C#:DataGridView中列类型使用时间控件和下拉列表的自动匹配
来源:http://blog.csdn.net/kingzone_2008/article/details/8470666
1. DataGridView中使用时间控件作为列类型
DataGridView中默认不提供DateTimePicker类型的列类型,因此可以通过控件的覆盖模拟所需的功能。详细步骤如下:
第一步,将DataGridView单元格设置为DataGridViewTextBoxColumn类型(文本单元格);
第二步,创建一个DateTimePicker控件dateTimePicker1(时间控件),Visible属性设置为false;
第三步,将时间控件的坐标设置为对应文本单元格的坐标;
第四步,若文本单元格原来为空,则时间控件设置为当前时间,若有值,则时间控件Value属性设置为其值;
第五步,dateTimePicker1的ValueChanged事件和Leave事件的处理。
下面是第三步和第四步的代码:
private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
// 设置坐标
this.dateTimePicker1.Left = this.dataGridView1.Left + this.dataGridView1.GetCellDisplayRectangle(e.ColumnIndex, e.RowIndex, false).X;
this.dateTimePicker1.Top = this.dataGridView1.Top + this.dataGridView1.GetCellDisplayRectangle(e.ColumnIndex, e.RowIndex, false).Y;
// 值
if (this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value == null || this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString() == "")
{
this.dateTimePicker1.Value = DateTime.Now;
this.dateTimePicker1.Visible = true;
}
else
{
this.dateTimePicker1.Value = Convert.ToDateTime(this.dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value);
this.dateTimePicker1.Visible = true;
}
}
第五步的代码:
private void dateTimePicker1_Leave(object sender, EventArgs e)
{
this.dateTimePicker1.Visible = false;
//this.dataGridView1.CurrentCell.Value = this.dateTimePicker1.Value;
}
private void dateTimePicker1_ValueChanged(object sender, EventArgs e)
{
//this.dateTimePicker1.Visible = false;
this.dataGridView1.CurrentCell.Value = this.dateTimePicker1.Value;
}
2. DataGridView中实现DataGridViewComboBoxColumn的自动匹配
这里假定已经设置了DataGridViewComboBoxColumn列的DataSource,则只需在dataGridView的EditingControlShowing事件中添加相关处理逻辑。
// 显示用于编辑单元格的控件时触发
private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
if (e.Control.GetType() == typeof(DataGridViewComboBoxEditingControl))
{
//((ComboBox)e.Control).DropDownStyle = ComboBoxStyle.DropDown;
ComboBox cbo = e.Control as ComboBox;
cbo.DropDownStyle = ComboBoxStyle.DropDown;
cbo.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
// 可能导致绑定多个监听函数,重复执行
//cbo.SelectedValueChanged += new EventHandler(cbo_SelectedValueChanged);
//Console.WriteLine(cbo.SelectedText);
}
}
void cbo_SelectedValueChanged(object sender, EventArgs e)
{
// TODO
}
3. DataGridView自动滚动到最新的记录
代码如下:
// 滚动条滚动到最后
if (this.dataGridView1.Rows.Count >= 1)
{
this.dataGridView1.FirstDisplayedScrollingRowIndex = this.dataGridView1.Rows.Count - 1;
}
