Are there any disadvantages or performance slowdowns related to the use of expressions like
from i in Enumerable.Range(1, Math.Min(strTexto.Length, tamMax) + 1)select Tuple.Create(strTexto.Substring(0, i - 1), strTexto.Substring(i - 1))in C#? Is it preferable to build "hard-coded queries" like
foreach (Int32 IntTmp in SomeListWithTheRange)SomeListWithTheTuples.Add(new Tuple<String, String> (strTexto.Substring(0, i - 1), strTexto.Substring(i - 1)))?
While the first one seems more readable at first glance, I have noticed that this kind of queries can get very slow... For instance, the first query takes 11ms to perform, while the second one takes only 1ms. Am I right? Just want to make sure since I need to implement lots of these kind of queries.
Best Answer
The first approach will perform just as well as the second. When you say that you "have noticed that this kind of queries can get very slow" - could you provide more details? You can certainly write slow LINQ queries, but that's a matter of using LINQ appropriately.
Note that your two code samples aren't equivalent at the moment at all - the first just builds a query, but doesn't use it at all. Your second seems to be calling Concat repeatedly, which will be slow when you iterate over it, as you'll end up with an awful lot of iterators.
If you could explain what you're actually trying to do, that would help a lot.
The Select clause in C# is used to retrieve specific data from a given source. It allows you to specify which properties or columns you want to include in the result set. This can be useful when you only need certain fields and don't want to retrieve all the data. To use the Select clause, you need to specify the source, followed by the keyword 'Select' and then the properties or columns you want to include.
For example, if you have a list of objects and you only want to retrieve the names of those objects, you can use the Select clause like this:
List<Person> people = new List<Person>();var names = people.Select(p => p.Name);This will create a new list called 'names' that contains only the names of the people in the original list.
The Select clause can also be used with LINQ queries to retrieve specific data from a database. It allows you to select specific columns from a table or join multiple tables to retrieve the desired data.
In conclusion, the Select clause in C# is a powerful tool for retrieving specific data from a given source. It allows you to specify which properties or columns you want to include in the result set, making your code more efficient and concise.