ASP.NET 5 配置文件打不开

Question

我已经创建了一个静态 class 来使用我的配置，但是当我尝试将 JSON 文件添加到配置时我遇到了一个异常：

MyConfigurations.json:

{ "ConnectionString": "my connection string", ...}

我的静态 class 构造函数：

static MyConfigurations() {
    var configuration = new Configuration()
        .AddJsonFile("MyConfigurations.json")
        .AddEnvironmentVariables();
    ...
    ...

我的异常发生在.AddJsonFile执行时。

异常：Object reference not set to an instance of an object."

堆栈跟踪：

at Microsoft.Framework.ConfigurationModel.PathResolver.get_ApplicationBaseDirectory() at Microsoft.Framework.ConfigurationModel.JsonConfigurationExtension.AddJsonFile(IConfigurationSourceRoot configuration, String path, Boolean optional) at Microsoft.Framework.ConfigurationModel.JsonConfigurationExtension.AddJsonFile(IConfigurationSourceRoot configuration, String path) at Project.SharedKernel.MyConfigurations..cctor() in C:\Project\Project.SharedKernel\MyConfigurations.cs:line 86

Answer 1

您尚未设置配置 API 需要的 应用程序基本路径 来确定物理配置文件所在的位置。您可以使用 SetBasePath 扩展方法设置它。典型的实现如下所示：

public Startup(IApplicationEnvironment appEnv)
{
    var configuration = new ConfigurationBuilder()
        .SetBasePath(appEnv.ApplicationBasePath)
        .AddJsonFile("MyConfigurations.json")
        .AddEnvironmentVariables()
        .Build();
}

注意：这仅适用于 beta8，请参阅 . You don't have to specify the default base path anymore in RC1: https://github.com/aspnet/Announcements/issues/88。