framework配置文件读取

写在 app.config 里面

<?xml version="1.0" encoding="utf-8" ?>
<configuration>

	<!-- 运行环境 -->
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
    </startup>
	
	
	<!-- 配置连接字符串 -->
	<connectionStrings>
		<add name="conStr" connectionString="Data Source = WINGEL; Initial Catalog = People; Trusted_connection = SSPI"/>
	</connectionStrings>
</configuration>

添加 System.Configuration 引用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Configuration; // 引入配置信息
using System.Data.SqlClient;

namespace Dome13_Framework配置文件读取
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // ConfigurationManager 配置信息管理者  ConnectionStrings[] 获取连接字符串
            // 再用 .ConnectionString 转变成string类型

            string conStr = ConfigurationManager.ConnectionStrings["conStr"].ConnectionString;

            using (SqlConnection conn = new SqlConnection(conStr))
            {
                conn.Open();
                Console.WriteLine("连接成功");
            }
        }
    }
}