Ambientvalueattribute for C#

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What is the difference between AmbientValueAttribute and DefaultValueAttribute in c# winform? I find that they are used to set default values, and feel that the presence of AmbientValueAttribute is superfluous.

What I have tried:

I've seen the source code for Microsoft's winform control library and can't tell the difference.

Posted 27-Jul-23 4:28am

Member 14475436

Updated 28-Jul-23 4:56am

Andre Oosthuizen

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Richard MacCutchan · Answer 1 · 2023-07-27T04:42:00

Solution 1

See AmbientValueAttribute Class (System.ComponentModel) | Microsoft Learn[^].

Posted 27-Jul-23 4:42am

Richard MacCutchan

Comments

Member 14475436 27-Jul-23 11:42am

This example doesn't show the use of AmbientValue at all, only the use of DefaultValue.

Richard MacCutchan 27-Jul-23 12:31pm

Yes it does, read it again.

Member 14475436 29-Jul-23 1:20am

I looked at the annotation and explained that the visual designer uses the AmbientValueAttribute Attribute attribute to determine the value of the attribute to keep. Is it my understanding that an environment attribute must be AmbientValueAttribute? Because I'm writing a new environment attribute that works fine without the AmbientValueAttribute annotation. There is also Microsoft official Control library source code Control.cs BackColor, and ForeColor are environmental attributes but not marked with this feature, while the Font environment attribute is marked AmbientValue(null). My question is when exactly is the AmbientValueAttribute used?

Richard MacCutchan 29-Jul-23 3:41am

Sorry, I have not used this attribute so do not know the answer.

Member 14475436 27-Jul-23 11:46am

In this example, DefaultValue has done the default value function, and following the parent property change has been implemented in the get accessor of AlertForeColor. What is AmbientValue used for