c# - 在 C# winform 中使用 app.config 访问数据库连接字符串

Question

我似乎无法访问我的 c# winforms 应用程序中的 app.config 数据库连接字符串。

app.config代码

   <connectionStrings>
      <add name="MyDBConnectionString" providerName="System.Data.SqlClient"
            connectionString="Data Source=localhost;Initial Catalog=MySQLServerDB; Integrated Security=true" />
   </connectionStrings>  

C#代码:

SqlConnection conn = new SqlConnection();
conn.ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["MyDBConnectionString"];    

当我尝试 C# 代码时，我收到一条消息:
警告 1“System.Configuration.ConfigurationSettings.AppSettings”已过时:“ 此方法已过时，已被 System.Configuration!System.Configuration.ConfigurationManager.AppSettings 取代

但是，当我尝试使用时:

conn.ConnectionString = System.Configuration!System.Configuration.ConfigurationManager.AppSettings["MyDBConnectionString"];  

我得到一个错误:Only assignment, call, increment, decrement, and new object expressions can be used as a statement

Answer 1

这就是你所需要的:

System.Configuration.ConfigurationManager.ConnectionStrings["MyDBConnectionString"].ConnectionString;