This is a Blazer server app, and im having trouble getting the values from the Controller using a ApiService, where I call the api service method from a @code section of the Index.razor page.
Index.razor
@code {
private List<SystemUser> systemUsers;
private List<RegisterUserModel> registerUserModels = new List<RegisterUserModel>();
private RegisterUserModel registerUserModel = null;
protected override async Task OnInitializedAsync()
{
try
{
systemUsers = await SystemUsersService.GetSystemUsers();
if (systemUsers != null && systemUsers.Count > 0)
{
foreach (SystemUser systemUser in systemUsers)
{
registerUserModel = new RegisterUserModel()
{
FirstName = systemUser.FirstName
,
LastName = systemUser.LastName
,
Email = systemUser.Email
,
UserName = systemUser.UserName
,
Password = systemUser.Password
};
registerUserModels.Add(registerUserModel);
}
}
}
catch (Exception exception)
{
Console.WriteLine("Error " exception);
}
}
}
ApiServiceClass
public class SystemUsersService
{
private readonly IHttpClientFactory _clientFactory;
public SystemUsersService(IHttpClientFactory clientFactory)
{
_clientFactory = clientFactory;
}
public async Task<List<SystemUser>> GetSystemUsers()
{
var result = new List<SystemUser>();
try
{
var url = string.Format("https://localhost:44391/systemusers/get");
var request = new HttpRequestMessage(HttpMethod.Get, url);
request.Headers.Add("Accept", "application/json");
var client = _clientFactory.CreateClient();
var response = await client.SendAsync(request);
if (response.IsSuccessStatusCode)
{
var stringResponse = await response.Content.ReadAsStringAsync();
result = JsonSerializer.Deserialize<List<SystemUser>>(stringResponse,
new JsonSerializerOptions() { PropertyNamingPolicy = JsonNamingPolicy.CamelCase });
}
else
{
result = Array.Empty<SystemUser>().ToList();
}
} catch (Exception exception)
{
throw exception;
}
return result;
}
}
}
Controller
namespace ServerWebAppForCW.Controllers
{
[ApiController]
[Route("[controller]")]
public class SystemUserController : ControllerBase
{
[HttpGet("/systemusers/get")]
public async Task<IEnumerable<SystemUser>> GetAll()
{
var model = new List<SystemUser>();
RegisterUserModel registerUserModel = new RegisterUserModel();
model = await registerUserModel.GetSystemUsers();
return model;
}
[HttpGet("/systemusers/create")]
public async Task<Boolean> CreateSystemUser(RegisterUserModel registerUserModel)
{
return await registerUserModel.CreateSystemUser();
}
}
}
From the below line of the Service class, the response i get over here is a weird html doc sort of thing in the content, though the status code is 200, when debugging the SendAsync does not call the controller method 'GetAll()'. So i dont know from where this call even gets the data.
var response = await client.SendAsync(request);
Here is the image
Moving on, an error get's thrown in he below line
result = JsonSerializer.Deserialize<List<SystemUser>>(stringResponse,
new JsonSerializerOptions() { PropertyNamingPolicy = JsonNamingPolicy.CamelCase });
Which kind of makes sense since JsonSerilizer is trying to deserialize a html response.
Exception error image
Error in text:
{"'<' is an invalid start of a value. Path: $ | LineNumber: 1 | BytePositionInLine: 0."}
So my question would be why am i getting this weird html response rather than the HttpClientFactory call not calling my controller's api?
Hope someone could explain this situation.
Fyi my start up injection
public void ConfigureServices(IServiceCollection services)
{
services.AddRazorPages();
services.AddServerSideBlazor();
services.AddSingleton<WeatherForecastService>();
services.AddScoped<SystemUserService>();
services.AddSingleton<SystemUsersService>();
services.AddDbContext<AppDBContext>(item => item.UseSqlServer(Configuration.GetConnectionString("myconn")));
services.AddHttpClient();
}
CodePudding user response：
services.AddRazorPages()
does not provide support for API.
To provide API routing, use any of the following:
services.AddMvc();
services.AddControllers();
services.AddControllersWithViews();
AddControllers is the most minimal implementation that will support API.
CodePudding user response：
I added this relevant code to my Startup.cs at the end of the ConfigureServices method
services.AddMvc(options => options.EnableEndpointRouting = false).SetCompatibilityVersion(CompatibilityVersion.Version_3_0);
ConfigureServices:
public void ConfigureServices(IServiceCollection services)
{
services.AddRazorPages();
services.AddServerSideBlazor();
services.AddSingleton<WeatherForecastService>();
services.AddScoped<SystemUserService>();
//This one AddMvc
services.AddMvc(options => options.EnableEndpointRouting = false).SetCompatibilityVersion(CompatibilityVersion.Version_3_0);
services.AddDbContext<AppDBContext>(item => item.UseSqlServer(Configuration.GetConnectionString("myconn")));
services.AddScoped<HttpClient>();
}
Also add this line to the Configure method of the Startup.cs class after the 'app.UseRouting();'.
app.UseMvcWithDefaultRoute();
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler("/Error");
// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseMvcWithDefaultRoute();
app.UseEndpoints(endpoints =>
{
endpoints.MapBlazorHub();
endpoints.MapFallbackToPage("/_Host");
});
}