如何访问 WPF 中 ComboBox 内的 ScrollViewer? [英] How can I get access to the ScrollViewer inside a ComboBox in WPF?

问题描述

ComboBox 控件模板有一个 ScrollViewer.如何从 ComboBox 的实例中获取对它的引用?

The ComboBox Control Template has a ScrollViewer. How can I get a reference to it from an instance of a ComboBox?

我尝试将其命名为ScrollViwer1"并使用它，但没有成功.

I tried naming it "ScrollViwer1" and using this, but I had no success.

var scroll = FindVisualChildByName<ScrollViewer>(this.comboBox, "ScrollViewer1");



  public static T FindVisualChildByName<T>(DependencyObject parent, string name) where T : DependencyObject
        {
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
            {
                var child = VisualTreeHelper.GetChild(parent, i);
                string controlName = child.GetValue(Control.NameProperty) as string;
                if (controlName == name)
                {
                    return child as T;
                }
                else
                {
                    T result = FindVisualChildByName<T>(child, name);
                    if (result != null)
                        return result;
                }
            }
            return null;
        }

推荐答案

您可以使用 FrameworkTemplate.FindName 方法.

ScrollViewer sv = comboBox.Template.FindName("DropDownScrollViewer", comboBox) as ScrollViewer;
if (sv != null)
{
    // do something...
}

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