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决定先开发Web端试试。
新增Web应用：
选择ASP.NET Core Web Application，填写好Name和Location，然后点击OK。
注意红框标出来的，基于.NET Core 2.1版本。登录认证用了微软自带的Identity。Template选择Web Application，也即最新的Razor Pages试图引擎模式。
创建完毕，因为该Template自带的bootstrap还是3.3.7，所以从，同时还需要下载的是popper js插件（如果用到dropdown组件的话，不大明白为何新版Bootstrap不自带这个）。_Layout中的css和js引用也需要同步更新一下，还有就是Navbar菜单需要更新，因为3.x和4.x用的class样式完全不一样。
下面给出示例代码：
1 <nav class="navbar navbar-expand-lg navbar-light bg-light fixed-top"> 2 <div class="container"> 3 <a asp-page="/Index" class="navbar-brand">PTager Shelves</a> 4 <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation"> 5 <span class="navbar-toggler-icon"></span> 6 </button> 7 8 <div class="collapse navbar-collapse" id="navbarSupportedContent"> 9 <ul class="navbar-nav mr-auto"> 10 <li class="nav-item active"> 11 <a class="nav-link" asp-page="/Index">Home</a> 12 </li> 13 <li class="nav-item"> 14 <a class="nav-link" asp-page="/About">About</a> 15 </li> 16 <li class="nav-item"> 17 <a class="nav-link" asp-page="/Contact">Contact</a> 18 </li> 19 </ul> 20 <partial name="_LoginPartial" /> 21 </div> 22 </div> 23 </nav>
到此，Web项目基本改造完成了。
当然，前面说到我还是用PTager的现有的登录DB做登录功能，很简单，直接修改appsettings.json文件中的DB连接字符串就好了（如果没有也没事，直接用本地的空DB，注册的时候会提示如何自己创建DB）。
我要评论 1 {
2 "ConnectionStrings": {
3 "DefaultConnection": "Server=.\\SQL2017;Database=PTager;Trusted_Connection=True;MultipleActiveResultSets=true"
4 },
5 "Logging": {
6 "LogLevel": {
7 "Default": "Warning"
8 }
9 },
10 "AllowedHosts": "*"
11 }
开始新增New Book功能。
先check豆瓣图书的api能不能正常调用。
在Pages文件夹下New Folder：Shelves，继续在Shelves文件夹New Item=>Razor Pages，Name直接改为：New。
为了接受豆瓣图书API获取的参数信息，先定义一个DoubanBookModel：
1 public class DoubanBookModel
2 {
3 public string title { get; set; }
4 public string subtitle { get; set; }
5 public IEnumerable<string> author { get; set; }
6 public IEnumerable<string> translator { get; set; }
7 public string isbn13 { get; set; }
8 public string isbn10 { get; set; }
9 public string author_intro { get; set; }
10 public string summary { get; set; }
11 public string publisher { get; set; }
12 public string binding { get; set; }
13 public string origin_title { get; set; }
14 public int pages { get; set; }
15 public string image { get; set; }
16 public string pubdate { get; set; }
17 public string catalog { get; set; }
18 public IEnumerable<TagItem> tags { get; set; }
19 public RatingItem rating { get; set; }
20
21
22 public sealed class TagItem
23 {
24 public int count { get; set; }
25 public string name { get; set; }
26 public string title { get; set; }
27 }
28 public sealed class SeriesItem
29 {
30 public int id { get; set; }
31 public string title { get; set; }
32 }
33 public sealed class RatingItem
34 {
35 public int max { get; set; }
36 public int min { get; set; }
37 public int numRaters { get; set; }
38 public string average { get; set; }
39 }
40 }
/Pages/Sheves/New.cshtml：
1 @page
2 @model NewModel
3 @{
4 ViewData["Title"] = "New Book";
5 }
6 <nav aria-label="breadcrumb">
7 <ol class="breadcrumb">
8 <li class="breadcrumb-item"><a asp-page="/Index">Home</a></li>
9 <li class="breadcrumb-item"><a asp-page="/My Books/Index">My Books</a></li>
10 <li class="breadcrumb-item active" aria-current="page">New Book</li>
11 </ol>
12 </nav>
13 <form method="get">
14 <div class="input-group input-group-lg mb-3">
15 <div class="input-group-prepend">
16 <span class="input-group-text" id="basic-addon1">ISBN #</span>
17 </div>
18 <input name="isbn" class="form-control" autofocus autocomplete="off" placeholder="ISBN #">
19 <div class="input-group-append">
20 <button class="btn btn-secondary btn-lg" type="submit">Search</button>
21 </div>
22 </div>
23 </form>
24 <hr />
25 @if (Model.DoubanBook != null)
26 {
27 var item = Model.DoubanBook;
28 <div class="media">
29 @*<img class="align-self-start mr-3" src="@item.image" alt="Generic placeholder image">*@
30 <div class="media-body">
31 <h3 class="mt-0">@item.title<small class="ml-3">@item.subtitle</small></h3>
32 <p><strong>Origin Title: </strong> @item.origin_title</p>
33 <p><strong>Author: </strong> @string.Join("、", item.author)</p>
34 <p><strong>Translator: </strong> @string.Join("、", item.translator)</p>
35 <p>
36 <strong>Pubdate: </strong> @item.pubdate
37 <strong class="ml-3">Publisher: </strong> @item.publisher
38 <strong class="ml-3">Binding: </strong> @item.binding
39 <strong class="ml-3">Pages: </strong> @item.pages
40 </p>
41 <p>
42 <strong>ISBN: </strong> @item.isbn13
43 </p>
44 <p><strong class="mr-3">Author Intro:</strong> @item.author_intro</p>
45 <p><strong class="mr-3">Summary:</strong>@item.summary</p>
46 @foreach (var tag in item.tags)
47 {
48 <span class="badge badge-info">@tag.name</span>
49 }
50 </div>
51 </div>
52 <hr />
53 <form method="post">
54 <input type="hidden" asp-page="IsbnNbr">
55 <button class="btn btn-warning" type="submit">Add To My Books</button>
56 </form>
57 }
/Pages/Sheves/New.cshtml.cs：
1 public class NewModel : PageModel
2 {
3 [BindProperty]
4 public string IsbnNbr { get; set; }
5 public DoubanBookModel DoubanBook { get; set; }
6
7 public async Task OnGetAsync(string isbn)
8 {
9 IsbnNbr = isbn?.Trim() ?? string.Empty;
10 if (validIsbnNbr(IsbnNbr))
11 {
12 DoubanBook = await getDoubanBook();
13 }
14 }
15 private async Task<DoubanBookModel> getDoubanBook()
16 {
17 var url = $"https://api.douban.com/v2/book/isbn/:{IsbnNbr}";
18 var result = await HttpGetAsync(url);
19 return JsonConvert.DeserializeObject<DoubanBookModel>(result);
20 }
21 public async Task<string> HttpGetAsync(string url, Encoding encoding = null)
22 {
23 using (var httpClient = new HttpClient())
24 {
25 return await httpClient.GetStringAsync(url);
26 }
27 }
28
29 private bool validIsbnNbr(string isbn)
30 => !string.IsNullOrEmpty(IsbnNbr) && (IsbnNbr.Length == 10 || IsbnNbr.Length == 13);
31 }
好了，现在可以直接从豆瓣图书API获取到返回结果了，并且能展示在页面：
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