Develop Reference

Parse string to different variables c#

I've got a string fdf=232232&lid=19974832&number=1&aa_result1_1=someId1&aa_resuuuuuult2_2=someId2&aa_resuuuult3_3=someId3
and if aa exists I need to take values and add them to dictionary like:
var dict = extendedIds.Add("result1", new Dictionary<string, int[]>()
{
{
"someId1",
new int[]{ 1 }
}, ...
});
however I am having a difficult time deciding how to parse it properly? I need to accept multiple aa values (the ones that come as resultN, someIdN and a number (which is the number after resultN_NUMBER).
I tried to use substring but that doesn't work as I dont't now the length of word result
Basically it is
var parameters = $"pam=805700&laaid=19974832&kpm=1&{HttpUtility.UrlEncode("aa_{result}_{number}={id}&aa_{result}_{number}={id}&aa_{result}_{number}={id}", Encoding.UTF8)}";
So I decode it and get string:
var decoded = input.ToString().UrlDecode();
I need to accept multiple aa values, so in this example there would be three values, two of them comes from in bertween _ one after = but I wonder how to take these values then there could be something else also split by _...
also I could var parsed = HttpUtility.ParseQueryString(decoded); parse to NameValueCollection. but I can't use parsed.GetValues("aa") because the key would be e.g. aa_result1_1 and I never know beforehand what it is

this is a query string, you can use HttpUtility.ParseQueryString to parse it
see
https://learn.microsoft.com/en-us/dotnet/api/system.web.httputility.parsequerystring?view=net-5.0

Would this set you on the right track?
var qs = "fdf=232232&lid=19974832&number=1&aa_result1_1=someId1&aa_resuuuuuult2_2=someId2&aa_resuuuult3_3=someId3";
var nvc = System.Web.HttpUtility.ParseQueryString(qs);
foreach (var key in nvc.AllKeys.Where(k => k.StartsWith("aa")))
{
var id = nvc[key];
var parts = key.Split('_');
var result = parts[1];
var number = parts[2];
Console.WriteLine($"result = '{result}', number = '{number}' => id = '{id}'");
}
Use ParseQueryString to convert your string into a NameValueCollection.
Then use each key that starts with "aa"
Get its value - this is your "id"
Split the key on the _
Ignore the first part (which would be "aa") and use the next two parts
Of course you would want to add some safety: I now assume that there always are 3 parts in that key. Plus you want to do something useful with the results.
The above code prints this
result = 'result1', number = '1' => id = 'someId1'
result = 'resuuuuuult2', number = '2' => id = 'someId2'
result = 'resuuuult3', number = '3' => id = 'someId3'

Get everything after Slash c#

I'm trying to figure out the best way to get everything before the / character in a string. Some example strings are below.
var url = dr.FindElements(By.XPath("//*[#id=\"u_0_3\"]/div/h1/a"));
foreach (var item in url)
{
if (item.GetAttribute("href").ToString().Contains("https://www.facebook.com/"))
{
listBox4.Items.Add("here");
}
}
the href is like that = "http://facebook.com/xxx"
want the xxx which is username want to get it alone in my listbox without the rest of the url

If you're at the point where you've got the string you want to work with, here are two ways to do this:
Split the string by / and take the last part
var stringToProcess = "https://www.facebook.com/ProfileName";
var partsOfString = stringToProcess.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
var profileName = partsOfString.Last();
Use the Uri class to extract the last part
var stringToProcess = "https://www.facebook.com/ProfileName";
var stringToProcessAsUri = new Uri(stringToProcess);
var profileNameFromUri = stringToProcessAsUri.Segments.Last();
This is the "strictly better" way as it will give you a clean result even if the profile address has a query string attached to it, i.e:
var stringToProcess = "https://www.facebook.com/ProfileName?abc=def";
var stringToProcessAsUri = new Uri(stringToProcess);
var profileNameFromUri = stringToProcessAsUri.Segments.Last();
You'll still have the variable profileNameFromUri returned containing only ProfileName

Extract a substring from a string in C#

How can I extract the substring "John Woo" from the below string in C#
CN=John Woo,OU=IT,OU=HO,DC=ABC,DC=com
Thanks !

You could use a Lookup<TKey, TElement>:
string text = "CN=John Woo,OU=IT,OU=HO,DC=ABC,DC=com";
var keyValues = text.Split(',')
.Select(s => s.Split('='))
.ToLookup(kv => kv[0], kv => kv.Last());
string cn = keyValues["CN"].FirstOrDefault(); // John Woo
// or, if multiple values with the same key are allowed (as suggested in the given string)
string dc = string.Join(",", keyValues["DC"]); // ABC,com
Note that you neither get an exception if the key is not present(as in a dictionary) nor if the key is not uniqe (as in a dictionary). The value is a IEnumerable<TElement>.

