I'm using String.Join to attempt to turn an array list into a string that is comma separated, such as
xxx#xxx.com,yyy#xxx.com,zzz#xxx.com,www#xxx.com
I can't seem to get the syntax working.
Here's what I'm trying:
for (i = 0; i < xxx; i++)
{
MailingList = arrayList[i].ToString();
MailingList = string.Join(", ", MailingList.ToString());
Response.Write(MailingList.ToString());
}
Can you help me?
Thank you in advance-
Guessing from the name of your variable (arrayList), you've got List<string[]> or an equivalent type there.
The issue here is that you're calling ToString() on the array.
Try this instead:
for (i = 0; i < xxx; i++)
{
var array = arrayList[i];
MailingList = string.Join(", ", array);
Response.Write(MailingList);
}
EDIT: If arrayList is simply an ArrayList containing strings, you can just do
Response.Write(string.Join(", ", arrayList.OfType<string>()));
Personally I would avoid using nongeneric collections (such as ArrayList) if possible and use strongly-typed collections from System.Collections.Generic such as List<string>. For example, if you have a piece of code that depends on that all contents of the ArrayList are strings, it will suffer catastrophically if you accidentally add an item that's not a string.
EDIT 2: If your ArrayList actually contains System.Web.UI.WebControls.ListItems like you mentioned in your comment: arrayList.AddRange(ListBox.Items);, then you'll need to use this instead:
Response.Write(string.Join(", ", arrayList.OfType<ListItem>()));
The second parameter for String.Join needs to be an IEnumerable. Replace MailingList.ToString() with arrayList and it should work.
Initialization:
string result = string.Empty;
For value types:
if (arrayList != null) {
foreach(var entry in arrayList){
result += entry + ',';
}
}
For reference types:
if (arrayList != null) {
foreach(var entry in arrayList){
if(entry != null)
result += entry + ',';
}
}
And cleanup:
if(result == string.Empty)
result = null;
else
result = result.Substring(0, result.Length - 1);
most of the answers are already there, still posting a complete - working snippet
string[] emailListOne = { "xxx#xxx.com", "yyy#xxx.com", "zzz#xxx.com", "www#xxx.com" };
string[] emailListTwo = { "xxx#xxx1.com", "yyy#xxx1.com", "zzz#xxx1.com", "www#xxx1.com" };
string[] emailListThree = { "xxx#xxx2.com", "yyy#xxx2.com", "zzz#xxx2.com", "www#xxx.com" };
string[] emailListFour = { "xxx#xxx3.com", "yyy#xxx3.com", "zzz#xxx3.com", "www#xxx3.com" };
List<string[]> emailArrayList = new List<string[]>();
emailArrayList.Add(emailListOne);
emailArrayList.Add(emailListTwo);
emailArrayList.Add(emailListThree);
emailArrayList.Add(emailListFour);
StringBuilder csvList = new StringBuilder();
int i = 0;
foreach (var list in emailArrayList)
{
csvList.Append(string.Join(",", list));
if(i < emailArrayList.Count - 1)
csvList.Append(",");
i++;
}
Response.Write(csvList.ToString());
Related
The string I want to split is an array of strings.
the array contains strings like:
G1,Active
G2,Inactive
G3,Inactive
.
.
G24,Active
Now I want to store the G's in an array, and Active or Inactive in a different array. So far I have tried this which has successfully store all the G's part but I have lost the other part. I used Split fucntion but did not work so I have tried this.
int i = 0;
for(i = 0; i <= grids.Length; i++)
{
string temp = grids[i];
temp = temp.Replace(",", " ");
if (temp.Contains(' '))
{
int index = temp.IndexOf(' ');
grids[i] = temp.Substring(0, index);
}
//System.Console.WriteLine(temp);
}
Please help me how to achieve this goal. I am new to C#.
If I understand the problem correctly - we have an array of strings Eg:
arrayOfStrings[24] =
{
"G1,Active",
"G2,Inactive",
"G3,Active",
...
