How to Remove Elements from a Regular Array in .NET?

Efficiently Removing Elements from .NET Arrays

Unlike dynamic arrays like List<T>, standard .NET arrays lack a direct Remove method. This article explores effective strategies for removing elements from regular arrays.

Leveraging LINQ for Element Removal

A concise approach utilizes LINQ to filter and reconstruct the array:

<code class="language-csharp">var foos = new Foo[] { foo1, foo2, foo3, foo4 };
foos = foos.Where(f => f.Id != idToRemove).ToArray();</code>

This converts the array to a List<T>, filters out the unwanted element based on a condition (here, f.Id != idToRemove), and then converts the filtered list back into an array.

Custom Extension Method for RemoveAt Functionality

For more control, a custom extension method mimicking the RemoveAt behavior can be implemented:

<code class="language-csharp">public static T[] RemoveAt<T>(this T[] source, int index)
{
    if (index < 0 || index >= source.Length)
        throw new ArgumentOutOfRangeException(nameof(index));

    T[] dest = new T[source.Length - 1];
    Array.Copy(source, 0, dest, 0, index);
    Array.Copy(source, index + 1, dest, index, source.Length - index - 1);
    return dest;
}</code>

This method efficiently handles edge cases and copies elements before and after the specified index to a new array, effectively removing the element at the given index. Usage:

<code class="language-csharp">Foo[] foos = GetFoos();
foos = foos.RemoveAt(2);</code>

This offers a more direct replacement for the missing RemoveAt functionality in regular arrays. Remember that both methods create a new array; the original array remains unchanged. Choose the method best suited to your needs and coding style.

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