C # read-write configuration file (XML file)

The. xml file format is as follows

<?xml version= "1.0" encoding= "Utf-8"?> <! DOCTYPE dataaccess[]> <DataAccess> <appSettings> <add key= "StartTime" value= "9"/> <add "key=" Endtime "value=" 6 "/> </appSettings> </DataAccess>

C # Initialization

private static XmlDocument Xmliauconfig; Static ConfigManager () {xmliauconfig = new XmlDocument (); Xmlpath = assembly.getexecutingassembly (). CodeBase; Int32 i = xmlpath.lastindexof ("/"); Xmlpath = Xmlpath.remove (i); Xmlpath = Xmlpath + @ "/abc.xml"; Xmliauconfig.load (Xmlpath); }

Gets the value of a node

public static string GetValue (String key) {xmliauconfig.load (Xmlpath); String value; String path = @ "//dataaccess/appsettings/add[@key = '" + key + "']"; XmlNodeList Xmladds = xmliauconfig.selectnodes (path); if (Xmladds.count = = 1) {XmlElement xmladd = (XmlElement) xmladds[0]; value = Xmladd.getattribute ("value");} else {throw New Exception ("Iauconfig configuration Information set error: The key value is" + key + "element is not equal to 1"); return value; }

Modify a node for a value

public static void Savaconfig (String strkey, String strvalue) {XmlDocument xmldoc = new XmlDocument (); Xmldoc.load ("Abc.xml"); XmlNodeList list = Xmldoc.getelementsbytagname ("add"); for (int i = 0; i < list. Count; i++) {if (List[i]. Attributes[0]. Value = = strkey) {List[i]. ATTRIBUTES[1]. Value = strvalue; } StreamWriter Swriter = new StreamWriter ("Abc.xml"); XmlTextWriter XW = new XmlTextWriter (Swriter); Xw. formatting = formatting.indented; Xmldoc.writeto (XW); Xw. Close (); Swriter. Close (); }