Quickstart: Suggest search queries with the Bing Autosuggest REST API and C#

Follow this quickstart to learn how to make calls to the Bing Autosuggest API and read the JSON response. This simple C# application sends a partial search query to the API, and returns suggestions for searches. While this application is written in C#, the API is a RESTful Web service compatible with most programming languages. The source code for this sample is available on GitHub.

Prerequisites

Create an Azure resource

Start using the Bing Autosuggest API by creating one of the following Azure resources.

Bing Autosuggest resource

  • Available through the Azure portal until you delete the resource.
  • Use the free pricing tier to try the service, and upgrade later to a paid tier for production.
  • Bing Autosuggest is also offered in paid tiers of the Bing Search v7 resource.

Multi-service resource

  • Available through the Azure portal until you delete the resource.
  • Use the same key and endpoint for your applications, across multiple Cognitive Services.

Create a Visual Search Solution

  1. Create a new console solution in Visual Studio. Then, add the following namespaces into the main code file.

    using System;
    using System.Collections.Generic;
    using System.Net.Http;
    using System.Net.Http.Headers;
    using System.Text;
    
  2. In a new class, create variables for your API host and path, market code, and a partial search query. Use the global endpoint in the following code, or use the custom subdomain endpoint displayed in the Azure portal for your resource.

    static string host = "https://api.cognitive.microsoft.com";
    static string path = "/bing/v7.0/Suggestions";
    static string market = "en-US";
    static string key = "your-api-key";
    
    static string query = "sail";
    

Create and send an API request

  1. Create a function called Autosuggest() to send a request to the API. Create a new HttpClient(), and add your subscription key to the Ocp-Apim-Subscription-Key header.

    async static void Autosuggest()
    {
        HttpClient client = new HttpClient();
        client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", key);
        //..
    }
    
  2. In the same function above, create a request URI by combining your API host and path. Append your market to the mkt= parameter, and your query to the query= parameter. Be sure to URL-encode your query.

    string uri = host + path + "?mkt=" + market + "&query=" + System.Net.WebUtility.UrlEncode (query);
    
  3. Send the request to the uri constructed above, and print the response.

    HttpResponseMessage response = await client.GetAsync(uri);
    
    string contentString = await response.Content.ReadAsStringAsync();
    Console.WriteLine(contentString);
    
  4. In the main method of your program, call Autosuggest().

    static void Main(string[] args)
    {
        Autosuggest();
        Console.ReadLine();
    }
    

Example JSON response

A successful response is returned in JSON, as shown in the following example:

