType,对象[]参数)位于
Microsoft.Extensions.Internal.ActivatorUtilities.GetServiceOrCreateInstance(IServiceProvider
提供程序,类型)位于
Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetServiceOrCreateInstance(IServiceProvider
提供程序,类型)位于
Microsoft.AspNetCore.Hosting.Internal.StartupLoader.LoadMethods(IServiceProvider
服务,键入startupType,字符串environmentName)位于
Microsoft.AspNetCore.Hosting.c_uuuudisplayClass1_0.b_uuu1(IServiceProvider
sp)在
Microsoft.Extensions.DependencyInjection.ServiceLookup.FactoryService.Invoke(ServiceProvider
供应商)在
Microsoft.Extensions.DependencyInjection.ScopedCallSite.Invoke(ServiceProvider
供应商)在
Microsoft.Extensions.DependencyInjection.SingletonCallSite.Invoke(ServiceProvider
供应商)在
Microsoft.Extensions.DependencyInjection.c__DisplayClass12_0.b__0(ServiceProvider
供应商)在
Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(类型
服务类型)在
Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider
提供程序,键入serviceType)位于
Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider
供应商)在
Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureStartup()位于
Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices()
在Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()上
.NET Framework X64 v4.0.30319.42000 | Microsoft.AspNetCore.Hosting
版本1.0.0-rtm-21431 | Microsoft Windows 6.1.7601 S
如何在应用程序启动期间获取新版本IHttpContextAccessor?它不再是默认服务。您必须在Startup.cs中配置它
services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();
services.TryAddSingleton<IActionContextAccessor, ActionContextAccessor>();
来源:您可以通过这种方式添加
services.AddSingleton();
如果查看.Net Core的重大更改,您会发现默认情况下不再注册IHttpContextAccessor
。官方声明:添加依赖项Startap.cs
并不能解决我的问题,因为类构造函数中必须使用IHttpContextAccessor
。所以我在Program.cs
中添加了一个依赖项,一个问题应该是AddTransient
,因为它将用于请求吗?@Ruchan你得到过这个问题的答案吗?它应该是单态还是瞬态?@Reft我用的是单态。这里有更多关于这个问题的信息,请阅读davidfowl的答案
services.AddHttpContextAccessor();
services.TryAddSingleton<IActionContextAccessor, ActionContextAccessor>();