ant-design-blazor/src/AntBlazor/Components/AntLayout/AntLayoutHeader.razor

@namespace AntBlazor
@inherits AntDomComponentBase

<nz-header class="@ClassMapper.Class" @ref="Ref" style="@Style" @attributes="Attributes" Id="@Id">
    @ChildContent
</nz-header>

@code {

    [Parameter]
    public RenderFragment ChildContent { get; set; }

    public AntLayoutHeader()
    {
        ClassMapper.Add("ant-layout-header")
            .Add("nz-header");
    }
}