我有一个DataGridView与几个创建列.我添加了一些行,它们可以正确显示;但是,当我点击一个单元格时,内容就会消失.
我究竟做错了什么?
代码如下:
- foreach (SaleItem item in this.Invoice.SaleItems)
- {
- DataGridViewRow row = new DataGridViewRow();
- gridViewParts.Rows.Add(row);
- DataGridViewCell cellQuantity = new DataGridViewTextBoxCell();
- cellQuantity.Value = item.Quantity;
- row.Cells["colQuantity"] = cellQuantity;
- DataGridViewCell cellDescription = new DataGridViewTextBoxCell();
- cellDescription.Value = item.Part.Description;
- row.Cells["colDescription"] = cellDescription;
- DataGridViewCell cellCost = new DataGridViewTextBoxCell();
- cellCost.Value = item.Price;
- row.Cells["colUnitCost1"] = cellCost;
- DataGridViewCell cellTotal = new DataGridViewTextBoxCell();
- cellTotal.Value = item.Quantity * item.Price;
- row.Cells["colTotal"] = cellTotal;
- DataGridViewCell cellPartNumber = new DataGridViewTextBoxCell();
- cellPartNumber.Value = item.Part.Number;
- row.Cells["colPartNumber"] = cellPartNumber;
- }
谢谢!
解决方法
只是为了扩展这个问题,还有另一种向DataGridView添加行的方法,特别是如果列总是相同的话:
- object[] buffer = new object[5];
- List<DataGridViewRow> rows = new List<DataGridViewRow>();
- foreach (SaleItem item in this.Invoice.SaleItems)
- {
- buffer[0] = item.Quantity;
- buffer[1] = item.Part.Description;
- buffer[2] = item.Price;
- buffer[3] = item.Quantity * item.Price;
- buffer[4] = item.Part.Number;
- rows.Add(new DataGridViewRow());
- rows[rows.Count - 1].CreateCells(gridViewParts,buffer);
- }
- gridViewParts.Rows.AddRange(rows.ToArray());
或者如果你喜欢ParamArrays:
- List<DataGridViewRow> rows = new List<DataGridViewRow>();
- foreach (SaleItem item in this.Invoice.SaleItems)
- {
- rows.Add(new DataGridViewRow());
- rows[rows.Count - 1].CreateCells(gridViewParts,item.Quantity,item.Part.Description,item.Price,item.Quantity * item.Price,item.Part.Number
- );
- }
- gridViewParts.Rows.AddRange(rows.ToArray());
缓冲区中的值显然需要与列(包括隐藏的列)的顺序相同.
这是我发现将数据放入DataGridView而不将数据绑定到DataSource的最快方法.绑定网格实际上会加速它很长一段时间,如果你在网格中有超过500行,我强烈建议绑定它而不是手工填充它.
绑定还带有奖励,你可以保持对象的机智,例如.如果你想对所选行进行操作,你可以这样做是绑定DatagridView:
- if(gridViewParts.CurrentRow != null)
- {
- SaleItem item = (SalteItem)(gridViewParts.CurrentRow.DataBoundItem);
- // You can use item here without problems.
- }
建议您绑定的类确实实现System.ComponentModel.INotifyPropertyChanged接口,该接口允许它告知网格有关更改.