C#?? LINQ? ???? DataTable? ?? ??

?? ??? ?? ?? ???? ? ? ??? ????? ???? ???? ??? ?????? ?????. C#??? LINQ? ??? ??? ??? ???? DataTable? ?? ?? ??? ??? ? ????.

LINQ ??:

LINQ? ??? ?? ?? ?? ??? ? DataTable(T1 ? T2)?? ?? ??? ???? ??? ?????.

DataTable dt1 = new DataTable();
dt1.Columns.Add("CustID", typeof(int));
dt1.Columns.Add("ColX", typeof(int));
dt1.Columns.Add("ColY", typeof(int));

DataTable dt2 = new DataTable();
dt2.Columns.Add("CustID", typeof(int));
dt2.Columns.Add("ColZ", typeof(int));

// 添加一些示例數(shù)據(jù)
for (int i = 1; i <= 5; i++)
{
    dt1.Rows.Add(i, 10 + i, 20 + i);
    dt2.Rows.Add(i, 30 + i);
}

// 使用LINQ執(zhí)行內(nèi)連接
var results = from table1 in dt1.AsEnumerable()
              join table2 in dt2.AsEnumerable() on table1.Field<int>("CustID") equals table2.Field<int>("CustID")
              select new
              {
                  CustID = table1.Field<int>("CustID"),
                  ColX = table1.Field<int>("ColX"),
                  ColY = table1.Field<int>("ColY"),
                  ColZ = table2.Field<int>("ColZ")
              };

// 輸出結(jié)果
foreach (var item in results)
{
    Console.WriteLine(String.Format("ID = {0}, ColX = {1}, ColY = {2}, ColZ = {3}", item.CustID, item.ColX, item.ColY, item.ColZ));
}

? LINQ ??? ? ???? on ?? ???? ?? ???? CustID ?? ???? ?? ??? ?????. ??? CustID, ColX, ColY ? ColZ ?? ???? ?? ???? ?????.

??:

? ??? ?? ??? ?????.

ID = 1, ColX = 11, ColY = 21, ColZ = 31 ID = 2, ColX = 12, ColY = 22, ColZ = 32 ID = 3, ColX = 13, ColY = 23, ColZ = 33 ID = 4, ColX = 14, ColY = 24, ColZ = 34 ID = 5, ColX = 15, ColY = 25, ColZ = 35

? ??? LINQ? ???? C#? DataTable? ?? ?? ??? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!