DependencyProperty with string value

05 Sep 2013, 05:33

What is the proper way to implement a DependencyProperty that represents a string value? I have a simple UserControl object that is basically just some text blocks whose text I want to expose with Dependency Properties so I may set it programmatically. I have these properties as NsStrings right now but I get compilation errors when using NsProp.

Should the values be cast to NsStrings, or should it be another type? Do the function pointers provided to NsProp need to be of a certain signature? Right now for my setter I am passing in a NsString which I don't really want to do (I'd rather pass in a const NsString& or an NsString*).

I'm curious what the best way to do this is - the examples only seem to cover numeric types.

06 Sep 2013, 00:26

The functions passed to NsProp must use const NsString&:

const NsString& MyClass::GetText() const
{
    return GetValue<NsString>(TextProperty);
}

void MyClass::SetText(const NsString& text)
{
    SetValue<NsString>(TextProperty, text);
}

...
NsProp("Text", &MyClass::GetText, &MyClass::SetText);

The property is registered using the NsString type:

data->RegisterProperty<NsString>(TextProperty, "Text",
    FrameworkPropertyMetadata::Create(NsString(), FrameworkOptions_None));

06 Sep 2013, 01:00

Thanks!

06 Sep 2013, 02:39

Hi,
I have a question which could be related this.
I also have some UserControl contaning some strings.
Right now i am using string not NsString, and it's working. Is it correct to use string for dependcy properties in Unity?
Thanks in advance.

06 Sep 2013, 12:21

Hi,
I have a question which could be related this.
I also have some UserControl contaning some strings.
Right now i am using string not NsString, and it's working. Is it correct to use string for dependcy properties in Unity?
Thanks in advance.

Yes, mono strings are automatically converted to native NsString, so that is the correct way to define a string property in Unity.

06 Sep 2013, 16:19

ok thanks

DependencyProperty with string value

DependencyProperty with string value

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