• 2022-06-08 问题

    dt为DataTable类型的变量,引用名为"Customers"的DataTable对象。该表中包含"CustomerID"、"CustomerName"、"Address"、"Telephone"等4列。将数据列"CustomerID"设为该表的主键的正确语句有:() A: dt.PrimaryKey="CustomerID"; B: dt.PrimaryKey.Add("CustomerID"); C: dt.PrimaryKey=newobject[]{"CustomerID"}; D: dt.PrimaryKey=newDataColumn[]{dt.Columns["CustomerID"]};

    dt为DataTable类型的变量,引用名为"Customers"的DataTable对象。该表中包含"CustomerID"、"CustomerName"、"Address"、"Telephone"等4列。将数据列"CustomerID"设为该表的主键的正确语句有:() A: dt.PrimaryKey="CustomerID"; B: dt.PrimaryKey.Add("CustomerID"); C: dt.PrimaryKey=newobject[]{"CustomerID"}; D: dt.PrimaryKey=newDataColumn[]{dt.Columns["CustomerID"]};

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