LINQ 按结果属性拆分和分组

Question

我有一个对象，该对象的属性之一是逗号分隔的名称列表，例如

IList<Audits> auditData = new List<Audits>();
auditData.Add(new Audit
              {
                  Auditors = "Adam West, George Best",
                  TimeSpent = 7
              });

auditData.Add(new Audit
              {
                  Auditors = "Adam West",
                  TimeSpent = 5
              });

auditData.Add(new Audit
              {
                   Auditors = "Adam West, George Best, Elvis Presley",
                   TimeSpent = 3
              });

我想使用 LINQ 来查询此数据，拆分审计员属性(property)，按审计员分组并计算每个审计员花费的时间总和，以便给我一份审计员列表以及针对每个审计员花费的时间，例如

亚当·韦斯特 15，
乔治·贝斯特 10，
猫王 3

谁能帮我做这件事？谢谢。

Answer 1

使用 lambda:

var results =
    auditData
        // Flatten list - to list of individual auditors and time spent
        .SelectMany(
            audit => audit.Auditors.Split(',').Select(s => s.Trim()),
            (audit, auditorName) => new
            {
                Auditor = auditorName,
                TimeSpent = audit.TimeSpent,
            })
        // Group by auditor name
        .GroupBy(a => a.Auditor)
        // Sum time spent
        .Select(auditorGroup => new
        {
            Auditor = auditorGroup.Key,
            TotalTimeSpent = auditorGroup.Sum(a => a.TimeSpent)
        })
        .ToList();