Xamarin.Forms - Bing Video Search Using Cognitive Service

Introduction

Before starting, you can go through the following URL for an overview of Bing Web Search.

• Xamarin.Forms - Bing Web Search Using Cognitive Service

 

Xamarin.Forms code runs on multiple platforms - each of which has its own filesystem. This means that reading and writing files is most easily done using the native file APIs on each platform. Alternatively, embedded resources are a simpler solution to distribute data files with an app.

 

Cognitive Services

 

Xamarin and Cognitive Services together can infuse your apps, websites, and bots with intelligent algorithms to see, hear, speak, understand and interpret your user needs through natural methods of communication. Also, they help you transform your business with AI today.

 

Use AI to solve business problems

• Vision
• Speech
• Knowledge
• Search
• Language

Bing Video Search API

1. Bing Video Search API provides an experience similar to Bing Videos.
2. Bing Video Search API lets you send a search query to Bing and get back a list of relevant videos from the Bing Video Search API.

Prerequisites

• Visual Studio 2017 or Later(Windows or Mac)
• Bing Search API Key

Setting up a Xamarin.Forms Project

 

Start by creating a new Xamarin.Forms project. You’ll learn more by going through the steps yourself.

 

Visual Studio 2019 has more options in the opening window. Clone or check out the code from any repository or, open a project or solution for your computer.

 

Now, you need to click "Create a new project".

 

 

 

Now, filter by Project Type: Mobile

 

Choose the Mobile App (Xamarin. forms) project under C# and Mobile.

 

 

 

Name your app. You probably want your project and solution to use the same name as your app. Put it on your preferred location for projects and click "Create".

 

 

 

Now, select the blank app and target platforms - Android, iOS and Windows (UWP).

 

 

 

Subsequently, go to the solution. In there, you get all the files and sources of your project (.NET Standard). Now, select XAML page and double-click to open the MainPage.Xaml page.

 

You now have a basic Xamarin.Forms app. Click the Play button to try it out.

 

 

 

Get Bing Search API Key

 

In this step, get Bing Search API Key. Go to the following link. 

https://azure.microsoft.com/en-in/services/cognitive-services/

 

Click "Try Cognitive Services for free".

 

 

 

Now, you can choose Bing Search APIs under Search APIs. Afterward, click "Get API Key".

 

Read the terms, and select your country/region. Afterward, click "Next".

 

 

Now, log in using your preferred account.

 

 

Now, the API key is activated. You can use it now.

 

Note

The trial key is available only for 7 days.

 

 

Setting up the User Interface

 

Go to MainPage.Xaml and write the following code.

 

MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:XamarinCognitive"
             x:Class="XamarinCognitive.MainPage">

    <StackLayout>
        <StackLayout>
            <StackLayout HorizontalOptions="Center" VerticalOptions="Start">
                <Image x:Name="imgBanner" Source="banner.png" ></Image>
                <Image Margin="0,0,0,10" x:Name="imgEmail" HeightRequest="100" Source="cognitiveservice.png" ></Image>
                <Label Margin="0,0,0,10" Text="Bing Video Search" FontAttributes="Bold" FontSize="Large" TextColor="Gray" HorizontalTextAlignment="Center" ></Label>
                <Entry x:Name="txtSearch" Placeholder="Type here.."></Entry>
                <Button x:Name="btnSearch" WidthRequest="50" Text="Search" Clicked="BtnSearch_Clicked" />
                <StackLayout HorizontalOptions="CenterAndExpand" Margin="10,0,0,10">
                    <ListView x:Name="listVideos">

                    </ListView>
                </StackLayout>
            </StackLayout>
        </StackLayout>
    </StackLayout>

</ContentPage>

Click the play button to try it out.

 

 

NuGet Packages

 

Now, add the following NuGet Packages.

• Newtonsoft.Json

Add Newtonsoft.Json NuGet

 

Go to Solution Explorer and select your solution. Right-click and select "Manage NuGet Packages for Solution". Search "Newtonsoft.Json" and add Package. Remember to install it for each project (.NET Standard, Android, iO, and UWP).

 

Create a Model

 

In this step, you can create a model for Deserializing your response.

