NetCore配置文件读取

读取appSetting文件

配置文件如下

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*",
  "WebSetting": {
    "WebName": "ASP.NET Core",
    "Title": "Hello Title",
    "Behavior": {
      "IsCheckIp": true,
      "MaxConnection": 300
     }
   }
}

方法一、键读取

首先，在类构造函数注入  IConfiguration，例如：

 public IConfiguration Configuration { get; }
 public ValuesController(IConfiguration configuration)
 {
     Configuration = configuration;
 }

然后就可以在该类任何方法读取：

[HttpGet]
public ActionResult<IEnumerable<string>> Get()
{
   var title = Configuration["WebSetting:Title"];
   var isCheckIp = Configuration["WebSetting:Behavior:IsCheckIp"];
   return new string[] { title, isCheckIp };
}

方法二、绑定读取

首先，还是类构造函数注入ICofiguration

public IConfiguration Configuration { get; }
public ValuesController(IConfiguration configuration)
{
    Configuration = configuration;
}

然后，创建配置项结构对应的配置模型

public class Behavior
{
    public bool IsCheckIp { get; set; }
    public int MaxConnection { get; set; }
}

public class WebSetting
{
     public string WebName { get; set; }
     public string Title { get; set; }
     public Behavior Behavior { get; set; }
}

最后如下方式读取配置

[HttpGet]
public ActionResult<IEnumerable<string>> Get()
{
   var webSetting = new WebSetting();
   Configuration.GetSection("WebSetting").Bind(webSetting);
   var webName = webSetting.WebName;
   var isCheckIp = webSetting.Behavior.IsCheckIp;
   return new string[] { webName, isCheckIp.ToString() };
}

方法三、注册读取

首先，创建配置项结构对应的配置模型

public class Behavior
{
    public bool IsCheckIp { get; set; }
    public int MaxConnection { get; set; }
}

public class WebSetting
{
     public string WebName { get; set; }
     public string Title { get; set; }
     public Behavior Behavior { get; set; }
}

然后，在 ConfigureServices 方法中注册

 public void ConfigureServices(IServiceCollection services)
{
          
    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
    //注册配置
    services.Configure<WebSetting>(Configuration.GetSection("WebSetting"));
}

最后读取配置：在读取配置的类构造函数注入IOptions，就可以在该类任何位置读取配置如下

1、构造函数注入读取

private IOptions<WebSetting> webSettingOption;
//构造函数
public ValuesController(IOptions<WebSetting> _webSettingOption)
{
    webSettingOption = _webSettingOption;
}

       
[HttpGet]
public ActionResult<IEnumerable<string>> Get()
{
     var webName = webSettingOption.Value.WebName;
     var isCheckIp = webSettingOption.Value.Behavior.IsCheckIp;
     return new string[] { webName, isCheckIp.ToString() };
}

自定义配置文件

首先新建配置文件，名称customSetting.json，并右击该文件选择属性进行设置，设置复制到输出目录：始终复制

{
  "Name": "Rick",
  "Age": 99,
  "TicketSetting": {
    "BaseHost": "www.baidu.com",
    "Port": 9950
  }
}

然后定义配置文件结果类

public class CustomSetting
{
  public string Name { get; set; }

  public int Age { get; set; }

  public TicketSetting TicketSetting { get; set; }
}

public class TicketSetting
{
  public string BaseHost { get; set; }
  public int Port { get; set; }
}

其次ConfigureServices方法进行配置注册

public void ConfigureServices(IServiceCollection services)
{
      services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

      var config = new ConfigurationBuilder()
                .AddJsonFile("customSetting.json")
                .Build();
      services.Configure<CustomSetting>(config);
}

最后读取

private IOptions<CustomSetting> _option;
public ValuesController(IOptions<CustomSetting> option)
{
            _option = option;
}

[HttpGet]
public ActionResult<IEnumerable<string>> Get()
{
    var host = _option.Value.TicketSetting.BaseHost;
    return new string[] { host };
}