getfromjsonasync blazor

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. Not the answer you're looking for? To do this, we'll create an Index.razor.cs file. Blazor is an unsupported experimental web framework that shouldn't be used for production workloads at this time. Why shouldn't it be on the order of tens of milliseconds? The following class and configuration are used in each of the following subsections of this article: After adding the Microsoft Graph API scopes in the AAD area of the Azure portal, provide the required scopes to the app's configured handler for Graph API. For more information, see Supported collection types in System.Text.Json.. You can implement custom converters to handle additional types or to provide functionality that isn't supported by the built-in converters.. How to read JSON as .NET objects (deserialize) A common way to deserialize JSON is to first create a class with properties and fields that represent one or more of the JSON properties. How can I diagnose that? You'll want to avoid creating a string from the content and use a Stream instead. There has been a big push to optimize this further. Serialisation is slow across all browsers for Mono .Net. In the following component code, the todoItemsare displayed by the component. Find centralized, trusted content and collaborate around the technologies you use most. When the task completes, continue execution; that is, call UriHelper.NavigateTo('/Dashboard') synchronously. In Program.cs, configure the named HttpClient for Graph API: In the preceding example, the GraphAPIAuthorizationMessageHandler DelegatingHandler is registered as a transient service for AddHttpMessageHandler. LO Writer: Easiest way to put line of words into table as rows (list). 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. Transient registration is recommended for IHttpClientFactory, which manages its own DI scopes. I don't imagine there's any difference between using array and List, etc. However, scope of our WASM app is definitely expanding and we have users looking to handle 100s of thousands of of objects to perform data manipulation/analysis in browser like Excel would chomp through on a normal desktop. It indeed takes 7-12 seconds to return 17000 items (about 1.6 MB) of WeatherForecast. Await = stop here and wait for the task to finish and return the result (if any). 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 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. For more information, see the examples in Customize the user with a payload claim section. In blazor client side application, can read and data from json file async way. Here is a similar call in a Blazor page: I suggest running the perf test that @HenkHolterman suggested in stackoverflow to compare against the baseline. If you are using the net5.0 you should look at the System.Net.Http.Json extensions. 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. 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. Since then, the framework has grown and matured a lot. rev2022.11.3.43005. privacy statement. Blazor is a free and open-source web framework that enables developers to create web apps using C# and HTML. Does the 0m elevation height of a Digital Elevation Model (Copernicus DEM) correspond to mean sea level? If so, is the only solution to retrieve very small data sets everywhere on my site? mkArtakMSFT to in Blazor.Docs on Nov 1, 2019 guardrex, Backlog on Nov 9, 2019 pranavkm completed Blazor.Docs to guardrex guardrex mentioned this issue Call out the package requirement clearly #15687 Typical MS DOCs: GetJsonAsync #15843 Blazor call webAPI enhancements #15845 guardrex mentioned this issue on May 20, 2021 Code language: plaintext (plaintext) Here's an example of serializing an object into JSON with Newtonsoft and then sending it with HttpClient: Fastest decay of Fourier transform of function of (one-sided or two-sided) exponential decay. Follow these steps to read For more information, see the following resources: This section uses the Graph Authorization Message Handler (GraphAuthorizationMessageHandler.cs) and Program.cs additions to the app described earlier in this article, which provides a named HttpClient for Graph API. I didn't see much difference (Hardly 1 second) between STJ and MessagePack with HighPerformance power setting. 