快速入门:使用 C# 将查询发送到必应当地企业搜索 API

警告

2020 年 10 月 30 日,必应搜索 API 从 Azure AI 服务迁移到必应搜索服务。 本文档仅供参考。 有关更新的文档,请参阅必应搜索 API 文档。 关于为必应搜索创建新的 Azure 资源的说明,请参阅通过 Azure 市场创建必应搜索资源

使用此快速入门了解如何向必应当地企业搜索 API 发送请求,该 API 是一项 Azure 认知服务。 虽然这个简单的应用程序是用 C# 编写的,但 API 是一种 RESTful Web 服务,可以与任何能够发出 HTTP 请求并解析 JSON 的编程语言兼容。

此示例应用程序从 API 获取搜索查询的本地响应数据。

先决条件

创建请求

下面的代码创建 WebRequest、设置访问密钥标头,并添加针对“restaurant in Bellevue”的查询字符串。 然后发送请求,并将响应分配到包含 JSON 文本的字符串。

    // Replace the accessKey string value with your valid access key.
    const string accessKey = "enter key here";

    const string uriBase = "https://api.cognitive.microsoft.com/bing/v7.0/localbusinesses/search";   

    const string searchTerm = "restaurant in Bellevue";
    // Construct the URI of the search request
    var uriQuery = uriBase + "?q=" + Uri.EscapeDataString(searchQuery) + mkt=en-us;

    // Run the Web request and get response.
    WebRequest request = HttpWebRequest.Create(uriQuery);
    request.Headers["Ocp-Apim-Subscription-Key"] = accessKey; 

    HttpWebResponse response = (HttpWebResponse)request.GetResponseAsync().Result;
    string json = new StreamReader(response.GetResponseStream()).ReadToEnd();

运行完整应用程序

以下代码使用必应当地企业搜索 API 从必应搜索引擎返回本地化的搜索结果。 可按照以下步骤使用此代码:

  1. 在 Visual Studio 中(用社区版就足够)创建一个新的控制台解决方案。
  2. 将 Program.cs 替换为下面提供的代码。
  3. 使用对订阅有效的访问密钥替换 accessKey 值。
  4. 运行该程序。
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;

namespace localSearch
{
    class Program
    {
        // **********************************************
        // *** Update or verify the following values. ***
        // **********************************************

        // Replace the accessKey string value with your valid access key.
        const string accessKey = "enter key here";

        const string uriBase = "https://api.cognitive.microsoft.com/bing/v7.0/localbusinesses/search";   

        const string searchTerm = "restaurant in Bellevue";

        // Returns search results including relevant headers
        struct SearchResult
        {
            public String jsonResult;
            public Dictionary<String, String> relevantHeaders;
        }

        static void Main()
        {
            Console.OutputEncoding = System.Text.Encoding.UTF8;
            Console.WriteLine("Searching locally for: " + searchTerm);

            SearchResult result = BingLocalSearch(searchTerm, accessKey);

            Console.WriteLine("\nRelevant HTTP Headers:\n");
            foreach (var header in result.relevantHeaders)
                Console.WriteLine(header.Key + ": " + header.Value);

            Console.WriteLine("\nJSON Response:\n");
            Console.WriteLine(JsonPrettyPrint(result.jsonResult));

            Console.Write("\nPress Enter to exit ");
            Console.ReadLine();
        }

        /// <summary>
        /// Performs a Bing Local business search and return the results as a SearchResult.
        /// </summary>
        static SearchResult BingLocalSearch(string searchQuery, string key)
        {
            // Construct the URI of the search request
            var uriQuery = uriBase + "?q=" + Uri.EscapeDataString(searchQuery) + "&mkt=en-us";

            // Perform the Web request and get the response
            WebRequest request = HttpWebRequest.Create(uriQuery);
            request.Headers["Ocp-Apim-Subscription-Key"] = key; 

            HttpWebResponse response = (HttpWebResponse)request.GetResponseAsync().Result;
            string json = new StreamReader(response.GetResponseStream()).ReadToEnd();

            // Create result object for return
            var searchResult = new SearchResult();
            searchResult.jsonResult = json;
            searchResult.relevantHeaders = new Dictionary<String, String>();

            // Extract Bing HTTP headers
            foreach (String header in response.Headers)
            {
                if (header.StartsWith("BingAPIs-") || header.StartsWith("X-MSEdge-"))
                    searchResult.relevantHeaders[header] = response.Headers[header];
            }

            return searchResult;
        }

        /// <summary>
        /// Formats the given JSON string by adding line breaks and indents.
        /// </summary>
        /// <param name="json">The raw JSON string to format.</param>
        /// <returns>The formatted JSON string.</returns>
        static string JsonPrettyPrint(string json)
        {
            if (string.IsNullOrEmpty(json))
                return string.Empty;

            json = json.Replace(Environment.NewLine, "").Replace("\t", "");

            StringBuilder sb = new StringBuilder();
            bool quote = false;
            bool ignore = false;
            int offset = 0;
            int indentLength = 3;

            foreach (char ch in json)
            {
                switch (ch)
                {
                    case '"':
                        if (!ignore) quote = !quote;
                        break;
                    case '\'':
                        if (quote) ignore = !ignore;
                        break;
                }

                if (quote)
                    sb.Append(ch);
                else
                {
                    switch (ch)
                    {
                        case '{':
                        case '[':
                            sb.Append(ch);
                            sb.Append(Environment.NewLine);
                            sb.Append(new string(' ', ++offset * indentLength));
                            break;
                        case '}':
                        case ']':
                            sb.Append(Environment.NewLine);
                            sb.Append(new string(' ', --offset * indentLength));
                            sb.Append(ch);
                            break;
                        case ',':
                            sb.Append(ch);
                            sb.Append(Environment.NewLine);
                            sb.Append(new string(' ', offset * indentLength));
                            break;
                        case ':':
                            sb.Append(ch);
                            sb.Append(' ');
                            break;
                        default:
                            if (ch != ' ') sb.Append(ch);
                            break;
                    }
                }
            }

            return sb.ToString().Trim();
        }
    }
}

后续步骤