public Task TryCreateAsync()

in src/WebJobs.Extensions/Extensions/Files/Bindings/FileAttributeBindingProvider.cs [40:73]

• 28 lines of code
• 5 McCabe index (conditional complexity)

        public Task<IBinding> TryCreateAsync(BindingProviderContext context)
        {
            if (context == null)
            {
                throw new ArgumentNullException("context");
            }

            // Determine whether we should bind to the current parameter
            ParameterInfo parameter = context.Parameter;
            FileAttribute attribute = parameter.GetCustomAttribute<FileAttribute>(inherit: false);
            if (attribute == null)
            {
                return Task.FromResult<IBinding>(null);
            }

            // first, verify the file path binding (if it contains binding parameters)
            string path = attribute.Path;
            if (_nameResolver != null)
            {
                path = _nameResolver.ResolveWholeString(path);
            }
            BindingTemplate bindingTemplate = BindingTemplate.FromString(path);
            bindingTemplate.ValidateContractCompatibility(context.BindingDataContract);

            IEnumerable<Type> types = StreamValueBinder.GetSupportedTypes(attribute.Access)
                .Union(new Type[] { typeof(FileStream), typeof(FileInfo) });
            if (!ValueBinder.MatchParameterType(context.Parameter, types))
            {
                throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture,
                    "Can't bind FileAttribute to type '{0}'.", parameter.ParameterType));
            }

            return Task.FromResult<IBinding>(new FileBinding(_options, parameter, bindingTemplate));
        }