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Articles on Trending Technologies
Technical articles with clear explanations and examples
C# Linq Last() Method
Get the last element from a sequence using the Linq Last() method.The following is our array.int[] val = { 10, 20, 30, 40 };Now, get the last element.val.AsQueryable().Last();Example Live Demousing System; using System.Collections.Generic; using System.Linq; class Demo { static void Main() { int[] val = { 10, 20, 30, 40 }; // getting last element int last_num = val.AsQueryable().Last(); Console.WriteLine("Last element: "+last_num); } }OutputLast element: 40
Read MoreConvert.ToUInt64 Method in C#
Use the Convert.ToUInt64() method to convert a specified value to a 64-bit unsigned integer.The following is our char.char ch = 'a';Now, let’s convert it to a 64-bit unsigned integer.ulong res; res = Convert.ToUInt64(ch);Here is the complete example.Example Live Demousing System; public class Demo { public static void Main() { char ch = 'a'; ulong res; res = Convert.ToUInt64(ch); Console.WriteLine("Converted char value '{0}' to {1}", ch, res); } }OutputConverted char value 'a' to 97
Read MoreThe "0" custom format specifier in C#
The “0” custom specifier is a zero placeholder.If the value to be formatted has a digit in the position where the zero appears in the format string, the the digit is copied to the resultant string. However, if this doesn’t happen, then a zero appears.Here is our double variable.double d; d = 292;Now, by setting the following, you can easily make zero appear in the format string.d.ToString("00000")Example Live Demousing System; using System.Globalization; class Demo { static void Main() { double d; d = 292; Console.WriteLine(d.ToString("00000")); Console.WriteLine(String.Format("{0:00000}", d)); ...
Read More"." custom specifier in C#
The "." custom format specifier adds a localized decimal separator into the output string.The 1st period in the format string determines the location of the decimal separator in the formatted value.double d = 2.3; d.ToString("0.00", CultureInfo.InvariantCultureLet us see another example to learn how to implement “.” Custom specifier.Example Live Demousing System; using System.Globalization; class Demo { static void Main() { double d; d = 3.7; Console.WriteLine(d.ToString("0.00", CultureInfo.InvariantCulture)); Console.WriteLine(String.Format(CultureInfo.InvariantCulture, "{0:0.00}", d)); d = 5.89; Console.WriteLine(d.ToString("00.00", CultureInfo.InvariantCulture)); Console.WriteLine(String.Format(CultureInfo.InvariantCulture, "{0:00.00}", d)); } }Output3.70 3.70 05.89 05.89
Read MoreC# Program to find a key in Dictionary
Firstly, set a Dictionary collection with elements.Dictionary d = new Dictionary() { {1, "Applianes"}, {2, "Clothing"}, {3, "Toys"}, {4, "Footwear"}, {5, "Accessories"} };Now, let’s say you need to check whether key 5 exists or not. For that, use ContainsKey() method. It returns True if key is found.d.ContainsKey(5);Let us see the complete code.Example Live Demousing System; using System.Collections.Generic; public class Program { public static void Main() { Dictionary d = new Dictionary() { {1, "Electronics"}, {2, "Clothing"}, {3, "Toys"}, ...
Read MoreSize of a Three-dimensional array in C#
To get the size of a 3D array in C#, use the GetLength() method with parameter as the index of the dimensions.GetLength(dimensionIndex)To get the size.arr.GetLength(0) arr.GetLength(1) arr.GetLength(2)Example Live Demousing System; class Program { static void Main() { int[,,] arr = new int[3,4,5]; // length of a dimension Console.WriteLine(arr.GetLength(0)); Console.WriteLine(arr.GetLength(1)); Console.WriteLine(arr.GetLength(2)); // length Console.WriteLine(arr.Length); } }Output3 4 5 60
Read MoreFormatException in C#
FomatException is thrown when the format of an argument is invalid.Let us see an example.When we set a value other than int to int.Parse() method, then FormatException is thrown as shown below −Example Live Demousing System; class Demo { static void Main() { string str = "3.5"; int res = int.Parse(str); } }The following error is thrown when the above program is compiled since we have passed a value other than integer.OutputUnhandled Exception: System.FormatException: Input string was not in a correct format.
Read MoreC# Linq Except Method
Get the difference between two arrays using the Except() method.The following are the two arrays.int[] arr = { 9, 12, 15, 20, 35, 40, 55, 67, 88, 92 }; int[] arr2 = { 20, 35 };To get the difference, use Except() method that returns the first list, except the elements in the second list.arr.AsQueryable().Except(arr2);The following is the entire example.Example Live Demousing System; using System.Linq; using System.Collections.Generic; class Program { static void Main() { int[] arr = { 5, 10, 15, 20, 35, 40 }; int[] except = { 20, 35 }; ...
Read MoreC# Linq ElementAt Method
The ElementAt() method in C# to get elements at specified index position.Firstly, set the string array.string[] str = { "Jack", "Pat", "David"};Now, to get the element at a particular index, use the ElementAt() method as shown in the following example −Example Live Demousing System.IO; using System; using System.Linq; class Program { static void Main() { string[] str = { "Jack", "Pat", "David"}; Random r = new Random(DateTime.Now.Second); // to generate random string string res = str.AsQueryable().ElementAt(r.Next(0, str.Length)); Console.WriteLine("Random Name = '{0}'", res); } }OutputRandom Name = 'Jack'
Read MoreC# Linq First() Method
Use the First() method to get the first element from an array.Firstly, set an array.int[] arr = {20, 40, 60, 80 , 100};Now, use the Queryable First() method to return the first element.arr.AsQueryable().First();The following is the entire example.Example Live Demousing System; using System.Linq; using System.Collections.Generic; class Program { static void Main() { int[] arr = {20, 40, 60, 80 , 100}; // getting the first element int res = arr.AsQueryable().First(); Console.WriteLine(res); } }Output20
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