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 . We're finding ways to manage things, but it does seem like there ought to be a way to get 50,000 small objects deserialized in a second or two. @szalapski could you please try your timings with the a published app outside of VS? It took around 13 seconds to get 53,000 weather forecasts in v 3.1 but 7 seconds in 5.0.0-rc1. I hope still that it can start approaching the performance of .NET in a console app. ), 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. Blazor is a framework for building interactive client-side web UI with .NET. @szalapski OK thanks for clarifying on the download speed. Share server-side and client-side app logic written in .NET. However, there are a couple areas known to be slow that could be made faster in the serializer. Yes, Intel Core i5 8350-U with 16 GB RAM. Some considerations as to what might be slow: You can find our example Blazor project that has no UI but runs the wasm and reports to the console here: https://github.com/hypar-io/Elements/tree/wasm-perf/Elements.Wasm. You must be joking, ain't you ! Does a creature have to see to be affected by the Fear spell initially since it is an illusion? This is the type I want the response deserialized into. Nothing significant on the CPU, this is my only focus when I am doing this. Create rich interactive UIs using C# instead of JavaScript. I am having issues with other things being slow as well, and I suspect this issue not strictly related to deserialization. @rajeshaz09 I assume you've measured against 5.0 .NET since there have been gains. We have a similar performance degradation for serializing and deserializing JSON. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Running the same exact code on Blazor server produces the file in about a second. a Web API Core 3.0 Project, nothing fency, getting data at startup in the Index razor page is The common methods include: GetFromJsonAsync: Sends an HTTP GET request and parses the JSON response body to create an object. We can write both client-side and server-side code in C#.NET itself. :). Or advice how to route a page after data fetch got success. My results are much better: < 100ms download and < 4 seconds for deserialize. (as shown at the beginning of my request), it doesnt have the extension method for executing GetJsonAsync() The GetJsonAsync() method is an extension method for HttpClient, but it looks like what you are really trying to achieve here is one level of abstractiobn higher - i.e. In your Blazor app use this code to automatically deserialize: await Http.GetFromJsonAsync<ComponentDto>(.) I see this is being targeted for .NET7. The initial release target is to ship this as a standalone NuGet package at Build, alongside Blazor, which will utilise the APIs. 2022 Moderator Election Q&A Question Collection. See https://stackoverflow.com/q/63254162/. Blazor WASM has been great for the most part but this performance issue is making it really difficult to view Blazor as a viable option for some of the more data intensive projects I have coming up. While we do our best to look through all the issues filed here, to get a faster response we suggest posting your questions to StackOverflow using the asp.net-core-mvc tag. This is how this can work in the server-side Blazor: Add reference to Microsoft.AspNetCore.Blazor.HttpClient package. Create or load a JSON file under the wwwroot folder. 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. It would be fantastic for these development efforts if there was a way to run a dotnet benchmark across the core CLR and web assembly to make an apples->apples comparison. I see that MessagePack claims to be ~13x faster deserializing than Json.NET (no benchmark for STJ) for the case of "large array of simple objects". Is it OK to check indirectly in a Bash if statement for exit codes if they are multiple? What is the purpose of a display name in built-in form components? deserialization to an array of Customer s. RestClient.Net can do that in Blazor without the extra step. Here's the code before my performance refactoring. gRPC network usage is 70% smaller Anyway, extrapolating 332K to your 1MB is a 3x factor, so I assume it would take about 372ms * 3 = ~1.1 seconds to deserialize (on my fast desktop in isolation). If so, I already have the latest preview. Sunday, October 13, 2019 7:23 PM text/sourcefragment 10/16/2019 1:57:00 PM Anonymous 0 Select Blazor WebAssembly app and click on the Next button. Have a question about this project? 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.". Copyright 2001 - 2022 Syncfusion Inc. All Rights Reserved. I do hope that you're not the presenter in the video. But, unfortunately I can NOT use the GetJsonAsync() method here, as shown from the GitHub samples 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. This tells me there's no slowness in updating the DOM or rendering. In the following code, the GetData API is called on button click event. GetFromJsonAsyncis called when the component is finished initializing (OnInitializedAsync). This is where we populate a form with our Team entity, which includes name, shirt colour and location. Perhaps it is an issue with the way memory is accessed. How long to wait (TO BLOCK) a year or two ? 