MudBlazor MudTextField failed to bind value

I am trying to bind a value in MudTextField, but it returns the error CS0131: The left-hand side of an assignment must be a variable,property or indexer.

Is it a syntax issue which caused the error? Here's some sample code I used, but where I still failed to bind the value:

<MudTextField @bind-Value="parent.Params.FirstOrDefault(x => x.Name == 'Test')?.Value"></MudTextField>
<MudTextField @bind-Value='parent.Params.FirstOrDefault(x => x.Name == "Test")?.Value'></MudTextField>
<MudTextField @bind-Value='@(parent.Params.FirstOrDefault(x => x.Name == "Test")?.Value)'></MudTextField>

These are the models:

public class Parent
{
    public string Id { get; set;}
    public Child[] Params { get; set; }
}
public class Child 
{
    public string Name { get; set; }
    public string Value { get; set; }
}

I can use a different way to bind the value, but the LINQ / one-line-solution looks cleaner and elegant. How can I correctly bind the value to MudTextField?

You cannot do two-way binding to null. Let's imagine you edit the text field and value is assigned to 'null'. You have used '?.', haven't you? Does that even make sense? 'null' is not 'variable,property or indexer'. A one-liner should not be your goal...

@{
    Child child = parent.Params.FirstOrDefault(x => x.Name == "Name");
    
    if(child != null)
    {
        <MudTextField @bind-Value=@child.Value></MudTextField>
    }
}

@code {
    Parent parent = new();

    protected override Task OnInitializedAsync()
    {
        parent.Params = new Child[] { new Child() };
        return base.OnInitializedAsync();
    }
}