如何在 Winforms C# 中删除选定的控件？ [关闭]

Question

我需要当您单击垃圾按钮时，“选择模式”打开（布尔变量变为真），当您单击该控件（比如说一个按钮）时，应用程序“选择它”并使用另一个按钮， （确定按钮）应用程序应该知道您单击了哪个控件，然后删除它们，我遇到的问题在于您选择的识别女巫控件 更新 对于“选择”，我的意思是应用知道您点击了哪个控件

Answer 1

您可以按如下方式实现所需的功能。这个想法很简单，为了跟踪我们最后的选择，我们在我们的类中有一个类型为“Control”的“previousSelection”变量。我们甚至可以使用“控制”类型的列表来跟踪多个选择。

有一个切换按钮可以启用/禁用“垃圾模式”，它映射到“bool”类型的“IsGarbageModeEnabled”字段。然后我们有一个“InitControlsRecursiveMethod(ControlCollection collection)”，它接收一个控件集合，我们将附加一个事件处理程序，即“GenericClickHandler(Control c) “在我们的例子中。此处理程序仅在每次单击按钮时更新“previousSelection”。

最后我们有我们的按钮“ConfirmDeletionBtn”，点击它后，我们会检查是否启用了“GarbageMode”，如果是，我们将进行一些基本验证来检查是否被删除的控件不是我们的“Delete”或“GarbageModeToggle”按钮本身（如果用户双击“Delete”按钮，这可能会导致问题）。之后，它将删除/处置要删除的控件。

public partial class FormName : Form
{
    //To keep track of the previously selected control (i.e. to be deleted)
    private Control previousSelection { get; set; }

    //To keep track of whether "Garbage Mode" is enabled or disabled
    private bool IsGarbageModeEnabled { get; set; }

    //Constructor
    public FormName()
    {
        InitializeComponent();
        IsGarbageModeEnabled = false;
        previousSelection = new Control();

        //Attach a generic click handling event to each control to 
        //update "previousSelection" with each click.
        //Similar logic can be used for other events as well 
        //(e.g. GotFocus, which might even accomodate control selection via keyboard).
        InitControlsRecursive(this.Controls);
    }

    //This attaches the GenericClickHandler(Control c) to each control on the form.
    private void InitControlsRecursive(Control.ControlCollection collection)
    {
        foreach (Control c in collection)
        {
            c.MouseClick += (sender, e) => { GenericClickHandler(c); };
            InitControlsRecursive(c.Controls);
        }
    }

    //The generic click handling event we're using to update "previousSelection".
    private void GenericClickHandler(Control c)
    {
        previousSelection = c;
    }

    //By clicking the confirm deletion / OK button, we would delete the last selected control.
    private void ConfirmDeletionBtn_Click(object sender, EventArgs e)
    {
        if(IsGarbageModeEnabled == true)
        {
            if(previousSelection != ConfirmDeletionBtn || previousSelection != ToggleGarbageModeBtn)
            {
                this.Controls.Remove(previousSelection);
                previousSelection.Dispose();
            }
        }
    }

    //This is used to enable/disable Garbage Mode. Controls can be deleted only once it is enabled.
    private void ToggleGarbageModeBtn_Click(object sender, EventArgs e)
    {
        IsGarbageModeEnabled = !IsGarbageModeEnabled;
    }
}

进一步阅读：

• Handling a click for all controls on a form
• Removing a control from a form

Answer 2

首先，您需要在某个地方跟踪“选择”（单击）的控件。因此，将其添加到表单的代码隐藏中：

List<Control> _itemsToDelete = new List<Control>();

而且你需要一个标志来表明用户是否激活了垃圾模式：

bool _garbageMode = false;

激活垃圾模式：

async void GarbageMode_Click(object sender, EventArgs e)
{
    _garbageMode = true;
}

现在，当他们“选择”一个控件时，您将其添加到列表中：

async void Control_Click(object sender, EventArgs e)
{
    if (_garbageMode)
    {
        _itemsToDelete.Add((Control)sender);
    }
}

然后删除

foreach (var control in _itemsToDelete)
{
    this.Controls.Remove(control);
    control.Dispose();
}
_itemsToDelete.Clear();