Develop Reference

Trim string in c# output last string

I'm currently making a Game and I have already split the string everything right but how I can trim the string and output the last line or a line in the middle?
Code:
text = "Username:King100 ID:100 Level:10";
string[] splittext = text.Split(' ');
foreach (var texs in splittext)
{
Console.WriteLine(texs);
}
Output:
Username:King100
ID:100
Level:10
I just want display the level 10 in the Console how thats works?
thanxs for helping.
Edit: the level can be changed often like 10 or 100 or 1000

Regex is more flexible solution. But if your text format is contsant, you can use this simple way:
string level = text.Substring(text.LastIndexOf(':') + 1);

You can also use a Regular Expression to solve this:
var regex = new Regex(#"Level:(?<Level>\d*)");
var matches = regex.Matches("Username:King100 ID:100 Level:10");
if (matches.Count > 0 && matches[0].Success)
{
Console.WriteLine(matches[0].Groups["Level"].Value);
}

var text = "Username:King100 ID:100 Level:10";
/*
Splits the given string on spaces and then splits on ":"
and creates a Dictionary ("Dictionary<TKey, TValue>")
*/
var dict = text.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
.Select(part => part.Split(':'))
.ToDictionary(split => split[0], split => split[1]);
//If the dictionary count is greater than Zero
if(dict.Count > 0)
{
var levelValue = dict["Level"].ToString();
}

OK, because i'm annoying and totally bored of work, i decided to benchmark everyone's solutions.
The premise was simply to make an array of 1000 (scale) lines of strings (in the given format) with random positive int on the end;
Note : I made every solution int.Parse the result, as it seemed more useful
Mine
This just uses fixed, unsafe, pointers and no error checking
var level = 0;
fixed (char* pitem = item)
{
var len = pitem + item.Length;
for (var p = pitem ; p < len; p++)
if (*p >= '0' && *p <= '9')
level = level * 10 + *p - 48;
else
level = 0;
}
Results
Mode : Release
Test Framework : .NET Framework 4.7.1
Benchmarks runs : 1000 times (averaged)
Scale : 1,000
Name | Average | Fastest | StDv | Cycles | Pass | Gain
--------------------------------------------------------------------------
Mine | 0.095 ms | 0.085 ms | 0.01 | 317,205 | Yes | 96.59 %
Sanan | 0.202 ms | 0.184 ms | 0.02 | 680,747 | Yes | 92.75 %
Zaza | 0.373 ms | 0.316 ms | 0.10 | 1,254,302 | Yes | 86.60 %
Kishore | 0.479 ms | 0.423 ms | 0.06 | 1,620,756 | Yes | 82.81 %
Hussein | 1.045 ms | 0.946 ms | 0.11 | 3,547,305 | Yes | 62.50 %
Maccettura | 2.787 ms | 2.476 ms | 0.39 | 9,474,133 | Base | 0.00 %
Hardkoded | 6.691 ms | 5.927 ms | 0.67 | 22,750,311 | Yes | -140.09 %
Tom | 11.561 ms | 10.635 ms | 0.78 | 39,344,419 | Yes | -314.80 %
Summary
All the solutions do different things in different ways, comparing them is not really apples to apples.
Don't use mine, its totally unrealistic and only for fun. Use the version that makes the most sense to you, that is the most robust and easiest to maintain.
As always, regex is the slowest.

If level is always the last part of the string, and all you care about is the actual number, then you can just do:
var level = text.Split(':').LastOrDefault();
This would just split on ':' and give you the last (or default) element. Given your example input, level = "10".

