public static ComandoSql <T> OrderBy <T>(this ComandoSql <T> comando, Expression <Func <T, object> > pred, bool desc = false)
{
var member = pred.Body as MemberExpression ?? (pred.Body as UnaryExpression)?.Operand as MemberExpression;
var prop = member?.Member as PropertyInfo;
var nombreProp = (prop?.GetCustomAttribute(typeof(Columna)) as Columna)?.Nombre ?? prop?.Name ?? "";
comando.OrderByText = $"{nombreProp} {(desc ? "DESC" : string.Empty)}";
return(comando);
}
public static ComandoSql <T> OrderBy <T>(this ComandoSql <T> comando, Expression <Func <T, object> > pred1, Expression <Func <T, object> > pred2, bool desc1 = false, bool desc2 = false)
{
var member1 = pred1.Body as MemberExpression ?? (pred1.Body as UnaryExpression)?.Operand as MemberExpression;
var member2 = pred2.Body as MemberExpression ?? (pred2.Body as UnaryExpression)?.Operand as MemberExpression;
var prop1 = member1?.Member as PropertyInfo;
var nombreProp1 = (prop1?.GetCustomAttribute(typeof(Columna)) as Columna)?.Nombre ?? prop1?.Name ?? "";
var prop2 = member2?.Member as PropertyInfo;
var nombreProp2 = (prop2?.GetCustomAttribute(typeof(Columna)) as Columna)?.Nombre ?? prop2?.Name ?? "";
comando.OrderByText = $"{nombreProp1} {(desc1 ? "DESC" : string.Empty)}, {nombreProp2} {(desc2 ? "DESC" : string.Empty)};";
return(comando);
}
public static ComandoSql <T> Where <T>(this ComandoSql <T> comando, Expression <Func <T, bool> > pred)
{
var member = pred.Body as BinaryExpression;
var tipo = typeof(T);
var campos = pred.ToString().Split(new string[] { "=>" }, StringSplitOptions.None);
var lambda = $"{campos[0].Trim()}.";
var resultado = campos[1].Trim().Replace(".Contains", " LIKE ");
var props = resultado.Split(' ');
foreach (var p in props)
{
var s = p.Replace("(", "").Replace(")", "");
if (s.StartsWith(lambda))
{
var propiedad = tipo.GetProperty(s.Substring(lambda.Length));
var nombreProp = (propiedad?.GetCustomAttribute(typeof(Columna)) as Columna)?.Nombre ?? propiedad?.Name ?? "";
resultado = resultado.Replace($"{lambda}{propiedad?.Name}", $"{nombreProp}");
}
}
resultado = resultado.Replace("AndAlso", "AND").Replace("OrElse", "OR").Replace("==", "=").Replace("!=", "<>").Replace("\"", "'");
comando.WhereText = resultado;
return(comando);
}
