How to Efficiently Create Cloned Subarrays in C#?

Efficiently create cloned subarrays in C#

When working with arrays, it is often necessary to create a subarray containing a specific range of elements from an existing array. While this can be achieved by manually looping and copying elements, there are more efficient and cleaner methods.

To create cloned subarrays, extension methods can be used. Here’s how to do it:

public static T[] SubArray<T>(this T[] data, int index, int length)
{
    T[] result = new T[length];
    Array.Copy(data, index, result, 0, length);
    return result;
}

How to use it:

int[] data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
int[] sub = data.SubArray(3, 4); // 包含 {3, 4, 5, 6}

For cloned subarrays whose elements are complex objects, you can use serialization for deep copying:

public static T[] SubArrayDeepClone<T>(this T[] data, int index, int length)
{
    T[] arrCopy = new T[length];
    Array.Copy(data, index, arrCopy, 0, length);
    using (MemoryStream ms = new MemoryStream())
    {
        var bf = new BinaryFormatter();
        bf.Serialize(ms, arrCopy);
        ms.Position = 0;
        return (T[])bf.Deserialize(ms);
    }
}

This method requires the object to be serializable.

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