c＃使用Lambda Expression并行foreach来过滤文件

Question

Parallel.ForEach(Directory.GetFiles(@"c:\DataArchiver\KYEC\", "*.stdf.gz", SearchOption.TopDirectoryOnly)
                .Select(x => new FileInfo(x)).Where(x.length > 100000)
                ,file =>
            {
                Console.WriteLine(file);
            });

我遇到错误：错误2＆＃39; System.Collections.Generic.IEnumerable＆＃39;不包含＆＃39; Where＆＃39;的定义和最好的扩展方法重载＆＃39; System.Linq.Enumerable.Where（System.Collections.Generic.IEnumerable，System.Func）＆＃39;有一些无效的参数C：\ MteProjects \ ThreadPool \ ThreadPool \ Program.cs 70 21 ThreadPool

添加.where（x.length> 100kb）之后

Answer 1

你错过了x =＆gt;在where子句中：

Parallel.ForEach(Directory.GetFiles(@"c:\DataArchiver\KYEC\", "*.stdf.gz", SearchOption.TopDirectoryOnly)
                .Select(x => new FileInfo(x)).Where(x => x.length > 100000)
                ,file =>
            {
                Console.WriteLine(file);
            });