When the ASP.NET Web API calls a method on a controller, it must set values for the parameters, a process called parameter binding.In order to bind a model (an action parameter), that would normally default to a formatter, from the URI we need to decorate it with [FromUri] attribute. FromUriAttribute simply inherits from ModelBinderAttribute, providing us a shortcut directive to instruct Web API to grab specific parameters from the URI using the ValueProviders defined in the IUriValueProviderFactory. The attribute itself is sealed and cannot be extended any further, but you add as many custom IUriValueProviderFactories as you wish.The [FromBody] attribute ... Read More

Suppose we have a string of lowercase characters (all are ASCII characters), we have to find all distinct continuous palindromic sub-strings of the given string.So, if the input is like "level", then the output will be 7 as there are seven substrings ['level', 'eve', 'l', 'e', 'v', 'e', 'l'].To solve this, we will follow these steps −N := 26n := length of strsum := 0my_map := a list of size N and fill with 0for i in range 0 to n, domy_map[ASCII of (str[i]) - ASCII of ('a') ] := my_map[ASCII of (str[i]) - ASCII of ('a') ] + 1for ... Read More

The Task.WaitAll blocks the current thread until all other tasks have completed execution. The Task.WhenAll method is used to create a task that will complete if and only if all the other tasks have completed.If we are using Task.WhenAll we will get a task object that isn’t complete. However, it will not block but will allow the program to execute. On the contrary, the Task.WaitAll method call actually blocks and waits for all other tasks to complete.To understand with an example, let us say we have a task that performs some activity with the UI thread say some animation needs ... Read More

Suppose we have a grid of size Q * P, this grid contains exactly three asterisk '*' and every other cell there is dot '.', where '*' is for a vertex of a rectangle. We have to find the coordinates of the missing vertex. Here we will consider 1-based indexing.So, if the input is like grid = [ ".*.", "...", "*.*" ], then the output will be [1, 3], this is the missing coordinate.To solve this, we will follow these steps −p := number of rowsq := number of columnsrow := make a map for all row number, and associated ... Read More

A file can be downloaded from a URL using web client. It is available in System.Net namespace.The WebClient class provides common methods for sending data to or receiving data from any local, intranet, or Internet resource identified by a URI.The web client can be said as an application or web browser (like Google Chrome, Internet Explorer, Opera, Firefox, Safari) which is installed in a computer and used to interact with Web servers upon user’s request. It is basically a consumer application which collects processed data from servers.A Client and a Server are two parts of a connection, these are two ... Read More

In this article, we will learn to solve a popular problem that involves finding the closest element in a binary search tree (BST) to a given target value. There are two methods to solve this problem: Brute Force Method (Inorder Traversal) Optimized Method (DFS Traversal) Before moving to the solution, let's understand the problem statement in detail. Find the Closest Element in Binary Search Tree Given a binary search tree (BST) and a target value K, the task is to find a node in BST, whose value is ... Read More

XML is a self-describing language and it gives the data as well as the rules to identify what information it contains. Like HTML, XML is a subset of SGML - Standard Generalized Markup Language.The XDocument class contains the information necessary for a valid XML document. This includes an XML declaration, processing instructions, and comments.Note that we only have to create XDocument objects if we require the specific functionality provided by the XDocument class. In many circumstances, we can work directly with XElement. Working directly with XElement is a simpler programming model.XDocument derives from XContainer. Therefore, it can contain child nodes. ... Read More

Suppose we have a string str and another string patt, we have to find determine the character in patt that is present at the minimum index of str. If no character patt1 is present in str1 then return -1.So, if the input is like str = "helloworld" and patt = "wor", then the output will be 'o' as 'o' is present at minimum index in strTo solve this, we will follow these steps −for i in range 0 to size of patt, dofor j in range 0 to size of Str, doif patt[i] is same as Str[j] and j < ... Read More

Suppose we have a 2D matrix and a set of cell indexes. Cell indices are represented as (i, j) where i is row and j is column, now, for every given cell index (i, j), we have to find the sums of all matrix elements excluding the elements present in ith row and/or jth column.So, if the input is like223457643cell indices = [(0, 0), (1, 1), (0, 1)], then the output will be [19, 14, 20]To solve this, we will follow these steps −n := size of ind_arrans := a new listfor i in range 0 to n, doSum := ... Read More

Suppose we have a string in lowercase alphabets, we have to find substrings that contain all the vowels at least once and there exist no consonants in that substrings.So, if the input is like "helloworldaeiouaieuonicestring", then the output will be ['aeiou', 'aeioua', 'aeiouai', 'aeiouaiu', 'eioua', 'eiouai', 'eiouaiu']To solve this, we will follow these steps −n := size of sfor i in range 0 to n, domy_map := a new mapfor j in range i to n, doif s[j] not vowel, thencome out from the loopmy_map[s[j]] := 1if size of my_map is same as 5, thendisplay s[from index i to j ... Read More