I have this annotation in my model
[ZoneamentoDados(fim = 2, inicio = 1, tamanho = 2, obs = "Tipo Registro")]
public String tipoRegistro { get; set; }
[ZoneamentoDados(fim = 54, inicio = 54, tamanho = 1, obs = "Sempre 1")]
I need to use the end, start, and size values to separate substring and controller . Can anyone tell me how I could use these annotations in controller or indicate some link to understand better?
In this case you will have to work with the famous Reflection .
For this, you will need to read the selected property and return the desired value.
An example would look something like this:
public static int ObterValorInicio<T>(Expression<Func<T>> expr)
{
var mexpr = expr.Body as MemberExpression;
if (mexpr == null) return 0;
if (mexpr.Member == null) return 0;
//Busco o CustomAttribute ZoneamentoDados
object[] attrs = mexpr.Member.GetCustomAttributes(typeof(ZoneamentoDados), false);
if (attrs == null || attrs.Length == 0) return 0;
//Seleciono o primeiro valor
ZoneamentoDados desc = attrs[0] as ZoneamentoDados;
if (desc == null) return 0;
//Obtém o valor Inicio. Para obter outros valores, basta alterar, ex: return desc.Tamanho;
return desc.Inicio;
}
In this example I look for a custom attribute called ZoneamentoDados and return the values. If I find the value, I return the value corresponding to the desired property.
See the full .NETFiddle here
Below are some references for better understanding: