Question

我有重复值的字典。如何将这些重复的值合并为一个值示例：

 Accord - first
 Accord.s - first

我想看到类似的东西：

 Accord, Accord.s - first

Answer 1

如果我没听错，您有字典

Dictionary<string, string> source = new Dictionary<string, string>() {
  {"Accord", "first"},
  {"Accord.s", "first"},
  {"Gamma", "second"}, 
};

，您想按Value 分组，可以在 Linq 的帮助下完成：

 using System.Linq;

 ...

 // If you want to create a dictionary:
 Dictionary<string, string> result = source
   .GroupBy(pair => pair.Value)
   .ToDictionary(
      chunk => string.Join(", ", chunk.Select(pair => pair.Key)),
      chunk => chunk.Key);

 string report = string.Join(Environment.NewLine, result
   .Select(pair => $"{pair.Key} : {pair.Value}"));

 Console.Write(report);

结果：

Accord, Accord.s : first
Gamma : second

如果您只想查询（而不是字典）

var result = source
   .GroupBy(pair => pair.Value)
   .Select(chunk => new {
      Key   = string.Join(", ", chunk.Select(pair => pair.Key)),
      Value = chunk.Key});

// and then
string report = string.Join(Environment.NewLine, result
   .Select(pair => $"{pair.Key} : {pair.Value}"));

如何将字典中的重复值合并为一个值

1 个答案: