Refactorings.md

Roslynator Refactorings

Add braces (RR0002)

• Syntax: do statement, else clause, fixed statement, for statement, foreach statement, if statement, lock statement, using statement, while statement
• Span: embedded statement

Add braces to if-else (RR0003)

• Syntax: if-else chain
• Span: embedded statement

Add braces to switch section (RR0004)

• Syntax: switch section
• Span: case or default keyword

Add braces to switch sections (RR0005)

• Syntax: switch statement
• Span: case or default keyword

Add cast expression (RR0006)

• Syntax: argument, assignment expression, return statement, variable declaration

Add default value to parameter (RR0007)

• Syntax: parameter without default value
• Span: identifier

Add default value to return statement (RR0008)

• Syntax: return statement without expression

Add empty line between declarations (RR0205)

• Syntax: selected declarations

Before

private object x;
private object y;
private object z;

After

private object x;

private object y;

private object z;

Add exception to documentation comment (RR0009)

• Syntax: throw statement

Add identifier to parameter (RR0012)

• Syntax: parameter
• Span: missing identifier

Add identifier to variable declaration (RR0010)

• Syntax: variable declaration

Add member to interface (RR0195)

• Syntax: method, property, indexer, event
• Span: identifier

Before

public class Foo : IFoo
{
    public void Bar()
    {
    }
}

public interface IFoo
{
}

After

public class Foo : IFoo
{
    public void Bar()
    {
    }
}

public interface IFoo
{
    void Bar();
}

Add missing cases to switch statement (RR0059)

• Syntax: switch statement

Before

switch (dayOfWeek)
{
    case DayOfWeek.Sunday:
        break;
    case DayOfWeek.Monday:
        break;
    case DayOfWeek.Tuesday:
        break;
    case DayOfWeek.Wednesday:
        break;
    case DayOfWeek.Thursday:
        break;
}

After

switch (dayOfWeek)
{
    case DayOfWeek.Sunday:
        break;
    case DayOfWeek.Monday:
        break;
    case DayOfWeek.Tuesday:
        break;
    case DayOfWeek.Wednesday:
        break;
    case DayOfWeek.Thursday:
        break;
    case DayOfWeek.Friday:
        break;
    case DayOfWeek.Saturday:
        break;
}

Add parameter name to argument (RR0011)

• Syntax: argument list

Add parameter to interface member (RR0213)

• Syntax: method declaration, indexer declaration
• Span: method name or 'this' keyword

Before

interface IFoo
{
    void Bar(object p);
}

class Foo : IFoo
{
    public void Bar(object p, object p2)
    {
    }
}

After

interface IFoo
{
    void Bar(object p, object p2);
}

class Foo : IFoo
{
    public void Bar(object p, object p2)
    {
    }
}

Add tag to documentation comment (RR0208)

• Syntax: selected word(s) in documentation comment

Before

/// <summary>
/// null
/// </summary>
public class Foo
{
}

After

/// <summary>
/// <c>null</c>
/// </summary>
public class Foo
{
}

Add type parameter (RR0178)

• Syntax: class declaration, struct declaration, interface declaration, delegate declaration, method declaration, local function

Add using directive (RR0013)

• Syntax: qualified name
• Span: selected namespace

Add using static directive (RR0014)

• Syntax: member access expression (public or internal static class)
• Span: selected class name

Call 'ConfigureAwait(false)' (RR0015)

• Syntax: awaitable method invocation
• Span: method name

Call extension method as instance method (RR0016)

• Syntax: method invocation

Call string.IndexOf instead of string.Contains (RR0144)

• Syntax: method invocation
• Span: method name

Before

if (s.Contains("a"))
{
{

After

if (s.IndexOf("a", StringComparison.OrdinalIgnoreCase) != -1)
{
{

Call 'To...' method (ToString, ToArray, ToList) (RR0017)

• Syntax: argument, assignment expression, return statement, variable declaration

Change accessibility (RR0186)

• Syntax: access modifier

Change explicit type to 'var' (RR0018)

• Syntax: variable declaration, foreach statement
• Span: type

Change method return type to 'void' (RR0021)

• Syntax: method, local function

Change method/property/indexer type according to return expression (RR0019)

• Syntax: return statement in method/property/indexer

Change method/property/indexer type according to yield return expression (RR0020)

