When setting the property ShowClearButton="True" for the control hc:TextBox, Click on the Clear button throws an exception.

[steveyan00]

Describe the bug
When setting the property ShowClearButton="True" for the control hc:TextBox, Click on the Clear button throws an exception.

To Reproduce
Steps to reproduce the behavior:

1. <hc:TextBox ShowClearButton="True" Text={Binding Variable} />
2. Click the Clear button and enter something.
3. 7 : ConvertBack cannot convert value '' (type 'String'). BindingExpression:Path=AIntVariable; DataItem='MainViewModel' (HashCode=xxxxxxxx); target element is 'TextBox' (Name=''); target property is 'Text' (type 'String') FormatException:'System.FormatException: Input string was not in a correct format.

Expected behavior
Add a judgment for the empty string. The value can be set to 0 if it is empty.

Screenshots

Environment (please complete the following information):

• .net: 6.0
• IDE vs2022
• Version 3.3.11

ps: The above is translated from DeepL.

[ghost1372]

#48