developer/Samples/NET Standard/ParallelExtensionsExtras_Standard/ParallelAlgorithms/ParallelAlgorithms_Map.cs

   1 //--------------------------------------------------------------------------
   2 //
   3 //  Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 //  File: ParallelAlgorithms_Map.cs
   6 //
   7 //--------------------------------------------------------------------------
   8
   9 using System.Collections.Generic;
  10 using System.Threading.Tasks;
  11
  12 namespace System.Threading.Algorithms
  13 {
  14     public static partial class ParallelAlgorithms
  15     {
  16         /// <summary>Executes a map operation, converting an input list into an output list, in parallel.</summary>
  17         /// <typeparam name="TInput">Specifies the type of the input data.</typeparam>
  18         /// <typeparam name="TOutput">Specifies the type of the output data.</typeparam>
  19         /// <param name="input">The input list to be mapped used the transform function.</param>
  20         /// <param name="transform">The transform function to use to map the input data to the output data.</param>
  21         /// <returns>The output data, transformed using the transform function.</returns>
  22         public static TOutput[] Map<TInput, TOutput>(IList<TInput> input, Func<TInput, TOutput> transform)
  23         {
  24             return Map(input, s_defaultParallelOptions, transform);
  25         }
  26
  27         /// <summary>Executes a map operation, converting an input list into an output list, in parallel.</summary>
  28         /// <typeparam name="TInput">Specifies the type of the input data.</typeparam>
  29         /// <typeparam name="TOutput">Specifies the type of the output data.</typeparam>
  30         /// <param name="input">The input list to be mapped used the transform function.</param>
  31         /// <param name="parallelOptions">A ParallelOptions instance that configures the behavior of this operation.</param>
  32         /// <param name="transform">The transform function to use to map the input data to the output data.</param>
  33         /// <returns>The output data, transformed using the transform function.</returns>
  34         public static TOutput[] Map<TInput, TOutput>(IList<TInput> input, ParallelOptions parallelOptions, Func<TInput, TOutput> transform)
  35         {
  36             if (input == null) throw new ArgumentNullException("input");
  37             if (parallelOptions == null) throw new ArgumentNullException("parallelOptions");
  38             if (transform == null) throw new ArgumentNullException("transform");
  39
  40             var output = new TOutput[input.Count];
  41             Parallel.For(0, input.Count, parallelOptions, i => output[i] = transform(input[i]));
  42             return output;
  43         }
  44     }
  45 }