Similar patterns exist for OIDC and API authentication. @szalapski OK thanks for clarifying on the download speed. Follow these steps to read 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. 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. There are two hosting models available for Blazor. In this crash course, we build an actual Blazor WebAssembly application based on .NET 5. I am having issues with other things being slow as well, and I suspect this issue not strictly related to deserialization. How do I enable validation without using the DataAnnotationValidator? 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 Program.cs, configure the named HttpClient for Graph API: In the preceding example, the GraphAPIAuthorizationMessageHandler DelegatingHandler is registered as a transient service for AddHttpMessageHandler. 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. The StackOverflow test runs <4 seconds for @HenkHolterman and 7-12 seconds for @szalapski. 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. So we can not realize our application with Blazor. Thanks guys, sharing your valuable suggestion. No, no ,no: await means yield execution to the calling code ( don't block) while the task is in progress. Does a creature have to see to be affected by the Fear spell initially since it is an illusion? Step 3 Step 4 Here we will select Framework type as .NET 6.0 and also select the ASP.NET Core hosted option. For more information, see the examples in Customize the user with a payload claim section. Await = stop here and wait for the task to finish and return the result (if any). It's just serialization and reading/writing bytes that seem to be a big issue. Here's the code before my performance refactoring. I have powerful dev machine. 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). But in Firefox the same deserialization took ~35 seconds! You'll see some build errors and will need to resolve some dependencies. How to help a successful high schooler who is failing in college? Now open Visual Studio 2022 and follow the below steps. In chrome the deserialization took took ~4 seconds (that's actually "good enough" for me, at least right now) Running it from Visual Studio, "run without debugging" in Release configuration. 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 Additional scopes can be added. Job DescriptionRole - Technology LeadTechnology -.Net, Blazor WebAssemblyLocation - StockholmSee this and similar jobs on LinkedIn. Email address is only for further clarification on your FAQ request. See https://stackoverflow.com/q/63254162/. This is how this can work in the server-side Blazor: Add reference to Microsoft.AspNetCore.Blazor.HttpClient package. You are saying that I have a problem that is not inherent to deserializing in WebAssembly? Create or load a JSON file under the wwwroot folder. 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. This will create the database and seed the required data. Just tried outside of VS -- using dotnet run at the command line in Windows. You can learn more about the improvements #40318. Customize user claims with the Graph SDK. I didn't see much difference (Hardly 1 second) between STJ and MessagePack with HighPerformance power setting. This may be the root of the problem. Documentation is now available on docs.microsoft.com. In blazor client side application, can read and data from json file async way. Connect and share knowledge within a single location that is structured and easy to search. 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. Blazor is a framework built by Microsoft for creating interactive client-side web UI with .NET codebase. (I think this should be virtually the same as running dotnet run, right?) 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. We were excited with the possibility of running some of our code in our web application. My controller in this example is returning an IEnumerable which is just a WeatherForecast[] (ordinary array) underneath. The 1-6 seconds was over the internet, whereas the 20ms was running against a local web service. You signed in with another tab or window. To resolve these: Make the new file a partial class. Foo is actually as follows, with minimal name changes only to protect the proprietary. Why so many wires in my old light fixture? I hope still that it can start approaching the performance of .NET in a console app. (as shown at the beginning of my request), it doesnt have the extension method for executing GetJsonAsync() By clicking Sign up for GitHub, you agree to our terms of service and If the app requires a custom user account class that extends RemoteUserAccount, swap the custom user account class for RemoteUserAccount in the following code. How can this be achieved then on a Blazor Server based app ? Transformer 220/380/440 V 24 V explanation. Hopefully you will see a large improvement on Blazor 5. privacy statement. For example, here we have created a simple employee.json file and read its values in a Razor component. The examples in this section require a package reference for Microsoft.Extensions.Http for the standalone or Client app. @inject HttpClient Httpclient <button @onclick="@GetData">Get Data</button> @code { private async Task GetData . I created a Blazor Server App which gets its data from @szalapski could you please try your timings with the a published app outside of VS? It will not be used for any other purpose. Why don't we consider drain-bulk voltage instead of source-bulk voltage in body effect? Transient registration is recommended for IHttpClientFactory, which manages its own DI scopes. This doesn't seem right to me. Wait, I thought all agreed that the slowness is in the deserialization code, not in a problem with my system or environment. PostAsJsonAsync: Sends a POST request to the specified URI containing the value serialized as JSON in the request body. MessagePack is temporary solution, once we satisfy with .NET 6, we will move back to JSON. @enetstudio : Actually i am using client side blazor application, your solution not work with my scenario. This is where we populate a form with our Team entity, which includes name, shirt colour and location. Hi. Since then, the framework has grown and matured a lot. As you can see from the code, I've passed a type parameter to the GetJsonAsync method. 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 . Page restricted and some time after only data assigned specified parameter, Finally, i solve this issue by following way in my project. Time to create a Razor component in our Blazor Wasm application. This also includes a "polymorphic" mode due to using System.Object that causes deserialization to be much slower (almost 2x) than without it. Create the following class and project configuration for working with Graph API. But i want to do it in synchronous approach, because i need to do route the page after data fetch completed. I recommend setting a reasonable goal for the next release. 