添加项目文件。

XXCpzs.MobileAppService/Controllers/ItemController.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using XXCpzs.Models;
+
+namespace XXCpzs.Controllers
+{
+    [Route("api/item")]
+    [ApiController]
+    public class ItemController : ControllerBase
+    {
+        private readonly IItemRepository ItemRepository;
+
+        public ItemController(IItemRepository itemRepository)
+        {
+            ItemRepository = itemRepository;
+        }
+
+        [HttpGet]
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        public ActionResult<IEnumerable<Item>> List()
+        {
+            return ItemRepository.GetAll().ToList();
+        }
+
+        [HttpGet("{id}")]
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        [ProducesResponseType(StatusCodes.Status404NotFound)]
+        public ActionResult<Item> GetItem(string id)
+        {
+            Item item = ItemRepository.Get(id);
+
+            if (item == null)
+                return NotFound();
+
+            return item;
+        }
+
+        [HttpPost]
+        [ProducesResponseType(StatusCodes.Status201Created)]
+        [ProducesResponseType(StatusCodes.Status400BadRequest)]
+        public ActionResult<Item> Create([FromBody]Item item)
+        {
+            ItemRepository.Add(item);
+            return CreatedAtAction(nameof(GetItem), new { item.Id }, item);
+        }
+
+        [HttpPut]
+        [ProducesResponseType(StatusCodes.Status204NoContent)]
+        [ProducesResponseType(StatusCodes.Status400BadRequest)]
+        public ActionResult Edit([FromBody] Item item)
+        {
+            try
+            {
+                ItemRepository.Update(item);
+            }
+            catch (Exception)
+            {
+                return BadRequest("Error while editing item");
+            }
+            return NoContent();
+        }
+
+        [HttpDelete("{id}")]
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        [ProducesResponseType(StatusCodes.Status404NotFound)]
+        public ActionResult Delete(string id)
+        {
+            Item item = ItemRepository.Remove(id);
+
+            if (item == null)
+                return NotFound();
+
+            return Ok();
+        }
+    }
+}

XXCpzs.MobileAppService/Models/IItemRepository.cs

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+using System;
+using System.Collections.Generic;
+
+namespace XXCpzs.Models
+{
+    public interface IItemRepository
+    {
+        void Add(Item item);
+        void Update(Item item);
+        Item Remove(string key);
+        Item Get(string id);
+        IEnumerable<Item> GetAll();
+    }
+}

XXCpzs.MobileAppService/Models/Item.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace XXCpzs.Models
+{
+    public class Item
+    {
+        public string Id { get; set; }
+
+        [Required]
+        public string Text { get; set; }
+
+        [Required]
+        public string Description { get; set; }
+    }
+}

XXCpzs.MobileAppService/Models/ItemRepository.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.Concurrent;
+
+namespace XXCpzs.Models
+{
+    public class ItemRepository : IItemRepository
+    {
+        private static ConcurrentDictionary<string, Item> items =
+            new ConcurrentDictionary<string, Item>();
+
+        public ItemRepository()
+        {
+            Add(new Item { Id = Guid.NewGuid().ToString(), Text = "Item 1", Description = "This is an item description." });
+            Add(new Item { Id = Guid.NewGuid().ToString(), Text = "Item 2", Description = "This is an item description." });
+            Add(new Item { Id = Guid.NewGuid().ToString(), Text = "Item 3", Description = "This is an item description." });
+        }
+
+        public IEnumerable<Item> GetAll()
+        {
+            return items.Values;
+        }
+
+        public void Add(Item item)
+        {
+            item.Id = Guid.NewGuid().ToString();
+            items[item.Id] = item;
+        }
+
+        public Item Get(string id)
+        {
+            items.TryGetValue(id, out Item item);
+            return item;
+        }
+
+        public Item Remove(string id)
+        {
+            items.TryRemove(id, out Item item);
+            return item;
+        }
+
+        public void Update(Item item)
+        {
+            items[item.Id] = item;
+        }
+    }
+}

XXCpzs.MobileAppService/Program.cs

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+using System;
+using System.Collections.Generic;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Hosting;
+
+namespace XXCpzs.MobileAppService
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateHostBuilder(args).Build().Run();
+        }
+
+        public static IHostBuilder CreateHostBuilder(string[] args) =>
+            Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(webBuilder =>
+                {
+                    webBuilder.UseStartup<Startup>();
+                });
+    }
+}

XXCpzs.MobileAppService/Properties/launchSettings.json

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+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:53100",
+      "sslPort": 44300
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "api/item",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "XXCpzs.MobileAppService": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "launchUrl": "api/item",
+      "applicationUrl": "https://localhost:5001;http://localhost:5000",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

XXCpzs.MobileAppService/Startup.cs

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+using System;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using XXCpzs.Models;
+
+namespace XXCpzs.MobileAppService
+{
+    public class Startup
+    {
+        public Startup(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        public IConfiguration Configuration { get; }
+
+        // This method gets called by the runtime. Use this method to add services to the container.
+        public void ConfigureServices(IServiceCollection services)
+        {
+            services.AddControllers();
+            services.AddSingleton<IItemRepository, ItemRepository>();
+        }
+
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+        {
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+
+            app.UseHttpsRedirection();
+            app.UseRouting();
+
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapControllers();
+            });
+        }
+    }
+}

XXCpzs.MobileAppService/XXCpzs.MobileAppService.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

XXCpzs.MobileAppService/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Debug",
+      "System": "Information",
+      "Microsoft": "Information"
+    }
+  }
+}

XXCpzs.MobileAppService/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    },
+    "Console": {
+      "LogLevel": {
+        "Default": "Warning"
+      }
+    }
+  },
+  "AllowedHosts": "*"
+}