从 Linq 的数据表中选择不同的行

问题描述：

我正在尝试根据多列(attribute1_name、attribute2_name)获取不同的行，并使用 Linq-to-Dataset 从数据表中获取数据行.

I am trying to get distinct rows based on multiple columns (attribute1_name, attribute2_name) and get datarows from datatable using Linq-to-Dataset.

我想要这样的结果

attribute1_name    attribute2_name
--------------     ---------------

Age                State
Age                weekend_percent
Age                statebreaklaw
Age                Annual Sales
Age                Assortment

如何精简 Linq-to-dataset?

How to do thin Linq-to-dataset?

答

如果它不是类型化数据集，那么您可能想要使用 Linq-to-DataSet 扩展方法来做这样的事情:

If it's not a typed dataset, then you probably want to do something like this, using the Linq-to-DataSet extension methods:

var distinctValues = dsValues.AsEnumerable()
                        .Select(row => new {
                            attribute1_name = row.Field<string>("attribute1_name"),
                            attribute2_name = row.Field<string>("attribute2_name")
                         })
                        .Distinct();

确保在代码的开头有一个 using System.Data; 语句，以启用 Linq-to-Dataset 扩展方法.

Make sure you have a using System.Data; statement at the beginning of your code in order to enable the Linq-to-Dataset extension methods.

希望这有帮助！

从 Linq 的数据表中选择不同的行

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