All Questions
688
questions
114
votes
7
answers
101k
views
How to fix "The CORS protocol does not allow specifying a wildcard (any) origin and credentials at the same time" error
I've already enabled CORS on the project in C# .net Core
In startup.cs I've added lines
...
services.AddCors();
...
app.UseCors(builder => builder
.AllowAnyOrigin()
.AllowAnyMethod()
...
- 3,274
69
votes
11
answers
73k
views
Failed to find a valid digest in the 'integrity' attribute for resource in Blazor app
I have a Blazor client/server app that I have been working on for a period and it has been working fine up to now. I suddenly started getting this error
Failed to find a valid digest in the '...
- 935
49
votes
8
answers
101k
views
.NET Core Blazor: How to get the Checkbox value if it is checked?
I am trying to find to get the checkbox value if it is checked using Blazor framework, but I couldn't find any method for it so far. When I put the binding in the checkbox, it is always checked. I ...
- 1,519
46
votes
9
answers
69k
views
How to use Bootstrap modal in Blazor client app?
I am trying to show bootstrap modal then bind its buttons. But I cannot pass the first step showing the modal. I am using Blazor client template of .net core 3.1. I have a page named Modal.razor ...
- 3,621
32
votes
4
answers
66k
views
Blazor template with menu across the top
I've created a new blazor app from the VS2019 template which has the menu as a sidebar. I've spent best part of the morning trying to get the menu across the top of the page like the current MVC ...
- 26k
30
votes
7
answers
22k
views
Auto reconnect Blazor Serverside
Blazor serverside (dotnet core 3.1)
I run into the problem that on customer side this is shown:
Could not reconnect to the server. Reload the page to restore functionality.
Each time I update the ...
- 912
27
votes
5
answers
22k
views
How to stop event propagation in Blazor Server app
I'm using Grid.Blazor library to render server side grid on Blazor app. One of the column has a button with click event. So when button is clicked then grid row event is also fired along with button ...
- 4,943
27
votes
3
answers
13k
views
What is the difference between @{} @code{} and @function{} in Blazor?
I am learning server-side. Blazor .
I have read the code of some projects and found some that use:
@{
}
and some that use:
@code{
}
and others that use:
@function{
}
to mark the code block.
I ...
- 2,814
26
votes
4
answers
30k
views
Blazor Project structure / best practices
My company is moving from a legacy codebase to a more modern platform and we are moving to Blazor. We are currently just getting involved with ORM's and best practices and there seems to be a lot of ...
- 766
24
votes
10
answers
58k
views
How to create NavMenu with collapsible submenu in .Net Core Blazor app
I am trying to create a blazor navmenu which has a shape like this
item a
item b
when I click on item b it expands with sub menu like this and clicking on subitems, new pages open
item a
item b
...
- 3,621
23
votes
3
answers
17k
views
How can I change the "Could not reconnect to the server" text in Blazor?
I am using the Blazor server-side.
When the Blazor App disconnect to the remote server, it will shows this:
I want to change the text ('Could not reconnect to the server...' and so on) of the image ...
- 2,814
23
votes
3
answers
28k
views
Passing method to component
I have been trying to work out how if its possible and how to pass a method from the main page into a component in Blazor.
I have a simple razor page, which contains a component with a button. I ...
23
votes
5
answers
14k
views
How to bind to document events with Blazor
I am writing a simple snake game with Blazor, but I can't figure out how to bind to document events. I know that it is possible to bind events on different elements such as div or input. Example: <...
- 331
22
votes
1
answer
30k
views
How to add controller (not view) support to a server-side Blazor project
While my server-side Blazor app is running, I want some Javascript code in _Host.cshtml to be able to post data to a controller action. Of course, this happens completely outside of the scope of, and ...
- 807
22
votes
2
answers
9k
views
Missing visual studio 2019 blazor webassembly app template
I updated my vs 2019 16.3.10 to 16.4 and .net core 3.0 to .net core 3.1 but the blazor web assembly application template is missing.
- 231
21
votes
5
answers
18k
views
Blazor TwoWay Binding on custom Component
I'm creating a blazor server side app and have problems to bind a value between two custom components.
I've looked through different example of how the bind or @bind is supposed to work but I cannot ...
- 588
19
votes
2
answers
10k
views
How to use subfolders in the Pages and Shared folders
I've got a Blazor Server-Side application. It has the folders Pages and Shared out-of-the-box. Since I have a lot of components in these folders, I wanted to distribute the components into multiple ...
