[教程][Blogger][C#] Blogger API v3 教程#7——获取帖子列表

【这个系列中..】

[教程][Blogger][C#] Blogger API v3教程#1 —— 前言

[教程][Blogger][C#] Blogger API v3 教程#2 —— 申请 Blogger API 的使用权限

[教程][Blogger][C#] Blogger API v3 教程#3 —— 获取API Key、Client ID 和 Client Secret

[教程][Blogger][C#] Blogger API v3 教程#4 —— 设置开发环境、安装插件、添加Reference

[教程][Blogger][C#] Blogger API v3 教程#5 —— 获取Blog Id

[教程][Blogger][C#] Blogger API v3 教程#6——OAuth 2.0 认证

[教程][Blogger][C#] Blogger API v3 教程#7——获取帖子列表

[教程][Blogger][C#] Blogger API v3 教程#8——更改帖子标题

【获取帖子列表】

有BlogID 了万事好办..

Blogger API的数据模型是这样的：

Blogs Resource 下有Posts Resource

所以我们创建一个PostsResource变量，传入blogService

PostsResource postsRes = new PostsResource(blogService);

有一API 叫做 posts.list

如上面的GetByUrl Request 一般，PostsResource 也有ListRequest

呼叫PostsResouce 里面的 .List函数，返回一个PostsResource.ListRequest

然后呼叫PostsResource.ListRequest 的.Execute()函数，返回一个PostList 类型

PostsResource postsRes = new PostsResource(blogService);
PostsResource.ListRequest postsListReq = postsRes.List(blog.Id);
PostList posts = postsListReq.Execute();

Blogger API 默认返回10个posts，储存在Post.Items中

现在在遍历.Items 然后输出post的 Title

for (int i = 0; i < posts.Items.Count; i++)
{
    Console.WriteLine(posts.Items[i].Title);
}

完整代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Google.Apis.Blogger.v3;
using Google.Apis.Blogger.v3.Data;
using Google.Apis.Services;
using System.Diagnostics;
using Google.Apis.Authentication.OAuth2;
using Google.Apis.Authentication.OAuth2.DotNetOpenAuth;
using DotNetOpenAuth.OAuth2;
using Google.Apis.Util;


namespace BloggerTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string apiKey= "{API-KEY}";
            string blogUrl= "{BLOG-URL}";

            string clientID = "{CLIENT_ID}";
            string clientSec = "{CLIENT_SECRET}";

            NativeApplicationClient provider = new NativeApplicationClient(GoogleAuthenticationServer.Description)
            {
                ClientIdentifier = clientID,
                ClientSecret = clientSec
            };

            OAuth2Authenticator<NativeApplicationClient> auth = new OAuth2Authenticator<NativeApplicationClient>(provider, getAuth);

            BloggerService blogService = new BloggerService(new BaseClientService.Initializer()
            {
                Authenticator = auth,
                ApplicationName = "BloggerTest"
            });


            BlogsResource.GetByUrlRequest getReq = blogService.Blogs.GetByUrl(blogUrl);
            getReq.Key = apiKey;
            Blog blog = getReq.Execute();

            Console.WriteLine("Blog ID: " + blog.Id);
            Console.WriteLine();

            PostsResource postRes = new PostsResource(blogService);
            PostsResource.ListRequest postsListReq = postRes.List(blog.Id);
            PostList posts = postsListReq.Execute();

            for (int i = 0; i < posts.Items.Count; i++)
            {
                Console.WriteLine(posts.Items[i].Title);
            }

            Console.WriteLine();
            Console.WriteLine("Done...");

            Console.ReadKey();



        }

        private static IAuthorizationState getAuth(NativeApplicationClient arg)
        {
            IAuthorizationState state = new AuthorizationState(new[] { BloggerService.Scopes.Blogger.GetStringValue() })
                {
                    Callback = new Uri(NativeApplicationClient.OutOfBandCallbackUrl)
                };
            Uri authUri = arg.RequestUserAuthorization(state);
            Process.Start(authUri.ToString());
            Console.WriteLine("Please enter auth code:");
            string authCode = Console.ReadLine();
            return arg.ProcessUserAuthorization(authCode, state);
        }


