西装外套。单击倍增次数时,NavLink在foreach块中不起作用

时间:2019-10-22 21:05:10

标签: asp.net-core blazor asp.net-core-3.0

我创建了NavLink的列表,这只是它们之间的一个不同,动态参数Id

<div>
    @foreach (var service in pageGlobal.Person.Services)
    {
        var link = $"service_description/{service.Identifier}";
        <ul class="nav flex-column">
           <li class="nav-item px-3">
              <NavLink class="nav-link" href="@link">
                   @service.Name
               </NavLink>
           </li>
        </ul>
    }
</div>

并且仅当我第一次单击时它才起作用(无论它在NavLink的哪个项目中均正常工作)。

enter image description here

单击下一个链接-网址已更改,但没有任何反应。

enter image description here

ServiceDescription.razor

的代码
@page "/service_description/{Id:int}"
@using Site.Data
@using Site.ViewModels
@inject StartUpService page

@if (service != null)
{
    <div> <h3>Service Name - @service.Name</h3> - <h4>@service.Description</h4>  </div>
}

@code
{
    [Parameter]
    public int Id { get; set; }

    PageGlobal pageGlobal;
    Service service;

    protected override async Task OnInitializedAsync()
    {
        pageGlobal = await page.GetPageGlobalAsync();
        service = pageGlobal.Person.Services.Where(e => e.Identifier == Id).FirstOrDefault();
    }
}

如何使用ServiceDescription.razor功能通过新参数强制客户端重新加载NavLink

1 个答案:

答案 0 :(得分:1)

此问题是由OnInitializedAsync引起的。对于OnInitializedAsync,仅当组件准备启动时才调用该组件时才调用它。

如果要基于参数更改service,则应使用OnParametersSetAsync,如下所示:

protected override async Task OnParametersSetAsync()
{
    pageGlobal = new PageGlobal
    {
        Person = new Person()
        {
            Services = new List<Service>(){
                new Service{ Identifier = 1, Name = "Test1", Description = "D1" },
                new Service{ Identifier = 2, Name = "Test2" , Description = "D2" },
                new Service{ Identifier = 3, Name = "Test3", Description = "D3"  }
            }
        }
    };
    service = pageGlobal.Person.Services.Where(e => e.Identifier == Id).FirstOrDefault();

}

您可以检查ComponentBase