How can I dissect or retrieve string values?
Here's the sample code that I'm working on now:
private void SplitStrings()
{
List<string> listvalues = new List<string>();
listvalues = (List<string>)Session["mylist"];
string[] strvalues = listvalues.ToArray();
for (int x = 0; x < strvalues.Length; x++)
{
}
}
Now that I'am able to retrieve list values in my session. How can I separately get the values of each list using foreach or for statement?
What I want to happen is to programmatically split the values of the strings depending on how many is in the list.
If you have a list of string values, you can do the following:
private void SplitStrings()
{
List<string> listValues = (List<string>) Session["mylist"];
// always check session values for null
if(listValues != null)
{
// go through each list item
foreach(string stringElement in listValues)
{
// do something with variable 'stringElement'
System.Console.WriteLine(stringElement);
}
}
}
Note that I test the result of casting the session and that I don't create a new list first-off, which is not necessary. Also note that I don't convert to an array, simply because looping a list is actually easier, or just as easy, as looping an array.
Note that you named your method SplitStrings, but we're not splitting anything. Did you mean to split something like "one;two;three;four" in a four-element list, based on the separator character?
I'm not sure what you're trying to obtain in this code, I don't know why you're converting your List to an Array.
You can loop through your listValues collection with a foreach block:
foreach(string value in listValues)
{
//do something with value, I.e.
Response.Write(value);
}
I don't know what's in the strings but you can start by simplifying. There is no point allocating a new List if you're going to overwrite it immediately.
private void SplitStrings()
{
List<string> list = (List<string>)Session["mylist"];
foreach(string value in list)
{
}
}
List listvalues = (List)Session["mylist"];
foreach (string s in listvalues)
{
//do what you want with s here
}
Related
I was working on finding out the Common string part in the String list. If we take a sample data set
private readonly List<string> Xpath = new List<string>()
{
"BODY>MAIN:nth-of-type(1)>DIV>SECTION>DIV>SECTION>DIV>DIV:nth-of-type(1)>DIV>DIV:nth-of-type(3)>DIV>ARTICLE>DIV>DIV>DIV>SECTION:nth-of-type(1)>H2:nth-of-type(1)",
"BODY>MAIN:nth-of-type(1)>DIV>SECTION>DIV>SECTION>DIV>DIV:nth-of-type(1)>DIV>DIV:nth-of-type(3)>DIV>ARTICLE>DIV>DIV>DIV>SECTION:nth-of-type(2)>H2:nth-of-type(1)",
"BODY>MAIN:nth-of-type(1)>DIV>SECTION>DIV>SECTION>DIV>DIV:nth-of-type(1)>DIV>DIV:nth-of-type(3)>DIV>ARTICLE>DIV>DIV>DIV>SECTION:nth-of-type(3)>H2:nth-of-type(1)",
"BODY>MAIN:nth-of-type(1)>DIV>SECTION>DIV>SECTION>DIV>DIV:nth-of-type(1)>DIV>DIV:nth-of-type(3)>DIV>ARTICLE>DIV>DIV>DIV>SECTION:nth-of-type(4)>H2:nth-of-type(1)",
"BODY>MAIN:nth-of-type(1)>DIV>SECTION>DIV>SECTION>DIV>DIV:nth-of-type(1)>DIV>DIV:nth-of-type(3)>DIV>ARTICLE>DIV>DIV>DIV>SECTION:nth-of-type(5)>H2:nth-of-type(1)",
"BODY>MAIN:nth-of-type(1)>DIV>SECTION>DIV>SECTION>DIV>DIV:nth-of-type(1)>DIV>DIV:nth-of-type(3)>DIV>ARTICLE>DIV>DIV>DIV>SECTION:nth-of-type(6)>H2:nth-of-type(1)",
"BODY>MAIN:nth-of-type(1)>DIV>SECTION>DIV>SECTION>DIV>DIV:nth-of-type(1)>DIV>DIV:nth-of-type(3)>DIV>ARTICLE>DIV>DIV>DIV>SECTION:nth-of-type(7)>H2:nth-of-type(1)",
"BODY>MAIN:nth-of-type(1)>DIV>SECTION>DIV>SECTION>DIV>DIV:nth-of-type(1)>DIV>DIV:nth-of-type(3)>DIV>ARTICLE>DIV>DIV>DIV>SECTION:nth-of-type(8)>H2:nth-of-type(1)",
"BODY>MAIN:nth-of-type(1)>DIV>SECTION>DIV>SECTION>DIV>DIV:nth-of-type(1)>DIV>DIV:nth-of-type(3)>DIV>ARTICLE>DIV>DIV>DIV>SECTION:nth-of-type(9)>H2:nth-of-type(1)"
};
From this, I want to find out to which children these are similar. data is an Xpath list.
Programmatically I should be able to tell
Expected output:
BODY>MAIN:nth-of-type(1)>DIV>SECTION>DIV>SECTION>DIV>DIV:nth-of-type(1)>DIV>DIV:nth-of-type(3)>DIV>ARTICLE>DIV>DIV>DIV
In order to get this What I did was like this. I separate each item by > and then create a list of items for each dataset originally.
