我正在尝试模拟用户按下ctrl,当我以编程方式选择某些内容时,主要目标是在datagridview中(最初(我不希望用户然后更改该选择,如果不是只是添加或减去,就像您按住ctrl +鼠标左键单击一样。我什至不知道从哪里开始。我试图创建一个与逻辑相结合的选择更改事件,但这会导致无限循环,因为我们将由用户选择一个,然后代码更改其他和其他等无限触发该事件。请帮忙,我是编码新手。我也不知道如何确定 ctrl 键是否已按下、按下并被按住。
private void selecttionh(object sender, EventArgs e)
{
if (stage == "4A" || stage == "3B" && ModifierKeys.HasFlag(Keys.Control))
{
int nothing = 0;
btnclickercl bt = new btnclickercl();
bt.dataGridView1_SelectionChanged(sender, e, dataGridViewReslist, dataGridViewnewres, nothing);
}
if (stage == "4A" || stage == "3B" && (ModifierKeys & Keys.Control) != Keys.Control)
{
MessageBox.Show("Please Press and hold " + "'ctrl'" + " to continue");
dataGridViewReslist.ClearSelection();
for (int i = 0; i < ResRoomSelections.Count; i++)
{
dataGridViewReslist.Rows[ResRoomSelections[i][0]].Cells[ResRoomSelections[i][1]].Selected = true;
dataGridViewReslist.Rows[ResRoomSelections[i][0]].Cells[(ResRoomSelections[i][1]) + 1].Selected = true;
}
}
else
{
dataGridViewReslist.ClearSelection();
for (int i = 0; i < ResRoomSelections.Count; i++)
{
dataGridViewReslist.Rows[ResRoomSelections[i][0]].Cells[ResRoomSelections[i][1]].Selected = true;
dataGridViewReslist.Rows[ResRoomSelections[i][0]].Cells[(ResRoomSelections[i][1]) + 1].Selected = true;
}
}
}
实现此目的的方法是单独存储选择状态,在用户单击单元格时更新它,然后重新应用它。这可以防止每次单击时丢失所选内容。如果您挂接正确的事件处理程序(鼠标向上,而不是单击(,则可以执行此操作,而不会使屏幕闪烁,否则看起来一团糟。
您需要的一切都在此类中,包括扩展方法SetupToggledSelectionMode()
,这是您的入口点。
static public class Example
{
static private bool[][] GetSelectionState(DataGridView input)
{
int rowCount = input.Rows.Count;
int columnCount = input.Columns.Count;
var result = new bool[rowCount][];
for (var r = 0; r < rowCount; r++)
{
result[r] = new bool[columnCount];
for (var c = 0; c < columnCount; c++)
{
var cell = input.Rows[r].Cells[c];
result[r][c] = cell.Selected;
}
}
return result;
}
static private void SetSelectionState(DataGridView input, bool[][] selectionState)
{
for (int r = 0; r <= selectionState.GetUpperBound(0); r++)
{
for (int c = 0; c <= selectionState[r].GetUpperBound(0); c++)
{
input.Rows[r].Cells[c].Selected = selectionState[r][c];
}
}
}
static public void SetupToggledSelectionMode(this DataGridView input)
{
bool[][] selectionState = GetSelectionState(input); //This will be stored in a closure due to the lambda expressions below
input.CellMouseUp += (object sender, DataGridViewCellMouseEventArgs e) =>
{
selectionState[e.RowIndex][e.ColumnIndex] = !selectionState[e.RowIndex][e.ColumnIndex];
SetSelectionState(input, selectionState);
};
input.SelectionChanged += (object sender, EventArgs e) =>
{
if (selectionState != null)
{
SetSelectionState(input, selectionState);
}
};
}
}
若要使用,请填充网格视图,以编程方式设置初始选择,然后按如下所示调用它:
myDataGrid.DataSource = myData;
myDataGrid.Refresh();
myDataGrid.SelectAll();
myDataGrid.SetupToggledSelectionMode();
SetupToggledSelectionMode()
方法将注册必要的事件处理程序,并将网格的选择状态存储在两个处理程序都可以访问的封闭变量中。因此,您不必声明任何其他内容;只需调用该方法。
谢谢你,这真的帮助了我。 我所做的只是让它更有效率。由于它会在每一步都调用选择更改,所以我完全摆脱了该事件,只保留了 CellMouseup 事件。
static private bool[][] GetSelectionState(DataGridView input)
{
int rowCount = input.Rows.Count;
int columnCount = input.Columns.Count;
var result = new List<int[]>();
for (var r = 0; r < rowCount; r++)
{
for (var c = 0; c < columnCount; c++)
{
if(input.Rows[r].Cells[c].Selected==true)
{
result.add(new int[]{r,c});//will keep only the integer of selected items
}
}
}
return result;//this for me was a recycled variable it can be used or recycled from somewhere else
}
private void SetSelectionState(DataGridView input,result)
{
for (int i=0;i<result.Count;i++)
{
input.Rows[result[i][0]].Cells[result[i][1]].Selected = true;
}
}
public void SetupToggledSelectionMode(DataGridView input,result)
{
for (int i=0;i<result.Count;i++)
{
if(result[i].SequenceEqual(new int[] { e.RowIndex, e.ColumnIndex }))
{
result.RemoveAt(i);
continueer = 1;
break;
}
}
if (continueer == 0)
{
ResRoomSelections.Add(new int[] { e.RowIndex, e.ColumnIndex });
}
SetSelectionState(input);
//whatever else you need to do
}
我知道还有更好的方法来搜索列表,但我无法让 lamda 搜索工作,所以我只是使用了蛮力
-谢谢吴约翰