LINQPad 应用

https://www.linqpad.net/

使用 LINQPad 调试linq以及lambda表达式

http://www.studyofnet.com/news/1168.html

linq 转化XML , 可以方便地把XML导出为CSV

var path = @"d:\temp\note.xml";
var doc = XDocument.Load(path);
doc.Dump();

var q = from x in doc.Elements()
select new {
name=x.Attribute("name").Value
,to=x.Elements("to").FirstOrDefault().Value
,fromcol=x.Elements("from").FirstOrDefault().Value
,heading=x.Elements("heading").FirstOrDefault().Value
,body=x.Elements("body").FirstOrDefault().Value
};

q.Dump();

linq查询EventLog

string eventLogLocation = @"d:\temp\Application.evtx";
//var query = new EventLogQuery("Application", PathType.LogName, "*[System/Level=2]");
string queryString = "*"; // XPATH Query
EventLogQuery eventsQuery = new EventLogQuery(eventLogLocation, PathType.FilePath, queryString);
EventLogReader logReader = new EventLogReader(eventsQuery);

for (EventRecord eventInstance = logReader.ReadEvent();
    null != eventInstance; eventInstance = logReader.ReadEvent())
{
	//if(eventInstance.FormatDescription().Contains("SuanMing")){
	    // Display event info
	    Console.WriteLine("-----------------------------------------------------");
		 Console.WriteLine("TimeCreated: {0}",eventInstance.TimeCreated.ToString());
	    Console.WriteLine("Event ID: {0}", eventInstance.Id);
	    Console.WriteLine("Publisher: {0}", eventInstance.ProviderName);
	    Console.WriteLine("Description: {0}", eventInstance.FormatDescription());
		String eventXml = eventInstance.ToXml();
		Console.WriteLine(eventXml);
	//}

}