Does StateHasChanged rerender all the components or only a particular component?

When StateHasChanged is called, it runs change detection on the current component and its descendants. Blazor is clever enough to rerender the components that have changes.

<h3>StateHasChanged</h3>

<button class="btn btn-primary" @onclick="Generate">Generate List</button>
<button class="btn btn-primary" @onclick="ChangeOneRow">Change State</button>

@if (list != null)
{
       @foreach (var item in list)
       {
               <li>@item</li>
       }
}

@code {
    List<int> list;
    const int cMaxNumbers = 10;

    protected void Generate()
    {
        list = new List<int>(cMaxNumbers);
        for (int i = 0; i < cMaxNumbers; i++)
        {
            list.Add(i);
        }
    }

    protected void ChangeOneRow()
    {
        list[0] = 123456;
        StateHasChanged();
    }
}

In the above example, only the first list item will be re-rendered.