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.
