Simple Parameter Passing in Blazor (Previously TempData)

I am very new to Blazor (coming from a medium level of asp.net experience).

Previously, I used ViewBag & TempData to pass variables from one component to another, quite effectively and easily. This is not available in Blazor and I am struggling to understand how to pass a variable to another component. I have, indeed, read many posts and online resources, but they don't seem to make sense to me, for what I am trying to do.

I tried to make a very simple example of what I am trying to accomplish:

When the NewEntry.razor page loads, I need to create a new GUID for the new record entry that stuff will create (newID).

[Parameter]public Guid NewRecord {get; set;} = Guid.NewGuid();private Guid newID = Guid.Empty;AddCarDialog addCarDialog; protected override OnInitialized(){newID = NewRecord;base.OnInitialized();}

Now, when I place '@newID' anywhere on the NewEntry.razor page, it shows the new GUID correctly.

I need to pass @newID to the AddCarDialog page in the shared folder. After spending more than a day on this, I am asking for help.

This is where I am at in my Showpopup code on the NewEntry.razor.cs page, that opens AddCarDialog.

protected void Showpopup(){addCarDialog.carPK = newID;addCarDialog.ShowDialog = true;}

Code for AddCarDialog.razor.cs

[Parameter]public Guid carPk {get; set} = new

Code to display on AddCarDialog.razor

@carPk

EDIT/Update:

I am now using Dimitri's example, below and not receiving any errors. However, I've noticed another issue.

When NewEntry.razor loads, AddCarDialog.razor loads twice! I set a break point in OnInitialized, to see what is happening. Here is what I know:

NewEntry.razor loads. Before fully loading, AddCarDialog loads once, and carPK is correct. Then, for some odd reason, AddCarDialog loads a second time and carPK is empty.

I need to figure out why it's loading twice here and how to stop it.