    }
}

输出结果：

【获取所有帖子】

PostList 里面有个.PageToken和.NextPageToken、.PrevPageToken

基本上，含义是这样：





所以我们要遍历所有的帖子的话，

要把.PageToken 设置为 NextPageToken

然后还要检测当前的PageToken是否为第一个的PageToken （因为我们已经获取过了，所以不用获取了），如果是的话，就break 出 while loop

所以把之前代码中的

PostList posts = postsListReq.Execute();

删除掉

现在定义一个string为 firstToken

用来储存第一个NextPageToken

string firstToken = "";

现在就是while loop

现在就是while loop

while (true)
{
    PostList posts = postsListReq.Execute();
    postsListReq.PageToken = posts.NextPageToken;

    if (firstToken == "")
    {
        firstToken = posts.NextPageToken;
    }
    else if (firstToken != "" && posts.NextPageToken == firstToken)
    {
        // repeated
        break;
    }

    for (int i = 0; i < posts.Items.Count; i++)
    {
        Console.WriteLine("Title: " + posts.Items[i].Title);
        Console.WriteLine("URL: " + posts.Items[i].Url);
    }

}

}



完整代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Google.Apis.Blogger.v3;
using Google.Apis.Blogger.v3.Data;
using Google.Apis.Services;
using System.Diagnostics;
using Google.Apis.Authentication.OAuth2;
using Google.Apis.Authentication.OAuth2.DotNetOpenAuth;
using DotNetOpenAuth.OAuth2;
using Google.Apis.Util;


namespace BloggerTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string apiKey= "{API-KEY}"
            string blogUrl= "{BLOG-URL}"

            string clientID = "{CLIENT_ID}";
            string clientSec = "{CLIENT_SECRET}";
            
            NativeApplicationClient provider = new NativeApplicationClient(GoogleAuthenticationServer.Description)
            {
                ClientIdentifier = clientID,
                ClientSecret = clientSec
            };

            OAuth2Authenticator<NativeApplicationClient> auth = new OAuth2Authenticator<NativeApplicationClient>(provider, getAuth);

            BloggerService blogService = new BloggerService(new BaseClientService.Initializer()
            {
                Authenticator = auth,
                ApplicationName = "BloggerTest"
            });


            BlogsResource.GetByUrlRequest getReq = blogService.Blogs.GetByUrl(blogUrl);
            getReq.Key = apiKey;
            Blog blog = getReq.Execute();

            Console.WriteLine("Blog ID: " + blog.Id);
            Console.WriteLine();

            PostsResource postRes = new PostsResource(blogService);
            PostsResource.ListRequest postsListReq = postRes.List(blog.Id);

            string firstToken = "";

            while (true)
            {
                PostList posts = postsListReq.Execute();
                postsListReq.PageToken = posts.NextPageToken;

                if (firstToken == "")
                {
                    firstToken = posts.NextPageToken;
                }
                else if (firstToken != "" && posts.NextPageToken == firstToken)
                {
                    // repeated
                    break;
                }

                for (int i = 0; i < posts.Items.Count; i++)
                {
                    Console.WriteLine("Title: " + posts.Items[i].Title);
                    Console.WriteLine("URL: " + posts.Items[i].Url);
                }

            }

            Console.WriteLine();
            Console.WriteLine("Done...");

            Console.ReadKey();



        }

        private static IAuthorizationState getAuth(NativeApplicationClient arg)
        {
            IAuthorizationState state = new AuthorizationState(new[] { BloggerService.Scopes.Blogger.GetStringValue() })
                {
                    Callback = new Uri(NativeApplicationClient.OutOfBandCallbackUrl)
                };
            Uri authUri = arg.RequestUserAuthorization(state);
            Process.Start(authUri.ToString());
            Console.WriteLine("Please enter auth code:");
            string authCode = Console.ReadLine();
            return arg.ProcessUserAuthorization(authCode, state);
        }


    }
}

输出结果：