AspNetCore 配置--Configuration

发表于 | 分类于 ，

通过UML分析 Configuration 初始化的过程

Configuration初始化的过程

  1. 入口启动

    1
    2
    3
    4
    public static IWebHost BuildWebHost(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .Build();

    Configuration 的初始化位于 IWebHostBuilder.Build() 方法中，其中有一个方法: BuildCommonServices

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    44
    45
    46
    47
    48
    public IWebHost Build()
    {
        //...............................省略................................//
        //*******************************************************************//
        var hostingServices = BuildCommonServices(out var hostingStartupErrors);
        //*******************************************************************//
        var applicationServices = hostingServices.Clone();
        var hostingServiceProvider = hostingServices.BuildServiceProvider();

        AddApplicationServices(applicationServices, hostingServiceProvider);

        var host = new WebHost(
            applicationServices,
            hostingServiceProvider,
            _options,
            _config,
            hostingStartupErrors);

        host.Initialize();

        return host;
    }

    private IServiceCollection BuildCommonServices(out AggregateException hostingStartupErrors)
    {
        //...............................省略................................//
        //*******************************************************************//
        var builder = new ConfigurationBuilder()
            .SetBasePath(_hostingEnvironment.ContentRootPath)
            .AddInMemoryCollection(_config.AsEnumerable());

        foreach (var configureAppConfiguration in _configureAppConfigurationBuilderDelegates)
        {
            configureAppConfiguration(_context, builder);
        }

        var configuration = builder.Build();
        //*******************************************************************//
        //至此Configure初始化完毕

        //...............................省略................................//
        foreach (var configureServices in _configureServicesDelegates)
        {
            configureServices(_context, services);
        }

        return services;
    }

  2. ConfigurationBuilder.Build() UML 分析