也许这会有所帮助:
var customers = new DataTable();
customers.Columns.Add("ID", typeof(int));
customers.Columns.Add("Name");
customers.Rows.Add(1, "Tom");
customers.Rows.Add(2, "Dick");
customers.Rows.Add(3, "Harry");
var purchases = new DataTable();
purchases.Columns.Add("ID");
purchases.Columns.Add("Description");
purchases.Columns.Add("PurchaseID", typeof(int));
purchases.Rows.Add(1, "Bike", 1);
purchases.Rows.Add(2, "Holiday", 1);
purchases.Rows.Add(3, "Bike", 2);
purchases.Rows.Add(4, "Car", 3);
var query = customers.AsEnumerable().Join(purchases.AsEnumerable(),
cust => cust.Field<int>("ID"),
purch => purch.Field<int>("PurchaseID"),
(cust, purch) =>
{
var res = new List<object>();
res.AddRange(cust.ItemArray);
res.AddRange(purch.ItemArray);
return res.ToArray();
}
);
嗯,对不起,我似乎已经搞砸了我所知道的关于LINQ加入...只是为了记录:这是扩展方法的转换(这次应该工作):'var res = dt1.AsEnumerable()。Join(dt2.AsEnumerable(),c => c.Field( “ID”),x => x.Field (“ID”),(c,x)=> new {...})'。但从那时起,不幸的是我目前无法帮助你。我想说,你必须遍历所有现有的属性。我认为,LINQ确实缺少一个'*'操作符...... –
phg