关于ListView绑定数据

Question

        public static void FillListView(this ListView list, DataTable dt)
        {
            list.BeginUpdate();
            list.Items.Clear();
            int rowCount, columnCount;
            rowCount = dt.Rows.Count;
            columnCount = dt.Columns.Count;
            for (int i = 0; i < rowCount; i++)
            {
                ListViewItem item = new ListViewItem();
                item.Text = dt.Rows[i][0].ToString();                for (int j = 0; j < columnCount; j++)
                {
                    ListViewItem.ListViewSubItem subItem = new ListViewItem.ListViewSubItem();
                    subItem.Text = dt.Rows[i][j].ToString();
                    item.SubItems.Add(subItem);
                }
                list.Items.Add(item);
            }
            list.EndUpdate();
        }//测试数据DataTable
        private DataTable GetDataTable()
        {
            // 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);            column = new DataColumn();
            column.DataType = Type.GetType("System.String");
            column.ColumnName = "Third";
            column.ReadOnly = true;
            //column.Unique = true;
            table.Columns.Add(column);            column = new DataColumn();
            column.DataType = Type.GetType("System.String");
            column.ColumnName = "Four";
            column.ReadOnly = true;
            column.Unique = true;
            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 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;
                row["Third"] = "Third" + i;
                row["Four"] = "Four" + i;
                //row["Fri"] = "Fri" + i;
                table.Rows.Add(row);
            }            return table;
        }为什么显示的数据是下面数据的前四列，而不是后四列的内容？
0 0 ParentItem0 Third0 Four0
1 1 ParentItem1 Third1 Four1
2 2 ParentItem2 Third2 Four2

Answer 1

 private DataTable GetDataTable()
        {
            // 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);            column = new DataColumn();
            column.DataType = Type.GetType("System.String");
            column.ColumnName = "Third";
            column.ReadOnly = true;
            //column.Unique = true;
            table.Columns.Add(column);            column = new DataColumn();
            column.DataType = Type.GetType("System.String");
            column.ColumnName = "Four";
            column.ReadOnly = true;
            column.Unique = true;
            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 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;
                row["Third"] = "Third" + i;
                row["Four"] = "Four" + i;
                //row["Fri"] = "Fri" + i;
                table.Rows.Add(row);
            }            return table;
        }
看看设置主键是否可以直接在column id那直接设置

Answer 2

错误出在这：
for (int i = 0; i < rowCount; i++)
            {
                ListViewItem item = new ListViewItem();
                item.Text = dt.Rows[i][0].ToString();
                //j不应该从0开始循环，应该从1开始
                  //因为dt.Rows[i][0]这个值已经被item.Text显示了
                  //再循环一遍，就会出现第一次出现两次的结果
                  //把 int j=0 修改成 int j=1 应该就行了。
                for (int j = 0; j < columnCount; j++)
                {
                    ListViewItem.ListViewSubItem subItem = new ListViewItem.ListViewSubItem();
                    subItem.Text = dt.Rows[i][j].ToString();
                    item.SubItems.Add(subItem);
                }
                list.Items.Add(item);
            }