Label.razor

@using System.Reflection
@using System.Linq.Expressions;
@using System.ComponentModel
@using System.ComponentModel.DataAnnotations

@typeparam T

 <label for="@control">@label</label>

@code {

    protected override void OnInitialized()
    {
        base.OnInitialized();

        var expression = (MemberExpression)For.Body;
        control = expression.Member.Name;

        if (expression.Member.GetCustomAttribute(typeof(DisplayAttribute)) is DisplayAttribute a1)
        {
            label = a1.Name;
            return;
        }

        // just in case DisplayName is used instead
        if (expression.Member.GetCustomAttribute(typeof(DisplayNameAttribute)) is DisplayNameAttribute a2)
        {
            label = a2.DisplayName;
            return;
        }

        label = control;
    }

    [Parameter] public Expression<Func<T>> For { get; set; }

    private string label;

    private string control;
}