我以前从未见过且无法摆脱的令人沮丧的错误。在 .NET 6 和 MediatR 12 中使用简单的 Azure HTTP 函数,并在 Startup.cs 中获取 MediatR DI 的以下内容:
系统.MissingMethodException
H结果=0x80131513
消息 = 未找到方法:'Boolean Microsoft.Extensions.DependencyInjection.ServiceDescriptor.get_IsKeyedService()'。来源=MediatR
堆栈跟踪:
在 MediatR.Registration.ServiceRegistrar.<>c.b__12_0(ServiceDescriptor 服务) 在 System.Linq.Enumerable.WhereSelectEnumerableIterator
1.MoveNext() 在 System.Linq.Enumerable.SelectManySingleSelectorIterator2.MoveNext() at System.Linq.Enumerable.<OfTypeIterator>d__61
2.MoveNext() 在 System.Linq.Enumerable.Any[TSource](IEnumerable2.MoveNext() at System.Linq.Enumerable.WhereSelectEnumerableIterator
2 谓词) 在MediatR.Registration.ServiceRegistrar.RegisterBehaviorIfImplementationsExist(IServiceCollection服务,类型behaviorType,类型subBehaviorType) 在 MediatR.Registration.ServiceRegistrar.AddRequiredServices(IServiceCollection 服务、MediatRServiceConfiguration 服务配置) 在 Microsoft.Extensions.DependencyInjection.ServiceCollectionExtensions.AddMediatR(IServiceCollection 服务、MediatRServiceConfiguration 配置) 在 C:\Users\shamu\source 中的 TheMove.Functions.Startup.Configure(IFunctionsHostBuilder builder) epos\TheMove\TheMove.Functions\Startup.cs:第 25 行 在 Microsoft.Azure.WebJobs.WebJobsBuilderExtensions.ConfigureAndLogUserConfiguredServices(IWebJobsStartup 启动、WebJobsBuilderContext 上下文、IWebJobsBuilder 构建器、ILoggerFactory loggerFactory) 在 Microsoft.Azure.WebJobs.WebJobsBuilderExtensions.UseWebJobsStartup(IWebJobsBuilder 构建器,类型startupType,WebJobsBuilderContext 上下文,ILoggerFactory loggerFactory) 在 Microsoft.Azure.WebJobs.WebJobsBuilderExtensions.UseExternalStartup(IWebJobsBuilder 构建器、IWebJobsStartupTypeLocator 启动类型定位器、WebJobsBuilderContext 上下文、ILoggerFactory loggerFactory) 在 Microsoft.Azure.WebJobs.Script.ScriptHostBuilderExtensions.<>c__DisplayClass7_0.b__1(HostBuilderContext 上下文,IWebJobsBuilder webJobsBuilder)1 source, Func
源代码:
using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using System;
[assembly: FunctionsStartup(typeof(TheMove.Functions.Startup))]
namespace TheMove.Functions
{
public class Startup : FunctionsStartup
{
public IConfiguration Configuration { get; }
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public Startup() { }
public override void Configure(IFunctionsHostBuilder builder)
{
if(builder != null)
{
var assembly = AppDomain.CurrentDomain.Load("TheMove.Application");
builder.Services.AddMediatR(cfg =>
{
cfg.RegisterServicesFromAssembly(assembly);
});
}
}
}
}
这个问题的潜在解决方案,也许不适用于所有人,但我的参考资料弄乱了,我还无法找出原因......
[assembly: FunctionsStartup(typeof(My.Namespace.Startup))] // I get a compiler error if I exclude the the full namespace.
namespace My.Namespace;
public class Startup : FunctionsStartup
{
public void Configure(IFunctionsHostBuilder builder)
{
// This does NOT work:
builder.Services.AddMediatr(x => x.RegisterServicesFromAssembly<Startup>());
// This works, note the fully qualified Startup
builder.Services.AddMediatR(x => x.RegisterServicesFromAssembly<My.Namespace.Startup>());
}
}