我正在调用此 function download_and_post(){
//simple version
//button click or whatever that starts the download
window.content.location.href = "javascript:void download_document()";
var dJsm = Components.utils.import("resource://gre/modules/Downloads.jsm").Downloads;
var tJsm = Components.utils.import("resource://gre/modules/Task.jsm").Task;
var fuJsm = Components.utils.import("resource://gre/modules/FileUtils.jsm").FileUtils;
var nsiPromptService = Components.classes["@mozilla.org/embedcomp/prompt-service;1"].getService(Components.interfaces.nsIPromptService);
var view = {
onDownloadChanged: function (download) {
if (download.succeeded) {
var file = fuJsm.File(download.target.path);
NetUtil.asyncFetch(file, function(inputStream, status) {
if (!Components.isSuccessCode(status)) {
return;
}
var data = NetUtil.readInputStreamToString(inputStream, inputStream.available());
btoa_data = window.btoa(data);
var xmlhttp = new XMLHttpRequest();
xmlhttp.open("POST","http://someserver.com",true);
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.send(
"file_data="+encodeURIComponent(btoa_data)
+"&file_name="+ get_file_for_os(download.target.path)
);
});
tJsm.spawn(function () {
let list = yield dJsm.getList(Downloads.ALL);
list.removeView(view);
}).then(null, Components.utils.reportError);
}
}
};
tJsm.spawn(function () {
let list = yield dJsm.getList(Downloads.ALL);
list.addView(view);
}).then(null, Components.utils.reportError);
}
function get_file_for_os(file){
var osString = Components.classes["@mozilla.org/xre/app-info;1"].getService(Components.interfaces.nsIXULRuntime).OS;
if (osString == "Linux"){
var document_name_no_path = file.split('/').pop();
}else{
var document_name_no_path= file.split("\\").pop();
}
return document_name_no_path;
}
并收到以下错误消息。为什么依赖注入不会提供非空serviceProvider.GetRequiredService<SignInManager<IdentityUser>>()？
contextAccessor我已经在示例项目here中看到了构造函数注入，它只是起作用。我错过了什么？
System.ArgumentNullException was unhandled by user code
HResult=-2147467261
Message=Value cannot be null.
Parameter name: contextAccessor
ParamName=contextAccessor
Source=Microsoft.AspNet.Identity
StackTrace:
at Microsoft.AspNet.Identity.SignInManager`1..ctor(UserManager`1 userManager, IHttpContextAccessor contextAccessor, IUserClaimsPrincipalFactory`1 claimsFactory, IOptions`1 optionsAccessor, ILogger`1 logger)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at Microsoft.Framework.DependencyInjection.ServiceLookup.Service.ConstructorCallSite.Invoke(ServiceProvider provider)
at Microsoft.Framework.DependencyInjection.ServiceProvider.ScopedCallSite.Invoke(ServiceProvider provider)
at Microsoft.Framework.DependencyInjection.ServiceProvider.<>c__DisplayClass8_0.<RealizeService>b__0(ServiceProvider provider)
at Microsoft.Framework.DependencyInjection.ServiceProvider.GetService(Type serviceType)
at Microsoft.Framework.DependencyInjection.ServiceProviderExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
at Microsoft.Framework.DependencyInjection.ServiceProviderExtensions.GetRequiredService[T](IServiceProvider provider)
at ResourceOwnerPasswordFlow.Startup.<>c__DisplayClass6_0.<Configure>b__1(OpenIdConnectServerOptions options) in C:\Users\BigFont\Documents\GitHub\AspNet.Security.OpenIdConnect.Server\samples\ResourceOwnerPasswordFlow\Startup.cs:line 109
at Microsoft.Framework.OptionsModel.ConfigureOptions`1.Configure(TOptions options, String name)
at Microsoft.AspNet.Authentication.AuthenticationMiddleware`1..ctor(RequestDelegate next, IOptions`1 options, ILoggerFactory loggerFactory, IUrlEncoder encoder, ConfigureOptions`1 configureOptions)
at AspNet.Security.OpenIdConnect.Server.OpenIdConnectServerMiddleware..ctor(RequestDelegate next, ILoggerFactory loggerFactory, IDistributedCache cache, IHtmlEncoder htmlEncoder, IUrlEncoder urlEncoder, IDataProtectionProvider dataProtectionProvider, IOptions`1 options, ConfigureOptions`1 configuration) in C:\Users\BigFont\Documents\GitHub\AspNet.Security.OpenIdConnect.Server\src\AspNet.Security.OpenIdConnect.Server\OpenIdConnectServerMiddleware.cs:line 38
InnerException:
我还在Music Store Tests中看到了public ManageController(
UserManager<ApplicationUser> userManager,
SignInManager<ApplicationUser> signInManager)
{
UserManager = userManager;
SignInManager = signInManager;
}
明确添加到服务集合中。我还需要这样做吗？怎么样？
HttpContextAccessor答案 0 :(得分：1)
serviceProvider.GetRequiredService＆LT; SignInManager＆LT; IdentityUser＆GT;＆GT;（）
所以看起来你正在使用服务定位器反模式，如果你必须这样就好了但似乎你要求的是错误的类型 不应该使用：
serviceProvider.GetRequiredService< SignInManager< ApplicationUser>>()
因为这是注入ManageController的类型，你知道DI可以解决它吗？
我可以告诉你，在我自己的代码中，我使用构造函数注入，我的一个类在其构造函数中使用IHttpContextAccessor并且它被注入很好，而我不必在服务中注册该类型集合所以我认为它会从Microsoft代码中添加到其他地方，因为它们在身份类中也依赖于它
我认为你不应该在服务集合中添加HttpContext的实例。如果您需要访问HttpContext，那么您应该在IHttpContextAccessor上声明构造函数依赖项，这样您就可以访问当前的HttpContext
例如在我的代码中，我有一个像这样的构造函数：
public RequestSiteResolver(
ISiteRepository siteRepository,
IConfiguration configuration,
IHttpContextAccessor httpContextAccessor)
{
contextAccessor = httpContextAccessor;
siteRepo = siteRepository;
config = configuration;
}
和IHttpContextAccessor确实被注入，而我不必将其显式添加到服务容器中。然后我可以稍后使用它来访问当前httpContext，如下所示：
string host = contextAccessor.HttpContext.Request.Host.Value;