从App.config获取连接字符串 [英] Get connection string from App.config
本文介绍了从App.config获取连接字符串的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
var connection = ConnectionFactory.GetConnection(
ConfigurationManager.ConnectionStrings [Test]
.ConnectionString,DataBaseProvider);
这是我的App.config:
< pre class =lang-xml prettyprint-override>
<?xml version =1.0encoding =utf-8?>
< configuration>
< connectionStrings>
< add name =TestconnectionString =Data Source =; Initial Catalog = OmidPayamak; Integrated Security = TrueproviderName =System.Data.SqlClient/>
< / connectionStrings>
< / configuration>
但是当我的项目运行这是我的错误:
对象引用未设置为对象的实例。
解决方案
您不能只执行以下操作:
var connection =
System.Configuration.ConfigurationManager 。
ConnectionStrings [Test]。ConnectionString;
您的程序集还需要引用 System.Configuration.dll
var connection = ConnectionFactory.GetConnection(
ConfigurationManager.ConnectionStrings["Test"]
.ConnectionString, DataBaseProvider);
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>
But when my project runs this is my error:
Object reference not set to an instance of an object.
解决方案
Can't you just do the following:
var connection =
System.Configuration.ConfigurationManager.
ConnectionStrings["Test"].ConnectionString;
Your assembly also needs a reference to System.Configuration.dll
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