Linq操作Datable

DataSet ds = new DataSet();
// 省略ds的Fill代码
DataTable products = ds.Tables["Product"];
var rows = products.AsEnumerable()
    .Select(p => new
    ...{
        ProductID = p.Field<int>("ProductID"),
        ProductName = p.Field<string>("ProductName"),
        UnitPrice = p.Field<decimal>("UnitPrice")
    });
foreach (var row in rows)
...{
    Console.WriteLine(row.ProductName);
}

		

var rows = products.AsEnumerable()
    .Where(p => p.Field<decimal>("UnitPrice") > 10m)
    .Select(p => new
    ...{
        ProductID = p.Field<int>("ProductID"),
        ProductName = p.Field<string>("ProductName"),
        UnitPrice = p.Field<decimal>("UnitPrice")
    });

		

var rows = products.AsEnumerable()
    .Where(p => p.Field<decimal>("UnitPrice") > 10m)
    .OrderBy(p => p.Field<int>("SortOrder"))
    .Select(p => new
    ...{
        ProductID = p.Field<int>("ProductID"),
        ProductName = p.Field<string>("ProductName"),
        UnitPrice = p.Field<decimal>("UnitPrice")
    });

		

var expr = from p in ds.Tables["Product"].AsEnumerable()
           orderby p.Field<int>("SortOrder"), p.Field<string>("ProductName") descending
           select p;

				

var query = from p in ds.Tables["Product"].AsEnumerable()
            from c in ds.Tables["Category"].AsEnumerable()
            where p.Field<int>("CategoryID") == c.Field<int>("CategoryID")
                && p.Field<decimal>("UnitPrice") > 10m
            select new
            ...{
                ProductID = p.Field<int>("ProductID"),
                ProductName = p.Field<string>("ProductName"),
                CategoryName = c.Field<string>("CategoryName")
            };

		

var query = from p in ds.Tables["Product"].AsEnumerable()
            group p by p.Field<int>("CategoryID") into g
            select new
            ...{
                CategoryID = g.Key,
                Products = g
            };

foreach (var item in query)
...{
    Console.WriteLine(item.CategoryID);
    foreach (var p in item.Products)
    ...{
        Console.WriteLine(p.Field<string>("ProductName"));
    }
}