C# 配置文件SQL数据库连接

<appSettings>
<add key="ConnectionString" value="User ID=sa;Password=FE24W1UJNg1QedCl+4dKFw==;Initial Catalog=GD_SMAS;Data Source=DBServerName;Connect Timeout=30;"/>
</appSettings>

public static string STR_CONNECTION(string database)
{
var str = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"].Split(';');
if (str[2].Split('=')[1] != database)
str = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"].Replace(str[2].Split('=')[1], database).Split(';');
str[1] = "Password=" + new myDlls.DataEncrypt().Decrypt(str[1].Replace("Password=", ""));
return String.Join(";", str);
}