.NET Core 配置文件

老一代配置系统

1，XML格式 格式单一。

2，配置信息Kye，只能一维化配置

3，框架信息和应用程序信息混合到一起

 

应用程序中是　　App.config

web项目中           web.config

使用程序集  System.Configuration

新一代配置系统

1支持配置文件格式 json  xml  init  环境变量  memory

2参数热加载

3参数多维

nuget包

Microsoft.Extensions.Configuration

主要是用上面的

下面的是对应不同文件类型的扩展   都是扩展方法

Microsoft.Extensions.Configuration.Json

Microsoft.Extensions.Configuration.Xml

Microsoft.Extensions.Configuration.Init

Microsoft.Extensions.Configuration.EnvironmentVariables

下面的是进行模型转换的

Microsoft.Extensions.Configuration.Binder

数据读取

//1   :  运算符  层级管理  数据的话用索引
var dcf1 = config["mysql:host"];
Console.WriteLine(dcf1);
var dcf11 = config["shopidlist:1:entid"];
Console.WriteLine(dcf11);


//2   getsection              getsection("")[""]
var dcf2 = config.GetSection("mysql").GetSection("host").Value;
Console.WriteLine(dcf2);
var dcf21 = config.GetSection("mysql:host").Value;
Console.WriteLine(dcf21);
var dcf3 = config.GetSection("mysql")["host"];
Console.WriteLine(dcf3);
var dcf4 = config.GetSection("shopidlist").GetSection("1")["entid"];
Console.WriteLine(dcf4);
var dcf5 = config.GetSection("shopidlist").GetSection("1").GetSection("entid").Value;
Console.WriteLine(dcf5);
//3强类型读取       Microsoft.Extensions.Configuration.Binder
//开发中常用强类型
var dcf6 = config.GetValue<int>("shopidlist:1:entid");
Console.WriteLine(dcf6);

Rootobject dcf7 = new Rootobject();
config.Bind(dcf7);
Console.WriteLine(dcf7.mysql.host);

弱类型方式读取

<1>: ':'运算符 mysql:host

IConfiguration configuration = new ConfigurationBuilder().SetBasePath(Environment.CurrentDirectory)
.AddJsonFile($"appsettings.json", optional: true, reloadOnChange: true)
//.AddXmlFile("appsettings.xml")

//.AddEnvironmentVariables()
.Build();

var info = configuration["shopidlist:0:entid"];

{
"mysql": {
"host": "192.168.23.1",
"port": 3306
},
"shopidlist": [
{ "entid": 20 },
{ "entid": 25 }
]
}

<2> GetSection （不同的人，不同的使用习惯） getSection("mysql")["host"]

//var info = configuration.GetSection("shopidlist").GetSection("1").GetSection("entid").Value;
var info = configuration.GetSection("shopidlist").GetSection("1")["entid"];

public IConfigurationSection GetSection(string key)
{
string[] textArray1 = new string[] { this.Path, key };
return this._root.GetSection(ConfigurationPath.Combine(textArray1));
}

强类型方式读取 : Microsoft.Extensions.Configuration.Binder

<1> GetValue

var info = configuration.GetValue<int>("mysql:port");

public static object GetValue(this IConfiguration configuration, Type type, string key, object defaultValue)
{
string str = configuration.GetSection(key).Value;
if (str != null)
{
return ConvertValue(type, str);
}
return defaultValue;
}

<2> 配置映射为实体类Bind,Get<T>

Rootobject rootobject = new Rootobject();

configuration.Bind(rootobject);

Configuration.GetSection("Position").Get<PositionOptions>();

StartUp类中

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<PositionOptions>(Configuration.GetSection("Position"));
    services.AddRazorPages();
}

其他类注入
public class Test2Model : PageModel
{
    private readonly PositionOptions _options;

    public Test2Model(IOptions<PositionOptions> options)
    {
        _options = options.Value;
    }

    public ContentResult OnGet()
    {
        return Content($"Title: {_options.Title} 
" +
                       $"Name: {_options.Name}");
    }
}

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