• Syntax: yield return statement in method/property/indexer

Change type according to expression (RR0022)

• Syntax: variable declaration, foreach statement
• Span: type

Before

IEnumerable<object> items = new List<object>();

After

List<object> items = new List<object>();

Change 'var' to explicit type (RR0023)

• Syntax: variable declaration, foreach statetement
• Span: type

Check expression for null (RR0024)

• Syntax: local declaration (identifier), assignment expression (left)

Check parameter for null (RR0025)

• Syntax: parameter
• Span: parameter identifier

Collapse to initalizer (RR0026)

• Syntax: object creation followed with assignment(s)

Comment out member (RR0027)

• Syntax: method, constructor, property, indexer, operator, event, namespace, class, struct, interface
• Span: opening or closing brace

Comment out statement (RR0028)

• Syntax: do statement, fixed statement, for statement, foreach statement, checked statement, if statement, lock statement, switch statement, try statement, unchecked statement, unsafe statement, using statement, while statement
• Span: opening or closing brace

Convert "" to string.Empty (RR0171)

• Syntax: empty string literal

Convert '(yield) return' to 'if' (RR0143)

• Syntax: return statement, yield return statement
• Span: selected statement, yield keyword or return keyword

Convert ?: to if-else (RR0120)

• Syntax: ?: operator that is part of local declaration, assignment or (yield) return statement

Before

string s = (x) ? "a" : "b";

After

string s;
if (x)
{
    s = "a";
}
else
{
    s = "b";
}

---

Before

string s = (x) ? "a" : (y) ? "b" : "c";

After

string s;
if (x)
{
    s = "a";
}
else if (y)
{
    s = "b";
}
else
{
    s = "c";
}

Convert comment to documentation comment (RR0192)

• Syntax: single-line comment

Before

// comment
public class Foo
{
}

After

/// <summary>
/// comment
/// </summary>
public class Foo
{
}

Convert 'do' to 'while' (RR0123)

• Syntax: do statement
• Span: do keyword

Before

do
{
} while (condition);

After

while (condition)
{
}

Convert 'for' to 'foreach' (RR0130)

• Syntax: for statement

Convert 'for' to 'while' (RR0131)

• Syntax: for statement
• Span: for keyword or selected for statement

Convert 'foreach' to 'for' (RR0129)

• Syntax: foreach statement

Convert 'foreach' to 'for' and reverse loop (RR0188)

• Syntax: foreach statement

Before

foreach (object item in items)
{
    yield return item;
}

After

for (int i = items.Count - 1; i >= 0; i--)
{
    yield return items[i];
}

Convert hexadecimal literal to decimal literal (RR0132)

• Syntax: hexadecimal literal

Convert 'if' to ?: (RR0166)

• Syntax: if statement
• Span: top if keyword or selected if statement

Convert 'if' to 'switch' (RR0133)

• Syntax: if statement
• Span: top if keyword or selected if statement

Before

var ch = stringReader.Read();

if (ch == 10 || ch == 13)
{
    return;
}
else
{
    stringBuilder.Append(ch);
}

After

var ch = stringReader.Read();

switch (ch)
{
    case 10:
    case 13:
        {
            return;
        }

    default:
        {
            stringBuilder.Append(ch);
            break;
        }
}

Convert interpolated string to concatenation (RR0193)

• Syntax: interpolated string

Before

string s = $"a{b}c";

After

string s = "a" + b + "c";

Convert interpolated string to string literal (RR0136)

• Syntax: Interpolated string without any interpolation

Convert interpolated string to 'string.Format' (RR0201)

• Syntax: interpolated string

Before

$"name: {name,0:f}, value: {value}"

After

string.Format("name: {0,0:f} value: {1}", name, value)

Convert regular string literal to verbatim string literal (RR0142)

• Syntax: regular string literal

Convert statements to if-else (RR0211)

• Syntax: selected statements (first statement must be 'if' statement)

Before

if (x)
    return 1;

if (y)
{
    return 2;
}
else if (z)
{
    return 3;
}

return 0;

After

if (x)
{
    return 1;
}
else if (y)
{
    return 2;
}
else if (z)
{
    return 3;
}
else
{
    return 0;
}

