2021-04-19 1.配置说明截图，记录下来方便下次其他同事集成时候参考

JLChen

2021-04-19 b7fa25faef4decf509a998ae861f059896ea6093

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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
 
using Newtonsoft.Json;
using Plugin.Connectivity;
 
namespace ezxamairn
{
    public class CloudDataStore : IDataStore<Item>
    {
        HttpClient client;
        IEnumerable<Item> items;
 
        public CloudDataStore()
        {
            client = new HttpClient();
            client.BaseAddress = new Uri($"{App.BackendUrl}/");
 
            items = new List<Item>();
        }
 
        public async Task<IEnumerable<Item>> GetItemsAsync(bool forceRefresh = false)
        {
            if (forceRefresh && CrossConnectivity.Current.IsConnected)
            {
                var json = await client.GetStringAsync($"api/item");
                items = await Task.Run(() => JsonConvert.DeserializeObject<IEnumerable<Item>>(json));
            }
 
            return items;
        }
 
        public async Task<Item> GetItemAsync(string id)
        {
            if (id != null && CrossConnectivity.Current.IsConnected)
            {
                var json = await client.GetStringAsync($"api/item/{id}");
                return await Task.Run(() => JsonConvert.DeserializeObject<Item>(json));
            }
 
            return null;
        }
 
        public async Task<bool> AddItemAsync(Item item)
        {
            if (item == null || !CrossConnectivity.Current.IsConnected)
                return false;
 
            var serializedItem = JsonConvert.SerializeObject(item);
 
            var response = await client.PostAsync($"api/item", new StringContent(serializedItem, Encoding.UTF8, "application/json"));
 
            return response.IsSuccessStatusCode;
        }
 
        public async Task<bool> UpdateItemAsync(Item item)
        {
            if (item == null || item.Id == null || !CrossConnectivity.Current.IsConnected)
                return false;
 
            var serializedItem = JsonConvert.SerializeObject(item);
            var buffer = Encoding.UTF8.GetBytes(serializedItem);
            var byteContent = new ByteArrayContent(buffer);
 
            var response = await client.PutAsync(new Uri($"api/item/{item.Id}"), byteContent);
 
            return response.IsSuccessStatusCode;
        }
 
        public async Task<bool> DeleteItemAsync(string id)
        {
            if (string.IsNullOrEmpty(id) && !CrossConnectivity.Current.IsConnected)
                return false;
 
            var response = await client.DeleteAsync($"api/item/{id}");
 
            return response.IsSuccessStatusCode;
        }
    }
}