获取组框内的子控件列表

Question

我的应用程序中有一个包含子控件的groupbox.(如附图中所示).我想枚举所有文本框,使用简单的foreach循环执行一些验证.

本文件大纲将对控制的住房提供一个公平的概念

foreach (Control control in grpBxTargetSensitivity.Controls)
            {
                if (control is FlowLayoutPanel && control.HasChildren)
                {
                    foreach (Control ctrl in control.Controls)
                    {
                        if (ctrl is Panel && ctrl.HasChildren)
                        {
                            foreach (Control tbox in ctrl.Controls)
                            {
                                if (tbox is TextBox)
                                {
                                    TextBox textbox = tbox as TextBox;
                                    validData &= !string.IsNullOrWhiteSpace(textbox.Text);
                                }
                            }
                        }
                    }
                }
            }

我的问题是,是否有更好的方法(可能通过LINQ)获得所有控件,包括容纳在面板内的文本框,而不是上述方法.

Answer 1

我不知道这更好......是否更容易阅读是一个意见问题:

var validData
    = grpBxTargetSensitivity.Controls.OfType<FlowLayoutPanel>()
                            .SelectMany(c => c.Controls.OfType<Panel>())
                            .SelectMany(c => c.Controls.OfType<TextBox>())
                            .All(textbox => !string.IsNullOrWhiteSpace(textbox.Text));

这将抓取GroupBox中所有FlowLayoutPanel中所有Panel内的所有TextBox,true如果所有这些TextBox都有值,则返回.

Answer 2

一班班轮

IEnumerable<TextBox> collection = grpBxTargetSensitivity.Children.OfType<TextBox>(); //assuming you are looking for TextBox

要么

您可以尝试以下通用方法，

public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
{
    if (depObj != null)
    {
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
        {
            DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
            if (child != null && child is T)
            {
                yield return (T)child;
            }

            foreach (T childOfChild in FindVisualChildren<T>(child))
            {
                yield return childOfChild;
            }
        }
    }
}

然后按以下方式枚举控件，

foreach (TextBox tb in FindVisualChildren<TextBox>(grpBxTargetSensitivity)) //assuming you are looking for TextBox
{
    // do something
}