C# Error CS8124 – Tuple must contain at least two elements.

C# Error

CS8124 – Tuple must contain at least two elements.

Reason for the Error & Solution

Tuple must contain at least two elements.

Example

The following sample generates CS8124:

// CS8124.cs (4,20)

class C
{
    void M(int x, () y, (int a) z) { }
}

To correct this error

A valid tuple declaration contains two or more elements, ensuring tuple declarations have two or more elements corrects this error:

class C
{
    void M(int x, (int, int) y, (int a, int b) z) { }
}