Do you get it ? @steveharter @inject HttpClient Httpclient <button @onclick="@GetData">Get Data</button> @code { private async Task GetData . Stack Overflow - Where Developers Learn, Share, & Build Careers Or are you suggesting I move the app to Blazor 5.0.0 latest preview? We can call methods in our library that do some pretty complicated geometry stuff and they run at near native speed. See info in area-owners.md if you want to be subscribed. This indicates a likely environmental or systemic issue, and not likely a (de)serialization issue. You can find the corresponding benchmark WasmComparison here: Here's the resulting browser console log from running the above code: Using Newtonsoft.Json (as in the commented-out line) instead of System.Text.Json gives very similar results. The initial release target is to ship this as a standalone NuGet package at Build, alongside Blazor, which will utilise the APIs. This is where we populate a form with our Team entity, which includes name, shirt colour and location. How to deserialize json file on Blazor Server? : r/Blazor - reddit How can I pretty-print JSON in a shell script? The timings were again similar. RestClient.Net can do that in Blazor without the extra step. Different hardware and\or different Blazor versions could account for that 2x-3x slowness; would need a standard CPU benchmark and same Blazor version to actually compare apples-to-apples.". Create or load a JSON file under the wwwroot folder. We are developing a blazor wasm application and deserializing a ~1.8 MB JSON payload takes about 5-6 seconds (time to complete network request is not part of that time). ), My download of 2-6 MB takes 1-6 seconds, but the rest of the operation (during which the UI is blocked) takes 10-30 seconds. Tagging subscribers to this area: @CoffeeFlux Sign in I see total time including serialization to get thousands of weather forecast lines cut in half when using .NET 5.0.0-rc1 in release configuration. When the task completes, continue execution; that is, call UriHelper.NavigateTo('/Dashboard') synchronously. If you have write-permissions please help me learn by adding exactly one area label. The Blazor/WASM community has generally always expressed that code runs at native speeds (until you learn that everything outside of the .net libraries is interpreted) and I had hoped AOT would make an enormous difference here, allowing Messagepack serialiser to run at native speed. Just tried outside of VS -- using dotnet run at the command line in Windows. a Web API Core 3.0 Project, nothing fency, getting data at startup in the Index razor page is We were excited with the possibility of running some of our code in our web application. Is the test running in isolation on dedicated hardware or is it hosted? The StackOverflow test runs <4 seconds for @HenkHolterman and 7-12 seconds for @szalapski. Thanks for the reply. gRPC deserialization is 10 times faster, Check it out here: https://grpcblazorperf.azurewebsites.net. Well occasionally send you account related emails. Above way page routing happened once data fetch complete. I'll add my support for @szalapski here. rev2022.11.3.43005. https://github.com/hypar-io/Elements/tree/wasm-perf/Elements.Benchmarks. (I've replaced a call to GetFromJsonAsync with code from inside it, to narrow down the slow part. This doesn't seem right to me. See https://stackoverflow.com/q/63254162/. I suggest running the perf test that @HenkHolterman suggested in stackoverflow to compare against the baseline. We're really excited for the effort to bring C# to web assembly and are happy to provide any further information necessary. Microsoft Graph SDKs are designed to simplify building high-quality, efficient, and resilient applications that access Microsoft Graph. How to Consume Web APIs in Blazor -- Visual Studio Magazine Since the Web API works with data from the SQL database, all you have to do is to modify the connection string in the appsettings.json file and start the application. I have tried like this below code, Error CS0029 - Cannot implicitly convert type System.Threading.Tasks.Task' to 'Application1.Models.DBModel'. Solution 2. Blazor - GetJsonAsync doesn't accept null in the json from API Issue That's us injecting HttpClient, from the top of the file: @inject HttpClient http Much like a normal .NET Core app, you can use dependency injection to inject a service into a Razor component. I advice you to take some time to learn more about async/await. which explained me I had to use the HttpClientJsonExtensions, as mentioned in next fragment from the site: So, after downloading the samples and having a quick look at the RestApi.Client project (which contains the C# - Get and send JSON with HttpClient | MAKOLYTE This example sends a new article in the postBody to the /api/articles route and then converts the response to an Article object and assigns it to the blazor component property article so it can be displayed in the component template. (Download time on localhost is about 20 ms.). @rajeshaz09 I assume you've