Convert 'string.Format' to interpolated string (RR0145)

• Syntax: string.Format method

Convert 'switch to 'if' (RR0147)

• Syntax: switch statement
• Span: switch keyword

Convert verbatim string literal to regular string literal (RR0148)

• Syntax: verbatim string literal

Convert verbatim string literal to regular string literals (RR0149)

• Syntax: multiline verbatim string literal

Convert 'while' statement to 'do' statement (RR0150)

• Syntax: while statement
• Span: while keyword

Before

while (condition)
{
}

After

if (condition)
{
  do
  {
  } while (condition);
}

Convert 'while' statement to 'for' statement (RR0151)

• Syntax: while statement
• Span: while keyword or selected statement(s)

Copy documentation comment from base member (RR0029)

• Syntax: constructor, method, property, indexer, event

Duplicate argument (RR0030)

• Syntax: missing argument

Duplicate member (RR0031)

• Syntax: method, constructor, property, indexer, operator, event, namespace, class, struct, interface
• Span: opening or closing brace

Duplicate parameter (RR0032)

• Syntax: missing parameter

Duplicate statement (RR0033)

• Syntax: do statement, fixed statement, for statement, foreach statement, checked statement, if statement, lock statement, switch statement, try statement, unchecked statement, unsafe statement, using statement, while statement
• Span: opening or closing brace

Duplicate switch section (RR0212)

• Syntax: switch section
• Span: close brace or empty line after switch section

Before

switch (s)
{
    case "a":
        {
            // ...

            break;
        }
    default:
        {
            break;
        }
}

After

switch (s)
{
    case "a":
        {
            // ...

            break;
        }
    case "a":
        {
            // ...

            break;
        }
    default:
        {
            break;
        }
}

Expand coalesce expression (RR0035)

• Syntax: coalesce expression
• Span: ?? operator

Expand compound assignment operator (RR0034)

• Syntax: compound assignment expression
• Span: operator

Expand event (RR0036)

• Syntax: event field declaration

Expand expression body (RR0037)

• Syntax: expression body

Expand initializer (RR0038)

• Syntax: initializer

Expand lambda expression body (RR0039)

• Syntax: lambda expression
• Span: body

Expand property (RR0040)

• Syntax: auto-property

Expand property and add backing field (RR0041)

• Syntax: auto-property

Extract event handler method (RR0203)

• Syntax: lambda expression

Before

void Foo()
{
  x.Changed += (s, e) => Bar();
}

After

void Foo()
{
  x.Changed += Changed;
}

void OnChanged(object sender, EventArgs e)
{
  Bar();
}

Extract expression from condition (RR0043)

• Syntax: if statement, while statement
• Span: condition

Before

if (x && y) // Select 'y'
{
}

After

if(x)
{
    if (y)
    {
    }
}

---

Before

if (x || y) // Select 'y'
{
}

After

if(x)
{
}

if (y)
{
}

Extract generic type (RR0044)

• Syntax: generic name with single type argument
• Span: type argument

Extract statement(s) (RR0045)

• Syntax: else clause, fixed statement, for statement, foreach statement, checked statement, if statement, lock statement, try statement, unsafe statement, using statement, while statement

Extract type declaration to a new file (RR0046)

• Syntax: class declaration, struct declaration, interface declaration, enum declaration, delegate declaration
• Span: identifier

Format accessor braces (RR0047)

• Syntax: get accessor, set accessor, add accessor, remove accessor
• Span: block

Format argument list (RR0048)

• Syntax: argument list

Format binary expression (RR0049)

• Syntax: logical and/or expression, bitwise and/or expression

Format conditional expression (RR0050)

• Syntax: conditional expression

Format constraint clauses (RR0187)

• Syntax: type parameter constraint clause

Before

private void Foo<T1, T2, T3>() where T1 : class where T2 : class where T3 : class
{
}

After

private void Foo<T1, T2, T3>()
    where T1 : class
    where T2 : class
    where T3 : class
{
}

Format expression chain (RR0051)

• Syntax: expression chain

Format initializer (RR0052)

• Syntax: initializer

Format parameter list (RR0053)

• Syntax: parameter list

Generate base constructors (RR0054)

• Syntax: class declaration
• Span: identifier

Generate combined enum member (RR0055)

