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conficient / BlazorTemplater

A library that generates HTML (e.g. for emails) from Razor Components
Apache License 2.0
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Not able to set cascading parameter if its inherited #24

Closed tommyka closed 2 years ago

tommyka commented 2 years ago

If a component have a baseClass that it inherits from with the @inherits from a .cs file with a cascadeParameter, then its not possible to set that parameter.

It seams that when the parameters are fetched in GetParameterName that it gets the CascadingParameterAttribute instead of ParameterAttribute.

conficient commented 2 years ago

Can you give me a code sample to show the issue?

tommyka commented 2 years ago

I forked the projeckt and created a testcase to reproduce it.

https://github.com/tommyka/BlazorTemplater/commit/91fd90deef6f415618298ff9983708d18b5bc012

But for the testing i did it do not same to be possible, because it fails in web components part.

conficient commented 2 years ago

This doesn't work because CascadingParameters exist in the child component, not the parent. You've got a cascading parameter in CascadeChild.razor, that's fine.

The CascadingParameter in CascadeParentBase.cs isn't correct. It should be a normal [Parameter]. If you look in my original example, CascadeParent.razor:

<p><CascadingValue Value="Info"><CascadeChild /></CascadingValue></p>
@code
{
    [Parameter] public CascadeInfo Info { get; set; }
}

You can see the value comes from a regular parameter. Change your base to use [Parameter] it will work correctly and you can set Info.

Cascading properties use a provider-consumer model: the parent provides using a <CascadingValue> component wrapped around the child components, and the child components use [CascadingParameter] to consume the value.

Hope that clears it up.