- **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"
  }
}
```

- **編寫配置檔案操作類**
```csharp
/// <summary>
/// 讀取appsetting配置
/// </summary>
public static class AppSetting
{
    private static IConfigurationSection _configurationSection = null;

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

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

- **在Startup.cs的ConfigureServices中設定配置**
```csharp
public void ConfigureServices(IServiceCollection services)
{
    // ...

// 設定配置
    AppSetting.SetAppSetting(Configuration.GetSection("Config"));
}
```

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

.NET Core中如何讀取appsetting.json配置檔案

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