measured against 5.0 .NET since there have been gains. After adding the Microsoft Graph API scopes in the AAD area of the Azure portal: Add the following GraphClientExtensions.cs class to the standalone app or Client app of a hosted Blazor WebAssembly solution. I created a Blazor Server App which gets its data from When we submit the form, it fires a POST request to the API and returns the full entity back, including the ID as a response. Is there any certain types or techniques that could speed this up? Use Graph API with ASP.NET Core Blazor WebAssembly Or advice how to route a page after data fetch got success. public class ApiResponse { public int offset { get; set; } public int total { get; set; } public NameRec [] names { get; set; } } public class NameRec { public string name { get; set; } } ps. JsonSerializer.Deserialize is intolerably slow in Blazor - GitHub First, and most importantly, thanks to the team working on Blazor and web assembly. Running the Blazor code compiled using dotnet run -c release (non AOT) and viewing the console in Chrome shows: We found that AOT compilation (which takes nearly 15 minutes), increases the performance by 2x. For example, set Scopes to a string array of one scope for User.Read for the examples in the following sections of this article: In Program.cs, add the Graph client services and configuration with the AddGraphClient extension method: The scope placeholders "{SCOPE 1}", "{SCOPE 2}", "{SCOPE X}" in the preceding code represent one or more permitted scopes. Already on GitHub? Confirm correct package versions at NuGet.org. Customize user claims with the Graph SDK. Here's the code before my performance refactoring. (FYI, this is on Blazor 3.2.0; I also updated System.Text.Json via NuGet to v 5.0.0-preview.7, but it didn't help much. @pandiyaraj678, this is not my solution. As you can see from the code, I've passed a type parameter to the GetJsonAsync method. In Program.cs, configure the MSAL authentication to use the custom user account factory: If the app uses a custom user account class that extends RemoteUserAccount, swap the custom user account class for RemoteUserAccount in the following code: The examples in this section use a named HttpClient for Graph API to obtain a user's mobile phone number to process a call. I didn't see much difference (Hardly 1 second) between STJ and MessagePack with HighPerformance power setting. but thought I'd ask--anything else we could do to "help" the deserializer along for collections with thousands of items? Can an autistic person with difficulty making eye contact survive in the workplace? Developer_.Net- Blazor WebAssembly_Stockholm, Sweden Sign in If you face issue with JSON serialization performence , before trying to solve by refatoring your code, please check performeance in another browser, Blazor work realy fast on Edge, Opera, Chrome, but performance in Firefox is realy wick - slowdown serialization more than 10 times. Add a UserInfo.cs class to the app and designate the required user profile properties with the JsonPropertyNameAttribute attribute and the JSON name used by AAD for those properties: The preceding example is for an app that uses AAD authentication with MSAL. CRUD Operations Using Blazor, .Net 6.0, Entity Framework Core Easily Create A Real-time Application With Blazor And SignalR If so, I already have the latest preview. The client deserializes that using HttpClient.GetFromJsonAsync(string). I'm already avoiding non-generic lists and objects that are of type System.Object. Could not find GetJsonAsync in HttpClient class #15430 - GitHub Provide the required scopes to the Scopes . Describe the bug httpClient.GetJsonAsync is unable to parse JSON downloaded from API that contain null value To Reproduce @shipList @code { private List<Ship> shipList; HttpClient httpClient = new HttpClient() { BaseAddress = new Uri("ht. Let's create a description of a dynamic component: I couldn't figure out the best area label to add to this issue. But, unfortunately I can NOT use the GetJsonAsync() method here, as shown from the GitHub samples I assume you want the value for data before you want to go the a different page, so what you had before is already correct. Blazor API Handling | FREE Blazor Crash Course (.NET 5) Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Follow these steps to read the JSON file. Step 3 Step 4 Here we will select Framework type as .NET 6.0 and also select the ASP.NET Core hosted option. The test is running on my laptop. Code language: plaintext (plaintext) Here's an example of serializing an object into JSON with Newtonsoft and then sending it with HttpClient: Hi. It indeed takes 7-12 seconds to return 17000 items (about 1.6 MB) of WeatherForecast. Why don't we consider drain-bulk voltage instead of source-bulk voltage in body effect? @tareqimbasher are you running on Blazor 5? Making statements based on opinion; back them up with references or personal experience. Await = stop here and wait for the task to finish and return the result (if any). We use several