30秒学会 C# 片段 – SymmetricDifference

Returns the symmetric difference betweend two collections.

Use IEnumerable.Except() to only return elements in one enumerable object and not the other.
Use IEnumerable.Union() to combine the result of applying that to each object.

代码实现

using System.Collections.Generic;
using System.Linq;

public static partial class _30s 
{
  public static IEnumerable<T> SymmetricDifference<T>(IEnumerable<T> a, IEnumerable<T> b) 
  {
    return a.Except(b).Union(b.Except(a));
  }
}

使用样例

int[] a = { 1, 2, 3, 5 };
int[] b = { 1, 2, 4 };

_30s.SymmetricDifference(a, b); // { 3, 5, 4 }