How to Efficiently Concatenate Large Arrays in C#?

Efficiently connecting arrays in C#

When working with arrays in C#, you often need to combine or concatenate arrays to form a single larger array. While there are multiple ways to accomplish this task, it is crucial to choose the most efficient and appropriate method. A common question is:

How to concatenate two large arrays in C# using a more efficient method than Concat()?

Consider the following array:

<code class="language-c#">int[] x = new int[] { 1, 2, 3 };
int[] y = new int[] { 4, 5 };

int[] z = // 你的答案在这里...

Debug.Assert(z.SequenceEqual(new int[] { 1, 2, 3, 4, 5 }));</code>

Although the Concat() method can be used for array concatenation, its efficiency will be reduced for large arrays. To solve this problem, a more efficient way is to create a new array with appropriate capacity and manually copy the elements from both arrays into the new array:

<code class="language-c#">var z = new int[x.Length + y.Length];
x.CopyTo(z, 0);
y.CopyTo(z, x.Length);</code>

This method does not require the creation of intermediate collections, thus improving performance. It is especially suitable for large arrays, where the overhead of the Concat() method will be more obvious.

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