如何在 Blazor WebAssembly 中将 Json 结果转换为字符串? [英] How to covert Json result into string in Blazor WebAssembly?

问题描述

我想把结果转成字符串传递给导航路径，但是我做不到，请帮帮我.

I want to convert the result into a string and pass it to the navigation path, but I couldn't do it, please help me.

HttpGet 控制器

HttpGet Controller

[HttpGet]
[Route("UserId")]
public async Task<ActionResult<ApplicationUser>> GetUserId(string Username)
{
  var user = await userManager.FindByNameAsync(Username);
  if (user == null)
  return StatusCode(StatusCodes.Status500InternalServerError, new Response { Status = "Error", Message = "User not exist" });
  var result = await userManager.GetUserIdAsync(user);
  return new JsonResult(result);
}

控制器返回结果

85e39a3e-8101-4166-9193-5e41bec1a7ce"

"85e39a3e-8101-4166-9193-5e41bec1a7ce"

功能

private async Task Login()
    {
        var user = new userName { Username = Username };
        var loginUser = new LoginDb { Username = Username, Password = Password };
        if (Username == null || Password == null)
        {
            toastService.ShowWarning("Please enter Username and Password");
        }
        else
        {
            user = await Http.GetFromJsonAsync<userName>("Authentication/UserId?Username=" + Username);
            if (user != null)
            {
                string Id = System.Text.Json.JsonSerializer.Serialize(user);
                var result = await Http.PostAsJsonAsync("Authentication/login", loginUser);
                if (result.IsSuccessStatusCode)
                {
                    NavigationManager.NavigateTo("/profile/" + Id);
                    toastService.ShowSuccess("Login successful");
                }
                else
                {
                    toastService.ShowError("Username or Password is wrong");
                }
            }
            else
            {
                NavigationManager.NavigateTo("/login");
            }

        }
    }

推荐答案

好的，我可以看到一些问题.

OK, I can see a few problems.

在服务器上:

[HttpGet]
[Route("UserId")]
public async Task<ActionResult<ApplicationUser>> GetUserId(string Username)   // A
{
  var user = await userManager.FindByNameAsync(Username);
  if (user == null) // B
  return StatusCode(StatusCodes.Status500InternalServerError, new Response { Status = "Error", Message = "User not exist" });
  var result = await userManager.GetUserIdAsync(user);
  return new JsonResult(result);
}

首先，这里的返回类型是 Task> .ApplicationUser 与后端身份库相关联，您不能也不应该将其用于 DTO.

First, your return type here is Task<ActionResult<ApplicationUser>> . ApplicationUser is tied to the backend Identity library, you can't and shouldn't use it for a DTO.

你没有，最后你有 return new JsonResult(result); 当你将返回类型更改为 Task.

And you don't, in the end you have return new JsonResult(result); which is OK when you change the return type to just Task<ActionResult>.

在客户端:

//user = await Http.GetFromJsonAsync<userName>("Authentication/UserId?Username=" + Username);
  var userId = await Http.GetFromJsonAsync<string>("Authentication/UserId?Username=" + Username);

端点返回一个简单的字符串.Json 不知道用户名"或其他任何内容.

The endpoint returns a simple string. Json does not know about 'UserName' or anything else.

//string Id = System.Text.Json.JsonSerializer.Serialize(user); -- use UserId

您在此处(再次)序列化了 Id，几乎可以肯定它对于 URL 无效.所以就跳过那个.

You are serializing the Id (again) here, making it almost certainly invalid for an URL. So just skip that.

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