How to get DependencyProperty from PropertyName in Runtime

BitSmithy 2,061

Hello,

How to get DependencyProperty from PropertyName in Runtime.

I want to write such code:

TextBox tbx = new TextBox();
tbx.SetValue(TextBox.TextProperty, "ssss");

more gerneral. I want to do something like that:

TextBox tbx; tbx.SetValue(GetDepenedencyPropertyFromPropertyName("Text"), "aaaaa")

Function

DependencyProperty GetDepenedencyPropertyFromPropertyName("Text") {}

should work in Release (not only in debug mode) mode. Is it possible to do such function in UWP.

Junjie Zhu - MSFT 17,816 Reputation points Microsoft Vendor

2024-03-29T02:40:29.38+00:00

Hi @BitSmithy ,

Could you please tell me what your specific scenario is? Why do this? Maybe we can solve it in another direction.

BitSmithy 2,061

I am looking for a way to set FrameworkElements properties if I know PropertyName. I try to avoid such code and do job in more general way:

public UpdateValue(string propertyName, FrameworkElement object, object newValue)
{ 
 If(object is TextBox tbx)

      if(propertyName is "Text")

          tbx.Text = "aaa"

 if(propertyName is "Width")

      tbx.width= 120;

....

else if(object is TextBlock tbl)

 ......

 else if(object is Rectangle rect)

  ......
}

Junjie Zhu - MSFT 17,816 Reputation points Microsoft Vendor

2024-04-01T06:20:00.5866667+00:00

In my opinion, this is not a very good approach, because propertyName is a string, there are no restrictions on it at compile time, and it is easy to make mistakes. For example, the wrong UpdateValue("text",TextBox, "newtext") will also be successfully compiled, Visual Studio won't help you find errors like this.

Accepted answer

Junjie Zhu - MSFT 17,816 Reputation points Microsoft Vendor

2024-03-29T02:38:38.7233333+00:00

Hi @BitSmithy ,

Welcome to Microsoft Q&A!

I think GetDepenedencyPropertyFromPropertyName is not a feasible method to find the correct DependencyProperty based on string, because it also needs to confirm the type of the control.

But even so, I still didn't find a suitable API to get the DependencyProperty in UWP. It is recommended that you use your original code tbx.SetValue(TextBox.TextProperty, "ssss");

Thank you.

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BitSmithy 2,061 Reputation points

2024-03-29T12:17:01.4966667+00:00

I was afraid this answer. I have additional qestion:

Is there any compilation directive which allow to control what compilator removes from metadata?

Is there any helper or something similiar that covers this removal for UIElements/FrameworkElements/Shapes

This page

https://learn.microsoft.com/en-us/windows/uwp/dotnet-native/runtime-directives-rd-xml-configuration-file-reference

suggest that I can control metadata removals, but I am not sure If my understanding is right, and how to, for example, disable metadata removal for TextBox
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