Datatable行转列

c#转换类____行列转换,新增行(基于DataTable)

using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Data.OracleClient; /// /// trans 的摘要说明 /// author: jorans xu /// public class trans//转换类 { public trans() {    //    // TODO: 在此处添加构造函数逻辑    // }     ///     /// DataTable 行转成列     ///     /// 数据源     /// 按哪些字段转成列     /// 需要转的列     /// 需要转的列对应的值     /// 当对应的列没有值时，使用该值     ///     public DataTable transRowToCol(DataTable DataTableSource,string groupbyDataMeber,string needTransDataMenber,string data,string defaultvalue)     {         DataTable dtSource = new DataTable();         //建立一个副本。         dtSource = DataTableSource.Copy();         DataTable dt = new DataTable();         bool flag = true;         //这是datatable中groupby的字段         string[] group=groupbyDataMeber.Split(',');         int count = group.Length;         //移到另外一个datatable，添加列名         for (int i = 0; i < group.Length; i++)         {             DataColumn dc = new DataColumn();             dc.ColumnName = group[i].ToString();             dt.Columns.Add(dc);         }         //这是动态添加列名，因为我们不知道要转换的列的值到底有多少。         //转换的列的值就是作为新的datatable的列名         for (int j = 0; j < dtSource.Rows.Count; j++)         {             string colValue = dtSource.Rows[j][needTransDataMenber].ToString();             for (int k = dt.Columns.Count - 1; k >= 0; k--)             {                 if(colValue==dt.Columns[k].ColumnName)//已经存在，则不需要再新增列名                 {                     break;                 }                 if (k == 0)//遍历完所有列，如果没有找到，则新增列名                 {                     DataColumn dc = new DataColumn();                     dc.ColumnName = colValue;                     dt.Columns.Add(dc);                 }             }              }         //以下是新增数据行         for (int i = 0; i < dtSource.Rows.Count;i++ )         {             DataRow dr = dt.NewRow();             //直接把值移到新的datatable，这些是group by的列             for (int k = 0; k < count;k++ )             {                 dr[group[k]]=dtSource.Rows[i][group[k]].ToString();             }             for(int j=count;j             {                 if (dtSource.Rows[i][needTransDataMenber].ToString() == dt.Columns[j].ColumnName)                 {                     dr[dt.Columns[j].ColumnName] = dtSource.Rows[i][data].ToString();                 }                 else                 {                     dr[dt.Columns[j].ColumnName] = defaultvalue;//在对应的列下没有值时，给默认值                 }             }             dt.Rows.Add(dr);//添加了一行             //以下是向原datatable继续遍历。如果有相同的groupby的字段则可以修改列值了             //因为groupby的字段可能不只一个，故使用标志位flag             for (int l = i + 1; l < dtSource.Rows.Count; l++)             {                 for (int m = 0; m < count; m++)                 {                     if (dtSource.Rows[l][group[m]].ToString() != dt.Rows[dt.Rows.Count - 1][group[m]].ToString())                     {                         flag = false;                         break;                     }                     else                     {                         flag = true;                     }                 }                 if (flag == true)                 {                     for (int j = count; j < dt.Columns.Count; j++)                     {                         if (dtSource.Rows[l][needTransDataMenber].ToString() == dt.Columns[j].ColumnName)                         {                             dt.Rows[dt.Rows.Count-1][j] = dtSource.Rows[l][data].ToString();                             dtSource.Rows.RemoveAt(l);//删除一行                             l--;                             break;                         }                     }                 }             }         }         return dt;     }     ///     /// DataTable 列转成行     ///     /// 数据源     /// 按哪些字段转成列     /// 需要转的列     /// 需要转的这些列的列名     /// 值对应的列名     ///     public DataTable transColToRow(DataTable DataTableSource,string groupbyDataMeber, string needTransCols, string beColName, string valueColName)     {         DataTable dts = DataTableSource;         DataTable dt = new DataTable();         string[] group=groupbyDataMeber.Split(',');         string[] colname=needTransCols.Split(',');         //create dt columnname         for (int i = 0; i < group.Length + 2;i++ )         {             if (i < group.Length)             {                 DataColumn dc = new DataColumn();                 dc.ColumnName = group[i];                 dt.Columns.Add(dc);             }             else             {                 dt.Columns.Add(beColName, System.Type.GetType("System.String"));                 dt.Columns.Add(valueColName, System.Type.GetType("System.String"));                 break;             }         }         for (int i = 0; i < dts.Rows.Count;i++ )         {             for (int j = 0; j < colname.Length;j++ )             {                 DataRow dr = dt.NewRow();                 for (int k = 0; k < group.Length; k++)                 {                     dr[group[k]] = dts.Rows[i][group[k]].ToString();                 }                 dr[beColName] = colname[j];                 dr[valueColName] = dts.Rows[i][colname[j]].ToString();                 dt.Rows.Add(dr);             }         }         return dt;     }     ///     /// DataTable 新增一行     ///     /// 数据源     /// 列值     ///     public DataTable addNewRow(DataTable dtSource,string rowsValue)     {         string[] values = rowsValue.Split(',');         DataRow dr = dtSource.NewRow();         for (int i = 0; i < values.Length; i++)         {             if (i < dtSource.Columns.Count)             {                 dr[i] = values[i];             }         }         dtSource.Rows.Add(dr);         return dtSource;     }     ///     /// DataTable 指定行号新增一行     ///     /// 数据源     /// 列值     /// 插入行的位置     ///     public DataTable addNewRow(DataTable dtSource, string rowsValue,int index)     {         string[] values = rowsValue.Split(',');         DataRow dr = dtSource.NewRow();         for (int i = 0; i < values.Length; i++)         {             if (i < dtSource.Columns.Count)             {                 dr[i] = values[i];             }         }         dtSource.Rows.InsertAt(dr,index);         return dtSource;     }     ///     /// GridView合并行,groupbyDataMeberIndex字段的数据必须有序     ///     /// GridView     /// group by 哪些字段的index     ///     public GridView mergeRows(GridView dtSource, string groupbyDataMeberIndex)     {         string[] group = groupbyDataMeberIndex.Split(',');         bool flag=false;         for (int j = 0; j < group.Length; j++)         {             int index = int.Parse(group[j]);             for (int i = 0; i < dtSource.Rows.Count; i++)             {                 for (int k = i + 1; k < dtSource.Rows.Count; k++)                 {                     string test1 = dtSource.Rows[i].Cells[index].Text.ToString();                     string test2 = dtSource.Rows[k].Cells[index].Text.ToString();                     if (dtSource.Rows[i].Cells[index].Text.ToString() == dtSource.Rows[k].Cells[index].Text.ToString())                     {                         flag = true;                     }                     else                     {                         flag = false;                     }                     if (flag == false)                     {                         if (k > i + 1)//多行一样，可合并                         {                             dtSource.Rows[i].Cells[index].RowSpan = k - i;                             for (int m = i + 1; m < i + k - i; m++)                             {                                 dtSource.Rows[m].Cells[index].Visible = false;                             }                         }                         i = k - 1;//next 应为k，因为i还要进行i++，所以先k-1                         break;                     }                     if (flag = true && k == dtSource.Rows.Count - 1)                     {                         dtSource.Rows[i].Cells[index].RowSpan = k - i + 1;                         for (int m = i + 1; m < i + (k - i + 1); m++)                         {                             dtSource.Rows[m].Cells[index].Visible = false;                             string test = dtSource.Rows[m].Cells[index].Text;                         }                         i = k;                         break;                     }                 }             }         }         return dtSource;     } }