我们可以在“app.config"文件中声明变量吗?

Can we declare variables in the #39;app.config#39; file?(我们可以在“app.config文件中声明变量吗?)

问题描述

我有一个需要连接到 SQL Server 的表单，我有一个用于选择数据库列表和执行主键检查等操作的下拉菜单.

I have a form which needs to get connected to SQL Server, and I have a drop down for selecting the list of databases and perform operations like primary key checking, etc.

但目前我的连接字符串如下所示:

But presently my connection string looks like this:

SqlConnection sConnection = new SqlConnection("Server=192.168.10.3;DataBase=GoalPlanNew;User Id=gp;Password=gp");

但是除了给定的数据库之外，我还需要将它作为变量，以便我可以将它连接到我从下拉列表中选择的数据库.

But apart from the given database, I need to take it variable, so that I can connect it to the database I select from the dropdown.

我该怎么做?

推荐答案

嗯，你可以像这样声明你的变量

Hmm you can declare your variables like this

<appSettings>
    <add key="SmtpServerHost" value="********" />
    <add key="SmtpServerPort" value="25" />
    <add key="SmtpServerUserName" value="******" />
    <add key="SmtpServerPassword" value="*****" />
</appSettings>

读起来像

string smtpHost = ConfigurationManager.AppSettings["SmtpServerHost"];
int smtpPort = Convert.ToInt32(ConfigurationManager.AppSettings["SmtpServerHost"]);

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