检查两个逗号分隔的字符串是否相等（对于内容集）

Question

我有四个字符串，如下所示。尽管它们有不同的字符顺序和逗号后不同的间距——但它们被认为具有same business value。

1. 如何检查所有字符串是否相同（根据上述业务场景）？我有以下代码，但在逗号后有空格的情况下会失败。
2. 有什么比Enumerable.SequenceEqual更好的方法（为此）？

注意：“A,B”将被视为与“B,A,B,A,B”相同

注意：我使用 Visual Studio 2010 和 .Net Framework 4

代码

  string firstString = "A,B,C";
  string secondString = "C,A,B";
  string thirdString = "A,B, C";
  string fourthString = "C, A,B";


  //Set 1 Test
  List<string> firstList = new List<string>(firstString.Split(','));
  List<string> secondLsit = new List<string>(secondString.Split(','));
  bool isStringsSame = Enumerable.SequenceEqual(firstList.OrderBy(t => t), secondLsit.OrderBy(t => t));
  Console.WriteLine(isStringsSame);


  //Set 2 Test
  List<string> thirdList = new List<string>(thirdString.Split(','));
  List<string> fourthList = new List<string>(fourthString.Split(','));
  bool isOtherStringsSame = Enumerable.SequenceEqual(thirdList.OrderBy(t => t), fourthList.OrderBy(t => t));
  Console.WriteLine(isOtherStringsSame);

  Console.ReadLine();

更新：

使用OrdianlIgnoreCase 忽略大小写敏感How to use HashSet<string>.Contains() method in case -insensitive mode?

参考：

1. Best way to check for string in comma-delimited list with .NET?
2. Compare two List<T> objects for equality, ignoring order
3. Why does the IEnumerable<T>.Select() works in 1 of 2 cases ? Can not be inferred from usage
4. What is the shortest code to compare two comma-separated strings for a match?
5. Split a separated string into hierarchy using c# and linq
6. Count matching characters between two strings using LINQ
7. Usinq Linq to select items that is in a semi-comma separated string?
8. Determine whether two or more objects in a list are equal according to some property

Answer 1

你认为 A,B 等于 B,A,B,A,B 吗？如果是这样，您应该使用集合。如果不是，则有序序列是合适的。

编辑：现在我们知道您实际上想要设置相等性：

var set1 = new HashSet<string>(firstString.Split(',').Select(t => t.Trim()));
bool setsEqual = set1.SetEquals(secondString.Split(',').Select(t => t.Trim()));

---

如果我们在设置相等后不是...

要忽略空格，您应该修剪它们。例如：

var firstOrdered = firstString.Split(',')
                              .Select(t => t.Trim())
                              .OrderBy(t => t);
var secondOrdered = secondString.Split(',')
                                .Select(t => t.Trim())
                                .OrderBy(t => t); 
bool stringsAreEqual = firstOrdered.SequenceEqual(secondOrdered);