using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.IO;
public static class Configs
{
private const string DefaultConfigName = "appsettings.json";
public class ConfigCache
{
internal static readonly IConfigurationRoot ConfigRoot = null;
static ConfigCache()
{
try
{
string pathToContentRoot = Directory.GetCurrentDirectory();
string configFilePath = Path.Combine(pathToContentRoot, DefaultConfigName);
if (!File.Exists(configFilePath))
{
throw new FileNotFoundException($"{DefaultConfigName}配置檔案不存在！");
}
//用於構建基於鍵/值的配置設定，以便在應用程式中使用
IConfigurationBuilder builder = new ConfigurationBuilder()
.SetBasePath(pathToContentRoot)//將基於檔案的提供程式的FileProvider設定為PhysicalFileProvider基本路徑
.AddJsonFile(DefaultConfigName, optional: false, reloadOnChange: true)//在構建器的路徑中新增JSON配置提供程式
.AddEnvironmentVariables();//新增讀取的Microsoft.Extensions.Configuration.IConfigurationProvider來自環境變數的配置值
ConfigRoot = builder.Build();
}
catch (Exception)
{
}
finally
{
}
}
}
public static T Get<T>(string name, T defaultValue)
{
if (ConfigCache.ConfigRoot == null)
{
// throw new NullReferenceException("配置檔案載入異常！");
return defaultValue;
}
IConfigurationSection section = ConfigCache.ConfigRoot.GetSection(name);
if (section == null)
{
throw new KeyNotFoundException($"{name}節點不存在！");
}
var config = section.Get<T>();
if (config == null)
return defaultValue;
return config;
}
public static T Get<T>(string name)
{
return Get<T>(name, default);
}
}