• Syntax: enum declaration (with FlagsAttribute)

Generate enum member (RR0056)

• Syntax: enum declaration (with FlagsAttribute)

Generate enum values (RR0057)

• Syntax: enum declaration (with FlagsAttribute)

Generate event invoking method (RR0058)

• Syntax: event
• Span: identifier

Generate property for DebuggerDisplay attribute (RR0204)

• Syntax: DebuggerDisplay attribute

Before

[DebuggerDisplay("A: {A} B: {B}")]
public class Foo
{
    public string A { get; }
    public string B { get; }
}

After

DebuggerDisplay("{DebuggerDisplay,nq}")]
public class Foo
{
    public string A { get; }
    public string B { get; }

    [DebuggerBrowsable(DebuggerBrowsableState.Never)]
    private string DebuggerDisplay
    {
        get { return $"A: {A} B: {B}"; }
    }
}

Implement custom enumerator (RR0210)

• Syntax: class that implements IEnumerable<T>
• Span: identifier

Before

using System;
using System.Collections;
using System.Collections.Generic;

class C<T> : IEnumerable<T>
{
    IEnumerator<T> IEnumerable<T>.GetEnumerator()
    {
        throw new NotImplementedException();
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        throw new NotImplementedException();
    }
}

After

using System;
using System.Collections;
using System.Collections.Generic;

class C<T> : IEnumerable<T>
{
    IEnumerator<T> IEnumerable<T>.GetEnumerator()
    {
        throw new NotImplementedException();
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        throw new NotImplementedException();
    }

    public Enumerator GetEnumerator()
    {
        return new Enumerator(this);
    }

    public struct Enumerator
    {
        private readonly C<T> _c;
        private int _index;

        internal Enumerator(C<T> c)
        {
            _c = c;
            _index = -1;
        }

        public T Current
        {
            get
            {
                throw new NotImplementedException();
            }
        }

        public bool MoveNext()
        {
            throw new NotImplementedException();
        }

        public void Reset()
        {
            _index = -1;
            throw new NotImplementedException();
        }

        public override bool Equals(object obj)
        {
            throw new NotSupportedException();
        }

        public override int GetHashCode()
        {
            throw new NotSupportedException();
        }
    }

    //TODO: IEnumerable.GetEnumerator() and IEnumerable<T>.GetEnumerator() should return instance of EnumeratorImpl.
    private class EnumeratorImpl : IEnumerator<T>
    {
        private Enumerator _e;

        internal EnumeratorImpl(C<T> c)
        {
            _e = new Enumerator(c);
        }

        public T Current
        {
            get
            {
                return _e.Current;
            }
        }

        object IEnumerator.Current
        {
            get
            {
                return _e.Current;
            }
        }

        public bool MoveNext()
        {
            return _e.MoveNext();
        }

        void IEnumerator.Reset()
        {
            _e.Reset();
        }

        void IDisposable.Dispose()
        {
        }
    }
}

Implement IEquatable<T> (RR0179)

• Syntax: class declaration, struct declaration, interface declaration
• Span: base list

Initialize field from constructor (RR0197)

• Syntax: field declaration
• Span: idenifier

Before

public class Foo
{
    private string _bar;

    public Foo()
    {
    }

    public Foo(object parameter)
    {
    }

    public Foo(object parameter1, object parameter2)
        : this(parameter1)
    {
    }
}

After

public class Foo
{
    private string _bar;

    public Foo(string bar)
    {
        _bar = bar;
    }

    public Foo(object parameter, string bar)
    {
        _bar = bar;
    }

    public Foo(object parameter1, object parameter2, string bar)
        : this(parameter1, bar)
    {
        _bar = bar;
    }
}

Initialize local with default value (RR0060)

• Syntax: local declaration without initializer
• Span: identifier

Inline alias expression (RR0061)

• Syntax: using alias directive
• Span: identifier

Inline constant (RR0181)

• Syntax: constant declaration

Inline constant value (RR0127)

• Syntax: expression that has constant value

Before

public const string Value = "x";

void Foo()
{
    string x = Value;
}

After

public const string Value = "x";

void Foo()
{
    string x = "x";
}

Inline method (RR0062)

• Syntax: method invocation

Inline property (RR0198)

