从 App.config 获取连接字符串 [英] Get connection string from App.config

问题描述

var connection = ConnectionFactory.GetConnection(
    ConfigurationManager.ConnectionStrings["Test"]
    .ConnectionString, DataBaseProvider);

这是我的 App.config:

And this is my App.config:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <connectionStrings>
        <add name="Test" connectionString="Data Source=.;Initial Catalog=OmidPayamak;Integrated Security=True" providerName="System.Data.SqlClient" />
    </connectionStrings>
</configuration>

但是当我的项目运行时，这是我的错误:

But when my project runs this is my error:

未将对象引用设置为对象的实例.

Object reference not set to an instance of an object.

推荐答案

难道你不能只做以下几点:

Can't you just do the following:

var connection = 
    System.Configuration.ConfigurationManager.
    ConnectionStrings["Test"].ConnectionString;

您的程序集还需要对 System.Configuration.dll

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