如何将 UserControl 中的所有文本框添加到 GridView [英] How to get all the textBoxes in the UserControl added into GridView
问题描述
在页面上,我动态地将 UserControl 添加到 GridView 中.因此,每个 UserControl 可以包含不同类型的控件(TextBox、CheckBox、Radio Button)
比如说,UserControl的名字是:UserForm.
问题:如何使用 VisualTreeHelper 获取控件集合并检查 textBox 是否为空.
我发现了一个与此问题类似的代码并修改了它但不起作用.
我不知道这意味着什么以及是否需要这样做?
list.AddRange(AllTextBoxes(child))
我应该使用 MyList.Select() 还是 MyList.Where() ?
<前>无效的 FindTextBoxes(){List这是我使用的.
void MainPage_Loaded(object sender, RoutedEventArgs e){var textBoxes = AllChildren(MyGridView).Where(x => x is TextBox);}公共 IEnumerable<Control>AllChildren(DependencyObject parent){for (int index = 0; index < VisualTreeHelper.GetChildrenCount(parent); index++){var child = VisualTreeHelper.GetChild(parent, index);如果(孩子是控制)yield return child 作为 Control;foreach (AllChildren(child) 中的 var 项目)收益率返回项;}}
祝你好运!
On the Page, I add UserControl into GridView dynamically. So, each UserControl can contain different kind of controls ( TextBox, CheckBox, Radio Button)
say , the name of UserControl is : UserForm.
problem : How to get a collection of control using VisualTreeHelper and check if textBox is empty.
I found a code similiar to this problem and modified it but not working.
I dont know what this means and if this is required?
list.AddRange(AllTextBoxes(child))
Should I use MyList.Select() or MyList.Where() ?
void FindTextBoxes() { List <TextBox> MyList = AllTextBoxes(UserForm); var count = MyList.Where(x= > if(string.IsEmptyOrNull(x.Text)); } List <TextBox> AllTextBoxes(DependencyObject parent) { var list = new List <TextBox>(); for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++) { var child = VisualTreeHelper.GetChild(parent, i); if (child is TextBox) list.Add(child as TextBox); list.AddRange(AllTextBoxes(child)); } return list; }
Here's what I use.
void MainPage_Loaded(object sender, RoutedEventArgs e)
{
var textBoxes = AllChildren(MyGridView).Where(x => x is TextBox);
}
public IEnumerable<Control> AllChildren(DependencyObject parent)
{
for (int index = 0; index < VisualTreeHelper.GetChildrenCount(parent); index++)
{
var child = VisualTreeHelper.GetChild(parent, index);
if (child is Control)
yield return child as Control;
foreach (var item in AllChildren(child))
yield return item;
}
}
Best of luck!
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