Add to an ICollection in C#

Add to an ICollection in C#

To add an item to an ICollection<T> in C#, you can use the Add method provided by the ICollection<T> interface. Here's an example:

using System; using System.Collections.Generic; public class Program { public static void Main() { ICollection<string> collection = new List<string>(); // Add items to the collection collection.Add("Item 1"); collection.Add("Item 2"); collection.Add("Item 3"); // Print the collection foreach (string item in collection) { Console.WriteLine(item); } } }

In this example, we create an instance of List<string> which implements the ICollection<T> interface. We use the Add method to add three items to the collection. You can replace List<string> with any other class that implements ICollection<T>.

After adding the items, we iterate over the collection and print each item to the console using a foreach loop.

The Add method is a common method provided by collection interfaces and classes in .NET, including ICollection<T>. It allows you to add items to the collection dynamically.

Examples

  1. "C# add item to ICollection"

    • Code:
      // C# code to add an item to ICollection ICollection<string> collection = new List<string>(); collection.Add("NewItem");

  2. "C# add multiple items to ICollection"

    • Code:
      // C# code to add multiple items to ICollection ICollection<string> collection = new List<string>(); collection.Add("Item1"); collection.Add("Item2");

  3. "C# add object to ICollection"

    • Code:
      // C# code to add an object to ICollection ICollection<MyClass> collection = new List<MyClass>(); MyClass newItem = new MyClass { Property1 = "Value1", Property2 = "Value2" }; collection.Add(newItem);

  4. "C# add range to ICollection"

    • Code:
      // C# code to add a range of items to ICollection ICollection<string> collection = new List<string>(); collection.AddRange(new List<string> { "Item1", "Item2", "Item3" });

  5. "C# add to ICollection in LINQ query"

    • Code:
      // C# code to add to ICollection within a LINQ query ICollection<int> numbers = new List<int> { 1, 2, 3 }; var filteredNumbers = numbers.Where(n => n > 1).Select(n => { collection.Add(n.ToString()); return n; }).ToList();

  6. "C# add item to ICollection if not exists"

    • Code:
      // C# code to add an item to ICollection if it doesn't exist ICollection<string> collection = new List<string>(); string newItem = "New Item"; if (!collection.Contains(newItem)) { collection.Add(newItem); }

  7. "C# add to ICollection using AddRange"

    • Code:
      // C# code to add multiple items to ICollection using AddRange ICollection<string> collection = new List<string>(); collection.AddRange(new[] { "Item1", "Item2", "Item3" });

  8. "C# add item to ICollection with null check"

    • Code:
      // C# code to add an item to ICollection with null check ICollection<string> collection = new List<string>(); string newItem = "New Item"; if (newItem != null) { collection.Add(newItem); }

  9. "C# add to ICollection in parallel"

    • Code:
      // C# code to add items to ICollection in parallel ICollection<int> numbers = new List<int>(); Parallel.ForEach(Enumerable.Range(1, 100), number => { collection.Add(number); });

  10. "C# add item to read-only ICollection"

    • Code:
      // C# code to add an item to a read-only ICollection (if applicable) ICollection<string> collection = new ReadOnlyCollection<string>(new List<string>()); if (collection is List<string> list) { list.Add("New Item"); }

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