C#读取App.config/Web.config

时间:2021-04-18 17:26:51

读取需要添加 System.Configuration 引用,

两种方式添加:

1:.NETFramework程序可以在引用右击添加引用,然后添加System.Configuration

2:引入Nuget 包:Install-Package   System.Configuration.ConfigurationManager

实例如下:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<appSettings>
<add key="a" value="A"/>
<add key="b" value="B"/>
<add key="c" value="C"/>
</appSettings>
<connectionStrings>
<add name="MSSQL" connectionString="Server..." providerName=""/>
<add name="MYSQL" connectionString="Server....." providerName=""/>
</connectionStrings>
</configuration>

App.config

using System;
using System.Configuration; namespace ConsoleApp2
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine(ConfigurationManager.AppSettings["a"]);
Console.WriteLine(ConfigurationManager.AppSettings["b"]);
Console.WriteLine(ConfigurationManager.AppSettings["c"]);
Console.WriteLine();
Console.WriteLine(ConfigurationManager.ConnectionStrings["MSSQL"].ConnectionString);
Console.WriteLine(ConfigurationManager.ConnectionStrings["MSSQL"].ProviderName);
Console.WriteLine();
Console.WriteLine(ConfigurationManager.ConnectionStrings["MYSQL"].ConnectionString);
Console.WriteLine(ConfigurationManager.ConnectionStrings["MYSQL"].ProviderName);
}
}
}

读取App.config

//Asp.Net应用程序(MVC)读取Web.config
string name = System.Web.Configuration.WebConfigurationManager.AppSettings["name"];

读取Web.config