创建并在.NET MAUIAPP

Question

我们在.NET MAUI应用程序中创建/使用

HttpClient

，就像我们在Web或API应用程序中相同的方式吗？具体来说，我将我的

HttpClient

添加到我的应用中

Program.cs

使用

IHttpFactory

-参见下文：

builder.Services.AddHttpClient("NamedClient1", config =>
{
    var url = currentState == "production"
        ? "https://my-production-url"
        : "https://sandbox-url";
    config.BaseAddress = new Uri(url);
});

我以.net Maui了解这个想法是为了标准化我们处理事物的方式。当我尝试在.NET MAUI应用中添加该行

builder.Services

时，Intellisense并不建议

AddHttpClient

。
    

Answer 1

builder.Services.AddScoped(sp => new HttpClient { });

移动开发中的HTTPCLEINT与Web有点不同。这些设备可以很好地处理HTTPCLIENT本身，我们不必担心通过使用Nuget软件包（Microsoft.extensions.http）正确处理它。因此，您可以改用AddSingleton，甚至可以使用HTTPClient的静态读取。 .NET MAUI团队确保以这种方式配置HTTPCLIENT类。
Microsoft的source：

Answer 2

.NET MAUI模板将HTTPCLIENT类映射到用于每个平台本机网络堆栈的代码。这使应用程序能够利用平台特定的网络配置和优化功能

我正在使用.NET 8并开发一个.Net Maui Blazor Hybrid应用程序，该应用与我的ASP.NETAPI

连接

我们的法案叔叔建议（并且效果很好）是创建API服务：

创建您的服务课：

Answer 3

public class APIService : IAPIService
 {
     HttpClient _httpClient;
     JsonSerializerOptions _jsonSerializerOptions;
     Uri _baseURI;
     public APIService()
     {
         _httpClient = new HttpClient();
         _jsonSerializerOptions = new JsonSerializerOptions
         {
             PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
             WriteIndented = true,
         };
         _baseURI = new Uri("https://localhost:7148");
     }

     public async Task<bool> POSTCredentialsAsync(LoginCommand command)
     {
         var response = await _httpClient.PostAsJsonAsync(_baseURI + "/login", command);
         if (response.IsSuccessStatusCode)
         {
             return true;
         }
         return false;
     }

     public async Task<bool> POSTRegistrationAsync(RegisterMarket command)
     {
         var response = await _httpClient.PostAsJsonAsync(_baseURI + "/register", command);
         if (response.IsSuccessStatusCode)
         {
             return true;
         }
         return false;
     }
 }

上面的

界面（对于页面中的依赖注入，Glazor Pages使用@Inject）：

  internal interface IAPIService
  {
      public Task<bool> POSTCredentialsAsync(LoginCommand command);
      public Task<bool> POSTRegistrationAsync(RegisterMarket command);
  }

lastly，在Mauiprogram.cs

中

builder.Services.AddScoped<IAPIService, APIService>();

在我的应用程序中真的很好

您可以处理另一个源文件中的响应 希望它有帮助 预先感谢

Microsoftoficial参考：

https：//learn.microsoft.com/en-us/dotnet/maui/data-cloud/rest/rest？view = net-maui-9.0

-temperature.xaml.cs

using System.Diagnostics.Metrics;
using System.Text.Json;
using System.Xml.Serialization;

namespace TPMaui3.Views;

public partial class vTemperature : ContentPage
{
    public vTemperature()
    {
        InitializeComponent();
    }

    private void AfficheTemperature(object sender, EventArgs e)
    {
        LireTemperature();
    }

    private async void LireTemperature()
    {
        Uri uri = new("http://meteorestsrvmobile.lab3il.fr/RestServiceMeteo.svc/xml/1");

        try
        {
            HttpClient client = new();
            HttpResponseMessage response = await client.GetAsync(uri);

            if (response.IsSuccessStatusCode)
            {
                String content = await response.Content.ReadAsStringAsync();
                content = content.Substring(content.IndexOf("<XMLDataResult>") + 15);
                content = content.Substring(0, content.IndexOf("</XMLDataResult>"));
                lbTemp.Text = content + " °C";
            }
        }
        catch (Exception ex)
        {
            await this.DisplayAlert("Error", ex.Message, "OK");
        }
    }
}