- 2,163
17
votes
1
answer
8k
views
Convert Blazor Server App to Blazor Web-assembly approach
I want to develop an SPA project by Blazor technology.
Due to complexity of debugging the Blazor Web-assembly application, I would like to first create it as a server-side app, and then later change ...
- 173
16
votes
1
answer
5k
views
@attribute [AllowAnonymous] in Blazor server-side component has no effect
I have created a fresh Blazor server-side project with .NET Core 3.0 and have closed down the application for non-authenticated users.
I am now trying to allow anonymous access to Index.razor ...
- 1,343
15
votes
13
answers
23k
views
Event for click outside a div or element to close it on Blazor
In my Blazor server-side project, I need to close a pop-up menu by clicking outside the menu.
I use a simple If statement to show/hide the pop-up by triggering the onClick event. but there is no such ...
- 359
15
votes
5
answers
29k
views
How can I change css directly(without variable) in Blazor?
I am using the server-side of Blazor.
I want to change the CSS of the body.
In Jquery I can write the code like this easily:
$("body").css("overflow-y","hidden");
However, with this tutorial(...
- 2,814
15
votes
3
answers
10k
views
CancellationToken in Blazor Pages?
After living under a rock for 2 years employment wise, I am now confronted with Blazor at my new Workplace and have a lot of catch up to do after doing mostly ASP.NET Framework MVC prior to the 2 ...
- 438
15
votes
7
answers
15k
views
Blazor: Managing Environment Specific Variables
How can I manage access variables which differ among environments in client side blazor? Normally since I use Azure to publish applications, I'd use the appsettings.json file for local app settings ...
- 5,267
15
votes
5
answers
31k
views
Blazor Request blocked by CORS policy
I am trying to send a request from a Blazor(client-side) client to a server and i keep getting this error:
Access to fetch at '[route]' (redirected from '[other route]') from
origin '[origin ...
- 9,060
14
votes
1
answer
5k
views
Blazor exception - The current thread is not associated with the Dispatcher. Use InvokeAsync()
I my Blazor application I have such exception
System.InvalidOperationException: The current thread is not associated with the Dispatcher. Use InvokeAsync() to switch execution to the Dispatcher when ...
- 1,706
13
votes
5
answers
17k
views
Multiple query string parameters in Blazor routing
I have multiple working examples in my current project of retrieving 1 query parameter from the url however when trying to follow the same convention for multiple url params, I'm receiving the ...
- 5,267
13
votes
2
answers
6k
views
Blazor onclick event passing in counter from loop
I'm currently implementing table paging via a home grown solution in Blazor and coming across some difficulty. The troublesome piece of code is below (this is for rendering the paging buttons below a ...
- 5,267
13
votes
5
answers
34k
views
How do I upload files with Blazor?
I found the BlazorInputFile library, but there are still-open PRs from October of 2019, and I am not sure whether this library is still maintained. Also, I found a couple articles in blogs about how ...
- 333
12
votes
3
answers
18k
views
How to configure HttpClient base address in Blazor Server using IHttpClientFactory
I am trying to configure HttpClient 's base address in a Blazor Server using IHttpClientFactory but I am getting a runtime exception:
services.AddHttpClient("ApiClient", (provider, ...
- 1,330
11
votes
4
answers
7k
views
Running multiple ASP.NET Core (3.1x/Latest) websites on port 80 with Kestrel
I'm using (ASP).NET Core (3.1x), C#, Blazor and Microsoft Kestrel Web-server and I'm wondering if I can run 2 or 3 different websites (domain names) on one Kestrel instance and on port 80. I would ...
- 695
11
votes
2
answers
3k
views
Why is client-side Blazor using .NET Standard 2.0 and how to use .NET Core 3.0 with Blazor?
Is it possible to use .NET Core 2.2 or 3.0 with Blazor?
Because at this moment, the blazorhosted template creates a client-side project as .NET Standard which prevents using .NET Core 3.0.
Project ...
- 719
10
votes
2
answers
21k
views
Access Device Camera with Blazor
I have a Blazor Web Assembly PWA, how do I open a devices native camera?
I am trying to write a PWA to capture and save pictures.
EDIT
Would like to save captured images as jpeg's to Azure Blob ...
- 385
10
votes
1
answer
2k
views
How to disable an entire Blazor EditForm, along with all fields?
I'm used to the handy form.disable() method in Angular's reactive forms, which disables all bound fields in the given form group (which can be the whole form). And obviously enabling them in a similar ...
