int[] arr =new[] {1,2,3};varr =fromiteminarrwhereitem >0orderbyitem descendingselectitem; 而c#开源库UniRx拿这些关键字做了一些非集合查询的自定义操作: //composing asynchronous sequence with LINQ query expressionsvarquery =fromgoogleinObservableWWW.Get("http://google.com/")frombinginObservable...
publicstaticasyncTask<IEnumerable<TResult>>SelectAsync<TSource,TResult>(thisIEnumerable<TSource> source, Func<TSource, Task<TResult>> method){returnawaitTask.WhenAll(source.Select(asyncs =>awaitmethod(s))); } like this: varresult =awaitsourceEnumerable.SelectAsync(asyncs=>awaitsomeFunction(s,oth...
var names = await context.Users .Where(u => u.IsActive) .OrderBy(u => u.Name) .Select(u => u.Name) .ToListAsync(); return names; } } 在上述示例中,GetNamesAsync方法使用await关键字等待LINQ查询结果的异步返回。ToListAsync方法是Entity Framework提供的异步方法,它会在后台执行查询并返回结果。
ValueTask<bool>>predicate) { returnCore(); asyncIAsyncEnumerable<T>Core([EnumeratorCancellation]CancellationTokencancellationToken=default) { awaitforeach(variteminsource.WithCancellation(cancellationToken).ConfigureAwait(false)) { if(awaitpredicate(item).ConfigureAwait(false)) { yieldreturnitem; } } } }...
var result = (from d1 in dataset1 join d2 in dataset2 on d1.Key equals d2.Key where d1.SomeProperty == "SomeValue" select new { d1, OtherProperty = d2.OtherProperty }).ToList(); 说明:虽然方法语法通常更简洁,但查询语法可以增强可读性,尤其是对于涉及联接、where 和 select 语句的复杂...
Demo","*.cs","using").Select(staticasynci=>(File:i.File,Result:awaiti.Result.ToListAsync()...
public static async Task Main() { var numbers = Enumerable.Range(1, 10); var result = await Task.Run(() => { return numbers .Where(n => IsEvenAsync(n).Result) .Select(n => DoubleAsync(n).Result) .ToList(); }); foreach (var number in result) ...
select student.Name; 1. 2. 3. 2.2 方法语法 使用方法链式调用标准查询运算符,如Where、Select、OrderBy等: var result = students.Where(student => student.Age > 18) .Select(student => student.Name); 1. 2. 2.3 排序 使用OrderBy或OrderByDescending进行升序或降序排序: ...
[HttpGet()][HttpPost()]publicasyncTask<IActionResult>UploadFile(参数1,参数2...){returnawaitTask.Run(()=>{try{业务逻辑。。。}catch(Exceptionex){varresult=new{result=false,message=ex.Message};returnContent(JsonConvert.SerializeObject(result),"text/html;charset=utf-8");}});} linq 查询...
varfiles=Directory.EnumerateFiles(rootpath);varresults=fromfileinfilesfromresultinSerachText(file)select...