如何使用linq从列表中找到最后一个项目具有相同项目

user2698348 发表于 Dev

用户名

我有上课记录

public class Record
{
    public string recordID { get; set; }

    public string recordName { get; set; }
}

并且一个列表记录包含很多记录，它们可能相等

List<Record> records = new List<Record>();

records.Add(new Record { recordID = "1", recordName = "name1" });
records.Add(new Record { recordID = "2", recordName = "name2" });
records.Add(new Record { recordID = "3", recordName = "name3" });
records.Add(new Record { recordID = "4", recordName = "name4" });
records.Add(new Record { recordID = "1", recordName = "name1" });
records.Add(new Record { recordID = "2", recordName = "name2" });
records.Add(new Record { recordID = "3", recordName = "name3" });

从这个清单

我想从recordID相同的列表中搜索最后一个项目

做点什么

例如：从列表中找到最后一个相同的项目，然后为其着色

records.All(p =>{
    (p.recordID == 3 /*any recordID*/ 
    && /*the record of the same is the last in list*/
    ? "<span style='corlor:red'>" + p.recordName + "</span>"
    : "<span style='corlor:green'>" + p.recordName + "</span>");
    return true;
});

谢谢

穆孔德

public class SOProblem1
{
    public static void Main()
    {
        var records = new List<Record>
        {
            new Record {recordID = "1", recordName = "name1"},
            new Record {recordID = "2", recordName = "name2"},
            new Record {recordID = "3", recordName = "name3"},
            new Record {recordID = "4", recordName = "name4"},
            new Record {recordID = "1", recordName = "name1"},
            new Record {recordID = "2", recordName = "name2"},
            new Record {recordID = "3", recordName = "name3"}
        };

        var t = records.GroupBy(x => x.recordID);

        foreach (var record in t)
        {
            Console.WriteLine(record.Last().recordName);
        }

        Console.ReadKey();
    }
}

public class Record
{
    public string recordID { get; set; }

    public string recordName { get; set; }
}