循环一个UIElement变量名

Question

I try to loop the names of my food objects in an WPF application.

I want the following names of the foodelement: food0, food1, foot2 ...

for (int i = 0; i < foods.Count; i++)
{
    System.Windows.UIElement foodelement = "food" + i; // ERROR here
    Canvas.SetLeft(foodelement, foods[i].Position.X);
}

I get the error: Cannot implicitly convert type string to System.Windows.UIElement

Answer 1

This may help you

System.Windows.UIElement foodelement = (System.Windows.UIElement)YourContainer.FindName("food" + i);

Where YourContainer is the the container(grid/canvas/stack panel/) that holds the UIElements.

Or else you can use the following:

 System.Windows.UIElement foodelement = UIHelper.FindChild<System.Windows.UIElement>(Application.Current.MainWindow, "food" + i);

Answer 2

I think Following code will help you

 /// <summary> /// Finds a Child of a given item in the visual tree. /// </summary> /// <param name="parent">A direct parent of the queried item.</param> /// <typeparam name="T">The type of the queried item.</typeparam> /// <param name="childName">x:Name or Name of child. </param> /// <returns>The first parent item that matches the submitted type parameter. /// If not matching item can be found, /// a null parent is being returned.</returns> public static T FindChild<T>(DependencyObject parent, string childName) where T : DependencyObject { // Confirm parent and childName are valid. if (parent == null) return null; T foundChild = null; int childrenCount = VisualTreeHelper.GetChildrenCount(parent); for (int i = 0; i < childrenCount; i++) { var child = VisualTreeHelper.GetChild(parent, i); // If the child is not of the request child type child T childType = child as T; if (childType == null) { // recursively drill down the tree foundChild = FindChild<T>(child, childName); // If the child is found, break so we do not overwrite the found child. if (foundChild != null) break; } else if (!string.IsNullOrEmpty(childName)) { var frameworkElement = child as FrameworkElement; // If the child's name is set for search if (frameworkElement != null && frameworkElement.Name == childName) { // if the child's name is of the request name foundChild = (T)child; break; } } else { // child element found. foundChild = (T)child; break; } } return foundChild; } 

And use this method

  for (int i = 0; i < foods.Count; i++) { System.Windows.UIElement ui = FindChild<Button>(Application.Current.MainWindow, "food" + i); }