WebClient.QueryString Property
Gets or sets a collection of query name/value pairs associated with the request.
Assembly: System (in System.dll)
Property Value
Type: System.Collections.Specialized.NameValueCollectionA NameValueCollection that contains query name/value pairs associated with the request. If no pairs are associated with the request, the value is an empty NameValueCollection.
The QueryString property contains a NameValueCollection instance containing name/value pairs that are appended to the URI as a query string. The contents of the QueryString property are preceded by a question mark (?), and name/value pairs are separated from one another by an ampersand (&).
The following code example takes user input from the command line and builds a NameValueCollection that is assigned to the QueryString property. It then downloads the response from the server to a local file.
string uriString = "http://www.contoso.com/search"; // Create a new WebClient instance. WebClient myWebClient = new WebClient(); // Create a new NameValueCollection instance to hold the QueryString parameters and values. NameValueCollection myQueryStringCollection = new NameValueCollection(); Console.Write("Enter the word(s), separated by space character to search for in " + uriString + ": "); // Read user input phrase to search for at uriString. string searchPhrase = Console.ReadLine(); if (searchPhrase.Length > 1) // Assign the user-defined search phrase. myQueryStringCollection.Add("q",searchPhrase); else // If error, default to search for 'Microsoft'. myQueryStringCollection.Add("q","Microsoft"); // Assign auxilliary parameters required for the search. Console.WriteLine("Searching " + uriString + " ......."); // Attach QueryString to the WebClient. myWebClient.QueryString = myQueryStringCollection; // Download the search results Web page into 'searchresult.htm' for inspection. myWebClient.DownloadFile (uriString, "searchresult.htm"); Console.WriteLine("\nDownload of " + uriString + " was successful. Please see 'searchresult.htm' for results.");
Available since 1.1