Then using this find out what are the unique items
private IEnumerable<T> GetCommonItems<T>(IEnumerable<T>[] lists)
{
HashSet<T> hs = new HashSet<T>(lists.First());
for (int i = 1; i < lists.Length; i++)
{
hs.IntersectWith(lists[i]);
}
return hs;
}
Able to find out the unique values and create a dataset again. But what happened is if this contains Ex:- Div in two places and it also in every originally dataset even then this method will pick up only one Div.
From then I would get something like this:
BODY>MAIN:nth-of-type(1)>DIV>SECTION
But I need this
BODY>MAIN:nth-of-type(1)>DIV>SECTION>DIV>SECTION>DIV>DIV:nth-of-type(1)>DIV>DIV:nth-of-
type(3)>DIV>ARTICLE>DIV>DIV>DIV
Disclaimer: This is not the most performant solution but it works :)
Let's start with splitting the first path by > character
Do the same with all the paths
char separator = '>';
IEnumerable<string> firstPathChunks = Xpath[0].Split(separator);
var chunks = Xpath.Select(path => path.Split(separator).ToList()).ToArray();
Iterate through the firstPathChunks
Iterate through the chunks
if there is a match then remove the first element
if all first element is removed then append the matching prefix to sb
void Process(StringBuilder sb)
{
foreach (var pathChunk in firstPathChunks)
{
foreach (var chunk in chunks)
{
if (chunk[0] != pathChunk)
{
return;
}
chunk.RemoveAt(0);
}
sb.Append(pathChunk);
sb.Append(separator);
}
}
Sample usage
var sb = new StringBuilder();
Process(sb);
Console.WriteLine(sb.ToString());
Output
BODY>MAIN:nth-of-type(1)>DIV>SECTION>DIV>SECTION>DIV>DIV:nth-of-type(1)>DIV>DIV:nth-of-type(3)>DIV>ARTICLE>DIV>DIV>DIV>
Parsing the string by the seperator > is a good idea. Instead of then creating a list of unique items you should create a list of all items contained in the string which would result in
{
"BODY",
"MAIN:nth-of-type(1)",
"DIV",
"SECTTION",
"DIV",
...
}
for the first entry of your XPath list.
This way you create a List<List<string>> containing every element of each entry of your XPath list. You then can compare all first elements of the inner lists. If they are equal save that elements value to you output and proceed with all second elements and so on until you find an element that is not equal in all outer lists.
Edit:
After seperating your list by the > seperator this could look something like this:
List<List<string>> XPathElementsLists;
List<string> resultElements = new List<string>();
string result;
XPathElementsLists = ParseElementsFormXPath(XPath);
for (int i = 0; i < XPathElementsLists[0].Count; i++)
{
bool isEqual = true;
string compareElemment = XPathElementsLists[0][i];
foreach (List<string> element in XPathElementsLists)
{
if (!String.Equals(compareElemment, element))
{
isEqual = false;
break;
}
}
if (!isEqual)
{
break;
}
resultElements.Add(compareElemment);
}
result = String.Join(">", resultElements.ToArray());
I've converted cells in my excel range from strings to form a string list and have separated each item after the comma in the original list. I am starting to think I have not actually separated each item, and they are still one whole, trying to figure out how to do this properly so that each item( ie. the_red_bucket_01)is it's own string.
example of original string in a cell 1 and 2:
Cell1 :
the_red_bucket_01, the_blue_duck_01,_the green_banana_02, the orange_bear_01
Cell2 :
the_purple_chair_01, the_blue_coyote_01,_the green_banana_02, the orange_bear_01
The new list looks like this, though I'm not sure they are separate items:
the_red_bucket_01
the_blue_duck_01
the green_banana_02
the orange_bear_01
the_red_chair_01
the_blue_coyote_01
the green_banana_02
the orange_bear_01
Now I want to remove duplicates so that the console only shows 1 of each item, no matter how many there are of them, I can't seem to get my foreah/if statements to work. It is printing out multiple copies of the items, I'm assuming because it is iterating for each item in the list, so it is returning the data that many items.
foreach (Excel.Range item in xlRng)
{
string itemString = (string)item.Text;
List<String> fn = new List<String>(itemString.Split(','));
List<string> newList = new List<string>();
foreach (string s in fn)
if (!newList.Contains(s))
{
newList.Add(s);
}
foreach (string combo in newList)
{
Console.Write(combo);
}
You probably need to trim the strings, because they have leading white spaces, so "string1" is different from " string1".
foreach (string s in fn)
if (!newList.Contains(s.Trim()))
{
newList.Add(s);
}
You can do this much simpler with Linq by using Distinct.
