C# 通用DataTable 拆分小表

一个简单的使用遍历的方式进行DataTable 的拆分

 private static List<DataTable> DataTableSplite(DataTable dt, int modcounts)

        {

            List<DataTable> list = new List<DataTable>();



            int counts = dt.Rows.Count / modcounts;  ///  取整数个数



            int mod = dt.Rows.Count % modcounts;    ///  余数



            if (mod > 0)

            {

                int index = 0;

                ///  处理拆分倍数的部分

                for (int i = 0; i < counts; i++)

                {



                    DataTable dt1 = dt.Clone();

                    dt1.TableName = "count" + i;

                    for (int j = index * modcounts; j < (index + 1) * modcounts; j++)

                    {



                        DataRow newrow = dt.NewRow();

                        DataRow row1 = dt.Rows[j];

                        newrow["name"] = row1["name"];

                        newrow["age"] = row1["age"];

                        dt1.Rows.Add(newrow.ItemArray);

                    }

                    index++;

                    list.Add(dt1);

                }

                

                ///  处理余数部分的组合

                DataTable dt2 = dt.Clone();

                dt2.TableName = "modetable";

                for (int i = counts * modcounts; i < dt.Rows.Count; i++)

                {

                    DataRow newrow = dt.NewRow();

                    DataRow row1 = dt.Rows[i];

                    newrow["name"] = row1["name"];

                    newrow["age"] = row1["age"];

                    dt2.Rows.Add(newrow.ItemArray);

                }

                list.Add(dt2);



            }

            else

            {

                ///   余数为0 的情况处理

                int index = 0;

                for (int i = 0; i < counts; i++)

                {



                    DataTable dt1 = dt.Clone();

                    dt1.TableName = "modetable";

                    for (int j = index * modcounts; j < (index + 1) * modcounts; j++)

                    {



                        DataRow newrow = dt.NewRow();

                        DataRow row1 = dt.Rows[j];

                        newrow["name"] = row1["name"];

                        newrow["age"] = row1["age"];

                        dt1.Rows.Add(newrow.ItemArray);

                    }

                    index++;

                    list.Add(dt1);

                }

            }



            return list;

        }

实现的方式比较简单，同时也可以使用linq 的方式进行

代码如下：

private static List<DataTable> DataTableSplite2(DataTable dt, int modcounts)

        {



            int counts = dt.Rows.Count / modcounts;  ///  取整数个数



            List<DataTable> list = new List<DataTable>();                                     ///  



            int index = 0;

            for (int i = 0; i < counts + 1; i++)

            {

                list.Add(dt.AsEnumerable().Skip(index * modcounts).Take(modcounts).CopyToDataTable());



                index++;

            }

            return list;



        }

代码更少。