• Syntax: property access

Inline using static (RR0180)

• Syntax: using static directive

Insert string interpolation (RR0063)

• Syntax: string literal, interpolated string

Introduce and initialize field (RR0064)

• Syntax: constructor parameter

Introduce and initialize property (RR0065)

• Syntax: constructor parameter

Introduce constructor (RR0066)

• Syntax: field, property

Introduce field to lock on (RR0067)

• Syntax: lock statement
• Span: missing expression

Introduce local variable (RR0068)

• Syntax: expression statement, expression in using statement

Invert binary expression (RR0079)

• Syntax: logical and/or expression

Invert boolean literal (RR0080)

• Syntax: boolean literal

Invert conditional expression (RR0160)

• Syntax: conditional expression
• Span: condition

Invert if (RR0189)

• Syntax: if statement
• Span: if keyword

Before

if (condition1)
{
    if (condition2)
    {
        Foo();
    }
}

After

if (!condition1)
{
    return;
}

if (!condition2)
{
    return;
}

Foo();

---

Before

if (!condition1)
{
    return;
}

if (!condition2)
{
    return;
}

Foo();

After

if (condition1)
{
    if (condition2)
    {
        Foo();
    }
}

Invert if-else (RR0162)

• Syntax: if-else statement
• Span: if keyword

Invert is expression (RR0081)

• Syntax: is expression
• Span: operator

Invert LINQ method call (RR0116)

• Syntax: System.Linq.Enumerable.Any(Func<T, bool>) or System.Linq.Enumerable.All(Func<T, bool>)
• Span: method name

Before

if (items.Any(predicate)
{
}

After

if (items.All(!predicate)
{
}

---

Before

if (items.All(predicate)
{
}

After

if (items.Any(!predicate)
{
}

Invert operator (RR0082)

• Syntax: !=, &&, ||, <, <=, ==, >, >=

Invert prefix/postfix unary operator (RR0134)

• Syntax: prefix/postfix unary expression
• Span: operator token

Before

int i = 0;

i++;

After

int i = 0;

i--;

---

Before

int i = 0;

++i;

After

int i = 0;

--i;

Join string expressions (RR0078)

• Syntax: concatenated string expressions

Make member abstract (RR0069)

• Syntax: non-abstract indexer/method/property in abstract class
• Span: indexer/method/property header

Make member virtual (RR0070)

• Syntax: method declaration, indexer declaration

Merge assignment expression with return statement (RR0073)

• Syntax: assignment expression followed with return statement

Merge attributes (RR0074)

• Syntax: selected attribute lists

Merge if statements (RR0075)

• Syntax: selected if statements

Before

bool condition1 = false;
bool condition2 = false;

if (condition1)
{
    return false;
}

if (condition2)
{
    return false;
}

return true;

After

bool condition1 = false;
bool condition2 = false;

if (condition1 || condition2)
{
    return false;
}

return true;

Merge if with parent if (RR0196)

• Syntax: if statement
• Span: if keyword

Before

if (x)
{
    if (y)
    {
    }
}
else
{
}

After

if (x && y)
{
}
else
{
}

Merge interpolation into interpolated string (RR0076)

• Syntax: interpolation

Merge local declarations (RR0077)

• Syntax: local declarations with same type

Move unsafe context to containing declaration (RR0202)

• Syntax: unsafe declaration
• Span: unsafe modifier

Before

public class Foo
{
  public unsafe void Bar()
  {
  }
}

After

public unsafe class Foo
{
  public void Bar()
  {
  }
}

Notify when property change (RR0083)

• Syntax: property in class/struct that implements System.ComponentModel.INotifyPropertyChanged
• Span: setter

Parenthesize expression (RR0084)

• Syntax: selected expression

Promote local to parameter (RR0085)

• Syntax: local declaration in method

Remove all comments (RR0086)

• Syntax: singleline/multiline comment, singleline/multiline documentation documentation comment

Remove all comments (except documentation comments) (RR0087)

• Syntax: singleline/multiline comment

Remove all documentation comments (RR0088)

• Syntax: singleline/multiline documentation comment

Remove all member declarations (RR0089)

• Syntax: namespace, class, struct, interface
• Span: opening or closing brace

Remove all preprocessor directives (RR0090)

