SwitchCoverageAnalyzer

An analyzer to improve safety and convenience of switch statements in C#.

Features

• Reports a warning for each switch statement on enum value that doesn't contain case labels for all enum members.
• Provides codefixes to insert missing case labels to such switch statements, preserving order.
  • NOTE: Although Visual Studio 2017 provides the codefix to insert missing case labels by default, it doesn't care order of labels.

Example

In the following sample, a warning is reported on the switch statement because of missing the case for Priority.Middle.

public enum Priority
{
    Low,
    Middle,
    High,
}

// WARNING: Missing the case for Priority.Middle.
switch (priority)
{
    case Priority.Low:
        // ...
    case Priority.High:
        // ...
}

Therefore the codefix generates the case in the middle:

switch (priority)
{
    case Priority.Low:
        // ...

    // *GENERATED*
    case Priority.Middle:
        throw new NotImplementedException();

    case Priority.High:
        // ...
}

Note that if the labels aren't sorted by value then generated labels are added before default label (if exists) or on bottom of switch statement.