Try this:
string input = "Username:King100 ID:100 Level:10";
Match m = Regex.Match(input, #"\s*Level:(?<level>\d+)");
if (m.Success&& m.Groups["level"].Success)
Console.WriteLine(m.Groups["level"].Value);
Also works for:
string input = "Username:King100 Level:10 ID:100";

string text = texs.Substring(texs.IndexOf("Level:")+6);
System.Console.WriteLine(text);

Regex Pattern for filter out anything that doesn't Match

Using Regex.Replace(mystring, #"[^MV:0-9]", "") will remove any Letters that are not M,V,:, or 0-9 (\d could also be used) the problem is I want to remove anything that is not MV: then numbers.
I need to replace anything that is not this pattern with nothing:
Starting String | Wanted Result
---------------------------------------------------------
sdhfuiosdhusdhMV:1234567890sdfahuosdho | MV:1234567890
MV:2138911230989hdsafh89ash32893h8u098 | MV:2138911230989
809308ej0efj0934jf0934jf4fj84j8904jf09 | Null
123MV:1234321234mnnnio234324234njiojh3 | MV:1234321234
mdfmsdfuiovvvajio123oij213432ofjoi32mm | Null
But what I get with what I have is:
Starting String | Returned Result
---------------------------------------------------------
sdhfuiosdhusdhMV:1234567890sdfahuosdho | MV:1234567890
MV:2138911230989hdsafh89ash32893h8u098 | MV:213891123098989328938098
809308ej0efj0934jf0934jf4fj84j8904jf09 | 809308009340934484890409
123MV:1234321234mnnnio234324234njiojh3 | 123MV:12343212342343242343
mdfmsdfuiovvvajio123oij213432ofjoi32mm | mmvvv1232134232mm
And even if there is a Regex pattern for this would I be better off using something along the lines of:
if (Regex.IsMatch(strMyString, #"MV:"))
{
string[] strarMyString = Regex.Split(strMyString, #"MV:");
string[] strarNumbersAfterMV = Regex.Split(strarMyString[1], #"[^\d]");
string WhatIWant = strarNumbersAfterMV[0]
}
If I went with the Latter option would there be away to have:
string[] strarNumbersAfterMV = Regex.Split(strarMyString[1], #"[^\d]");
Only make one split at the first change from numbers? (It will always start with number following the MV:)

Can't you just do:
string matchedText = null;
var match = Regex.Match(myString, #"MV:[0-9]+");
if (match.Success)
{
matchedText = Value;
}
Console.WriteLine((matchedText == null) ? "Not found" : matchedText);
That should give you exactly what you need.

FIX Reading Repeating groups

I have a FIX log file. I'm iterating on the lines, putting each string into
Message m = new Message(str, false)
Because for some reason, validation fails on the file (even the first line). Now, I see that it's a 35=X type, and 268=4 (i.e. NoMDEntries=4, so I should have 4 groups in the message)
BUT, in the debug display I am not seeing any groups. m.base._groups has a count of 0.
The string in question is:
1128=9 | 9=363 | 35=X | 49=CME | 34=3151 | 52=20121216223556363 | 75=20121217 | 268=4 | 279=0 | 22=8 | 48=43585 | 83=902 | 107=6EH3 | 269=4 | 270=13186 | 273=223556000 | 286=5 | 279=0 | 22=8 | 48=43585 | 83=903 | 107=6EH3 | 269=E | 270=13186 | 271=9 | 273=223556000 | 279=0 | 22=8 | 48=43585 | 83=904 | 107=6EH3 | 269=F | 270=13185 | 273=223556000 | 279=1 | 22=8 | 48=43585 | 83=905 | 107=6EH3 | 269=0 | 270=13186 | 271=122 | 273=223556000 | 336=0 | 346=10 | 1023=1 | 10=179 |
Another thing is how do I read the groups? Instinctively, I want to do something like
for (int i = 1; i <= noMDEntries; i++) {
Group g = m.GetGroup(i);
int action = Int32.Parse(g.GetField(279));
....
}
But that's not how it works and I haven't found documentation with better explanations.
Thanks for the help,
Yonatan.