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. Why shouldn't it be on the order of tens of milliseconds? I've found Utf8Json to be much faster than both Newtonsoft and System.Text.Json. 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. (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. How to use Http.GetJsonAsync() in Blazor Server App? The GetFromJsonAsync () extension method of the HttpClient is called to send a request and convert the response into a UsersResponse object which is assigned to the blazor component property response so it can be rendered by the component template Any new news or suggestions (@szalapski )? The examples in this section require package references for the standalone or Client app: For guidance on adding packages to .NET apps, see the articles under Install and manage packages at Package consumption workflow (NuGet documentation). First, and most importantly, thanks to the team working on Blazor and web assembly. As Im currently evaluating Blazor (Server) I made a simple POC application PutAsJsonAsync: Sends an HTTP PUT request, including JSON-encoded content. In blazor client side application, can read and data from json file async way. rev2022.11.3.43005. Now read what you wrote again: 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. @tareqimbasher @szalapski 2MB json file is taking about 7 seconds to deserialize which is not acceptable. Home / FAQ / Blazor / Web API / How do I read a JSON file in Blazor WebAssembly? The client deserializes that using HttpClient.GetFromJsonAsync(string). To do this, we'll create an Index.razor.cs file. Thanks for contacting us. 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. But I can see significant gap if I use Balanced/PowerSaver setting. Or advice how to route a page after data fetch got success. Well occasionally send you account related emails. 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. 2022 Moderator Election Q&A Question Collection. By clicking Sign up for GitHub, you agree to our terms of service and 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. 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 The common methods include: GetFromJsonAsync: Sends an HTTP GET request and parses the JSON response body to create an object. Our initial benchmarks of rc1 are showing it to be slower in this area than interpreted mode. deserialization to an array of Customer s. RestClient.Net can do that in Blazor without the extra step. Provide the required scopes to the Scopes . Blazor in net5 should be considerably faster. @tareqimbasher are you running on Blazor 5? RestClient.Net can do that in Blazor without the extra step. This is how it should be, though I would design my code much differently. I assume no attempt to run on Blazor 5.0 yet? What exactly makes a black hole STAY a black hole? Or are you suggesting I move the app to Blazor 5.0.0 latest preview? That model is simple and should be fast (no System.Object, non-generic collections or custom converters that could slow it down). Can this slowness be fixed? @lewing Do you mean just System.Text.Json should be faster? https://github.com/hypar-io/Elements/tree/wasm-perf/Elements.Benchmarks. I see this is being targeted for .NET7. Already on GitHub? How long to wait (TO BLOCK) a year or two ? GetFromJsonAsyncis called when the component is finished initializing (OnInitializedAsync). Blazor Server for production was already available. Both Newtonsoft and STJ are slow. For now we've had to build our own. For example, when I try to create an Excel file using EPPlus, ClosedXML, or similar APIs (I tried a bunch), it takes well over a minute for a 2MB file. 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. I'm already avoiding non-generic lists and objects that are of type System.Object. You can avoid this exception by one of these solutions: Solution 1. Not the answer you're looking for? 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. Posted 9:05:43 PM. 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. which can be found here: https://github.com/software-architects/learn-blazor/tree/master/samples/RestApi. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. How do I read a JSON file in Blazor WebAssembly? In VS2019 (Version 16.3.8) for ordering pizzas. What is the deepest Stockfish evaluation of the standard initial position that has ever been done? The performance is so poor that I am still skeptical that this is just a slow area--I still suspect that something is wrong with the way I am doing it. 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. Is this just slow deserialization in ReadFromJsonAsync (which calls System.Text.Json.JsonSerializer.Deserialize internally), or is there something else going on here? We have an .NET open source library that is used heavily in back end services run on AWS Lambda. 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. Have a question about this project? The app must have the User.Read Graph API scope configured in AAD. 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. 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. Cut and paste everything inside the @code block to the new file. 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 Yes, Intel Core i5 8350-U with 16 GB RAM. The following GraphExample component uses an injected GraphServiceClient to obtain the user's AAD profile data and display their mobile phone number: This section uses the utility classes (GraphClientExtensions.cs) described earlier in this article. Making statements based on opinion; back them up with references or personal experience. Why can we add/substract/cross out chemical equations for Hess law? Describe the bug. It is expected to be included as part of the BCL in an upcoming .NET 5 preview. The GetFromJsonAsync method is used to get the parsed Json data. In either case, since both Newtonsoft and STJ are slow there is likely something else going on. 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. @steveharter , I tried it just as suggested. I'll add my support for @szalapski here. Is it OK to check indirectly in a Bash if statement for exit codes if they are multiple? Step 1 Step 2 In this step we will select " Blazor WebAssembly App " project type. Would a deserialization of a few megabytes take 10-30 s? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy.
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