更新多行时出现问题

Question

表：ProductComapny

字段：NameProduct

NameProduct

1

1

1

4

5

我想更新字段NameProduct，其中NameProduct = 1到（NameProduct = 1，NameProduct = 2，NameProduct = 3

这怎么可以工作？

结果

NameProduct

1

2

3

4

5

Answer 1

var source = new int[] {1,1,1,4,5};
var result = source.Select( (val,i) => val==1 ? i : val );

Answer 2

试试这个：

using (DataClassesDataContext dc=new DataClassesDataContext())
    {
        var my = from a in dc.ProductComapny
                 where a.NameProduct== 1
                 select a;

        int i=1;
        foreach (var item in my)
        {
            item.NameProduct= i;
            dc.SubmitChanges();
            i++;
        }
    }