ASP.NET Core default Route Constraints list

ConstraintsList.md

ASP.NET Core default Route Constraints list

Constraints for Checking Data Type

The following Constrains checks the data type :

Constraint	Inline	Class	Description
int	{id:int}	IntRouteConstraint	Constrains a route parameter to represent only 32-bit integer values
alpha	{id:alpha}	AlphaRouteConstraint	Constrains a route parameter to contain only lowercase or uppercase letters A through Z in the English alphabet.
bool	{id:bool}	BoolRouteConstraint	Constrains a route parameter to represent only Boolean values.
datetime	{id:datetime}	DateTimeRouteConstraint	Constrains a route parameter to represent only DateTime values.
decimal	{id:decimal}	DecimalRouteConstraint	Constrains a route parameter to represent only decimal values.
double	{id:double}	DoubleRouteConstraint	Constrains a route parameter to represent only 64-bit floating-point values.
float	{id:float}	FloatRouteConstraint	Matches a valid float value (in the invariant culture - see warning)
guid	{id:guid}	GuidRouteConstraint	Matches a valid Guid value

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Constraints for Checking Data Value/Range/Length

The following Constrains checks the Value/Range/Length etc :

Constraint	Inline	Class	Description
length(length)	{id:length(12)}	LengthRouteConstraint	Constrains a route parameter to be a string of a given length or within a given range of lengths.
maxlength(value)	{id:maxlength(8)}	MaxLengthRouteConstraint	Constrains a route parameter to be a string with a maximum length.
minlength(value)	{id:minlength(4)}	MinLengthRouteConstraint	Constrains a route parameter to be a string with a maximum length.
range(min,max)	{id:range(18,120)}	RangeRouteConstraint	Constraints a route parameter to be an integer within a given range of values.
min(value)	{id:min(18)}	MinRouteConstraint	Constrains a route parameter to be a long with a minimum value.
max(value)	{id:max(120)}	MaxRouteConstraint	Constrains a route parameter to be an integer with a maximum value.

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Constraints using a Regular Expression

Using Regular expression or regex as constraint offers more flexibility to limit any input :

Constraint	Inline	Class	Description
regex(expression)	{ssn:regex(^\\d{{3}}-\\d{{2}}-\\d{{4}}$)}	RegexRouteConstraint	Constrains a route parameter to match a regular expression.