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dataGrid1.SetDataBinding(dataSet,"ParentTable"); RRS feed

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  • User1515466651 posted

    In the following example from MSDN, I continue to have a problem with the following line @ SetDataBinding with classes

      dataGrid1.SetDataBinding(dataSet,"ParentTable");
     

     

     

    // Put the next line into the Declarations section.
    private System.Data.DataSet dataSet;
     
    private void MakeDataTables()
    {
        // Run all of the functions.
        MakeParentTable();
        MakeChildTable();
        MakeDataRelation();
        BindToDataGrid();
    }
     
    private void MakeParentTable()
    {
        // Create a new DataTable.
        System.Data.DataTable table = new DataTable("ParentTable");
        // Declare variables for DataColumn and DataRow objects.
        DataColumn column;
        DataRow row;
     
        // Create new DataColumn, set DataType,
        // ColumnName and add to DataTable.   
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.Int32");
        column.ColumnName = "id";
        column.ReadOnly = true;
        column.Unique = true;
        // Add the Column to the DataColumnCollection.
        table.Columns.Add(column);
     
        // Create second column.
        column = new DataColumn();
        column.DataType = System.Type.GetType("System.String");
        column.ColumnName = "ParentItem";
        column.AutoIncrement = false;
        column.Caption = "ParentItem";
        column.ReadOnly = false;
        column.Unique = false;
        // Add the column to the table.
        table.Columns.Add(column);
     
        // Make the ID column the primary key column.
        DataColumn[] PrimaryKeyColumns = new DataColumn[1];
        PrimaryKeyColumns[0] = table.Columns["id"];
        table.PrimaryKey = PrimaryKeyColumns;
     
        // Instantiate the DataSet variable.
        dataSet = new DataSet();
        // Add the new DataTable to the DataSet.
        dataSet.Tables.Add(table);
     
        // Create three new DataRow objects and add
        // them to the DataTable
        for (int i = 0; i<= 2; i++)
        {
            row = table.NewRow();
            row["id"] = i;
            row["ParentItem"] = "ParentItem " + i;
            table.Rows.Add(row);
        }
    }
     
    private void MakeChildTable()
    {
        // Create a new DataTable.
        DataTable table = new DataTable("childTable");
        DataColumn column;
        DataRow row;
     
        // Create first column and add to the DataTable.
        column = new DataColumn();
        column.DataType= System.Type.GetType("System.Int32");
        column.ColumnName = "ChildID";
        column.AutoIncrement = true;
        column.Caption = "ID";
        column.ReadOnly = true;
        column.Unique = true;

        // Add the column to the DataColumnCollection.
        table.Columns.Add(column);
     
        // Create second column.
        column = new DataColumn();
        column.DataType= System.Type.GetType("System.String");
        column.ColumnName = "ChildItem";
        column.AutoIncrement = false;
        column.Caption = "ChildItem";
        column.ReadOnly = false;
        column.Unique = false;
        table.Columns.Add(column);
     
        // Create third column.
        column = new DataColumn();
        column.DataType= System.Type.GetType("System.Int32");
        column.ColumnName = "ParentID";
        column.AutoIncrement = false;
        column.Caption = "ParentID";
        column.ReadOnly = false;
        column.Unique = false;
        table.Columns.Add(column);
     
        dataSet.Tables.Add(table);

        // Create three sets of DataRow objects,
        // five rows each, and add to DataTable.
        for(int i = 0; i <= 4; i ++)
        {
            row = table.NewRow();
            row["childID"] = i;
            row["ChildItem"] = "Item " + i;
            row["ParentID"] = 0 ;
            table.Rows.Add(row);
        }
        for(int i = 0; i <= 4; i ++)
        {
            row = table.NewRow();
            row["childID"] = i + 5;
            row["ChildItem"] = "Item " + i;
            row["ParentID"] = 1 ;
            table.Rows.Add(row);
        }
        for(int i = 0; i <= 4; i ++)
        {
            row = table.NewRow();
            row["childID"] = i + 10;
            row["ChildItem"] = "Item " + i;
            row["ParentID"] = 2 ;
            table.Rows.Add(row);
        }
    }
     
    private void MakeDataRelation()
    {
        // DataRelation requires two DataColumn
        // (parent and child) and a name.
        DataColumn parentColumn =
            dataSet.Tables["ParentTable"].Columns["id"];
        DataColumn childColumn =
            dataSet.Tables["ChildTable"].Columns["ParentID"];
        DataRelation relation = new
            DataRelation("parent2Child", parentColumn, childColumn);
        dataSet.Tables["ChildTable"].ParentRelations.Add(relation);
    }
     
    private void BindToDataGrid()
    {
        // Instruct the DataGrid to bind to the DataSet, with the
        // ParentTable as the topmost DataTable.
        dataGrid1.SetDataBinding(dataSet,"ParentTable");
    }

    Monday, August 6, 2007 4:52 PM

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