I spend a fair amount of time trying to understand how to bind an ASP.net Core 5 MVC form to an Entity property consisting of a List of another Entities. After all my goofs, it was surprisingly simple. Here is the solution I found:

Below is the model. First create the MainEntity with a property that is a List of SubEntities.

// The Model

public Class MainEntity
   public List<SubEntity> Examples {get; set:}

public Class SubEntity
   public string Example {get; set;}
   public string ExampleTwo {get; set }


In the controller, bind the form to the Entity like the following:

public async Task<IActionResult> Edit(Guid id, [Bind("SubEntity")] MainEntity mainEntity)
   // ... your code here
   return RedirectToAction(nameof(Index));


The form (in my case generated by Javascript) should look something like:

<input asp-for="Examples[i].Example" />
<input asp-for="Examples[i].ExampleTwo" />

The "i" above should be incremented in a for loop for indexing.