修改App.config的键和值 _config

丈夫欲遂平生志，一载寒窗一举汤。这篇文章主要讲述修改App.config的键和值相关的知识，希望能为你提供帮助。
App.config中内容：

< ?xml version="1.0" encoding="utf-8" ?> < configuration> < !--< system.windows.forms jitDebugging="true"//允许调试/> --> < appSettings> < add key="setInterval" value="https://www.songbingjia.com/android/1000"/> < add key="chooseCOM" value="https://www.songbingjia.com/android/COM4"/> < add key="senStr" value="https://www.songbingjia.com/android/R"/> < /appSettings> < /configuration>

【修改App.config的键和值】读取App.config中chooseCOM内容,并把COM4改为COM1：

string setCOM = ConfigurationSettings.AppSettings["chooseCOM"]; ConfigHelper.SetValue("chooseCOM","COM1"); //

设置app.config键值的方法：

public static class ConfigHelper { public void SetValue(String AppKey, String AppValue) { XmlDocument xDoc = new XmlDocument(); xDoc.Load(System.Windows.Forms.Application.ExecutablePath + ".config"); 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(System.Windows.Forms.Application.ExecutablePath + ".config"); } }