{
  "_type": "Suggestions",
  "queryContext": {
    "originalQuery": "sail"
  },
  "suggestionGroups": [
    {
      "name": "Web",
      "searchSuggestions": [
        {
          "url": "https://www.bing.com/cr?IG\u003d2ACC4FE8B02F4AACB9182A6502B0E556\u0026CID\u003d1D546424A4CB64AF2D386F26A5CD6583\u0026rd\u003d1\u0026h\u003dgvtP9TS9NwhajSapY2Se6y1eCbP2fq_GiP2n-cxi6OY\u0026v\u003d1\u0026r\u003dhttps%3a%2f%2fwww.bing.com%2fsearch%3fq%3dsailrite%26FORM%3dUSBAPI\u0026p\u003dDevEx,5003.1",
          "displayText": "sailrite",
          "query": "sailrite",
          "searchKind": "WebSearch"
        },
        {
          "url": "https://www.bing.com/cr?IG\u003d2ACC4FE8B02F4AACB9182A6502B0E556\u0026CID\u003d1D546424A4CB64AF2D386F26A5CD6583\u0026rd\u003d1\u0026h\u003dBTS0G6AakxntIl9rmbDXtk1n6rQpsZZ99aQ7ClE7dTY\u0026v\u003d1\u0026r\u003dhttps%3a%2f%2fwww.bing.com%2fsearch%3fq%3dsail%2bsand%2bpoint%26FORM%3dUSBAPI\u0026p\u003dDevEx,5004.1",
          "displayText": "sail sand point",
          "query": "sail sand point",
          "searchKind": "WebSearch"
        },
        {
          "url": "https://www.bing.com/cr?IG\u003d2ACC4FE8B02F4AACB9182A6502B0E556\u0026CID\u003d1D546424A4CB64AF2D386F26A5CD6583\u0026rd\u003d1\u0026h\u003dc0QOA_j6swCZJy9FxqOwke2KslJE7ZRmMooGClAuCpY\u0026v\u003d1\u0026r\u003dhttps%3a%2f%2fwww.bing.com%2fsearch%3fq%3dsailboats%2bfor%2bsale%26FORM%3dUSBAPI\u0026p\u003dDevEx,5005.1",
          "displayText": "sailboats for sale",
          "query": "sailboats for sale",
          "searchKind": "WebSearch"
        },
        {
          "url": "https://www.bing.com/cr?IG\u003d2ACC4FE8B02F4AACB9182A6502B0E556\u0026CID\u003d1D546424A4CB64AF2D386F26A5CD6583\u0026rd\u003d1\u0026h\u003dmnMdREUH20SepmHQH1zlh9Hy_w7jpOlZFm3KG2R_BoA\u0026v\u003d1\u0026r\u003dhttps%3a%2f%2fwww.bing.com%2fsearch%3fq%3dsailing%2banarchy%26FORM%3dUSBAPI\u0026p\u003dDevEx,5006.1",
          "displayText": "sailing anarchy",
          "query": "sailing anarchy",
          "searchKind": "WebSearch"
        },
        {
          "url": "https://www.bing.com/cr?IG\u003d2ACC4FE8B02F4AACB9182A6502B0E556\u0026CID\u003d1D546424A4CB64AF2D386F26A5CD6583\u0026rd\u003d1\u0026h\u003dWLFO-B1GG5qtBGnoU1Bizz02YKkg5fgAQtHwhXn4z8I\u0026v\u003d1\u0026r\u003dhttps%3a%2f%2fwww.bing.com%2fsearch%3fq%3dsailpoint%26FORM%3dUSBAPI\u0026p\u003dDevEx,5007.1",
          "displayText": "sailpoint",
          "query": "sailpoint",
          "searchKind": "WebSearch"
        },
        {
          "url": "https://www.bing.com/cr?IG\u003d2ACC4FE8B02F4AACB9182A6502B0E556\u0026CID\u003d1D546424A4CB64AF2D386F26A5CD6583\u0026rd\u003d1\u0026h\u003dquBMwmKlGwqC5wAU0K7n416plhWcR8zQCi7r-Fw9Y0w\u0026v\u003d1\u0026r\u003dhttps%3a%2f%2fwww.bing.com%2fsearch%3fq%3dsailflow%26FORM%3dUSBAPI\u0026p\u003dDevEx,5008.1",
          "displayText": "sailflow",
          "query": "sailflow",
          "searchKind": "WebSearch"
        },
        {
          "url": "https://www.bing.com/cr?IG\u003d2ACC4FE8B02F4AACB9182A6502B0E556\u0026CID\u003d1D546424A4CB64AF2D386F26A5CD6583\u0026rd\u003d1\u0026h\u003d0udadFl0gCTKCp0QmzQTXS3_y08iO8FpwsoKPHPS6kw\u0026v\u003d1\u0026r\u003dhttps%3a%2f%2fwww.bing.com%2fsearch%3fq%3dsailboatdata%26FORM%3dUSBAPI\u0026p\u003dDevEx,5009.1",
          "displayText": "sailboatdata",
          "query": "sailboatdata",
          "searchKind": "WebSearch"
        },
        {
          "url": "https://www.bing.com/cr?IG\u003d2ACC4FE8B02F4AACB9182A6502B0E556\u0026CID\u003d1D546424A4CB64AF2D386F26A5CD6583\u0026rd\u003d1\u0026h\u003deSSt0MRSbl2V0RFPSuVd-gC7fGOT4717pz55EBUgPec\u0026v\u003d1\u0026r\u003dhttps%3a%2f%2fwww.bing.com%2fsearch%3fq%3dsailor%2b2025%26FORM%3dUSBAPI\u0026p\u003dDevEx,5010.1",
          "displayText": "sailor 2025",
          "query": "sailor 2025",
          "searchKind": "WebSearch"
        }
      ]
    }
  ]
}

Next steps

See also