c# net6 讀取appsettings.json方法

中国结發表於2024-08-07
C#APPJSON

如圖：

一、appsettings.json

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "SqlServer": {
    "Server": "192.168.1.10",
    "Database": "dbname",
    "UserId": "userid",
    "Password": "password"
  }
}

二、AppHepler.cs

   public class AppHelper
    {
        private static IConfiguration _config;

        public AppHelper(IConfiguration configuration)
        {
            _config = configuration;
        }

        /// <summary>
        /// 讀取指定節點的字串
        /// </summary>
        /// <param name="sessions"></param>
        /// <returns></returns>
        public static string ReadAppSettings(params string[] sessions)
        {
            try
            {
                if (sessions.Any())
                {
                    return _config[string.Join(":", sessions)];
                }
            }
            catch
            {
                return "";
            }
            return "";
        }

        /// <summary>
        /// 讀取實體資訊
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="session"></param>
        /// <returns></returns>
        public static List<T> ReadAppSettings<T>(params string[] session)
        {
            List<T> list = new List<T>();
            _config.Bind(string.Join(":", session), list);
            return list;
        }
    }

三、Program.cs

using ElecInvoice.Common;
using log4net.Config;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

//讀取 appsettings.json
IConfiguration configuration = new ConfigurationBuilder().AddJsonFile("appsettings.json").Build();
builder.Services.AddSingleton(new AppHelper(configuration));//AppHelper為讀取appsettings.json的實體類

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

// 配置 log4net  
XmlConfigurator.Configure(new FileInfo("log4net.config"));

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();

四、用法 SqlDB.cs

    public class SqlDB
    {
        public static string sqlStr = @$"
                                        Server={AppHelper.ReadAppSettings("SqlServer:Server")};
                                        Database={AppHelper.ReadAppSettings("SqlServer:Database")};
                                        User Id={AppHelper.ReadAppSettings("SqlServer:UserId")};
                                        Password={AppHelper.ReadAppSettings("SqlServer:Password")};";

        public static DataTable Query(string sql)
        {
            try
            {
                using (SqlConnection conn = new SqlConnection(sqlStr))
                {
                    conn.Open();
                    SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);
                    DataTable dt = new DataTable();
                    adapter.Fill(dt);
                    return dt;
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }

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