因此,我有一个Blazor应用程序,其中用户登录,并且标题组件根据用户是否登录而变化。使用登录后,它们将被重定向到主页,但是除非单击浏览器上的“刷新”按钮,否则标题组件不会更新。我尝试使用StateHasChanged()
。这是我在标头组件中的相关代码:
@using Newtonsoft.Json
@inject IJSRuntime JsRuntime
@inject NavigationManager NavManager
@if (!string.IsNullOrWhiteSpace(FirstName))
{
<div class="header-user-widget">
<button class="btn btn-cart">
Cart <span class="badge badge-cart">@CartCount</span>
</button>
<i class="fa fa-user-circle"></i> @FirstName @LastName
<i class="fa fa-sign-out-alt header-sign-out" @onclick="SignOutClicked"></i>
</div>
}
@code {
private string FirstName { get; set; }
private string LastName { get; set; }
private int CartCount { get; set; }
protected override async Task OnInitializedAsync()
{
var page = NavManager.ToBaseRelativePath(NavManager.Uri).ToLower();
var cookie = await JsRuntime.InvokeAsync<string>("Cookies.get", "Login");
if (!page.StartsWith("login"))
{
if (string.IsNullOrWhiteSpace(cookie))
{
NavManager.NavigateTo("/Login");
return;
}
}
if (!string.IsNullOrWhiteSpace(cookie))
{
var decodedCookie = cookie.FromBase64String();
FirstName = CookieHelper.GetValueFromKey(decodedCookie, "FirstName");
LastName = CookieHelper.GetValueFromKey(decodedCookie, "LastName");
}
CartCount = await NumberOfItemsInCart();
}
}
这是我的登录页面:
@page "/login"
@inject IJSRuntime JsRuntime
@inject NavigationManager NavManager
<LoginBox OnLoginButtonClick="@LoginButtonClicked" />
@code {
private async Task LoginButtonClicked(LoginBoxReturnModel model)
{
var cookieString = $"UserId={model.UserId}|FirstName={model.FirstName}|LastName={model.LastName}|Email={model.EmailAddress}|IsAdmin={model.IsAdmin}";
var encyptedString = cookieString.ToEncryptedBase64String();
await JsRuntime.InvokeVoidAsync("Cookies.set", "Login", encyptedString);
StateHasChanged(); // This line doesn't seem to have any effect
NavManager.NavigateTo("/");
}
}
用户登录后,他们将被正确重定向到"/"
页面,但标题不会更新。如果我在浏览器中按F5刷新它,则标题正确。我感觉正在发生的事情是,应用程序正在导航,而StateHasChanged()
行没有任何刷新时间,因此它永远不会刷新。如果是这样,我应该如何实施呢?
答案 0 :(得分:2)
将StateHasChanged()拖放到“ /登录”到“ /”之间。 true应该像f5那样强制加载cookie。
NavManager.NavigateTo("/",true);