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. How to use Jackson to deserialise an array of objects, Best way to get consistent results when baking a purposely underbaked mud cake. The app must have the User.Read Graph API scope configured in AAD. I will try it on Blazor 5 preview 8 soon. In either case, since both Newtonsoft and STJ are slow there is likely something else going on. If so I think that should be next. Making statements based on opinion; back them up with references or personal experience. I will try it on Blazor 5 preview 8 soon. By clicking Sign up for GitHub, you agree to our terms of service and By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Consuming REST APIs. Call Graph API from a component using the Graph SDK. I duplicated that code in a small Blazor app. You signed in with another tab or window. Is WebAssembly really that slow at deserializing? 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. Use the HttpClient class with the GetFromJsonAsync() method to read a JSON file in Blazor WebAssembly. Which version of Blazor are you using? Either way, serialisation is painfully slow for what is really not that much data. It looks like this is a question about how to use ASP.NET Core. We have a 20 member team and everyone from developers to business experiences this slowness of deserialization so I can state from experience that it is not a system or environment issue. Let's create a description of a dynamic component: My controller in this example is returning an IEnumerable which is just a WeatherForecast[] (ordinary array) underneath. The benchmark containing the same code run on the desktop, shows the following for writing to gltf: It takes nearly 67x as long to run in web assembly. By clicking Sign up for GitHub, you agree to our terms of service and @SamMonoRT could we add it to interpreter benchmarks? Step 1 Step 2 In this step we will select " Blazor WebAssembly App " project type. The Blazor team has created a BrowserHttpMessageHandler and it handles interop between .NET and the JavaScript fetch API. Documentation is now available on docs.microsoft.com. 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. We can call methods in our library that do some pretty complicated geometry stuff and they run at near native speed. With large data sets: [wwwroot/employee.json] WebAssembly hosted App), I see next referenced dependencies: Which has (apparently) the extension method on the Http class for using GetJsonAsync() method from within the Client App. How do I validate a nested complex model in Blazor? You can avoid this exception by one of these solutions: Solution 1. Is any callback handler available for achieve my case? In the following example, the app creates a mobile phone number claim for the user from their AAD user profile's mobile phone number. Yes I am using .NET 5. So download time went from 1-6 seconds for 2-6MB to 20ms for 1.6MB -- any thought on why that's the case? How can I improve the efficiency of getting this large set of data (though it isn't all that big, I think!). In the following example, the app creates a mobile phone number claim for a user from their AAD user profile's mobile phone number. Email address is only for further clarification on your FAQ request. Therefore, much of the content of learn-blazor isn't necessary anymore and parts of it are outdated. If you have write-permissions please help me learn by adding exactly one area label. Both Newtonsoft and STJ are slow. builder.Services.AddSingleton<ProfileService> (); Now when the user accesses this in the browser they will get a single instance of this service until they refresh their browser. Can this slowness be fixed? This code works on both the server-side and client-side rendering and avoids the need to call GetJsonAsync. You should have not try to belittle me just in order to post this video. How to use Http.GetJsonAsync() in Blazor Server App? How to add custom validation in Blazor using custom validation attribute? It looks like there is an issue where the runtime is always initialized in debug mode when run from inside VS. Additionally if you update the app from 3.2 to 5.0 there are several interpreter optimizations and library improvements. Thanks, though. It's a pleasure to use. Not really a bug per say, but the new GetFromJsonAsync method is ~20% slower than the GetJsonAsync method in Blazor WASM in my (admittedly extremely primitive) perf testing.I was gonna write up a blog post on the perf improvements after 3.2 Preview 3 dropped, but was surprised to see the significant drop in perf. protected override async Task OnInitializedAsync() { image = await http.GetFromJsonAsync<Data.Image>("api/image"); } Wait, what is that http reference? Well occasionally send you account related emails. PostAsJsonAsync: Sends a POST request to the specified URI containing the value serialized as JSON in the request body. To learn more, see our tips on writing great answers. After searching for a while, I came through next site : https://learn-blazor.com/architecture/rest-api. 