您需要将数据及其状态从表示中分离出来。许多组件没有表现出关注点的分离：数据访问、数据管理和状态、以及数据显示都集成到一个页面中。
这可能完全离谱：如果是的话，我会删除答案。
去柜台吧。
我们可以创建一个计数器状态对象：

public class CounterState
    {
        public Guid CounterId { get; } = Guid.NewGuid();
        public int Counter { get; private set; }
        public string Name => this.CounterId.ToString().Substring(0, 4);

        public void Increment()
            => Counter++;
    }

用于管理数据的服务-在本例中为计数器对象列表：

public class CounterViewService
{
    public CounterState CounterState { get; private set; }

    public List<CounterState> Items { get; set; } = new();

    public event EventHandler? CounterChanged;

    public CounterViewService()
    {
       this.CounterState = new CounterState();
        Items.Add(this.CounterState);
    }

    public void SetCounter(CounterState item)
    { 
        this.CounterState = item;
        this.CounterChanged?.Invoke(item, EventArgs.Empty);
    }

    public void AddCounterState()
    {
        var item = new CounterState();
        this.Items.Add(item);
        this.CounterState = item;
    }
    public void Increment()
    {
        this.CounterState.Increment();
        this.CounterChanged?.Invoke(this.CounterState, EventArgs.Empty);
    }
}

注册为如下服务：

builder.Services.AddRazorPages();
builder.Services.AddServerSideBlazor();
builder.Services.AddScoped<CounterViewService>();
builder.Services.AddSingleton<WeatherForecastService>();

显示计数器状态的计数器组件：

@inject CounterViewService Service
@implements IDisposable

<div class="bg-dark text-white p-2 m-2">
    <h3>Counter Display @Service.CounterState.Name</h3>
    <div>Counter : @Service.CounterState.Counter</div>
    <div class="m-2">
        <button class="btn btn-light" @onclick="IncrementCount">Increment me</button>
    </div>
</div>

@code {
    protected override void OnInitialized()
        => this.Service.CounterChanged += this.OnChange;

    private void IncrementCount()
    => this.Service.Increment();

    private void OnChange(object? sender, EventArgs e)
        => this.StateHasChanged();

    public void Dispose()
        => this.Service.CounterChanged -= this.OnChange;
}

最后是显示页面：

@inject CounterViewService Service
@page "/counter"

<PageTitle>Counter</PageTitle>

<CounterDisplay />

<div class="m-2">
    <button class="btn btn-primary me-2" @onclick=this.AddCounter>AddCounter</button>
    @foreach (var counter in Service.Items)
    {
        <button class="btn btn-secondary me-2" @onclick="() => this.SelectCounter(counter)">Select Counter @(counter.CounterId.ToString().Substring(0, 4))</button>
    }
</div>

@code {
    private void AddCounter()
        => this.Service.AddCounterState();

    private void SelectCounter(CounterState counter)
        => this.Service.SetCounter(counter);
}

屏幕截图显示它的运行情况：

这就是我需要的...
RazorParent.razor:

//Soemthing like ContentPresenter in the WPF
< DoesExistSomethingLikeThis Content="@RazChild" />

<a @OnClick="DisplayConfiguredRazChild">...
<a @OnClick="DisplayEmptyRazChild">...

RazorParent.剃刀@代码：

RazorChildren RazChild {get;set;} = null;

void DisplayConfiguredRazChild()
{
RazorChildren razChild = new RazorChildren();
razChild.Configure();
RazChild = razChild;
StateHasChanged();
}

void DisplayEmptyRazChild()
{
RazorChildren razChild = new RazorChildren();
RazChild = razChild;
StateHasChanged();
}

或者，如果存在类似于您创建视图并在后面的代码中配置它，然后通过绑定显示它，并仍然通过创建的示例控制它......或者，您必须始终执行以下操作：

<RazorChildren @ref="_razChildRef" Param1="@RazChild.Param1"/>

不幸的是，你不能控制原始示例。有没有可能在Blazor中创建像WPF ContentPresenter这样的东西？在那里你只绑定ComponentBase示例？这将是惊人的，我知道有RenderFragment，DynamicComponent等...但没有什么可以取代这种行为，你只需要直接绑定ComponentBased组件...没有重复的引用示例和在剃刀中传递参数。