gordafarid
Member
دو تا datatable درون حافظه دارم میخوام این دوتا را باهم join کنم ممکنه کسی کد asp.netبرام بنویسیه
public static DataTable Join(DataTable First, DataTable Second, DataColumn[] FJC, DataColumn[] SJC)
{
//Create Empty Table
DataTable table = new DataTable("Join");
// Use a DataSet to leverage DataRelation
using (DataSet ds = new DataSet())
{
//Add Copy of Tables
ds.Tables.AddRange(new DataTable[] { First.Copy(), Second.Copy() });
//Identify Joining Columns from First
DataColumn[] parentcolumns = new DataColumn[FJC.Length];
for (int i = 0; i < parentcolumns.Length; i++)
{
parentcolumns[i] = ds.Tables[0].Columns[FJC[i].ColumnName];
}
//Identify Joining Columns from Second
DataColumn[] childcolumns = new DataColumn[SJC.Length];
for (int i = 0; i < childcolumns.Length; i++)
{
childcolumns[i] = ds.Tables[1].Columns[SJC[i].ColumnName];
}
//Create DataRelation
DataRelation r = new DataRelation(string.Empty, parentcolumns, childcolumns, false);
ds.Relations.Add(r);
//Create Columns for JOIN table
for (int i = 0; i < First.Columns.Count; i++)
{
table.Columns.Add(First.Columns[i].ColumnName, First.Columns[i].DataType);
}
for (int i = 0; i < Second.Columns.Count; i++)
{
//Beware Duplicates
if (!table.Columns.Contains(Second.Columns[i].ColumnName))
table.Columns.Add(Second.Columns[i].ColumnName, Second.Columns[i].DataType);
else
table.Columns.Add(Second.Columns[i].ColumnName + "_Second", Second.Columns[i].DataType);
}
//Loop through First table
table.BeginLoadData();
foreach (DataRow firstrow in ds.Tables[0].Rows)
{
//Get "joined" rows
DataRow[] childrows = firstrow.GetChildRows(r);
if (childrows != null && childrows.Length > 0)
{
object[] parentarray = firstrow.ItemArray;
foreach (DataRow secondrow in childrows)
{
object[] secondarray = secondrow.ItemArray;
object[] joinarray = new object[parentarray.Length + secondarray.Length];
Array.Copy(parentarray, 0, joinarray, 0, parentarray.Length);
Array.Copy(secondarray, 0, joinarray, parentarray.Length, secondarray.Length);
table.LoadDataRow(joinarray, true);
}
}
}
table.EndLoadData();
}
return table;
}