从类库中读取 web.config [英] reading web.config from class library

问题描述

我有两个项目1) 没有接口的类库只有一个 api2) 网络应用程序

从网络应用程序我将调用类库 api

所以我在 web 应用程序中有所有的 web.config 设置，但是当我调试时它总是返回 null 值，这里是代码片段:

 public static string readingDB{得到{字符串结果 = 空；结果 = ConfigurationManager.AppSettings["employeeDB"];//连接字符串if (!string.IsNullOrEmpty(result)){返回结果；}别的{返回 "";//????抛出异常???}}}

我也尝试过，在类库项目中创建一个新的 app.config 并在那里具有相同的 appsettings 但不起作用...

<add name="employeeDB" connectionString="Data Source=servername;Initial Catalog=employee;Persist Security Info=True;User ID=userid;Password=password;"/></applicationSettings><customErrors mode="On"/></配置>

有什么帮助吗?

解决方案

你的语法不正确，应该是

<预><代码><配置><应用设置><add key="employeeDB" value="Data Source=servername;Initial Catalog=employee;Persist Security Info=True;User ID=userid;Password=password;"/></appSettings></配置>

或更准确地说，因为它是一个连接字符串，

<预><代码><配置><连接字符串><add name="employeeDB" connectionString="Data Source=servername;Initial Catalog=employee;Persist Security Info=True;User ID=userid;Password=password;"/></connectionStrings></配置>

由 ConfigurationManager.ConnectionStrings["employeeDB"]

读取

i have two project 1) class library with no inteface just an api 2) web application

from web apps i will be calling the class library api

so i have all the web.config settings in the web application but when i debug it always return me null value and here is the code snippit:

 public static string readingDB
        {
            get
            {
                string result = null;
                result = ConfigurationManager.AppSettings["employeeDB"]; //conn string
                if (!string.IsNullOrEmpty(result))
                {
                    return result;
                }
                else
                {
                    return "";  //???? THROW EXCEPTION???
                }
            }
        }

i have also tried, creating a new app.config in the class library project and have the same appsettings there but does not work...

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <applicationSettings>
    <add name="employeeDB" connectionString="Data Source=servername;Initial Catalog=employee;Persist Security Info=True;User ID=userid;Password=password;"/>
  </applicationSettings>
  <customErrors mode="On"/>
</configuration>

any help?

解决方案

your syntax is incorrect, it should be

<configuration>  
  <appSettings>  
    <add key="employeeDB" value="Data Source=servername;Initial Catalog=employee;Persist Security Info=True;User ID=userid;Password=password;"/> 
  </appSettings>  
</configuration>  

or more correctly, since it's a connection string,

<configuration>  
  <connectionStrings>  
    <add name="employeeDB" connectionString="Data Source=servername;Initial Catalog=employee;Persist Security Info=True;User ID=userid;Password=password;"/>  
  </connectionStrings>  
</configuration>  

which would be read by ConfigurationManager.ConnectionStrings["employeeDB"]

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