在 beta8 中的 ConfigurationBuilder 中指定应用程序基路径

Question

我曾经像这样为 ConfigurationBuilder 指定应用程序基本路径：

public Startup(IApplicationEnvironment appEnv)
{
    var configurationBuilder = new ConfigurationBuilder(appEnv.ApplicationBasePath)
        .AddJsonFile("config.json")
        .AddEnvironmentVariables();

    Configuration = configurationBuilder.Build();
}

但是，从 beta8 开始，ConfigurationBuilder 的构造函数不再采用应用程序基本路径参数，它现在会抛出异常。

如何指定基本路径？

Answer 1

如果我们查看IConfigurationBuilder界面上的source code of ConfigurationBuilder, we can see that the constructor no longer accepts a string representing the application base path. In stead, we have to use the SetBasePath() extension method来指定它：

public Startup(IApplicationEnvironment appEnv)
{
    var configurationBuilder = new ConfigurationBuilder()
        .SetBasePath(appEnv.ApplicationBasePath)
        .AddJsonFile("config.json")
        .AddEnvironmentVariables();

    Configuration = configurationBuilder.Build();
}

可以找到特定的提交 here。