C#WinForm中常用技术

C#WinForm中按钮响应回车事件的简单方法
Winform中的按钮要响应回车事件,是很简单的事情!只要在窗体中的属性设置一下就可以了!
比如有登录窗体(Form_Login),包含有两个按钮登录 (btnLogin)和退出(btnExit),
想要登录 (btnLogin)响应回车键,则设置窗体(Form_Login)的属性AcceptButton为btnLogin即可!
即Form_Login.AcceptButton=btnLogin; 同样道理,
设置窗体(Form_Login)的属性CancelButton为btnExit,就可以响应Esc键了!
即Form_Login.CancelButton=btnExit;
 
读取和配置App.config文件,下面以配置IP地址为例。
新建一个类AppSettings

   public class AppSettings
    {
        public static string AppConfig()
        {
            return System.IO.Path.Combine(Application.StartupPath, "App.config");//此处配置文件在程序目录下
        }

        public static string GetValue(string appKey)
        {
            XmlDocument xDoc = new XmlDocument();
            try
            {
                xDoc.Load(AppSettings.AppConfig());
                XmlNode xNode;
                XmlElement xElem;
                xNode = xDoc.SelectSingleNode("//appSettings");    //补充,需要在你的app.config 文件中增加一下,<appSetting> </appSetting>
                xElem = (XmlElement)xNode.SelectSingleNode("//add[@key='" + appKey + "']");
                if (xElem != null)
                    return xElem.GetAttribute("value");
                else
                    return "";
            }
            catch (Exception)
            {
                return "";
            }
        }

        public static void SetValue(string AppKey, string AppValue)
        {
            XmlDocument xDoc = new XmlDocument();
            xDoc.Load(AppSettings.AppConfig());
            XmlNode xNode;
            XmlElement xElem1;
            XmlElement xElem2;
            xNode = xDoc.SelectSingleNode("//appSettings");
            xElem1 = (XmlElement)xNode.SelectSingleNode("//add[@key='" + AppKey + "']");
            if (xElem1 != null)
            {
                xElem1.SetAttribute("value", AppValue);
            }
            else
            {
                xElem2 = xDoc.CreateElement("add");
                xElem2.SetAttribute("key", AppKey);
                xElem2.SetAttribute("value", AppValue);
                xNode.AppendChild(xElem2);
            }
            xDoc.Save(AppSettings.AppConfig());
        }

    }

     private void btnSaveIP_Click(object sender, EventArgs e)
        {
            string strIP = txtIP.Text;
            if (!string.IsNullOrEmpty(strIP))
            {
                AppSettings.SetValue("IPString",strIP);
                MessageBox.Show("IP配置成功!");
            }
        }
  public static string AppConfig()
        {
            return System.IO.Path.Combine(Application.StartupPath, "App.config");//此处配置文件在程序目录下
        }

最后不要忘了将App.config文件拷贝到Bin/Debug目录下面


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