[英]Clear Textbox Controls on Window
internal static void FindChildren<T>(List<T> results, DependencyObject startNode)
where T : DependencyObject
{
int count = VisualTreeHelper.GetChildrenCount(startNode);
for (int i = 0; i < count; i++)
{
DependencyObject current = VisualTreeHelper.GetChild(startNode, i);
if ((current.GetType()).Equals(typeof(T)) || (current.GetType().GetTypeInfo().IsSubclassOf(typeof(T))))
{
T asType = (T)current;
results.Add(asType);
}
FindChildren<T>(results, current);
}
}
它基本上以遞歸方式獲取當前項目的子項,並將與請求的類型匹配的任何項目添加到提供的列表中。
然后,您只需要在頁面/按鈕處理程序/ ...中的某處執行以下操作:
var allTextBoxes = new List<TextBox>();
FindChildren(allTextBoxes, this);
foreach(var t in allTextBoxes)
{
t.Text = "Updated!";
}
簡單的方法就是TextBox.Text = String.Empty;
對於View中的每個TextBox。
您可以使用下面的代碼來找到控件。
public static T FindChild<T>(DependencyObject depObj, string childName)
where T : DependencyObject
{
// Confirm parent and childName are valid.
if (depObj == null) return null;
// success case
if (depObj is T && ((FrameworkElement)depObj).Name == childName)
return depObj as T;
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
//DFS
T obj = FindChild<T>(child, childName);
if (obj != null)
return obj;
}
return null;
}
並可以清除文本框。
TextBox txtBox1= FindChild<TextBox>(this, "txtBox1");
if (txtBox1!= null)
txtBox1.Text= String.Empty;
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