c# - 如何将一个集合分成不同的 "buckets"

Question

我有一组 C# 对象。对于数据成员，每个对象都有一个 guid 字符串、一个 int 索引和一个文档名称字符串。这是一个典型的集合的样子:

"guid1","c:\temp\doc1.docx",1
"guid1","c:\temp\doc2.docx",2
"guid1","c:\temp\doc3.docx",3
"guid1","c:\temp\doc4.docx",4
"guid2","c:\temp\doc5.docx",5
"guid1","c:\temp\doc6.docx",6
"guid1","c:\temp\doc7.docx",7


I need to end up breaking the collection into individual collections like this:

"guid1","c:\temp\doc1.docx",1
"guid1","c:\temp\doc2.docx",2
"guid1","c:\temp\doc3.docx",3
"guid1","c:\temp\doc4.docx",4


"guid2","c:\temp\doc5.docx",5


"guid1","c:\temp\doc6.docx",6
"guid1","c:\temp\doc7.docx",7

然后，这些单独的集合将被送入另一个函数进行处理。试图找出执行此操作的最佳方法。

Answer 1

尝试使用 Linq，GroupBy:

 IEnumerable<MyClass> source = ...;

 int group = 0;
 Guid key = new Guid(); 

 // Let's have an array of arrays (array of individual collections) as a result
 MyClass[][] buckets = source
   .GroupBy(item => {
      if (group == 0 || key != item.guid) {
        key = item.guid;
        group += 1; 
      } 

      return group; })
   .Select(chunk => chunk.ToArray()) 
   .ToArray();