• Syntax: preprocessor directive

Remove all region directives (RR0091)

• Syntax: region directive

Remove all statements (RR0092)

• Syntax: method, constructor, operator
• Span: opening or closing brace

Remove all switch sections (RR0093)

• Syntax: switch statement
• Span: opening or closing brace

Remove async/await (RR0209)

• Syntax: method declaration, local function, lambda, anonymous method
• Span: async keyword

Before

class C
{
    async Task<object> FooAsync()
    {
        return await BarAsync().ConfigureAwait(false);
    }
}

After

class C
{
    Task<object> FooAsync()
    {
        return BarAsync();
    }
}

Remove braces (RR0094)

• Syntax: do statement, else clause, fixed statement, for statement, foreach statement, if statement, lock statement, using statement, while statement
• Span: block with a single statement

Remove braces from if-else (RR0095)

• Syntax: if-else chain
• Span: embedded statement

Remove braces from switch section (RR0096)

• Syntax: switch section
• Span: case or default keyword

Remove braces from switch sections (RR0097)

• Syntax: switch statement
• Span: case or default keyword

Remove comment (RR0098)

• Syntax: singleline/multiline comment, singleline/multiline xml documentation comment

Remove condition from last else clause (RR0099)

• Syntax: else clause
• Span: else keyword

Remove directive and related directives (RR0100)

• Syntax: preprocessor directive, region directive

Remove empty lines (RR0101)

• Syntax: selected lines

Remove enum member value(s) (RR0199)

• Syntax: selected enum member(s)

Before

public enum Foo
{
    One = 1,
    Two = 2,
    Three = 3
}

After

public enum Foo
{
    One,
    Two,
    Three
}

Remove interpolation (RR0102)

• Syntax: string interpolation
• Span: opening or closing brace

Remove member (RR0103)

• Syntax: method, constructor, property, indexer, operator, event, namespace, class, struct, interface
• Span: opening or closing brace

Remove member declarations above/below (RR0104)

• Syntax: empty line between member declarations

Remove parameter name from argument (RR0105)

• Syntax: selected argument(s)

Remove parentheses (RR0106)

• Syntax: parenthesized expression
• Span: opening or closing parenthesis

Remove property initializer (RR0107)

• Syntax: property initializer

Remove region (RR0108)

• Syntax: region directive

Remove statement (RR0109)

• Syntax: do statement, fixed statement, for statement, foreach statement, checked statement, if statement, lock statement, switch statement, try statement, unchecked statement, unsafe statement, using statement, while statement
• Span: open/close brace

Remove statements from switch sections (RR0110)

• Syntax: selected switch sections

Rename backing field according to property name (RR0111)

• Syntax: field identifier inside property declaration

Rename identifier according to type name (RR0112)

• Syntax: foreach statement, local/field/constant declaration
• Span: identifier

Rename method according to type name (RR0113)

• Syntax: method

Rename parameter according to its type name (RR0114)

• Syntax: parameter
• Span: parameter identifier

Rename property according to type name (RR0115)

• Syntax: property identifier

Replace as expression with cast expression (RR0117)

• Syntax: as expression

Replace cast expression with as expression (RR0118)

• Syntax: cast expression

Replace conditional expression with expression (RR0119)

• Syntax: conditional expression
• Span: selected true/false expression

Replace constant with field (RR0121)

• Syntax: constant declaration

Replace equals expression with string.Equals (RR0124)

• Syntax: equals expression, not equals expression
• Span: operator

Replace equals expression with string.IsNullOrEmpty (RR0125)

• Syntax: equals expression, not equals expression
• Span: operator

Replace equals expression with string.IsNullOrWhiteSpace (RR0126)

• Syntax: equals expression, not equals expression
• Span: operator

Replace interpolated string with interpolation expression (RR0135)

• Syntax: interpolated string with single interpolation and no text
• Span: interpolation

Replace method group with lambda (RR0137)

• Syntax: method group

Before

Func<object, object, object> func = Foo;

After

Func<object, object, object> func = (f, g) => Foo(f, g)

Replace method with property (RR0138)

• Syntax: method
• Span: method header

Replace null literal expression with default expression (RR0139)

• Syntax: argument

Replace object creation with default value (RR0185)

• Syntax: object creation expression

Before

var x = new object();

