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Custom Middleware is causing Blazor Server-side page to stop working

By : Mystic Bane
Date : September 29 2020, 07:00 AM
it fixes the issue With your code , the blazor negotiate url is also been redirect so negotiate won't work .
Try below codes which avoid that :
code :
if (statusCheck && context.Request.Path.Value != "/counter"&& !context.Request.Path.Value.StartsWith("/_blazor"))
    await _next.Invoke(context);

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How to call a razor page from a Blazor component in a Server Side Blazor Application without causing a page refresh

By : fm2ahmed
Date : March 29 2020, 07:55 AM
help you fix your problem
We tried the Identity scaffolding but it has a bug in the latest Preview 8

Server-side Blazor page post to Razor page http error 400

By : Darknote
Date : March 29 2020, 07:55 AM
I hope this helps . Bad request (400) means that the server cannot understand you
The method="post" is not applicable in Blazor or any other SPA frameworks. In Blazor there is special code that prevent a post back. Of course you can force a postback, which means that your Blazor page expires, and if you try to return to it, it is rerendered, and all your previous state is lost.

Middleware redirect in Asp.net core Blazor server-side 3.0 error?

By : user3263021
Date : March 29 2020, 07:55 AM
This might help you I am currently testing out an asp.net core 3 blazor server-side app. I built a middleware extension in f#, and called it from c# within the Configure method of the Startup class. It appears to initially attempt the redirect as the correct url is called, but I get an error page stating that the page isn't redirecting properly. What am I missing here. , A redirect-loop might happens as below:
code :
                                              (redirect-loop might happens)
Request Process Starts                       <---------------------------+
 |----->  CheckMaintenanceStatusMiddleWare                               |
              (check status)                                             |
                  if fail then redirect to '/Maintenance' -------------->|
                       |----> go to inner middlewares by next(context)
if statusCheck && context.Request.Path.Value <> "/Maintenance" then
    ... redirect
    ... invoke inner middlewares

Blazor server side oninput event causing error

By : user3383060
Date : March 29 2020, 07:55 AM
this will help Note you're binding value by @bind-Value="card.Number" instead of by @bind-value:oninput. The @bind-Value directive binds value when value changes (i.e. the onchange event). And the oninput event fires before onchange: when the first keystroke event fires, the card.Number is null because the @onchange event has not arrived yet.
In order to fix that issue, you need prevent card.Number is null when checking card.Number.Length == 4 otherwise it will throw a System.NullReferenceException when the first keystroke event fires:
code :
private void FormatCreditCardNumber()
    if (card.Number.Length == 4)
    if (card.Number?.Length == 4)
        numberFormat = String.Empty;
        numberFormat = card.Number + "-";

How can I stop IDisposable invokes while render the page in blazor server-side?

By : user3668864
Date : March 29 2020, 07:55 AM
will be helpful for those in need the code snippet below is exactly like yours, and it works for me perfectly fine. The Dispose method is called only when a Circuit is closed. I'll post below the entire code I use, copy and run it, then I'll try to help with other issues you have.
code :
        @(await Html.RenderComponentAsync<App>(RenderMode.Server))
using Microsoft.AspNetCore.Components.Server.Circuits;
using System;
using System.Collections.Concurrent;
using System.Threading;
using System.Threading.Tasks;

namespace BlazorCircuitHandler.Services
public class CircuitHandlerService : CircuitHandler 
    public ConcurrentDictionary<string, Circuit> Circuits { get; set; }
    public event EventHandler CircuitsChanged;

    protected virtual void OnCircuitsChanged()
    => CircuitsChanged?.Invoke(this, EventArgs.Empty);

    public CircuitHandlerService()
        Circuits = new ConcurrentDictionary<string, Circuit>();

    public override Task OnCircuitOpenedAsync(Circuit circuit, CancellationToken cancellationToken)
        Circuits[circuit.Id] = circuit;
        return base.OnCircuitOpenedAsync(circuit, cancellationToken);

    public override Task OnCircuitClosedAsync(Circuit circuit, CancellationToken cancellationToken)

        Circuit circuitRemoved;
        Circuits.TryRemove(circuit.Id, out circuitRemoved);
        return base.OnCircuitClosedAsync(circuit, cancellationToken);

    public override Task OnConnectionDownAsync(Circuit circuit, CancellationToken cancellationToken)

        return base.OnConnectionDownAsync(circuit, cancellationToken);

    public override Task OnConnectionUpAsync(Circuit circuit, CancellationToken cancellationToken)
        return base.OnConnectionUpAsync(circuit, cancellationToken);

@page "/"

@using Microsoft.AspNetCore.Components.Server.Circuits
@using BlazorCircuitHandler.Services

@inject CircuitHandler circuitHandler
@implements IDisposable

    Number of Circuits: @((circuitHandler as 
     @foreach (var circuit in (circuitHandler as 

@code {

protected override void OnInitialized()
    (circuitHandler as CircuitHandlerService).CircuitsChanged += 


public void Dispose()

    (circuitHandler as CircuitHandlerService).CircuitsChanged -= 


public void HandleCircuitsChanged(object sender, EventArgs args)
    InvokeAsync(() => StateHasChanged());
public void ConfigureServices(IServiceCollection services)
        // Removed for brevity....

        services.AddSingleton<CircuitHandler>(new CircuitHandlerService());
        @(await Html.RenderComponentAsync<App>(RenderMode.Server))
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