Vmeteo.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage 
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    x:Class="TPMaui3.Views.vMeteo"
    Title="Météo"
>
    <VerticalStackLayout Spacing="20" Margin="10" >
        <Label
            Text="Météo"
            x:Name="lbMeteo"
            VerticalOptions="Center"
            HorizontalOptions="Center" 
            FontSize="Medium" 
            TextColor="{StaticResource Primary}"
        />
        <Label
            Text="?"
            x:Name="lbTemperature"
            VerticalOptions="Center"
            HorizontalOptions="Center" 
            FontSize="Medium" 
            TextColor="{StaticResource Secondary}"
        />
        <Label
            Text="?"
            x:Name="lbPression"
            VerticalOptions="Center"
            HorizontalOptions="Center" 
            FontSize="Medium" 
            TextColor="{StaticResource Secondary}"
        />
        <Label
            Text="?"
            x:Name="lbHumidite"
            VerticalOptions="Center"
            HorizontalOptions="Center" 
            FontSize="Medium" 
            TextColor="{StaticResource Secondary}"
        />
        <Label
            Text="?"
            x:Name="lbPrecipitationJour"
            VerticalOptions="Center"
            HorizontalOptions="Center" 
            FontSize="Medium" 
            TextColor="{StaticResource Secondary}"
        />
        <Label
            Text="?"
            x:Name="lbTemperatureRessentie"
            VerticalOptions="Center"
            HorizontalOptions="Center" 
            FontSize="Medium" 
            TextColor="{StaticResource Secondary}"
        />
        <Label
            Text="?"
            x:Name="lbVentDirection"
            VerticalOptions="Center"
            HorizontalOptions="Center" 
            FontSize="Medium" 
            TextColor="{StaticResource Secondary}"
        />
        <Label
            Text="?"
            x:Name="lbVentVitesse"
            VerticalOptions="Center"
            HorizontalOptions="Center" 
            FontSize="Medium" 
            TextColor="{StaticResource Secondary}"
        />
    </VerticalStackLayout>
</ContentPage>

Answer 4

using System.Diagnostics.Metrics;
using System.Text.Json;
using TPMaui3.Models;

namespace TPMaui3.Views;

public partial class vMeteo : ContentPage
{
    public vMeteo()
    {
        InitializeComponent();
        Meteo();
    }

    private async void Meteo()
    {
        Uri uri = new("http://meteorestsrvmobile.lab3il.fr/RestServiceMeteo.svc/jsontmps");
        try
        {
            HttpClient client = new();
            HttpResponseMessage response = await client.GetAsync(uri);
            JsonSerializerOptions jsonSerializerOptions = new JsonSerializerOptions();

            if (response.IsSuccessStatusCode)
            {
                var result = await response.Content.ReadAsStringAsync();
                result = result.Replace("{\"JSONDataTmpsResult\":", "");
                result = result.Replace("}}", "}");

                var vMeteo = Newtonsoft.Json.JsonConvert.DeserializeObject<CMeteo>(result);
                lbMeteo.Text = "Relevé à " + vMeteo.DateReleve.ToString();
                lbTemperature.Text = "Temp: " + vMeteo.Temperature.ToString() + " °C";
                lbHumidite.Text = "Hum: " + vMeteo.Humidite.ToString() + " %";
                lbPression.Text = "Pres: " + vMeteo.Pression.ToString() + " hPa";
                lbTemperatureRessentie.Text = "TR: " + vMeteo.TemperatureRessentie.ToString() + " °C";
                lbPrecipitationJour.Text = "PrecJ: " + vMeteo.PrecipitationJour.ToString() + " mm";
                lbVentVitesse.Text = "Vit: " + vMeteo.VentVitesse.ToString() + " m/s";
                lbVentDirection.Text = "Vent: " + vMeteo.VentDirection.ToString();
            }
        }
        catch (Exception ex)
        {
            await this.DisplayAlert("Error", ex.Message, "OK");
        }
    }
}

Cmeteo.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;
using TPMaui3.Views;

namespace TPMaui3.Models;

internal class CMeteo
{
    public CMeteo()
    {
    }

    public string DateReleve { get; set; }
    public string Temperature { get; set; }
    public string Pression { get; set; }
    public string Humidite { get; set; }
    public string PrecipitationJour { get; set; }
    public string TemperatureRessentie { get; set; }
    public string VentDirection { get; set; }
    public string VentVitesse { get; set; }
}