After

object x = null;

---

Before

var arr = new object[0];

After

object[] arr = null;

Replace prefix operator to postfix operator (RR0140)

• Syntax: prefix/postfix unary expression

Replace property with method (RR0141)

• Syntax: read-only property
• Span: property header

Reverse 'for' loop (RR0152)

• Syntax: for statement

Simplify if (RR0153)

• Syntax: if statement
• Span: top if keyword or selected if statement

Simplify lambda expression (RR0154)

• Syntax: lambda expression with block with single single-line statement
• Span: body

Sort case labels (RR0207)

• Syntax: selected case labels with string literal or enum field

Before

bool Foo(string s)
{
    switch (s)
    {
        case "d":
        case "b":
        case "a":
        case "c":
            return true;
        default:
            return false;
    }
}

After

bool Foo(string s)
{
    switch (s)
    {
        case "a":
        case "b":
        case "c":
        case "d":
            return true;
        default:
            return false;
    }
}

Sort member declarations (RR0155)

• Syntax: namespace declarations, class declarations, struct declarations, interface declarations, enum declarations
• Span: selected member declarations

Split attributes (RR0156)

• Syntax: selected attribute list

Split declaration and initialization (RR0194)

• Syntax: local variable declaration
• Span: equals token

Before

var s = GetValue();

After

string s;
s = GetValue();

Split if statement (RR0184)

• Syntax: if statement that has logical or expression as a condition
• Span: top if keyword or selected if statement

Split if-else (RR0190)

• Syntax: if statement
• Span: selected if statement or topmost if keyword

Before

if (condition1)
{
    return Foo1();
{
else if (condition2)
{
    return Foo2();
}
else
{
    return false;
}

After

if (condition1)
{
    return Foo1();
{

if (condition2)
{
    return Foo2();
}

return false;

Split switch labels (RR0157)

• Syntax: selected switch labels

Split variable declaration (RR0158)

• Syntax: local declaration, field declaration, event field declaration

Swap binary operands (RR0159)

• Syntax: binary expression
• Span: binary operator

Before

if (x && y)
{
{

After

if (y && x)
{
{

Swap member declarations (RR0161)

• Syntax: empty line between member declarations

Uncomment multi-line comment (RR0200)

• Syntax: multi-line comment

Before

/*string s = null;*/

After

string s = null;

Uncomment single-line comment (RR0163)

• Syntax: single-line comment(s)

Use "" instead of string.Empty (RR0168)

• Syntax: string.Empty field

Use bitwise operation instead of calling 'HasFlag' (RR0164)

• Syntax: Enum.HasFlag method invocation

Use C# 6.0 dictionary initializer (RR0191)

• Syntax: collection initializer

Before

var dic = new Dictionary<int, string>() { { 0, "0" } };

After

var dic = new Dictionary<int, string>() { [0] = "0" };

Use coalesce expression instead of if (RR0165)

• Syntax: if statement
• Span: top if keyword or selected if statement

Use constant instead of field (RR0128)

• Syntax: read-only field

Use element access instead of 'First/Last'ElementAt' method (RR0167)

• Syntax: First/Last/ElementAt method invocation
• Span: method name

Use enumerator explicitly (RR0206)

• Syntax: foreach statement
• Span: foreach keyword

Before

foreach (var item in items)
{
    yield return item;
}

After

using (var en = items.GetEnumerator())
{
    while (en.MoveNext())
    {
        yield return item;
    }
}

Use expression-bodied member (RR0169)

• Syntax: method, property, indexer, operator
• Span: body or accessor list

Use lambda expression instead of anonymous method (RR0170)

• Syntax: anonymous method
• Span: delegate keyword

Use List<T> instead of yield (RR0183)

• Syntax: yield return, yield break

Use StringBuilder instead of concatenation (RR0182)

• Syntax: string concatenation

Wrap in #if directive (RR0174)

• Syntax: selected lines

Wrap in condition (RR0172)

• Syntax: selected statements

Wrap in else clause (RR0173)

• Syntax: statement

Wrap in region (RR0175)

• Syntax: selected lines

Wrap in try-catch (RR0176)

• Syntax: selected statements

Wrap in using statement (RR0177)

• Syntax: local declaration of type that implements IDisposable

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