.NET6之MiniAPI(四)：配置

　　配置文件，是一个每个应用服务程序常用的功能，从原来的终端应用时代，到现在的元宇宙时代，配置都是很悠然自得的存在。asp.net core提供了强大的配置文件访问机制，不管是MVC API还是MiniAPI，使用方式都是相同的。

　　框架默认的配置文件是：appsettings.json，可以以json的格式存放自己复杂的配置:

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "ConnectionStrings": {
    "ExamDatabase": "server=.;database=Exam;uid=sa;pwd=sa;"
  },
  "AppInfo": {
    "Name": "Mini & Powerful",
    "Version": "v1.0.0",
    "Author": {
      "Architect": "桂素伟-A",
      "Programmer": "桂素伟-P",
      "Designer": "桂素伟-D"
    },
    "Features": [ "Learn MiniAPI", "Architect Element" ]
  }
}

简单取值

var architect = builder.Configuration.GetSection("AppInfo:Author:Architect").Value;
var features1=builder.Configuration.GetSection("AppInfo:Features:1").Value;

用record绑定

record

public record AppInfoRecord(string? Name, string? Version, AuthorRecord? Author, string[]? Features);
public record AuthorRecord(string? Architect, string? Programmer, string? Designer);

绑定

var authorRecord = new AuthorRecord(null, null, null);
var appInfoRecord = new AppInfoRecord(null, null, authorRecord, null);
builder.Configuration.GetSection("AppInfo").Bind(appInfoRecord);

结果

 用class绑定
class

public class AppInfo
{
    public string? Name { get; set; }
    public string? Version { get; set; }
    public Author? Author { get; set; }
    public string[]? Features { get; set; }
}
public class Author
{
    public string? Architect { get; set; }
    public string? Programmer { get; set; }
    public string? Designer { get; set; }
}

绑定

var appInfo = new AppInfo();
builder.Configuration.GetSection("AppInfo").Bind(appInfo);

结果

 

　　用record和class绑定各有优势，record定义的时间代码简单，绑定要复杂一些，class正好相反，定义要复杂一些，绑定时简单。

从IConfiguration中获取配置

可以在路由方法中获取配置信息

app.MapGet("/getappinfo", (IConfiguration config) =>
{
    return config.GetSection("AppInfo:Name").Value;
});

从路由中取配置文件
首选注入

var authorRecord = new AuthorRecord(null, null, null);
var appInfoRecord = new AppInfoRecord(null, null, authorRecord, null);
builder.Configuration.GetSection("AppInfo").Bind(appInfoRecord);
builder.Services.AddSingleton(appInfoRecord);

取配置数据

app.MapGet("/appinfo", (AppInfoRecord appinfo) =>
{
    return appinfo;
});

结果

读取其他格式的配置文件
myconfig.ini

[iniconfig]
key1=value1
key2=value2

加载配置文件，并取值

builder.Host.ConfigureAppConfiguration((hostingContext, config) =>
{
    config.AddIniFile("myconfig.ini",
                       optional: true,
                       reloadOnChange: true);
});

var key1=builder.Configuration.GetSection("iniconfig:key1").Value;

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