- 3,316
10
votes
1
answer
6k
views
Using @ref inside for loop to get element reference
Im trying to get the position of same object in different places, where ,with a javascript function, I should get different top positions but thats not the scenario. The script code:
<script type="...
- 197
10
votes
2
answers
16k
views
How can I get the event while page close in blazor server-side?
I am making a chatroom App by the blazor server-side.
I want to show the online state of each user.
Now I can use the OnAfterRenderAsync event to get a user has entered the page.
It seems there is ...
- 2,814
10
votes
4
answers
8k
views
Blazor Navigationmanager cancel navigation on locationchanged
Question:
Is there a way on Blazor to cancel navigation?
Let's supose a siple a href like this:
<a href="/some/other/blazor/spa/page">Go</a>
I would like to cancel navigation (...
- 50.3k
10
votes
2
answers
16k
views
Blazor inline editing table and getting all component values on event
On a Blazor component, I have this table in which I'm trying to implement inline editing functionality. I've managed the visual bits, but when it comes to grabbing the new values from the changed row ...
- 950
10
votes
4
answers
7k
views
Error Upgrading Blazor from 3.1 to 5.0 "does not have a property matching the name 'PreferExactMatches'"
As per the migration document here it recommends to add this property PreferExactMatches
When I do I get this error
InvalidOperationException: Object of type 'Microsoft.AspNetCore.Components.Routing....
- 1,585
9
votes
1
answer
4k
views
Blazor route changes in same page
I'm current setup:
.NET core 3 (preview 6)
Blazor server side rendering
In a Blazor page I have something like the following:
@page "/page"
@page "/page/{Id}"
With:
[Parameter]
public string Id { ...
- 1,559
9
votes
2
answers
4k
views
How to get/inject services in custom ValidationAttributes
We're on .NET Core 3.1.5 and this is a Blazor Server application.
We have a ValidationAttribute and need access to an external Service to validate the objects.
ValidationAttribute has the IsValid ...
- 257
9
votes
2
answers
7k
views
How can I invoke method in CircuitHandler of Blazor server-side?
I am making a chatroom application by Blazor server-side. I want to show the online state of each user.
I have asked a question for how to get the event while closing the page in How can I get the ...
- 2,814
9
votes
3
answers
7k
views
Blazor Connection Disconnected
I have a web app with Client running on Blazor Server. I have set a custom Blazor reconnect modal (<div id="components-reconnect-modal"...) as the documentation says here - Microsoft Docs
...
- 362
8
votes
1
answer
3k
views
How do I change the "Authorising..." message that appears when a Blazor PWA application is being refreshed?
When an asp net hosted BLAZOR Progressive Web Application is refreshed using browser refresh, PWA application performs an authentication roundtrip. During this time span, main content div displays ...
- 129
8
votes
4
answers
25k
views
Reading server-side files using Blazor
I have a project based on the Blazor sample with a .Client, .Server and .Shared projects. I have a textfile data.txt on the server that I want to be able to read/write using standard StreamReader / ...
- 1,768
8
votes
5
answers
19k
views
Blazor: Implementing 404 not found page
I'd like to implement a page internal to my application that appears when the blazor router is unable to find a matching route. Currently, all requests are routing to index.html so I'm unable to ...
- 5,267
8
votes
2
answers
7k
views
EF Core list of Enums
I'm working on small application with organizing hotel reservations in Entity Framework Core. I need to add information about number and the type of beds in every room. I was thinking and I decided ...
- 141
8
votes
1
answer
3k
views
Blazor pages in multiple projects
I have 3 projects
Projection.Server - this contains the host file and startups
Projection.Shared - This contains the controllers and pages (class library)
Components.Shared - This contains all ...
- 203
8
votes
2
answers
14k
views
.Net Core 3 Blazor Server - How to do basic login with claims?
I already have tables with usernames, passwords, and role IDs, so I do not want to use the ASP.NET Membership tables. And I only need a simple login page that asks for username and password, not ...
- 1,400
8
votes
1
answer
12k
views
Render Razor Partial View in Razor Component (Blazor)
I am newly discovering Blazor and have been playing with some test projects to better gauge how I might include this in future projects. Coming from an MVC background I have started with an MVC ...
8
votes
1
answer
1k
views
dotnet watch run -c $(Configuration) with hot reload
I want to launch my Blazor app with specific configuration and have hot-reload enabled.
When I launch with:
dotnet watch
Hot reload is enabled and everything it's ok.
When I lanch with:
dotnet watch ...
- 81