转载CSDN（educast）：c# 对两个Datatable的结构相同进行合并

Datatable db=null;
DataTable dt = ds.Tables[0];
////两个datatable进行合并
db = dt.Copy();
DataRow[] foundRows = dt.Select();
for (int i = 0; i < foundRows.Length;i++)
{
db.ImportRow(foundRows[i]);
}

//两个结构一样的DT合并

DataTable DataTable1 = new DataTable();

DataTable DataTable2 = new DataTable();

DataTable newDataTable = DataTable1.Clone();

object[] obj = new object[newDataTable.Columns.Count];

for (int i = 0; i < DataTable1.Rows.Count; i++)

{

DataTable1.Rows[i].ItemArray.CopyTo(obj,0);

newDataTable.Rows.Add(obj);

}

for (int i = 0; i < DataTable2.Rows.Count; i++)

{

DataTable2.Rows[i].ItemArray.CopyTo(obj,0);

newDataTable.Rows.Add(obj);

}

//两个结构不同的DT合并

/// <summary>

/// 将两个列不同的DataTable合并成一个新的DataTable

/// </summary>

/// <param name="dt1">表1</param>

/// <param name="dt2">表2</param>

/// <param name="DTName">合并后新的表名</param>

/// <returns></returns>

private DataTable UniteDataTable( DataTable dt1 ,DataTable dt2 ,string DTName)

{

DataTable dt3 = dt1.Clone();

for( int i = 0 ;i < dt2.Columns.Count ;i ++ )

{

dt3.Columns.Add( dt2.Columns[i].ColumnName ) ;

}

object[] obj = new object[dt3.Columns.Count];

for (int i = 0; i < dt1.Rows.Count; i++)

{

dt1.Rows[i].ItemArray.CopyTo(obj,0);

dt3.Rows.Add(obj);

}

if( dt1.Rows.Count >= dt2.Rows.Count )

{

for( int i = 0 ;i < dt2.Rows.Count ;i++ )

{

for( int j = 0 ;j < dt2.Columns.Count ;j ++ )

{

dt3.Rows[i][j+dt1.Columns.Count] = dt2.Rows[i][j].ToString() ;

}

}

}

else

{

DataRow dr3 ;

for( int i = 0 ;i < dt2.Rows.Count - dt1.Rows.Count ;i ++ )

{

dr3 = dt3.NewRow() ;

dt3.Rows.Add( dr3 ) ;

}

for( int i = 0 ;i < dt2.Rows.Count ;i++ )

{

for( int j = 0 ;j < dt2.Columns.Count ;j ++ )

{

dt3.Rows[i][j+dt1.Columns.Count] = dt2.Rows[i][j].ToString() ;

}

}

}

dt3.TableName = DTName ; //设置DT的名字

return dt3 ;

}

//多个 结构相同的DataTable合并

public DataTable GetAllEntrysDataTable()

{

DataTable newDataTable = GetEntrysDataTable(0).Clone();

object[] obj = new object[newDataTable.Columns.Count];

for (int i = 0; i < entryGroups.GetEntryGroupCount(); i++)

{

for (int j = 0; j < GetEntrysDataTable(i).Rows.Count; j++)

{

GetEntrysDataTable(i).Rows[j].ItemArray.CopyTo(obj, 0);

newDataTable.Rows.Add(obj);

}

}

return newDataTable;

}