Try this
var regex = new Regex("CN=(?<mygroup>.*?),");
var match = regex.Match("CN=John Woo,OU=IT,OU=HO,DC=ABC,DC=com");
if(match.Success)
{
string result = match.Groups["mygroup"].Value;
}

Try this (this is a non generic answer) :
var name = str.Split(',').Where(n => n.StartsWith("CN=")).FirstOrDefault().Substring(3);

Something like this
var s = "CN=John Woo,OU=IT,OU=HO,DC=ABC,DC=com";
// this give you a enumarable of anonymous key/value
var v = s.Split(',')
.Select(x => x.Split('='))
.Select(x => new
{
key = x[0],
value = x[1],
});
var name = v.First().value; // John Woo

You can firstly split the string by the commas to get an array of strings, each of which is a name/value pair separated by =:
string input = "CN=John Woo,OU=IT,OU=HO,DC=ABC,DC=com";
var nameValuePairs = input.Split(new[] {','});
Then you can split the first name/value pair like so:
var nameValuePair = nameValuePairs[0].Split(new[]{'='});
Finally, the value part will be nameValuePair[1]:
var value = nameValuePair[1];
(No error handling shown above - you would of course have to add some.)

I created the below code of my own and finally got the substring I needed. The below code works for every substring that I want to extract that falls after "CN=" and before first occurrence of ",".
string name = "CN=John Woo,OU=IT,OU=HO,DC=ABC,DC=com";
int index1 = name.IndexOf("=") + 1;
int index2 = name.IndexOf(",") - 3;
string managerName = name.Substring(index1, index2);
The Result was "John Woo"
Thanks all for your help...

How to get last file that not contain specific string

I know how to get the last file, this the code:
string pattern = "Log*.xml";
string directory = set. Path;
var dirInfo = new DirectoryInfo(directory);
var file = (from f in dirInfo.GetFiles(pattern) orderby f.LastWriteTime descending select f).First();
My question is: How can I get the last file that not contain specific string? or in another words, how can I get the last file that not contain "This is temporally file" string?
Thank you!

from top of my head:
dirInfo.EnumerateFiles(pattern)
.OrderByDescending(f => f.LastWriteTime)
.Where(f => DoesntContain(f, myText))
.FirstOrDefault()
Now you are free to make DoesntContain as complex or simple as you want. Either use File.ReadAllText or something like:
bool DoesntContain(FileInfo fileInfo, string text) {
using (StreamReader r = fileInfo.OpenText()) {
var contents = r.ReadToEnd();
return !contents.Contains(text);
}
}
You can write the method as extension to get more natural syntax like fi.DoesntContain(...)
Additionally, I suggest using EnumerateFiles instead of GetFiles if the directory can contain many files: there is no need to retrieve them all, if the first one will match.

You can do something like this:
string pattern = "Log*.xml";
var dirInfo = new DirectoryInfo(directory);
var filesThatContains = dirInfo.GetFiles(pattern).
Where(f=>File.ReadAllLines(Path.Combine(directory, f.Name),
Encofing.UTF8).IndexOf(SEARCH_STRING)>=0);

I would do something simpler for a start:
public static string[] FileNamesExcluding(string path, string pattern, string textToExclude)
{
// Put all txt files in root directory into array.
string[] allFilesMatchingPattern = Directory.GetFiles(path, pattern); // <-- Case-insensitive
return allFilesMatchingPattern.SkipWhile(a => a.Contains(textToExclude)).ToArray();
}
To call this method you can do:
FileNamesExcluding(#"C:\", "*.sys", "config").Last();

Reading Text file with Linq with 2 patterns

I need to read a text file like this
MyItemName = Description # MoreInfo
Now I need to convert this 3 fields in to a table. using the '=' and '#' as pattern.

Just splitting on = and # - this returns and IEnumerable of an anonymous class with the properties you are interested in:
var items = File.ReadAllLines(fileName)
.Skip(1) //Skip header
.Where( line => !string.IsNullOrWhiteSpace(line))
.Select(line =>
{
var columns = line.Split('=', '#');
return new
{
ItemName = columns[0].Trim(),
Description = columns[1].Trim(),
MoreInfo = columns[2].Trim()
};
});
This approach would require the separator tokens to be used as separators exclusively - if they do occur in any of the fields, this will mess up everything and void this approach.

if you really want to use linq for it...
It doesn't look very nice and it doesn't create a table, but you get the point:
from line in File.ReadAllLines(filename)
let eqPos = line.IndexOf('=')
let atPos = line.IndexOf('#')
select new {
Name = line.Substring(0, eqPos).Trim(),
Desc = line.Substring(eqPos + 1, atPos - (eqPos + 1)).Trim(),
Info = line.Substring(atPos + 1).Trim()
}