c# - 无法从应用程序配置读取连接字符串

Question

这是我在 App.config 中的连接字符串

<connectionStrings>
<add name="CostAllocationEntities2" connectionString="Data Source=PC210090\SQLEXPRESS; Initial Catalog=master;Persist Security Info=True;
         User ID=sa;password=password-1;multipleactiveresultsets=True; " providerName="System.Data.SqlClient"/>

</connectionStrings>

     ServerConnection connection = new ServerConnection(ConfigurationManager.ConnectionStrings["CostAllocationEntities2"].ConnectionString);

                    Server sqlServer = new Server(connection);

                    Database db = sqlServer.Databases[strDBName];

Exception : Failed to connect to server Data Source=PC210090\SQLEXPRESS; Initial Catalog=master;Persist Security Info=True; User ID=sa;password=password-1;multipleactiveresultsets=True; .

Answer 1

您想做什么，不确定，但更改您的连接字符串

connectionString="数据源=PC210090\\SQLEXPRESS;

初始目录=master;;不要连接到 master 数据库，而是提供一个用户数据库名称，例如 Sample。

<connectionStrings>
<add name="CostAllocationEntities2" connectionString="Data Source=PC210090\\SQLEXPRESS; Initial Catalog=Sample;Persist Security Info=True; User ID=test;password=test;multipleactiveresultsets=True; " providerName="System.Data.SqlClient"/>
</connectionStrings>

在你的代码后面

获得连接字符串后，创建一个 SqlConnection 实例，例如

SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["CostAllocationEntities2"].ConnectionString);

打开连接

connection.Open();