防止在文本框中丢失焦点

Question

我目前陷入C＃.net控制组件焦点的困境。我的目标是在“点击”另一个组件（例如文本框B或其他东西）时防止丢失文本框A的焦点。除了单击文本框C或D ...之外，将保留此“焦点”机制。

这可能听起来很奇怪，但我的情况是，A，C，D行中的每一行都是一个datarepeater项目，我只想垂直移动“焦点”在右列，而不是B列。

所以，有可能在C＃中做到这一点，或者我必须找到另一个控件（不是数据转发器）。任何帮助都会很感激。

Answer 1

您可以使用TextBoxA的Leave事件以及包含允许获取焦点的控件的列表。

    [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.Winapi)]
    internal static extern IntPtr GetFocus();

    private Control GetFocusedControl()
    {
        Control focusedControl = null;
        // To get hold of the focused control:
        IntPtr focusedHandle = GetFocus();
        if (focusedHandle != IntPtr.Zero)
            // Note that if the focused Control is not a .Net control, then this will return null.
            focusedControl = Control.FromHandle(focusedHandle);
        return focusedControl;
    }

    private void textBox3_Leave(object sender, EventArgs e)
    {
        //Any control that is allowed to acquire focus is just added to this array.
        Control[] allowedToAcquireFocusControls = { 
                 textBox1
            };

        Control focusedControl = GetFocusedControl();

        if (!allowedToAcquireFocusControls.Contains(focusedControl))
        {
            textBox3.Focus();
        }
    }

参考：What is the preferred way to find focused control in WinForms app?