private object TryGetArg(IHttpContext context, ParameterInfo param, IDictionary<string, string> urlArgs,
IDictionary<string, string> routeArgs, IQueryValidator argResolver)
{
var type = param.ParameterType;
if (type == typeof(IHttpContext))
return context;
var paramName = param.Name.ToLower();
string argValue;
var gotValue = urlArgs.TryGetValue(paramName, out argValue)
|| (routeArgs != null && routeArgs.TryGetValue(paramName, out argValue));
if (!gotValue)
{
object defaultValue;
if (param.TryGetDefaultValue(out defaultValue))
return defaultValue;
if (Nullable.GetUnderlyingType(param.ParameterType) != null)
return null;
return Error(context, "Missing param '{0}'", paramName);
}
if (string.IsNullOrEmpty(argValue))
return Error(context, "Empty param '{0}'", paramName);
object parsedArg;
if (!m_argParser.TryParse(type, argValue, out parsedArg))
return Error(context, "Param '{0}' is invalid", paramName);
return parsedArg;
}