编写简单的 Parallel.ForEach 循环

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代码片段(2) [全屏查看所有代码]

1.[代码][C#]代码

using System; using System.Drawing; // requires system.Drawing.dll using System.IO; using System.Threading; using System.Threading.Tasks; class SimpleForEach { static void Main() { // A simple source for demonstration purposes. Modify this path as necessary. string[] files = Directory.GetFiles(@"C:\Users\Public\Pictures\Sample Pictures", "*.jpg"); string newDir = @"C:\Users\Public\Pictures\Sample Pictures\Modified"; Directory.CreateDirectory(newDir); // Method signature: Parallel.ForEach(IEnumerable<TSource> source, Action<TSource> body) parallel.foreach(files, currentFile => { // The more computational work you do here, the greater // the speedup compared to a sequential foreach loop. string filename = Path.GetFileName(currentFile); Bitmap bitmap = new Bitmap(currentFile); bitmap.RotateFlip(RotateFlipType.Rotate180FlipNone); bitmap.Save(Path.Combine(newDir, filename)); // Peek behind the scenes to see how work is parallelized. // But be aware: Thread contention for the Console slows down parallel loops!!! Console.WriteLine("Processing {0} on thread {1}", filename, Thread.CurrentThread.ManagedThreadId); } //close lambda expression ); //close method invocation // Keep the console window open in debug mode. Console.WriteLine("Processing complete. Press any key to exit."); Console.ReadKey(); } }

2.[代码]要将 ForEach 用于非泛型集合，可以使用 Cast

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