Csharp MudRadioGroup不切换

我的剃刀页面上有这样的放射组

<MudRadioGroup T="string" SelectedOption="@selectedName" SelectedOptionChanged="OnSelectedOptionChanged">
                <MudRadio Option="@("Adam")" Color="Color.Primary">Index</MudRadio>
                <MudRadio Option="@("Greg")" Color="Color.Primary">Regex</MudRadio>
 </MudRadioGroup>
 @if (_isOk)
 {
      <MudTextField Value="@prop1" Label="txt1" />
      <MudTextField Value="@prop2" Label="txt2" />
  }
  else
  {
      <MudTextField Value="prop3" Label="txt3" />
  }

在代码隐藏中，我绑定了如下所示的单选群组

 private string selectedName = string.Empty;
 private bool _isOk;
 protected override void OnInitialized()
 {
    if (string.IsNullOrEmpty(ScanRule.RegexRule))
    {
        selectedName = "Adam";
        _isOk= true;
    }
    else
    {
        selectedName = "Greg";
        _isOk= false;
    }
  }

 private void OnSelectedOptionChanged(string selectedOption)
 {
    _isOk= selectedOption == "Adam";
 }

如果我try 更改选项按钮，则不会发生任何react .当我在OnseltedOptionChanged方法中设置调试点并try 更改选项按钮时，它两次进入它，我认为这也是错误的.