adding new C# quickstart

Author: aahill

dotnet/Search/BingImageSearchv7Quickstart.cs

@@ -0,0 +1,83 @@
+//Copyright (c) Microsoft Corporation. All rights reserved.
+//Licensed under the MIT License.
+
+using System;
+using System.Net;
+using System.IO;
+using System.Collections.Generic;
+using Newtonsoft.Json.Linq;
+
+namespace BingSearchApisQuickstart
+{
+
+    class Program
+    {
+
+        // Replace this string value with your valid access key.
+        const string subscriptionKey = "bbfb78ad189649248750011e83b7b22d";
+
+        // Verify the endpoint URI. If you encounter unexpected authorization errors,
+        // double-check this value against the Bing search endpoint in your Azure dashboard.
+        const string uriBase = "https://api.cognitive.microsoft.com/bing/v7.0/images/search";
+
+        const string searchTerm = "tropical ocean";
+
+        // A struct to return image search results seperately from headers
+        struct SearchResult
+        {
+            public string  jsonResult;
+            public Dictionary<String, String> relevantHeaders;
+        }
+
+        static void Main()
+        {
+            Console.OutputEncoding = System.Text.Encoding.UTF8;
+
+            Console.WriteLine("Searching images for: " + searchTerm + "\n");
+            //send a search request using the search term
+            SearchResult result = BingImageSearch(searchTerm);
+            //deserialize the JSON response from the Bing Image Search API
+            dynamic jsonObj = Newtonsoft.Json.JsonConvert.DeserializeObject(result.jsonResult);
+
+            var firstJsonObj = jsonObj["value"][0];
+            Console.WriteLine("Title for the first image result: " + firstJsonObj["name"]+"\n");
+            //After running the application, copy the output URL into a browser to see the image. 
+            Console.WriteLine("URL for the first image result: " + firstJsonObj["webSearchUrl"]+"\n");
+
+            Console.Write("\nPress Enter to exit ");
+            Console.ReadLine();
+        }
+
+        /// <summary>
+        /// Performs a Bing Image search and return the results as a SearchResult.
+        /// </summary>
+        static SearchResult BingImageSearch(string searchQuery)
+        {
+            // Construct the URI of the search request
+            var uriQuery = uriBase + "?q=" + Uri.EscapeDataString(searchQuery);
+
+            // Perform the Web request and get the response
+            WebRequest request = WebRequest.Create(uriQuery);
+            request.Headers["Ocp-Apim-Subscription-Key"] = subscriptionKey;
+            HttpWebResponse response = (HttpWebResponse)request.GetResponseAsync().Result;
+            string json = new StreamReader(response.GetResponseStream()).ReadToEnd();
+
+            // Create result object for return
+            var searchResult = new SearchResult()
+            {
+                jsonResult = json,
+                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;
+        }
+
+    }
+}