var multiColQuery = from line in strs let elements = line.Split(',') let scores = elements.Skip(1) select (from str in scores select Convert.ToInt32(str)); // Execute the query and cache the results to improve // performance. // ToArray could be used instead of ToList....
stringstartFolder ="""C:\Program Files\dotnet\sdk""";// Or// string startFolder = "/usr/local/share/dotnet/sdk";varfileList = Directory.GetFiles(startFolder,"*.*", SearchOption.AllDirectories);varfileQuery =fromfileinfileListletfileLen =newFileInfo(file).LengthwherefileLen >0se...
static void SelectVsSelectMany() { List<Bouquet> bouquets = new List<Bouquet>() { new Bouquet { Flowers = new List<string> { "sunflower", "daisy", "daffodil", "larkspur" }}, new Bouquet{ Flowers = new List<string> { "tulip", "rose", "orchid" }}, new Bouquet{ Flowers = new ...
1var query=from item1inlist12 join item2inlist2 on item1 equals item23selectitem2;4var query3=list1.Join(5list2,6 item1=>item1,7 item2=>item2,8 (item1,item2)=>item29 ); Enumerable<T>.Join()使用的是INNER JOIN的概念,当TInner.Key和TOuter.Key相同时,才会将元素输出到resultSelector...
() where c.active select c).ToList();/*C#写法3*/IEnumerable JointList = ( from r1 in list...( inner: salaryList, /*因为比较器用到了name和occupation两个属性,所以这里的Selector要包含这两个有用的属性值...在数据库或其他数据源操作中,Join操作使得从多个表中组合数据变得可能,极大...
List<string> listLoadMouldNo = listAllLoad.Select(m => m.MouldNo).ToList(); //查询出了listAllLoad中MouldNo元素,并放入另一个List. 2.筛选出List中符合条件的,放入另一个List List<DMDXSeg> lstSeg = listAllDMDX.Where(m => m.SegCode == 1012).ToList(); ...
Select用法varselectedItems =fromiteminitemswhereitem.ParentID == parentIDorderbyitem.SortIndex descending ,item.Name ascendingselectitem;0.1where:varlist=collection.Where(t => (txtCustomerName.Text.Trim().Length ==0|| t.ClientName.ToUpper().IndexOf(txtCustomerName.Text.Trim().ToUpper()) >=0...
所选子集合中的字段可以是静态的,但是我希望动态地传递当前实体中的字段列表,以及导航属性引用的其他实体中的字段。下面是查询的静态版本,类似于我在代码中使用的查询,在很多地方,我想动态地创建这个查询: var listItems = _efDbContext.Blogs.Select(x => new {Ivan的答案确实很酷,但它不支持引...
// int overloadpublicstaticdoubleMedian(thisIEnumerable<int> source)=> (fromnumberinsourceselect(double)number).Median(); 您現在可以呼叫integer和double類型的Median多載,如下列程式碼所示︰ C# double[] numbers1 = [1.9,2,8,4,5.7,6,7.2,0];varquery1 = numbers1.Median(); Console.WriteLine($"...
' Returns a combined collection of all of the' processes currently running and a descriptive' name for the process taken from a list of' descriptive names.Dimprocesses =FromprocInProcess.GetProcessesJoindescInprocessDescriptionsOnproc.ProcessNameEqualsdesc.ProcessNameSelectproc.ProcessName, proc.Id, ...