third party dlls that we had to compile with .NET 6 as well to even get the publishing of the Blazor project to work. Step 1 Step 2 In this step we will select " Blazor WebAssembly App " project type. protected override async Task OnInitializedAsync() { image = await http.GetFromJsonAsync<Data.Image>("api/image"); } Wait, what is that http reference? In the following component code, the todoItemsare displayed by the component. You can avoid this exception by one of these solutions: Solution 1. How to Build a Blog using Blazor WASM & Strapi @enetstudio : Actually i am using client side blazor application, your solution not work with my scenario. The green is the download and the orange is "perform microtasks", which I assume means WebAssembly work. We will implement a simple data table and populate its data using an API call from the Blazor web application to an ASP.NET WebAPI . Similar patterns exist for OIDC and API authentication. The following example configures the handler for the User.Read scope. Use the HttpClient class with the GetFromJsonAsync () method to read a JSON file in Blazor WebAssembly. More info about Internet Explorer and Microsoft Edge, Package consumption workflow (NuGet documentation), Call Graph API from a component using the Graph SDK, Customize user claims with Graph API and a named client, Utility base component classes to manage a DI scope, Detect transient disposables in Blazor WebAssembly apps. ), (also, I tried to increase the payload to 5 MB and that took 23-27 seconds.). How to serialize and deserialize JSON using C# - .NET privacy statement. Blazor - Learn Entity Framework Core 5 We can register this as a Singleton (if we're using Blazor Web Assembly, in program.cs). This is the type I want the response deserialized into. Blazor is a framework for building interactive client-side web UI with .NET. Blazor Server Side against Net5 WebAPI - GetFromJsonAsync returns It's a pleasure to use. 2022 Moderator Election Q&A Question Collection. I will consider gRPC but it's not my preferred way to fix this. Blazor is a free and open-source web framework that enables developers to create web apps using C# and HTML. How to help a successful high schooler who is failing in college? The learn-blazor site had been created at a point in time when there was no Blazor documentation at all available. GetFromJsonAsync (HttpClient, Uri, Type, JsonSerializerOptions, CancellationToken) Sends a GET request to the specified Uri and returns the value that results from deserializing the response body as JSON in an asynchronous operation. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Foo is actually as follows, with minimal name changes only to protect the proprietary. Different hardware and\or different Blazor versions could account for that 2x-3x slowness; would need a standard CPU benchmark and same Blazor version to actually compare apples-to-apples. In either case, since both Newtonsoft and STJ are slow there is likely something else going on. Already on GitHub? Our initial benchmarks of rc1 are showing it to be slower in this area than interpreted mode. Select Blazor WebAssembly app and click on the Next button. We have an .NET open source library that is used heavily in back end services run on AWS Lambda. For now we've had to build our own. Since then, the framework has grown and matured a lot. Anyhow, your new code snippet, which you say is working, is actually the first code snippet implemented in two methods, and thus, if it works as two methods, it should work as a single combined method. I posted an MCVE as answer on StackOverflow, based on the WeatherForecast page. Yes this will allow the deserializer to start before all of the data is read from the Stream and prevent the string alloc. Share server-side and client-side app logic written in .NET. Is it OK to check indirectly in a Bash if statement for exit codes if they are multiple? Now read what you wrote again: In the following custom user account factory, the framework's RemoteUserAccount represents the user's account. In blazor C#, httpclient.getjsonasync() method is not found - CodeProject Http GetJsonAsync returns null from server API .net-core blazor c# entity-framework-core Question I am trying to create an application using Blazor and .NET Core 3 with EF Core 3. Copyright 2001 - 2022 Syncfusion Inc. All Rights Reserved. This may be the root of the problem. Call Graph API from a component using the Graph SDK. When I attempt the same set of code in an automated integration test, it only takes 3 seconds or so (the download time). This also includes a "polymorphic" mode due to using System.Object that causes deserialization to be much slower (almost 2x) than without it. @szalapski I can confirm without a doubt that the slowness is with the deserialization and not a system or environment issue. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In this crash course, we build an actual Blazor WebAssembly application based on .NET 5. You'll need to tick the "Include pre-release" option in the NuGet package manager, because the package hasn't been fully released yet: NuGet Gallery | Microsoft.AspNetCore.Blazor.HttpClient 3.1.