我正在尝试实现Drag&在标准DataGridView上删除多行.
我按住控制键和鼠标左键选择3行.然后我释放控制键以及选择要拖动的行的内容.因此,使用鼠标左键单击并按住其中一行上的按钮,以便我可以开始拖动动作.
但是,只要我单击其中一行,就会选择该行,并取消选择其他两行,这样我就不再移动3行了.
我怎样才能解决这个问题?如果我释放鼠标左键(没有ctrl键),我只希望再次突出显示该行.这就是Windows资源管理器的工作原理.
我在Visual Studio 2010中使用C#4.0.
解决方法
我在项目中遇到了这个问题 – 如何允许用户使用标准方法在datagridview中选择一堆行,然后将选择拖到另一个数据网格视图并删除它.我能够构建一个来自
http://www.codeproject.com/Tips/338594/Drag-drop-multiple-selected-rows-of-datagridview-w的想法,它只是将DataGridView子类化为“可拖动的”DataGridView,当用户按下已经选择的行上的按钮时捕获鼠标操作,同时允许所有其他情况的标准行为:
public partial class DraggableDataGridView : System.Windows.Forms.DataGridView { private Rectangle dragBoxFromMouseDown; protected override void OnMouseDown(MouseEventArgs e) { // Trap the case where the user pressed the left mouse button on an already-selected row // without <shift> or <control> if ((e.Button & MouseButtons.Left) == MouseButtons.Left && Control.ModifierKeys == Keys.None && this.SelectedRows.Count > 0 && HitTest(e.X,e.Y).RowIndex >= 0 && this.SelectedRows.Contains(this.Rows[HitTest(e.X,e.Y).RowIndex]) ) { // User pressed the mouse button over an already-selected row without <shift> or <control> so we should // consider drag and drop. Record a rectangle around that mouse location to possibly trigger drag // operation Debug.WriteLine("MouseDown inside selection"); Size dragSize = Systeminformation.DragSize; dragBoxFromMouseDown = new Rectangle(new Point(e.X - (dragSize.Width / 2),e.Y - (dragSize.Height / 2)),dragSize); } else { // In other cases use the default behavior for datagridview Debug.WriteLine("MouseDown outside selection"); dragBoxFromMouseDown = Rectangle.Empty; base.OnMouseDown(e); } } protected override void onmouseup(MouseEventArgs e) { base.onmouseup(e); } protected override void OnMouseMove(MouseEventArgs e) { if ((e.Button & MouseButtons.Left) == MouseButtons.Left) { // If the mouse moves outside the drag limit rectangle,start the drag. if (dragBoxFromMouseDown != Rectangle.Empty && !dragBoxFromMouseDown.Contains(e.Location)) { // Proceed with the drag and drop,passing in the selected rows DragDropEffects dropEffect = this.DoDragDrop(this.SelectedRows,DragDropEffects.Move); } } base.OnMouseMove(e); } public DraggableDataGridView() { InitializeComponent(); } protected override void OnPaint(PaintEventArgs pe) { base.OnPaint(pe); } }
拥有此代码,然后将此自定义组件替换为表单中的所有DataGridViews允许我将它们用作标准拖动源,并以通常的方式将它们“插入”其他组件的标准拖放功能.