学步园

从进程列表中查找在指定的（存放在string数组中）进程：

string processList = ConfigurationManager.AppSettings["CheckProcessList"];<br /> string[] aryProcessList = processList.ToLower().Split(new char[] { ';', ','});</p> <p> Process[] curProcesslist = Process.GetProcesses();<br /> //Use LINQ to query the object<br /> var downProcess =<br /> from process in aryProcessList<br /> join processCur in curProcesslist<br /> on process equals processCur.ProcessName.ToLower()+".exe" into newProcessList<br /> from newprocess in newProcessList.DefaultIfEmpty()<br /> select new<br /> {<br /> ProcessName = process,<br /> ProcessInfo = newprocess == default(Process) ? null : newprocess<br /> };

LINQ to Entities 中查询有些区别：

var books = from SofTextBook stb in psciEntities.SofTextBook<br /> from SofPublisher sp in psciEntities.SofPublisher<br /> from SofGrade sg in psciEntities.SofGrade<br /> where (sg.ID == stb.GradeID) && (sp.ID == stb.PublisherID)<br /> orderby stb.PublisherID, stb.GradeID<br /> select new<br /> {<br /> BookName = stb.Title,<br /> PublishName = sp.PublishName,<br /> GradeName = sg.GradeName,<br /> BookID = stb.ID<br /> };<br /> var booksList = from book in books.AsEnumerable()<br /> select new<br /> {<br /> BookTitle = book.PublishName + '-' + book.GradeName + '-' + book.BookName,<br /> BookID = book.BookID<br /> };

真省事：

bool isExists = true;<br /> var c = (from content in BLLFactory.BookBll.GetContents(articleId)<br /> where content.ContentType == contentType<br /> select content).FirstOrDefault();<br /> if(c == null)<br /> {<br /> c = new Content();<br /> c.Id = Guid.NewGuid();<br /> isExists = false;<br /> }

顺便记个数组中查找及组合元素的：

pbReading.VoiceRecorder.Photo = lstImages.Find(delegate(string s) { return s.IndexOf(recorderName) > -1; });<br /> string phIndex = selectedLables.Select(i => ((string[])i.Tag)[1]).Aggregate((a, b) => a + "," + b); ;