-preview1.19508.20 [ ^] 3 solutions Top Rated Most Recent Solution 3 It's required to add using Microsoft.AspNetCore.Components We have the exact same problem. The text was updated successfully, but these errors were encountered: UriHelper.NavigateTo is called only after the GetJsonAsync is completed. Here we will create a new project using Blazor WebAssembly App and .Net 6.0. In Startup.cs, add HttpClient to DI container: In your "service" class, inject HttpClient via constructor: Then you should be able to use the HTTP and deserialization like this: Note: as you are already running the application on the server, in case your API is located on the same server that serves the application, you possibly do not need to call the API via HttpClient; instead, you could directly instantiate your business objects (the same what you now do in your API controller). I see this is being targeted for .NET7. For example, here we have created a simple employee.json file and read its values in a Razor component. We have a similar performance degradation for serializing and deserializing JSON. to your account, In my Blazor app, I have a component that has a method like this. I just did that comparison to ensure that the download speed is not relevant--regardless of whether the download is 20 ms or 20,000 ms, the deserialization is quite slow. There are two hosting models available for Blazor. In your Blazor app use this code to automatically deserialize: await Http.GetFromJsonAsync<ComponentDto>(.) It is taking 2 seconds. This performance degradation is not everywhere. For what it's worth, here's the Chrome performance graph. Why so many wires in my old light fixture? For example, here we have created a simple employee.json file and read its values in a Razor component. How to use Http.GetJsonAsync() in Blazor Server App? If the app requires a custom user account class that extends RemoteUserAccount, swap the custom user account class for RemoteUserAccount in the following code. I established a small benchmark that creates 1000 cubes using the library (the library is for creating 3d stuff with lots of Vector3 structs and Polygon), serializes them to JSON, then writes the resulting 3D model to glTF. Either way, serialisation is painfully slow for what is really not that much data. Note: Compare this with the one-liner httpClient.GetFromJsonAsync<Stock>(url); This outputs: Stock VTSAX (MutualFund) = 107. Doesn't solve the issue but from https://twitter.com/JamesNK/status/1310875638585204738 it looks like gRPC is a lot faster to deserialize: I wrote a Blazor WebAssembly app that shows the performance benefits of gRPC-Web compared to JSON. https://stackoverflow.com/questions/63254162, https://twitter.com/JamesNK/status/1310875638585204738, https://github.com/hypar-io/Elements/tree/wasm-perf/Elements.Wasm, https://github.com/hypar-io/Elements/tree/wasm-perf/Elements.Benchmarks, Can you share your hardware specs? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Refer to this documentation for more details. What is the deepest Stockfish evaluation of the standard initial position that has ever been done? Making location easier for developers with new data primitives, Stop requiring only one assertion per unit test: Multiple assertions are fine, Mobile app infrastructure being decommissioned. Fastest decay of Fourier transform of function of (one-sided or two-sided) exponential decay. When you 'll create a blazor project then you 'll have to choose blazor server app. https://www.youtube.com/watch?v=2moh18sh5p4. Performance Vs System.Text.Json is impressive. deserialization to an array of Customers. I'm using Blazor 3.2.0 with System.Text.Json 5.0.0-preview.7. We have a couple of demos of interactive 3d geometry editing and display using Blazor wasm. The examples in this section require a package reference for Microsoft.Extensions.Http for the standalone or Client app. Yes, I used the extensions, but when I saw they were slow, I refactored to the code above so I could narrow the issue down to serialization. However, there are a couple areas known to be slow that could be made faster in the serializer. The requested data as a json-string which is finally deserialized to the required object-type. [wwwroot/employee.json] With large data sets: Anytime we want to display profile details in any component we can bind to it Transformer 220/380/440 V 24 V explanation. By clicking Sign up for GitHub, you agree to our terms of service and It will not be used for any other purpose. System.Text.Json should be ~2x faster for deserialization than Newtonsoft so it would be good to see your object model to see if you hit an area that is slow on STJ. In VS2019 (Version 16.3.8) for ordering pizzas. @szalapski OK thanks for clarifying on the download speed. I have powerful dev machine. Why Blazor Wasm is the Best Choice for API Integration

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