Question

我正在Blazor中构建一个基本的CRUD应用程序，并在添加事件记录（在AddEvent.razor中）后将用户重定向到事件列表。发布请求成功通过，但执行没有返回，也没有点击我的array_columns来重定向到“事件列表”页面。

我的Blazor解决方案在以下位置使用WebAssembly托管：

客户端项目（.NET Standard 2.1）
使用EntityFrameworkCore 3.1.8和Microsoft.AspNetCore 3.2.1的Server Project REST API（dotnet核心3.1）
共享项目（.NET Standard 2.1）

这是我在Program.cs中配置HttpClient的方式：

array_multisort

我有一个AddEvent.razor页面，其中通过NavigateTo方法添加了事件实体：

builder.Services.AddSingleton( new HttpClient
{
   BaseAddress = new Uri( builder.HostEnvironment.BaseAddress )
});

这是CreateEvent定义P

CreateEvent

我的<div class="form-group"> <button class="btn btn-primary" @onclick="@CreateEvent">Save</button> <button class="btn btn-warning" @onclick="@cancel">Cancel</button> </div>类具有以下Post方法：

private async Task CreateEvent()
{
    try
    {
        //While debugging seems like UI thread is lost after this line, it doesn't reach the Navigation statement below
        var response = await Http.PostAsJsonAsync("/api/Event/create", evt);
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
    }

    await Task.Delay(500);
    Navigation.NavigateTo("/fetchevent");
}

我的主要问题是在AddEvent.razor CreateEvent方法中，似乎在此行之后失去执行：

EventController

它从未命中以下导航线：

// POST api/<controller> [HttpPost("create")] public ActionResult Post([FromBody]Event evt) { if (ModelState.IsValid){ _eventRepository.AddEvent(evt); return Ok(); } return BadRequest(); }

我尝试更改EventController Post的签名，并将var response = await Http.PostAsJsonAsync("/api/Event/create", evt);调用包装在try / catch中，但它从未命中异常块。我还尝试在发布后添加延迟，但没有运气...

这是我单击AddEvent按钮时在日志中看到的内容：

Navigation.NavigateTo("/fetchevent");

关于Http.PostAsJsonAsync调用为何不返回并继续执行我的Microsoft.AspNetCore.Hosting.Diagnostics: Information: Request starting HTTP/1.1 POST http://localhost:54114/api/Event/create application/json; charset=utf-8 105 Microsoft.AspNetCore.Routing.EndpointMiddleware: Information: Executing endpoint 'Paycor.PartnerManager.Server.Controllers.EventController.Post (Paycor.PartnerManager.Server)' Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker: Information: Route matched with {action = "Post", controller = "Event"}. Executing controller action with signature Microsoft.AspNetCore.Mvc.ActionResult Post(Paycor.PartnerManager.Shared.Models.Event) on controller Paycor.PartnerManager.Server.Controllers.EventController (Paycor.PartnerManager.Server). Microsoft.AspNetCore.Hosting.Diagnostics: Information: Request starting HTTP/1.1 GET http://localhost:54114/addevent? Microsoft.AspNetCore.Routing.EndpointMiddleware: Information: Executing endpoint 'Fallback {*path:nonfile}' Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware: Information: Sending file. Request path: '/index.html'. Physical path: 'C:\Development\GitRepos\Prototypes\Paycor.PartnerManager\PartnerManager\Client\wwwroot\index.html' Microsoft.AspNetCore.Routing.EndpointMiddleware: Information: Executed endpoint 'Fallback {*path:nonfile}' Microsoft.AspNetCore.Hosting.Diagnostics: Information: Request finished in 9.8383ms 200 text/html Debugging hotkey: Shift+Alt+D (when application has focus) Microsoft.AspNetCore.Hosting.Diagnostics: Information: Request starting HTTP/1.1 GET http://localhost:54114/_framework/blazor.boot.json Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware: Information: The file /_framework/blazor.boot.json was not modified Microsoft.AspNetCore.Hosting.Diagnostics: Information: Request finished in 27.6226ms 304 application/json Microsoft.AspNetCore.Mvc.StatusCodeResult: Information: Executing HttpStatusCodeResult, setting HTTP status code 200 Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker: Information: Executed action Paycor.PartnerManager.Server.Controllers.EventController.Post (Paycor.PartnerManager.Server) in 556.5854ms Microsoft.AspNetCore.Routing.EndpointMiddleware: Information: Executed endpoint 'Paycor.PartnerManager.Server.Controllers.EventController.Post (Paycor.PartnerManager.Server)' Microsoft.AspNetCore.Hosting.Diagnostics: Information: Request finished in 592.7471ms 0方法中其余语句的任何想法？

在Blazor中发送POST请求后丢失UI线程

0 个答案: