private IQueryable <T> AddCriteria <T>(IQueryable <T> dbSet, QueryCriteriaDto criteria) where T : BaseModel
{
var parameter = Expression.Parameter(typeof(T), "x");
var property = Expression.PropertyOrField(parameter, criteria.Property);
var left = property;
var rigth = Expression.Constant(criteria.Value);
BinaryExpression whereBody;
if (criteria.Operator == Operators.EQUAL)
{
whereBody = Expression.Equal(left, rigth);
}
else if (criteria.Operator == Operators.GRATER_THAN_OR_EQUAL)
{
whereBody = Expression.GreaterThanOrEqual(left, rigth);
}
else if (criteria.Operator == Operators.LESS_THAN_OR_EQUAL)
{
whereBody = Expression.LessThanOrEqual(left, rigth);
}
else if (criteria.Operator == Operators.NOT_EQUAL)
{
whereBody = Expression.NotEqual(left, rigth);
}
else
{
whereBody = Expression.Equal(left, rigth);
}
var whereLambda = Expression.Lambda <Func <T, bool> >(whereBody, parameter);
var whereCallExpression = Expression.Call(
typeof(IQueryable),
"Where",
new[] { typeof(T) },
dbSet.Expression,
whereLambda
);
return(dbSet.Provider.CreateQuery <T>(whereCallExpression));
}
private IQueryable <T> AddCriteria <T>(T _, IQueryable <T> dbSet, QueryCriteriaDto criteria) where T : BaseModel
{
return(AddCriteria(dbSet, criteria));
}