 

ResponseModel.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace XamarinCognitive
{
    public class ResponseModel
    {
        public string _type { get; set; }
        public Instrumentation instrumentation { get; set; }
        public string readLink { get; set; }
        public string webSearchUrl { get; set; }
        public QueryContext queryContext { get; set; }
        public int totalEstimatedMatches { get; set; }
        public List<Value> value { get; set; }
        public int nextOffset { get; set; }
        public List<QueryExpansion> queryExpansions { get; set; }
        public List<PivotSuggestion> pivotSuggestions { get; set; }
        public List<RelatedSearch> relatedSearches { get; set; }
    }
    public class Instrumentation
    {
        public string _type { get; set; }
    }

    public class QueryContext
    {
        public string originalQuery { get; set; }
        public string alterationDisplayQuery { get; set; }
        public string alterationOverrideQuery { get; set; }
        public string alterationMethod { get; set; }
        public string alterationType { get; set; }
    }

    public class Publisher
    {
        public string name { get; set; }
    }

    public class Creator
    {
        public string name { get; set; }
    }

    public class Thumbnail
    {
        public int width { get; set; }
        public int height { get; set; }
    }

    public class Value
    {
        public string webSearchUrl { get; set; }
        public string name { get; set; }
        public string description { get; set; }
        public string thumbnailUrl { get; set; }
        public DateTime datePublished { get; set; }
        public List<Publisher> publisher { get; set; }
        public Creator creator { get; set; }
        public bool isAccessibleForFree { get; set; }
        public bool isFamilyFriendly { get; set; }
        public string contentUrl { get; set; }
        public string hostPageUrl { get; set; }
        public string encodingFormat { get; set; }
        public string hostPageDisplayUrl { get; set; }
        public int width { get; set; }
        public int height { get; set; }
        public string duration { get; set; }
        public string motionThumbnailUrl { get; set; }
        public string embedHtml { get; set; }
        public bool allowHttpsEmbed { get; set; }
        public int viewCount { get; set; }
        public Thumbnail thumbnail { get; set; }
        public string videoId { get; set; }
        public bool allowMobileEmbed { get; set; }
        public bool isSuperfresh { get; set; }
    }

    public class Thumbnail2
    {
        public string thumbnailUrl { get; set; }
    }

    public class QueryExpansion
    {
        public string text { get; set; }
        public string displayText { get; set; }
        public string webSearchUrl { get; set; }
        public string searchLink { get; set; }
        public Thumbnail2 thumbnail { get; set; }
    }

    public class Thumbnail3
    {
        public string thumbnailUrl { get; set; }
    }

    public class Suggestion
    {
        public string text { get; set; }
        public string displayText { get; set; }
        public string webSearchUrl { get; set; }
        public string searchLink { get; set; }
        public Thumbnail3 thumbnail { get; set; }
    }

    public class PivotSuggestion
    {
        public string pivot { get; set; }
        public List<Suggestion> suggestions { get; set; }
    }

    public class Thumbnail4
    {
        public string thumbnailUrl { get; set; }
    }

    public class RelatedSearch
    {
        public string text { get; set; }
        public string displayText { get; set; }
        public string webSearchUrl { get; set; }
        public string searchLink { get; set; }
        public Thumbnail4 thumbnail { get; set; }
    }

}

Bing Video Search

 

In this step, write the following code for Bing Video Search.

 

MainPage.xaml.cs

using Xamarin.Forms;
using Newtonsoft.Json;
namespace XamarinCognitive
{
    public partial class MainPage : ContentPage
    {
        public static string APIKey = "a30148ca5fc********e49b554fc4f683";
        public static string baseURl = "https://api.cognitive.microsoft.com/bing/v7.0/videos/search";
        struct SearchResult
        {
            public String jsonResult;
            public Dictionary<String, String> relevantHeaders;
        }

        List<string> videoList = new List<string>();
        public MainPage()
        {
            InitializeComponent();
        }

        private void BtnSearch_Clicked(object sender, EventArgs e)
        {
            SearchResult bingResult = BingVideoSearch(txtSearch.Text);
            var res = JsonConvert.DeserializeObject<ResponseModel>(bingResult.jsonResult);
            for (int i = 0; i < res.value.Count; i++)
            {
                videoList.Add(res.value[i].name);
            }
            listVideos.ItemsSource = videoList;
        }

        //Bing Video Search
        static SearchResult BingVideoSearch(string searchQuery)
        {
            var uriQuery = baseURl + "?q=" + Uri.EscapeDataString(searchQuery);
            WebRequest request = HttpWebRequest.Create(uriQuery);
            request.Headers["Ocp-Apim-Subscription-Key"] = APIKey;
            HttpWebResponse response = (HttpWebResponse)request.GetResponseAsync().Result;
            string json = new StreamReader(response.GetResponseStream()).ReadToEnd();
            var searchResult = new SearchResult();
            searchResult.jsonResult = json;
            searchResult.relevantHeaders = new Dictionary<String, String>();
            foreach (String header in response.Headers)
            {
                if (header.StartsWith("BingAPIs-") || header.StartsWith("X-MSEdge-"))
                    searchResult.relevantHeaders[header] = response.Headers[header];
            }
            return searchResult;
        }
    }
}

Click the "Play" button to try it out.

 

 

Bing Web Result 

 

 

 

I hope you have understood how to search for videos using Bing Search API using Cognitive Service Bing Search API in Xamarin.Forms.

Thanks for reading. Please share comments and feedback. Happy Coding :)