数据透视表也缺少列名

Question

我有一个数据表，并将该数据表转换为另一个具有行名称为列名的数据透视表。我在数据中缺少一些行名，因此也需要在列名中包括这些行名。

我成功地将行动态转换为数据表中存在的列。我的数据中缺少提取类型“最早” 示例：

ID   PickupType   Pickupdate
1    Actual       12/10/2018
1    Planned      12/13/2018
1    Latest       12/13/2018
2    Actual       12/14/2018
2    Planned      12/15/2018 

代码：

string[] uniquedropType = tblpickupdates.AsEnumerable().Select(x => x.Field<string>("PickupType")).Distinct().ToArray();
    DataTable p_pickuptable = new DataTable();
    p_pickuptable.Columns.Add("ID", typeof(string));
    foreach (string colpickuptype in uniquedropType)
    {
        p_pickuptable.Columns.Add(colpickuptype, typeof(string));
    }
    var pickupgroups = tblpickupdates.AsEnumerable()
        .GroupBy(x => new
        {
            ID = x.Field<string>("ID"),

        }).ToList();

    foreach (var pickupgroup in pickupgroups)
    {
        DataRow newRow = p_pickuptable.Rows.Add();
        foreach (DataRow pickuptype in pickupgroup)
        {
            newRow[pickuptype.Field<string>("PickupType")] = pickuptype.Field<string>("Pickupdate");
        }

我期望结果如下

ID | Actual     |    Planned  |   Latest    |    Earliest
-- |----------- |  -----------| ----------- |  --------
1  |  12/10/2018| 12/13/2018  |  12/13/2018 |  NULL
2  | 12/14/2018 | 12/15/2018  |  NULL       |  NULL