public override IParameterPolicy Create(RoutePatternParameterPart?parameter, string inlineText)
{
if (inlineText == null)
{
throw new ArgumentNullException(nameof(inlineText));
}
var parameterPolicy = ParameterPolicyActivator.ResolveParameterPolicy <IParameterPolicy>(
_options.ConstraintMap,
_serviceProvider,
inlineText,
out var parameterPolicyKey);
if (parameterPolicy == null)
{
throw new InvalidOperationException(Resources.FormatRoutePattern_ConstraintReferenceNotFound(
parameterPolicyKey,
typeof(RouteOptions),
nameof(RouteOptions.ConstraintMap)));
}
if (parameterPolicy is IRouteConstraint constraint)
{
return(InitializeRouteConstraint(parameter?.IsOptional ?? false, constraint));
}
return(parameterPolicy);
}
/// <inheritdoc />
/// <example>
/// A typical constraint looks like the following
/// "exampleConstraint(arg1, arg2, 12)".
/// Here if the type registered for exampleConstraint has a single constructor with one argument,
/// The entire string "arg1, arg2, 12" will be treated as a single argument.
/// In all other cases arguments are split at comma.
/// </example>
public virtual IRouteConstraint ResolveConstraint(string inlineConstraint)
{
if (inlineConstraint == null)
{
throw new ArgumentNullException(nameof(inlineConstraint));
}
// This will return null if the text resolves to a non-IRouteConstraint
return(ParameterPolicyActivator.ResolveParameterPolicy <IRouteConstraint>(
_inlineConstraintMap,
_serviceProvider,
inlineConstraint,
out _));
}