Default values for component parameters get overwritten

[danroth27]

• Create a new Razor Components app

• Add a parameter to the Counter component with a default value of 1

  [Parameter] int IncrementAmount { get; set; } = 1;
  void IncrementCount()
  {
      currentCount+=IncrementAmount;
  }

• Run the app and try the Counter on the Counter page

Expected result:

• Counter increments

Actual result:

• Counter doesn't increment - stays at zero
• The IncrementAmount parameter was overwritten to zero

[pranavkm]

@danroth27, I tried this out with a blazor application, and I see the same outcome. Moving this out to preview3 so we can figure out what the right behavior needs to be.

@SteveSandersonMS, thoughts on what the behavior should be here? ParameterCollection goes out of it's way to ensure all parameters get initialized with a value. Is there a reason we don't rely rely on the language to initialize the type to the right value?

[danroth27]

@pranavkm This works in Blazor 0.7.0 and has worked from pretty much the first release of Blazor. This is one of the first scenarios that Blazor users try out when getting started with Blazor. If this was regressed in the latest update to Blazor it needs to be addressed.