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一些c# groupby的分组转换操作技巧包括:
- 使用Select方法对每个分组进行转换操作,例如:
var groupedData = data.GroupBy(x => x.Category) .Select(g => new { Category = g.Key, Count = g.Count(), TotalValue = g.Sum(x => x.Value) });
- 使用SelectMany方法将所有分组合并为一个集合,然后进行转换操作,例如:
var transformedData = data.GroupBy(x => x.Category) .SelectMany(g => g.Select(x => new { Category = g.Key, Value = x.Value * 2 }));
- 使用ToDictionary方法将分组转换为字典,方便后续操作,例如:
var groupedDictionary = data.GroupBy(x => x.Category) .ToDictionary(g => g.Key, g => g.ToList());
- 使用Aggregate方法对每个分组进行累加操作,例如:
var aggregatedData = data.GroupBy(x => x.Category) .Select(g => new { Category = g.Key, TotalValue = g.Aggregate(0.0, (acc, x) => acc + x.Value) });