public SendGridBinding(ParameterInfo parameter, SendGridAttribute attribute, SendGridConfiguration config, BindingProviderContext context)
{
_parameter = parameter;
_attribute = attribute;
_config = config;
_sendGrid = new Web(_config.ApiKey);
if (!string.IsNullOrEmpty(_attribute.To))
{
_toFieldBinding = new BindablePath(_attribute.To);
_toFieldBinding.ValidateContractCompatibility(context.BindingDataContract);
}
if (!string.IsNullOrEmpty(_attribute.Subject))
{
_subjectFieldBinding = new BindablePath(_attribute.Subject);
_subjectFieldBinding.ValidateContractCompatibility(context.BindingDataContract);
}
if (!string.IsNullOrEmpty(_attribute.Text))
{
_textFieldBinding = new BindablePath(_attribute.Text);
_textFieldBinding.ValidateContractCompatibility(context.BindingDataContract);
}
}
private static bool CanBind(BindingProviderContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
// first, verify the file path binding (if it contains binding parameters)
ParameterInfo parameter = context.Parameter;
FileAttribute attribute = parameter.GetCustomAttribute<FileAttribute>(inherit: false);
BindablePath path = new BindablePath(attribute.Path);
path.ValidateContractCompatibility(context.BindingDataContract);
// next, verify that the type is one of the types we support
IEnumerable<Type> types = StreamValueBinder.SupportedTypes.Union(new Type[] { typeof(FileStream) });
return ValueBinder.MatchParameterType(parameter, types);
}
public Task<IValueProvider> BindAsync(BindingContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
FileInfo fileInfo = null;
if (context != null)
{
BindablePath path = new BindablePath(_attribute.Path);
string boundFileName = path.Bind(context.BindingData);
string filePath = Path.Combine(_config.RootPath, boundFileName);
fileInfo = new FileInfo(filePath);
}
return BindAsync(fileInfo, context.ValueContext);
}