避免在DataTable中重复列？

Question

这是我的DataTable：

ItemPartNumber        VendorName      Price
ANNF213               SAMSUNG         265.41
GDFF31D               HP              65.10
ANNF213               APPLE           115.51
FSF2122               MICROSOFT       655.47
GDSGG32               NOKIA           250.58
ANNF213               SAMSUNG         225.40

它有ANNF213三次。我想只采取第一个，并希望省略其余的行。

所需的输出数据表：

ItemPartNumber        VendorName      Price
ANNF213               SAMSUNG         265.41
GDFF31D               HP              65.10
FSF2122               MICROSOFT       655.47
GDSGG32               NOKIA           250.58

所以，我的简单问题是如何在省略重复的特定列值后获取行？

我试过了：

DataView view = new DataView(dataTable);
dataTable = view.ToTable(true, "ItemPartNumber", "VendorName", "Price");
//This isn't working.

dataTable = view.ToTable(true, "ItemPartNumber");
//This is working, but only `ItemPartNumber` is there on data table, but I need all three columns. Help me in this!

Answer 1

如果您只想保留第一个：

，我会使用Linq-To-DataTable

dataTable = dataTable.AsEnumerable()
    .GroupBy(row => row.Field<string>("ItemPartNumber"))
    .Select(grp => grp.First())
    .CopyToDataTable();

如果您想要更有意义的内容，例如保留最高价格的行：

dataTable = dataTable.AsEnumerable()
    .GroupBy(row => row.Field<string>("ItemPartNumber"))
    .Select(grp => grp.OrderByDescending(row => row.Field<decimal>("Price")).First())
    .CopyToDataTable();