(file).LengthwherefileLen >0selectfileLen;// Cache the results to avoid multiple trips to the file system.long[] fileLengths = fileQuery.ToArray();// Return the size of the largest filelonglargestFile = fileLengths.Max();// Return the total number of bytes in all the fil...
(file).LengthwherefileLen >0selectfileLen;// Cache the results to avoid multiple trips to the file system.long[] fileLengths = fileQuery.ToArray();// Return the size of the largest filelonglargestFile = fileLengths.Max();// Return the total number of bytes i...
{"Dusty"} } };// Project the items in the array by appending the index// of each PetOwner to each pet's name in that petOwner's// array of pets.IEnumerable<string> query = petOwners.SelectMany((petOwner, index) => petOwner.Pets.Select(pet => index + pet));foreach(stringpetin...
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(file).LengthwherefileLen >0selectfileLen;// Cache the results to avoid multiple trips to the file system.long[] fileLengths = fileQuery.ToArray();// Return the size of the largest filelonglargestFile = fileLengths.Max();// Return the total number of bytes in all the files...
{ static void Main() { string[] names = { "Burke", "Connor", "Frank", "Everett", "Albert", "George", "Harris", "David" }; IEnumerable<string> query = from s in names where s.Length == 5 orderby s select s.ToUpper(); foreach (string item in query) Console.WriteLine(item)...
Values = groupedItems.Select(x => x.Value) }; 在这个示例中,leftList和rightList是两个数据源,它们通过Key字段进行连接。使用join关键字进行连接操作,并使用into关键字将结果存储在一个临时列表中。然后,使用from关键字和DefaultIfEmpty()方法来处理左连接中可能出现的null值。最后,使用group by关键字将结果...
linq:thenByDescending(selector, [comparer])linq:unique()linq:uniqueBy(selector)linq:skip(count)This operator skips the specified number of items in a sequence, yielding only the remaining values:local seq = linq { "a", "b", "c", "d" }:skip(2) -- seq is now equivalent to linq { ...
This is reasonable if you are returning multiple items, but what about cases where you query for one particular item—for example, the contact whose ContactID is 63—and you don’t want to have an IQueryable returned, but just the item?
To demonstrate adding new 1:M relationships, add a couple of new books without a category. UseInsertAllOnSubmit()to add multiple records at once, andSubmitChanges()to persist them to the database: C# IEnumerable<Book> books =newList<Book>( ){newBook( ){ Title ="Essential Windows Presentatio...