C# | Array.TrueForAll() Method Last Updated : 08 Jul, 2021 Comments Improve Suggest changes Like Article Like Report This method is used to determine whether every element in the array matches the conditions defined by the specified predicate.Syntax: public static bool TrueForAll (T[] array, Predicate<T> match); Here, T is the type of element of the array.Parameters: array: It is the one-dimensional, zero-based Array to check against the conditions. match: It is the predicate that defines the conditions to check against the elements. Return Value: This method returns true if every element in the array matches the conditions defined by the specified predicate otherwise it returns false. If there are no elements in the array, the return value is true.Exception: This method throws ArgumentNullException if the array is null or the match is null.Below programs illustrate the use of Array.TrueForAll(T[], Predicate) Method:Example 1: CSHARP // C# program to demonstrate // TrueForAll() method using System; using System.Collections.Generic; public class GFG { // Main Method public static void Main() { try { // Creating and initializing new the String String[] myArr = {"Sun", "Son", "Sue", "Shu"}; // Display the values of the myArr. Console.WriteLine("Initial Array:"); // calling the PrintIndexAndValues() // method to print PrintIndexAndValues(myArr); // getting the bool value // with required condition // using method TrueForAll() bool value = Array.TrueForAll(myArr, element => element.StartsWith("S", StringComparison.Ordinal)); // Checking the condition if (value) Console.Write("Every Element is satisfying condition"); else Console.Write("Every Element is not satisfying condition"); } catch (ArgumentException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } // Defining the method // PrintIndexAndValues public static void PrintIndexAndValues(String[] myArr) { for (int i = 0; i < myArr.Length; i++) { Console.WriteLine("{0}", myArr[i]); } Console.WriteLine(); } } Output: Initial Array: Sun Son Sue Shu Every Element is satisfying condition Example 2: For ArgumentNullException CSHARP // C# program to demonstrate // TrueForAll() method // For ArgumentNullException using System; using System.Collections.Generic; public class GFG { // Main Method public static void Main() { try { // Creating and initializing new // the String with a null value String[] myArr = null; // getting the bool value // with required condition // using method TrueForAll() Console.WriteLine("Trying to get the boolean " +"value while myArr is null"); Console.WriteLine(); bool value = Array.TrueForAll(myArr, element => element.StartsWith("S", StringComparison.Ordinal)); // Checking the condition if (value) Console.Write("Every Element is satisfying condition"); else Console.Write("Every Element is not satisfying condition"); } catch (ArgumentException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } // Defining the method // PrintIndexAndValues public static void PrintIndexAndValues(String[] myArr) { for (int i = 0; i < myArr.Length; i++) { Console.WriteLine("{0}", myArr[i]); } Console.WriteLine(); } } Output: Trying to get the boolean value while myArr is null Exception Thrown: System.ArgumentNullException Reference: https://docs.microsoft.com/en-us/dotnet/api/system.array.trueforall?view=netframework-4.7.2 Comment More infoAdvertise with us Next Article C# | Array.TrueForAll() Method rohitprasad3 Follow Improve Article Tags : C# CSharp-method CSharp-Arrays Similar Reads C# | Array.Find() Method This method is used to search for an element that matches the conditions defined by the specified predicate and returns the first occurrence within the entire Array. 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