protected virtual async Task<ActionDescriptor> SelectBestCandidate(
RouteContext context,
List<ActionDescriptor> candidates)
{
var applicableCandiates = new List<ActionDescriptorCandidate>();
foreach (var action in candidates)
{
var isApplicable = true;
var candidate = new ActionDescriptorCandidate()
{
Action = action,
};
var actionContext = new ActionContext(context, action);
var actionBindingContext = await _bindingProvider.GetActionBindingContextAsync(actionContext);
foreach (var parameter in action.Parameters.Where(p => p.ParameterBindingInfo != null))
{
if (!ValueProviderResult.CanConvertFromString(parameter.ParameterBindingInfo.ParameterType))
{
continue;
}
if (await actionBindingContext.ValueProvider.ContainsPrefixAsync(
parameter.ParameterBindingInfo.Prefix))
{
candidate.FoundParameters++;
if (parameter.IsOptional)
{
candidate.FoundOptionalParameters++;
}
}
else if (!parameter.IsOptional)
{
isApplicable = false;
break;
}
}
if (isApplicable)
{
applicableCandiates.Add(candidate);
}
}
if (applicableCandiates.Count == 0)
{
return null;
}
var mostParametersSatisfied =
applicableCandiates
.GroupBy(c => c.FoundParameters)
.OrderByDescending(g => g.Key)
.First();
var fewestOptionalParameters =
mostParametersSatisfied
.GroupBy(c => c.FoundOptionalParameters)
.OrderBy(g => g.Key).First()
.ToArray();
if (fewestOptionalParameters.Length > 1)
{
throw new InvalidOperationException("The actions are ambiguious.");
}
return fewestOptionalParameters[0].Action;
}
protected virtual async Task <ActionDescriptor> SelectBestCandidate(
RouteContext context,
List <ActionDescriptor> candidates)
{
var applicableCandiates = new List <ActionDescriptorCandidate>();
foreach (var action in candidates)
{
var isApplicable = true;
var candidate = new ActionDescriptorCandidate()
{
Action = action,
};
var actionContext = new ActionContext(context, action);
var actionBindingContext = await _bindingProvider.GetActionBindingContextAsync(actionContext);
foreach (var parameter in action.Parameters.Where(p => p.ParameterBindingInfo != null))
{
if (!ValueProviderResult.CanConvertFromString(parameter.ParameterBindingInfo.ParameterType))
{
continue;
}
if (await actionBindingContext.ValueProvider.ContainsPrefixAsync(
parameter.ParameterBindingInfo.Prefix))
{
candidate.FoundParameters++;
if (parameter.IsOptional)
{
candidate.FoundOptionalParameters++;
}
}
else if (!parameter.IsOptional)
{
isApplicable = false;
break;
}
}
if (isApplicable)
{
applicableCandiates.Add(candidate);
}
}
if (applicableCandiates.Count == 0)
{
return(null);
}
var mostParametersSatisfied =
applicableCandiates
.GroupBy(c => c.FoundParameters)
.OrderByDescending(g => g.Key)
.First();
var fewestOptionalParameters =
mostParametersSatisfied
.GroupBy(c => c.FoundOptionalParameters)
.OrderBy(g => g.Key).First()
.ToArray();
if (fewestOptionalParameters.Length > 1)
{
throw new InvalidOperationException("The actions are ambiguious.");
}
return(fewestOptionalParameters[0].Action);
}