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. System.Net.Http.Json 's HttpClient extension methods such as GetFromJsonAsync () greatly simplifies the routine codes to retrieve json objects from a web API. The 1-6 seconds was over the internet, whereas the 20ms was running against a local web service. The text was updated successfully, but these errors were encountered: See also comments at https://stackoverflow.com/questions/63254162. I have tried like this below code, Error CS0029 - Cannot implicitly convert type System.Threading.Tasks.Task' to 'Application1.Models.DBModel'. But I can see significant gap if I use Balanced/PowerSaver setting. public async Task<List<YourDataModel>> GetMyDataAsync () { return await _httpClient.GetJsonAsync<List<YourDataModel>> (pathToYourJsonFileHere)} In your startup.cs file, modify the ConfigureServices method: //DI for HttpClient if (!services.Any (x => x.ServiceType == typeOf (HttpClient))) { services.AddSingleton<HttpClient> (); //DI for your service Why does Q1 turn on and Q2 turn off when I apply 5 V? 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. @tareqimbasher @szalapski 2MB json file is taking about 7 seconds to deserialize which is not acceptable. to your account. Both are fast with small payloads. implemented as next: And the service which hides the external API-call is implemented as next: So Im using the regular GetStringAsync() method on the created http client instance which returns When you 'll create a blazor project then you 'll have to choose blazor server app. Is there any certain types or techniques that could speed this up? @inject HttpClient Httpclient <button @onclick="@GetData">Get Data</button> @code { private async Task GetData . Now read what you wrote again: Microsoft Graph SDKs are designed to simplify building high-quality, efficient, and resilient applications that access Microsoft Graph. We have an .NET open source library that is used heavily in back end services run on AWS Lambda. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. protected override async Task OnInitAsync() { DBModel data = await Http.GetJsonAsync&lt;DBModel&gt;(&quot;sample-data/. 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. If you're using Visual Studio, you'll see it's nested "inside" the Blazor component. Create the following class and project configuration for working with Graph API. When I attempt the same set of code in an automated integration test, it only takes 3 seconds or so (the download time). The learn-blazor site had been created at a point in time when there was no Blazor documentation at all available. If the performance of Blazor is slow in a particular browser, that's more likely a wasm implementation issue for the team that maintain that browser as opposed to a Blazor/Mono .Net issue. @szalapski I can confirm without a doubt that the slowness is with the deserialization and not a system or environment issue. Await = stop here and wait for the task to finish and return the result (if any). First, and most importantly, thanks to the team working on Blazor and web assembly. 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? After that, provide a project name and click on the Next button. We can register this as a Singleton (if we're using Blazor Web Assembly, in program.cs). @pandiyaraj678, this is not my solution. (I think this should be virtually the same as running dotnet run, right?) Maybe it's my misunderstanding of how serialisation works - is it object construction in .Net itself being slow here and I shouldn't see any difference between AOT and interpreted builds? MessagePack is temporary solution, once we satisfy with .NET 6, we will move back to JSON. 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. For example, pass the User.Read scope to AddGraphClient for the examples in the following sections of this article: This section uses the utility classes (GraphClientExtensions.cs) described earlier in this article. That is a serious problem for me FYI: I am using .NET 6 Preview 3 and System.Text.Json, I have had a similar journey recently moving through different serialisers and finally arriving at Messagepack which has been good enough in interpreted WASM for current users. It's just serialization and reading/writing bytes that seem to be a big issue. How do I read a JSON file in Blazor WebAssembly? This is how it should be, though I would design my code much differently. Also @szalapski on download perf you originally said: but with your latest test from StackFlow you said: It indeed takes 7-12 seconds to return 17000 items (about 1.6 MB) of WeatherForecast. 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. Should we burninate the [variations] tag? deserialization to an array of Customers. We were excited with the possibility of running some of our code in our web application. Confirm correct package versions at NuGet.org. gRPC deserialization is 10 times faster, Check it out here: https://grpcblazorperf.azurewebsites.net. which can be found here: https://github.com/software-architects/learn-blazor/tree/master/samples/RestApi. 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. I created a Blazor Server App which gets its data from Note: Compare this with the one-liner httpClient.GetFromJsonAsync<Stock>(url); This outputs: Stock VTSAX (MutualFund) = 107.

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