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Docs > CodeRush Classic > Concepts > Code Analysis > Code Issues > Sealed class cannot be abstract
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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
Can combine initialization with declaration
Can declare MVC view
Can implement base type constructors
Can initialize conditionally
Can inline temporary variable
Can remove type qualifier
Cannot create an instance of abstract class
Cannot create an instance of interface
Cannot create an instance of static class
Cannot declare instance member in a static class
Cannot declare variable of static type
Cannot inherit from sealed type
Cannot inherit from special class 'System.ValueType'
Cannot inherit from static class
Cannot override inherited sealed member
Cannot yield in the body of a catch clause
Cannot yield in the body of a finally clause
Cannot yield in the body of a try block with a catch clause
Case statement has incorrect range of integers expression (VB)
Case statements do not explicitly handle all enum values
Catch block is empty
Class should implement IDisposable
Complex Member
Constant cannot be marked static
Constructor cannot call itself
Constructor must declare a body
Control cannot leave the body of a finally clause
Declaration can be a constant
Default branch is missing
Default Value Can Be Assigned
Delegate can be replaced with lambda expression
Delegate cannot be marked static
Destructor must declare a body
Duplicate code
Duplicate local declaration
Duplicate property declaration
Empty event handler
Empty finally block
Empty namespace declaration
Empty switch statement
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
Lambda parameter has redundant type specification
Member can be static
Member cannot be sealed because it is not an override
Member is not implemented
Member is obsolete
Member must declare a body because it is not marked abstract or extern
Member names cannot be the same as their enclosing type
Method must have a return type
Nested code can be flattened
Null coalescing operation can be used
Only class types can contain destructors
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
Protected member cannot be declared in struct
Protected member in sealed type will be private
Redundant base constructor call
Redundant base qualifier
Redundant constructor
Redundant delegate creation
Redundant destructor
Redundant else statement
Redundant field initialization
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
Unused declaration
Unused member
Unused setter
Unused type parameter
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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Sealed class cannot be abstract

In This Article
Fix
Purpose
Example

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

#Fix

Remove the abstract or sealed modifier from the class declaration.

#Purpose

Highlights the class declarations, which would cause the “An abstract class cannot be sealed or static” compilation error.

#Example

public sealed abstract class │MyClass

Fixes:

public sealed class MyClass

public abstract class MyClass