private TemplateBinder CreateTemplateBinder(RouteEndpoint endpoint)
{
// Now create the constraints and parameter transformers from the pattern
var policies = new List <(string parameterName, IParameterPolicy policy)>();
foreach (var kvp in endpoint.RoutePattern.ParameterPolicies)
{
var parameterName = kvp.Key;
// It's possible that we don't have an actual route parameter, we need to support that case.
var parameter = endpoint.RoutePattern.GetParameter(parameterName);
// Use the first parameter transformer per parameter
var foundTransformer = false;
for (var i = 0; i < kvp.Value.Count; i++)
{
var parameterPolicy = _parameterPolicyFactory.Create(parameter, kvp.Value[i]);
if (!foundTransformer && parameterPolicy is IOutboundParameterTransformer parameterTransformer)
{
policies.Add((parameterName, parameterTransformer));
foundTransformer = true;
}
if (parameterPolicy is IRouteConstraint constraint)
{
policies.Add((parameterName, constraint));
}
}
}
return(new TemplateBinder(
UrlEncoder.Default,
_uriBuildingContextPool,
endpoint.RoutePattern,
new RouteValueDictionary(endpoint.RoutePattern.Defaults),
endpoint.RoutePattern.RequiredValues.Keys,
policies));
}
// Internal for testing internal TemplateBinder GetTemplateBinder(RouteEndpoint endpoint) => _cache.EnsureInitialized().GetOrAdd(endpoint, _createTemplateBinder);
