我如何使用Linq获取按属性过滤的独特结果

这个问题在这里已经有了答案：

LINQ对特定属性的Distinct（）17的答案

---

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

---

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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