- **appsetting.json中填入配置**
```json
{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*",
  "Config": {
    "PgConnectionString": "User ID=yanfeng;Password=111111;Host=192.168.31.114;Port=5432;Database=qms"
  }
}
```

- **编写配置文件操作类**
```csharp
/// <summary>
/// 读取appsetting配置
/// </summary>
public static class AppSetting
{
    private static IConfigurationSection _configurationSection = null;

/// <summary>
    /// 读取配置
    /// </summary>
    /// <param name="key"></param>
    /// <returns></returns>
    public static string GetAppSetting(string key)
    {
        return _configurationSection.GetSection(key)?.Value;
    }

/// <summary>
    /// 设置配置
    /// </summary>
    /// <param name="section"></param>
    public static void SetAppSetting(IConfigurationSection section)
    {
        _configurationSection = section;
    }
}
```

- **在Startup.cs的ConfigureServices中设置配置**
```csharp
public void ConfigureServices(IServiceCollection services)
{
    // ...

// 设置配置
    AppSetting.SetAppSetting(Configuration.GetSection("Config"));
}
```

- **使用配置**
```csharp
string connStr = AppSetting.GetAppSetting("PgConnectionString");
```

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.NET Core中如何读取appsetting.json配置文件

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