wpf TextBlock.GetBindingExpression 返回 NULL
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TextBlock.GetBindingExpression returning NULL
提问by blue18hutthutt
The following is returning NULL for me, any idea why?
以下是为我返回 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);
The MultiBinding is fine - the properties are valid and it renders on the UI ..I just can't seem to grab the binding expression (x is always NULL)
MultiBinding 很好 - 属性有效并且它在 UI 上呈现..我似乎无法获取绑定表达式（x 始终为 NULL）
Am I using this method wrong?
我用这个方法错了吗？
回答by Dennis
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.
此方法实际上只是 BindingOperations.GetBindingExpression 方法的便捷包装器。GetBindingExpression 将当前实例和 dp 参数传递给 BindingOperations.GetBindingExpression。
如果您的绑定是 MultiBinding，请使用 BindingOperations.GetMultiBinding。
See "Remarks" section and notes in "Examples" section here.
请参阅此处的“备注”部分和“示例”部分中的注释。
