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CA1505: Avoid unmaintainable code

Visual Studio 2010

TypeName

AvoidUnmantainableCode

CheckId

CA1505

Category

Microsoft.Maintainability

Breaking Change

Non-breaking

A type or method has a low maintainability index value.

The maintainability index is calculated by using the following metrics: lines of code, program volume, and cyclomatic complexity. Program volume is a measure of the difficulty of understanding of a type or method that is based on the number of operators and operands in the code. Cyclomatic complexity is a measure of the structural complexity of the type or method. You can learn more about code metrics at Measuring Complexity and Maintainability of Managed Code.

A low maintainability index indicates that a type or method is probably difficult to maintain and would be a good candidate to redesign.

To fix this violation, redesign the type or method and try to split it into smaller and more focused types or methods.

Exclude this warning when a type or method is still considered maintainable despite its large size or when the type or method cannot be split.

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Supressing does not work well
When I use a right-click on an error message to suppress this, it is suppressed for the entire class, which seems silly.
I tried to suppress it just for a method, without success, as follows: [method: SuppressMessage("Microsoft.Maintainability", "CA1505:AvoidUnmaintainableCode", Justification = "Obvious system")] immediately before the method - why does that not work?
Some examples would help here.
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