当排除列表为空时，此操作也有效。
Linq; public class Program { public static void Main() { List<string> linqList = new List<string>() { "C# programming", "Java programming", "Python programming", "C# development" }; string phrase = "c#"; linqList = linqList.Where(item => !item.ToLower().Contains(phrase.ToLow...
使用一个通用的IEqualityComparer，它的工作是比较流程中涉及的示例的Name属性，这样做会容易得多。因此，...
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FirstReturns first item in list. LastReturns last item in list. Range (static)Creates list of numbers, within a specified range.start,length AddAdds element to list.item AddRangeAdds each item in given list.items RemoveAtRemoves item from list by index.index ...
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 ToL...
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 >0sel...
Adding Items into Listbox from string Array Adding Items line by line in Radcombobox Adding labels in panel dynamically (and not to a page) Adding Leading Zero to Day and Month Adding multiple items to Dictionary Adding multiple rows to a datatable Adding multiple worksheet to Excel using Ope...
var chars = from c in definitionText select c; int charCount = chars.Count(); Next, we can use a lambda expression to get the number of four-letter words in the Definition text. A lambda expression is similar to an anonymous delegate: 复制 List<string> definitionWords = new List<st...
The following code example demonstrates how to useDistinct<TSource>(IQueryable<TSource>)to return distinct elements from a sequence. C# List<int> ages =newList<int> {21,46,46,55,17,21,55,55}; IEnumerable<int> distinctAges = ages.AsQueryable().Distinct(); Console.WriteLine("Distinct ages...