前文讲获取配置文件内容的时候，是获取默认的appsettings.json配置文件的配置，下面说明下如何进行自定义配置文件获取
1. Json Provider
1.1 构建独立的IConfiguration
编写方法
public static IConfigurationRoot LoadSettings(this IHostEnvironment env)
{
return new ConfigurationBuilder()
.SetBasePath(AppDomain.CurrentDomain.BaseDirectory)
.AddJsonFile("common.json", optional: true, reloadOnChange: false)
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: false)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: false)
.AddEnvironmentVariables()
.Build();
}在Startup构造函数的时候进行赋值替换IConfiguration
private readonly IConfiguration _configuration;
public Startup(IWebHostEnvironment env)
{
_configuration = env.LoadSettings();
}该操作添加的配置项，只在startup范围生效。
1.2 在Progrom全局自定义配置
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureAppConfiguration((hostingContext, config) =>
{
var env = hostingContext.HostingEnvironment;
config.SetBasePath(env.ContentRootPath);
config.AddJsonFile("devappsettings.json", optional: false, reloadOnChange: true);
})
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
});注意：添加自定义文件的目录要注意，可能会存在因为目录问题所以找不到配置文件的情况。
2. Memory Provider
允许我们将一个应用程序配置直接配置到内存中，而不是像传统方式那样子必须制定一个物理文件。
var builder = new ConfigurationBuilder();
var profileCollection = new Dictionary<string, string>
{
{"AuthorProfile:FirstName", "Joydip"},
{"AuthorProfile:LastName", "Kanjilal"},
{"AuthorProfile:Address", "Hyderabad, India"}
};
builder.AddInMemoryCollection(profileCollection);
Configuration = builder.Build();使用
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureAppConfiguration((hostingContext, config) =>
{
var builder = new ConfigurationBuilder();
var profileCollection = new Dictionary<string, string>
{
{"AuthorProfile:FirstName", "Joydip"},
{"AuthorProfile:LastName", "Kanjilal"},
{"AuthorProfile:Address", "Hyderabad, India"}
};
builder.AddInMemoryCollection(profileCollection);
config.AddConfiguration(builder.Build());
})
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
});然后就可以通过IConfiguration实例去获取了。
3. 公共类获取配置文件
引用组件
Microsoft.Extensions.Configuration.Json
public class AppSettings
{
private static IConfiguration Configuration { get; set; }
public AppSettings(IConfiguration configuration)
{
Configuration = configuration;
}
/// <summary>
/// 封装要操作的字符
/// </summary>
/// <param name="sections"></param>
/// <returns></returns>
public static string GetValue(params string[] sections)
{
try
{
if (sections.Any())
return Configuration[string.Join(":", sections)];
}
catch (Exception)
{ }
return "";
}
/// <summary>
/// 递归获取配置信息数组
///引用 Microsoft.Extensions.Configuration.Binder 包
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="sections"></param>
/// <returns></returns>
public static List<T> App<T>(params string[] sections)
{
List<T> list = new List<T>();
Configuration.Bind(string.Join(":", sections), list);
return list;
}
}ConfigureServices中配置
services.AddSingleton(new AppSettings(Configuration));获取指定配置
var info = AppSettings.GetValue("Logging", "LogLevel");到此这篇关于.NET Core自定义配置文件的文章就介绍到这了。希望对大家的学习有所帮助，也希望大家多多支持编程网。
