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Abstract member cannot be declared in nonabstract class
Abstract member cannot be marked as sealed
Abstract member cannot be marked as virtual
Abstract member cannot be private
Abstract member cannot declare a body
Anonymous method cannot have 'params' parameter
Array elements cannot be of static type
Assignment to global variable
Base type constructors are not implemented
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Cannot create an instance of abstract class
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Cannot create an instance of static class
Cannot declare instance member in a static class
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Cannot inherit from sealed type
Cannot inherit from special class 'System.ValueType'
Cannot inherit from static class
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Destructor must declare a body
Duplicate code
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Environment.NewLine can be used
Extension method cannot have a parameter array used with 'this' modifier
Extension method must be defined in a non-generic static class
Extension method must be defined in a top level static class
Extern member cannot declare a body
Field can be made read-only
Fields should be disposed
ForEach Action can be called
Format item index too large
Generic class cannot derive from Attribute
Hides declaration from the outer scope
Implicit variable can be used
Indexer cannot be static
Initializer can be used
Interface cannot contain constructors
Interface events cannot have add or remove accessors
Interface expected
Interface member cannot have a definition
Keyword 'base' is not valid in a static member
Keyword this (Me) is not valid in a static member
Lambda expression cannot have 'params' parameter
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Member can be static
Member cannot be sealed because it is not an override
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Member must declare a body because it is not marked abstract or extern
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Null coalescing operation can be used
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Operator cannot be abstract
Operator cannot have 'params' parameter
Operator must be declared static and public
Operator must declare a body
Overloaded unary operator takes one parameter
Override member cannot be marked as new
Override member cannot be marked as virtual
Override member cannot change access rights
Parameter modifier 'this' should be the first parameter of extension method
Partial class has only single part
Partial method cannot have access or the virtual, abstract, override, new, sealed, extern modifiers
Partial method cannot have out parameters
Partial method has only single part
Partial method must be declared within a partial class or partial struct
Possibly unassigned variable usage
Property can be auto-implemented
Property cannot have void type
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Protected member in sealed type will be private
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Redundant namespace reference
Redundant private setter
Redundant sealed modifier
Redundant String.Format call
Redundant this qualifier
Redundant ToString call
Redundant type qualifier
Redundant use of this qualifier in the global context
Sealed class cannot be abstract
Statement is not terminated
Static class cannot be abstract
Static class cannot be sealed
Static class cannot contain protected member
Static constructors cannot have access modifiers
Static constructors must be parameterless
String.Compare can be used
String.Format can be used
Struct cannot contain parameterless constructor
Suspicious use of the Equal To operator
Suspicious use of the Unequal To operator
Suspicious use of this qualifier
Ternary expression can be used
The params parameter must be a single dimensional array
The params parameter must be the last parameter in a formal parameter list
Try statement without catch or finally
Type can be moved to separate file
Type name does not correspond to file name
Undeclared element
Undeclared static resource
Undisposed local
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Unused member
Unused setter
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Virtual member call in constructor
Virtual member cannot be declared in sealed class
Virtual member cannot be declared in structures
Virtual member cannot be private
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Static class cannot be sealed

In This Article
Fix
Purpose
Example

CodeRush Classic shows the Static class cannot be sealed code issue if a static class is marked as sealed.

#Fix

Remove the sealed or static modifier from the class declaration.

#Purpose

Highlights the class declarations, which would cause the A class cannot be both static and sealed compilation error.

#Example

public static sealed class │MyClass

Fixes:

public static class MyClass

public sealed class MyClass