public

static

void SearchVisualTree(DependencyObject targetElement,

int width,

string Node)

{

var count = VisualTreeHelper.GetChildrenCount(targetElement);

if (count ==

0)

{

return;

}

for (

int i =

0; i < count; i++)

{

var child = VisualTreeHelper.GetChild(targetElement, i);

if (child

is TextBlock)

{

TextBlock targetItem = (TextBlock)child;

if (targetItem.Name == Node)

targetItem.Width = width;

}

else

{

SearchVisualTree(child, width,Node);

}

}

}

用法：DBHelper.VisualTree(listboxname,300,"textBox1");