How can I use Linq to get distinct results filtered by property

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LINQ's Distinct() on a particular property 17 answers

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List<Tool> distinctTool = tools
  .GroupBy(p => p.Number)
  .Select(g => g.OrderByDescending(q => q.Source == "M1").First())
  .ToList();

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您需要按照编号对Tools进行分组，并获取其中的First()

List<Tool> distinctTool = tools
  .GroupBy(p => p.Number)
  .Select(g => g.OrderByDescending(q => q.Source == "M1").First())      
  .ToList();

---

尝试按数字分组并获取第一个元素，

List<Tool> distinctTool = tools.GroupBy(p => p.Number)
                               .Select(f => f.OrderByDescending(q => q.Source == "M1").First())
                               .ToList();

WORKING FIDDLE

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