題
我需要知道當前頁面的網址，以檢查是否必須將某些樣式應用於元素。下面的代碼是一個示例。
@using Microsoft.AspNetCore.Blazor.Services
@inject IUriHelper UriHelper
@implements IDisposable
<h1>@url</h1>
<nav>
<div class="nav-wrapper">
<a href="#" class="brand-logo">Blazor</a>
<ul id="nav-mobile" class="right hide-on-med-and-down">
<li>
<NavLink href="/" Match=NavLinkMatch.All>
Home
</NavLink>
</li>
<li>
<NavLink href="/counter">
Counter
</NavLink>
</li>
<li>
<NavLink href="/fetchdata">
Fetch data
</NavLink>
</li>
</ul>
</div>
</nav>
@functions {
private string url = string.Empty;
protected override void OnInit()
{
url = UriHelper.GetAbsoluteUri();
UriHelper.OnLocationChanged += OnLocationChanged;
}
private void OnLocationChanged(object sender, LocationChangedEventArgs e)
{
url = newUriAbsolute;
}
public void Dispose()
{
UriHelper.OnLocationChanged -= OnLocationChanged;
}
}
我使用了Blazor信息庫中NavLink組件中使用的相同方法，但是沒有用。有任何想法嗎？。
熱門答案
使用NavigationManager.Uri 。
從注入中獲取它，然後在.razor頁面上使用它：
@inject NavigationManager NavigationManager
或者，如果您更喜歡“代碼隱藏”體驗，請在.cs這樣：
using Microsoft.AspNetCore.Components;
...
[Inject]
public NavigationManager NavigationManager {get; set;}
樣品
@page "/navigate"
@inject NavigationManager NavigationManager
<h1>Current url</h1>
<p>@(NavigationManager.Uri)</p>
有關導航的更多信息，請訪問： URI和導航狀態幫助器
NavigationManager速查表
MyNavigationManager.Uri
#> https://localhost:5001/counter/3?q=hi
MyNavigationManager.BaseUri`
#> https://localhost:5001/
MyNavigationManager.NavigateTo("http://new location")
#> Navigates to new location
MyNavigationManager.LocationChanged
#> An event that fires when the navigation location has changed.
MyNavigationManager.ToAbsoluteUri("pepe")
#> https://localhost:5001/pepe
MyNavigationManager.ToBaseRelativePath( MyNavigationManager.BaseUri)
#> counter/3?q=hi
Helper: AddQueryParm( "q2", "bye" )
#> https://localhost:5001/counter/3?q=hi&q2=bye
Helper: GetQueryParm( "q" )
#> hi
輔助程式碼：
@code {
[Parameter]
public string Id { get; set; }
// blazor: add parm to url
string AddQueryParm(string parmName, string parmValue)
{
var uriBuilder = new UriBuilder(MyNavigationManager.Uri);
var q = System.Web.HttpUtility.ParseQueryString(uriBuilder.Query);
q[parmName] = parmValue;
uriBuilder.Query = q.ToString();
var newUrl = uriBuilder.ToString();
return newUrl;
}
// blazor: get query parm from url
string GetQueryParm(string parmName)
{
var uriBuilder = new UriBuilder(MyNavigationManager.Uri);
var q = System.Web.HttpUtility.ParseQueryString(uriBuilder.Query);
return q[parmName] ?? "";
}
}
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