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SA1121: UseBuiltInTypeAlias

Glossary Item Box

TypeName	UseBuiltInTypeAlias
CheckId	SA1121
Category	Readability Rules

Cause

The code uses one of the basic C# types, but does not use the built-in alias for the type.

Rule Description

A violation of this rule occurs when one of the following types are used anywhere in the code: Array, Boolean, Byte, Char, Decimal, Double, Int16, Int32, Int64, Object, SByte, Single, String, UInt16, UInt32, UInt64.

A violation also occurs when any of these types are represented in the code using the full namespace for the type: System.Array, System.Boolean, System.Byte, System.Char, System.Decimal, System.Double, System.Int16, System.Int32, System.Int64, System.Object, System.SByte, System.Single, System.String, System.UInt16, System.UInt32, System.UInt64.

Rather than using the type name or the fully-qualified type name, the built-in aliases for these types should always be used: array, bool, byte, char, decimal, double, short, int, long, object, sbyte, single, string, ushort, uint, ulong.

The following table lists each of these types in all three formats:

Type Alias	Type	Fully Qualified Type
array	Array	System.Array
bool	Boolean	System.Boolean
byte	Byte	System.Byte
char	Char	System.Char
decimal	Decimal	System.Decimal
double	Double	System.Double
short	Int16	System.Int16
int	Int32	System.Int32
long	Int64	System.Int64
object	Object	System.Object
sbyte	SByte	System.SByte
single	Single	System.Single
string	String	System.String
ushort	UInt16	System.UInt16
uint	UInt32	System.UInt32
ulong	UInt64	System.UInt64

How to Fix Violations

To fix a violation of this rule, replace the type with the built-in alias for the type.