## Why is this an issue?

Using multidimensional and jagged arrays as method parameters in C# can be challenging for developers.

When these methods are exposed to external users, it requires advanced language knowledge for effective usage.

Determining the appropriate data to pass to these parameters may not be intuitive.

    Public Class Program
        Public Sub WriteMatrix(matrix As Integer()()) ' Noncompliant: data type is not intuitive
            ' ...
        End Sub
    End Class

In this example, it cannot be inferred easily what the matrix should look like. Is it a 2x2 Matrix or even a triangular Matrix?

Using a collection, data structure, or class that provides a more suitable representation of the required data is recommended instead of a multidimensional array or jagged array to enhance code readability.

    Public Class Matrix2x2
        ' ...
    End Class

    Public Class Program
        Public Sub WriteMatrix(matrix As Matrix2x2) ' Compliant: data type is intuitive
            ' ...
        End Sub
    End Class

As a result, avoiding exposing such methods to external users is recommended.

### Exceptions

However, using multidimensional and jagged array method parameters internally, such as in `private` or `internal` methods or within `internal` classes, is compliant since they are not publicly exposed.

    Public Class FirstClass
        Private Sub UpdateMatrix(matrix As Integer()()) ' Compliant: method is private
            ' ...
        End Sub
    End Class

    Friend Class SecondClass
        Public Sub UpdateMatrix(matrix As Integer()()) ' Compliant: class is internal
            ' ...
        End Sub
    End Class

## Resources

### Documentation

- Collections and Data Structures
- Arrays in Visual Basic
- Array Dimensions in Visual Basic