winform獲取app.config的helper

核心程式碼：

ConfigurationManager.ConnectionStrings["name"].ConnectionString;

把這個類搞進去，每次呼叫帶上name就行

using System.Configuration;

namespace he.Tool
{
    public class ConfigHelper
    {
        public string GetAppConfigByName(string name)
        {
            return ConfigurationManager.ConnectionStrings[name].ConnectionString;
        }
    }
}