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Closed 9 years ago.
Say I have strings like these
Sam is Boy
Joseph is Boy
Jasmine is Girl
Annie is Girl
Chris is Boy
I have a quick and murky way of preparing a C# Dictionary like this..!
input.ForEach(i =>
{
string[] values = i.Split();
input_dictionary.Add(values[0], values[2]);
});
Do we have any other better/optimised way of achieving this, since the input data follows a fixed format like "Name is Gender"?
Here's a regex pattern you could use:
(.+) is (Boy|Girl)
The following is probably faster, but you should test it.
input_dictionary = (from i in input
let n = i.IndexOf(' is ')
select new { Name = i.Substring(0, n), Sex = i.Substring(n + 4) }
).ToDictionary(i => i.Name, i => i.Sex);
You can also the Regex class, which might be faster or slower than the above. It's difficult to say without testing.
Related
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Closed 9 years ago.
I am building a list from a dataset as 12345_9876,125675_0987,
I try to remove the last , from the list like we do for strings..
value.TrimEnd(',');
Can we do similar thing for a list?
I hope this will help you?
var lastElement = yourList.ElementAt<string>(yourList.Count - 1).TrimEnd(',');
yourList.RemoveAt(yourList.Count - 1);
yourList.Insert(yourList.Count,lastElement);
Think you just want this?:
List<string mylistfromdataset = // I dunno how you populated it
var newlist = mylistfromdataset.Select(x=> x.TrimEnd(',')).ToList();
EDIT after the poster cleared the question, you could use this 2 line code to make a new list where the last string the , is trimmed.
var list = listofstring.Take(listofstring.Count - 1).ToList();
list.Add(listofstring.Last().TrimEnd(','));
(Make a list excluding the last item. then trim the last item with , at the end and at it to the new list.)
Just use String.Join:
String delimitedList = String.Join(",", yourList);
int i=value.LastIndexOf(",");
if(i!=-1)
value=value.Remove(i,1);
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Closed 9 years ago.
I have an array of object called objStud within it has another array
how do I loop and display them?
Here is an image that you can see how objStud is like
Just use nested foreach statements
foreach (Student stud in objStud)
{
foreach (Fee in stud.Fees)
{
// Do something with stud and/or fee
}
}
You can use SelectMany to flatten first:
foreach(var fee in objStud.SelectMany(x => x.Fees))
{
}
You can use "foreach" in looping and displaying the values. This is a very easy and good example on how to access the data that you want to display.
This will also teach you the concept behind array. Have fun!
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Closed 9 years ago.
I am new to learning Regex and I am struggling with this basic issue. I want to make sure a string is in a format like: 2000/2001 or 2010/2011.
I tried something like: ^[2000-2900]./.[2000-2900]$ but I know this is wrong!
This would be the very basic:
^\d{4}\/\d{4}$
From the beginning of the string, check if it has 4 digits followed by a "/" (escaped with "\") and another 4 digits to the end of the string.
If you searching for where the entire string must match then:
^\d{4}/\d{4}$
If you are searching for a sub string of a larger string then:
\d{4}/\d{4}
And if you using in C# then remember to wrap it up in a verbatim string like so:
#"^\d{4}/\d{4}$"
#"\d{4}/\d{4}"
I noticed that others are escaping the forward slash but I don't think is necessary but doesn't do any harm if you do.
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Closed 9 years ago.
I`m making an application for an animal shelter, and each time a dog is added to the animal list it has to have the date it last went for a walk. Part of the assignment is to show a list of dogs that are not walked out TODAY. Any ideas?
OK, assuming that you have a "LastWalked" column in your data structure you want something like:
var dogsNotWalked = allDogs.Where(d => d.LastWalked < DateTime.Today);
It would help if you'd try something before asking for help. Not to mention showing your work. It's not exactly difficult, a one-liner, in fact. Try something like this:
public IEnumerable<Dog> Dogs { get ; set ; }
public IEnumerable<Dog> FindDogsNotWalkedRecently( DateTime referenceDate )
{
return Dogs.Where( dog => dog.LastWalkedAt < referenceDate ) ;
}
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Closed 10 years ago.
first of all i know there is many topics talks about this case but not like i want
i want to get the words like Facebook do in mentions names in comments
here is my conditions
1- i want all words start with # char
2- i want all lonely # char
3- i don't want any words that contain '#' like any#hotmail.com
EX: "# this d#y #hmed #nd May# went to play # g#arden"
the result i want is
{"#" , "#hmed" ,"#nd" , "#"}
please notice the second condition i want
thanks
The regex should be /(?:^|\s)(#[^#\s]*)(?=\s|$)/g
[ test: http://ideone.com/1LK80 ]