From your code snippets, I think you're using QuickFIX/n, the native C# implementation, so I will answer accordingly.
1) Your message construction is failing because you didn't provide a DataDictionary.
Use Message::FromString instead:
Message m = new Message();
m.FromString(msg_str, false, data_dic, data_dic, someMsgFactory);
Even better, use MarketDataIncrementalRefresh::FromString to get the right return type.
You can see some uses of this function here:
https://github.com/connamara/quickfixn/blob/master/UnitTests/MessageTests.cs
2) To read groups... well, QF/n has a doc page on that, which I think explains it pretty well.
http://quickfixn.org/tutorial/repeating-groups

how to get records entered in text file based on key value

I am developing windows project using c#. I have to import text file records into sqlserver 2005 db.
My question is
I want to read records from text file using student Idno.
I have an idea of read exact value from text file using strings that is finding student no:1001 value .
I want to read every student record based on particular student no? not for 1001
so I want standered code to read particular records based on student number as
my choice.
plz help me.......
my text file like this
|-----------------------------------------------|
| student no:1001 |
| address:ongole,A.P, |
| hyderabad,india. |
| ----------------------------------------------|
| stdid stdname class |
| 1 raheem mca |
| 2 sudheer mca |
| ----------------------------------------------|
| student no:1001 |
| address:ongole,A.P, |
| hyderabad,india. |
-|-------------------------------------------- |
| stdid stdname class |
| 1 raheem mca |
| 2 sudheer mca |
| ----------------------------------------------|
| student no:1002 |
| address:ongole,A.P, |
| hyderabad,india. |
------------------------------------------------|-
| student no:1003 |
| address:ongole,A.P, |
| hyderabad,india. |
-|---------------------------------------------- |
My code is
private void BtnImpstrm_Click(object sender, EventArgs e)
{
openFileDialog1.ShowDialog();
string f = openFileDialog1.FileName;
StreamReader sr = new StreamReader(f);
string s = sr.ReadToEnd();
MessageBox.Show(s);
sr.Close();
str =s.Split('\n');
for (int i = 0; i < str.Length; i++)
{
if (str[i].ToString().Trim().ToUpper().Contains("Student NO : 1001"))
{
string[] words = str[i].Split(' ');
string output = words[word no].ToString().Trim();
string rec1 =str[line no].ToString().Trim();
string rec2 = str[line no].ToString().Trim();
MessageBox.Show(output);
MessageBox.Show(rec1);
MessageBox.Show(rec2);
}
}
}

I think your best bet would be to use StreamReader to read line-by-line and if you encounter "student ..." or something like it, read the next 7 lines to complete your record. After doing this, you will have a collection of strings, each being a unique record in the file.
Then you can parse each record individually, by splitting the string on Environment.NewLine.

How to use C# to parse a glossary into database?

This should be a simple one, but I'm a beginner with C#.
Given a glossary list in the following format:
aptitude
ability, skill, gift, talent
aqueous
watery
arguably
maybe, perhaps, possibly, could be
How can I parse this, and insert into a database table in the format:
TABLE: Term_Glossary
================================================
Term_Name | Term_Definition |
================================================
aptitude | ability, skill, gift, talent |
------------------------------------------------
aqueous | watery |
------------------------------------------------
arguably | maybe, perhaps, possibly, could be|
================================================
Any help would be appreciated - thanks.
Update
I realize the database structure is simple/inefficient - but really, the point of my question is the code to parse the kind of text found in the first example, using C#. Thanks.

It may seem more complex at first, but you'll find it a lot easier in the long-term to think in terms of two tables:
===========================================
Term_ID | Term_Name |
===========================================
1 | aptitude |
2 | aqueous |
3 | arguably |
===========================================
===============================================
Definition_ID | Term_ID | Definition_Name |
===============================================
1 | 1 | ability |
2 | 1 | skill |
3 | 1 | gift |
4 | 1 | talent |
5 | 2 | watery |
6 | 3 | maybe |
7 | etc.etc.etc
Perhaps even think if you can normalise this further by having one table of words with IDs and a table of associations.

It looks to me like you would read the first line, save it to a variable, read the second line, save it to a second variable, then insert into the table where Term_Name = first variable, and Term_Definition = second variable.
So your logic would be like:
StreamReader SR;
string Term_Name;
string Term_Definition
SR = File.OpenText(filename);
Term_Name = SR.ReadLine();
while(Term_Name != null)
{
Term_Definition = SR.ReadLine();
// make your database call here to insert with these two variables. I don't know what DB you are using.
Term_Name = SR.ReadLine();
}
SR.Close();