public (char letter, int number) GetFieldCoordinates()
{
var letter = FieldEnum.ToString()[0];
var number = int.Parse(FieldEnum.ToString()[1].ToString());
return(letter, number);
}
/// <summary>
/// Getting simple predicate
/// </summary>
/// <param name="field">Predicate entity field</param>
/// <param name="fieldValue">Predicate field value</param>
/// <param name="operation">Predicate operation</param>
/// <returns>Predicate</returns>
public virtual Expression <Func <T, bool> > GetPredicate(FieldEnum field, object fieldValue, OperationEnum operation)
{
var parameter = Expression.Parameter(typeof(T), "x");
var property = Expression.Property(parameter, field.ToString());
var constantValue = GetConstantValue(fieldValue, property, operation);
var expression = GetOperationExpression(operation, property, constantValue);
var lambda = Expression.Lambda <Func <T, bool> >(expression, parameter);
return(lambda);
}
/// <summary>
/// Getting null-predicate
/// </summary>
/// <param name="field">Predicate field</param>
/// <param name="fieldType">Predicate field type</param>
/// <returns>Null-predicate</returns>
public virtual Expression <Func <T, bool> > GetNullPredicate(FieldEnum field, Type fieldType)
{
var parameter = Expression.Parameter(typeof(T), "x");
var property = Expression.Property(parameter, field.ToString());
var constantValue = Expression.Constant(null, fieldType);
var expression = Expression.Equal(property, constantValue);
var lambda = Expression.Lambda <Func <T, bool> >(expression, parameter);
return(lambda);
}
private static string SimpleValueExtractor(IStatisticalUnit unit, FieldEnum field)
{
return(unit.GetType().GetProperty(field.ToString())?.GetValue(unit, null)?.ToString() ?? string.Empty);
}