c# - TextBlock.GetBindingExpression 返回 NULL

Question

以下为我返回 NULL，知道为什么吗？

MultiBinding collectionRange = new MultiBinding();
collectionRange.Bindings.Add(new Binding("CurrentPosition") { Source = View });
collectionRange.Bindings.Add(new Binding("Count") { Source = View });
collectionRange.StringFormat = "{0} of {1}";
tbFooter.SetBinding(TextBlock.TextProperty, collectionRange);
var x = tbFooter.GetBindingExpression(TextBlock.TextProperty);

MultiBinding 很好 - 属性有效并且它在 UI 上呈现..我似乎无法获取绑定(bind)表达式(x 始终为 NULL)

我是不是用错了这个方法？

Answer 1

This method is really just a convenience wrapper around the BindingOperations.GetBindingExpression method. GetBindingExpression passes the current instance and the dp parameter to BindingOperations.GetBindingExpression.

If your binding is a MultiBinding, use BindingOperations.GetMultiBinding.

参见“备注”部分和“示例”部分中的注释 here .