Aspnetcore.docs: Could not find GetJsonAsync in HttpClient class

[sarathlalsaseendran]

Hi, I am using Blazor Server version which is shipped with ASP.NET Core 3.0. I could not find the "GetJsonAsync" method inside HttpClient class. Is there any work around?

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Document Details

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• ID: 8b5e2e10-ff7b-2b9f-84da-f16028ae2c53
• Version Independent ID: c7e59a08-1c60-32c2-75fd-33cb77ff7a5d
• Content: Call a web API from ASP.NET Core Blazor
• Content Source: aspnetcore/blazor/call-web-api.md
• Product: aspnet-core
• Technology: aspnetcore-blazor
• GitHub Login: @guardrex
• Microsoft Alias: riande

[guardrex]

Probably missing the package in your project file ...

<PackageReference Include="Microsoft.AspNetCore.Blazor.HttpClient" Version="3.0.0" />

[scottaddie]

@guardrex We should make that package requirement more visible in the doc. I also missed that detail when I was trying to do this.

[guardrex]

I'll go with a normal "Package" section like we often do.

[sarathlalsaseendran]

@guardrex I can get all other methods like GetAsync, PostAsync from same HttpClient. Only GetJsonAsync and PostJsonAsyc and other Json methods missing. Didn't you include in json serialization in Blazor server?

[sarathlalsaseendran]

I have created a CRUD blazor server app with manually convert to StringContent (using Newtonsoft) in PostAsync and also converted from HttpResponse to object using same Newtonsoft Deserializer.

[guardrex]

Sorry .... sorry ... you've caught me at the very end of the day. I'm brain-fried for the day ... been up since 5am! Yikes!.

These bits only work for Blazor WebAssembly. For Blazor Server, engineering says to use IHttpClientFactory, and I think those bits use System.Text.Json and there's a JsonSerializer. Check that doc ... I think it explains it all out.

[sarathlalsaseendran]

I have just checked "Microsoft.AspNetCore.Blazor.HttpClient" and found that this is still an experimental and preview only. Is that correct?

[guardrex]

Leave this issue open tho ...... I _do_ want to add a section for the package here. This issue will automatically close when the PR merges.

[guardrex]

Yes, that's correct. All of Blazor WebAssembly is in preview, including that package.

[scottaddie]

@sarathlalsaseendran You'll need to install the following package to gain access to methods like PostAsJsonAsync:

<PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="5.2.7" />

In 3.0, Json.NET (Newtonsoft) was removed from the shared framework. As a result, the Web API client package was removed too. It had a dependency on Json.NET. The default JSON serializer in 3.0 is System.Text.Json.

[guardrex]

Thanks @scottaddie ... we have the cross-link in this Blazor topic; but when I go to add the Package section, I'll double-check and work on the visibility of the text/link for Blazor server. Tomorrow tho! I'm 😵 at this point.

[sarathlalsaseendran]

Hi @scottaddie, Thanks for the suggestion. I have added the "Microsoft.AspNet.WebApi.Client" package as per your suggestion. But still not getting GetJsonAsync method in HttpCleint. I am getting "PostAsAsync" and "PutAsAsycn" methods. Can you please tell me is there any work around to get GetAsAsync method in HttpClient.

[pranavkm]

Did you mean ReadAsAsync? That should be on the response content.

[sarathlalsaseendran]

Hi @pranavkm, I am asking about "GetAsJsonAsync" method in HttpClient class. In previous versions of Blazor (prior to .NET Core 3.0) it was there. Now after I added "Microsoft.AspNet.WebApi.Client" package (as per @scottaddie ) I could see "PostAsAsync" and "PutAsAsync" methods. Do you have any update?

[pranavkm]

GetAsJsonAsync is an API specific to the experimental package. You can use HttpContent.ReadAsAsync<T> as a substitute: https://stackoverflow.com/a/24052147.