Returns distinct elements from a sequence by using the default
equality comparer to compare values.
foreach (Excel.Range item in xlRng)
{
string itemString = (string)item.Text;
List<String> fn = new List<String>(itemString.Split(','));
foreach (string combo in fn.Distinct())
{
Console.Write(combo);
}
}
As mentioned in another answer, you may also need to Trim any whitespace, in which case you would do:
fn.Select(x => x.Trim()).Distinct()
Where you need to contain keys/values, its better to use Dictionary type. Try changing code with List<T> to Dictionary<T>. i.e.
From:
List<string> newList = new List<string>();
foreach (string s in fn)
if (!newList.Containss))
{
newList.Add(s);
}
to
Dictionary<string, string> newList = new Dictionary<string, string>();
foreach (string s in fn)
if (!newList.ContainsKey(s))
{
newList.Add(s, s);
}
If you are concerned about the distinct items while you are reading, then just use the Distinct operator like fn.Distinct()
For processing the whole data, I can suggest two methods:
Read in the whole data then use LINQ's Distinct operator
Or use a Set data structure and store each element in that while reading the excel
I suggest that you take a look at the LINQ documentation if you are processing data. It has really great extensions. For even more methods, you can check out the MoreLINQ package.
I think your code would probably work as you expect if you moved newList out of the loop - you create a new variable named newList each loop so it's not going to find duplicates from earlier loops.
You can do all of this this more concisely with Linq:
//set up some similar data
string list1 = "a,b,c,d,a,f";
string list2 = "a,b,c,d,a,f";
List<string> lists = new List<string> {list1,list2};
// find unique items
var result = lists.SelectMany(i=>i.Split(',')).Distinct().ToList();
SelectMany() "flattens" the list of lists into a list.
Distinct() removes duplicates.
var uniqueItems = new HashSet<string>();
foreach (Excel.Range cell in xlRng)
{
var cellText = (string)cell.Text;
foreach (var item in cellText.Split(',').Select(s => s.Trim()))
{
uniqueItems.Add(item);
}
}
foreach (var item in uniqueItems)
{
Console.WriteLine(item);
}
I'd like to be able to collect all the string values in a Winform ListBox. At the moment my code loops through the ListBox and gets the values, but it's appending all values together in one long string:
private string GetFormNumberValues()
{
string formNumbers = "";
foreach (string item in this.lbFormNumbers.Items)
{
formNumbers += item.ToString();
}
return formNumbers;
}
How can I collect each individual string value to use for later? Thanks.
You can have them in a List this way:
var list = listBox1.Items.Cast<object>().Select(x => x.ToString()).ToList();
Try something like this:
private string[] GetFormNumberValues()
{
List<string> strings = new List<string>();
foreach (string item in this.lbFormNumbers.Items)
{
strings.Add(item.ToString());
}
return strings.ToArray();
}
(Depending on your needs, you could simplify this by returning a List rather than an array...)
I am trying to pass a varying amount of strings into a List and than manipulate these strings.
I am attempting something like this but I think I am doing it wrong:
public static void ActivateStateFilter(List<string> lStatelist)
{
for (int index = 0; index < lStatelist.Count; index++) // Loop with for.
{
lStatelist.Add(lStatelist[index]); //Add strings to the list
}
}
This is how I attempt to pass values:
ActivateStateFilter(new List<string> {"Active", "Inactive"});
Thanks in advance!
You are adding the existing items how new item in the sended list.
Your code duplicate lStatelist with their existing items.
What are you really trying to do?
if you are trying to insert your string on specific index use this:
lStatelist.Insert(index, newstring);
Your code will throw an OutOfmemoryException, because you create an infinite loop.
You are adding the items of a list to the list containing the items… and you are doing this for every item in the list…which will create an infinite loop.
I think you are looking for something like this:
public class Program
{
private static readonly List<String> _lStateList = new List<String>();
static void Main( String[] args )
{
ActivateStateFilter( new List<String> { "1", "2" } );
}
private static void ActivateStateFilter( IEnumerable<String> values )
{
_lStateList.AddRange( values );
}
}
This code will add a range of stirng values to _lStateList
foreach (set.row officeJoin in officeJoinMeta)
{
foreach (set.somethingRow confRow in myData.something.Rows)
{
string dep = confRow["columnName"].ToString();
depts.Add(dep);
}
}
I've got this for-loop going through a column, adding each value in a column to dep, and later storing all these in a List < String > depts which i defined at the top of this method.
Some of the values in the dep are single strings like "R" but some are need to be separated after the comma "R,GL,BD".
I understand using .Split(","), but how do i split strings--how do i get each value in the array, split them with the comma, then store them in another array?
Written based on what you've explained:
foreach (set.row officeJoin in officeJoinMeta)
{
foreach (set.somethingRow confRow in myData.something.Rows)
{
string dep = confRow["columnName"].ToString();
depts.AddRange(dep.Split(','));
}
}
declare as
List<string[]> depts = new List<string[]>()
and add as
depts.Add(dep.Split(','));
List<string> depts=new List<dept>();
var values=dept].Split(',');
for(int index=0;index<values.length;index++)
{
depts.Add(values[index].ToString());
}