"G24,Active"
}
Now we want to split each item and store the g part in one array and the status into another.
Working with arrays the solution is to - traverse the arrayOfStrings.
Per each item in the arrayOfStrings we split it by ',' separator.
The Split operation will return another array of two elements the g part and the status - which will be stored respectively into distinct arrays (gArray and statusArray) for later retrieval. Those arrays will have a 1-to-1 relation.
Here is my implementation:
static string[] LoadArray()
{
return new string[]
{
"G1,Active",
"G2,Inactive",
"G3,Active",
"G4,Active",
"G5,Active",
"G6,Inactive",
"G7,Active",
"G8,Active",
"G9,Active",
"G10,Active",
"G11,Inactive",
"G12,Active",
"G13,Active",
"G14,Inactive",
"G15,Active",
"G16,Inactive",
"G17,Active",
"G18,Active",
"G19,Inactive",
"G20,Active",
"G21,Inactive",
"G22,Active",
"G23,Inactive",
"G24,Active"
};
}
static void Main(string[] args)
{
string[] myarrayOfStrings = LoadArray();
string[] gArray = new string[24];
string[] statusArray = new string[24];
int index = 0;
foreach (var item in myarrayOfStrings)
{
var arraySplit = item.Split(',');
gArray[index] = arraySplit[0];
statusArray[index] = arraySplit[1];
index++;
}
for (int i = 0; i < gArray.Length; i++)
{
Console.WriteLine("{0} has status : {1}", gArray[i] , statusArray[i]);
}
Console.ReadLine();
}
seems like you have a list of Gxx,Active my recomendation is first of all you split the string based on the space, which will give you the array previoulsy mentioned doing the next:
string text = "G1,Active G2,Inactive G3,Inactive G24,Active";
string[] splitedGItems = text.Split(" ");
So, now you have an array, and I strongly recommend you to use an object/Tuple/Dictionary depends of what suits you more in the entire scenario. for now i will use Dictionary as it seems to be key-value
Dictionary<string, string> GxListActiveInactive = new Dictionary<string, string>();
foreach(var singleGItems in splitedGItems)
{
string[] definition = singleGItems.Split(",");
GxListActiveInactive.Add(definition[0], definition[1]);
}
What im achiving in this code is create a collection which is key-value, now you have to search the G24 manually doing the next
string G24Value = GxListActiveInactive.FirstOrDefault(a => a.Key == "G24").Value;
just do it :
var splitedArray = YourStringArray.ToDictionary(x=>x.Split(',')[0],x=>x.Split(',')[1]);
var gArray = splitedArray.Keys;
var activeInactiveArray = splitedArray.Values;
I hope it will be useful
You can divide the string using Split; the first part should be the G's, while the second part will be "Active" or "Inactive".
int i;
string[] temp, activity = new string[grids.Length];
for(i = 0; i <= grids.Length; i++)
{
temp = grids[i].Split(',');
grids[i] = temp[0];
activity[i] = temp[1];
}
Here is my string:
www.stackoverflow.com/questions/ask/user/end
I split it with / into a list of separated words:myString.Split('/').ToList()
Output:
www.stackoverflow.com
questions
ask
user
end
and I need to rejoin the string to get a list like this:
www.stackoverflow.com
www.stackoverflow.com/questions
www.stackoverflow.com/questions/ask
www.stackoverflow.com/questions/ask/user
www.stackoverflow.com/questions/ask/user/end
I think about linq aggregate but it seems it is not suitable here. I want to do this all through linq
You can try iterating over it with foreach
var splitted = "www.stackoverflow.com/questions/ask/user/end".Split('/').ToList();
string full = "";
foreach (var part in splitted)
{
full=$"{full}/{part}"
Console.Write(full);
}
Or use linq:
var splitted = "www.stackoverflow.com/questions/ask/user/end".Split('/').ToList();
var list = splitted.Select((x, i) => string.Join("/", a.Take(i + 1)));
Linq with side effect:
string prior = null;
var result = "www.stackoverflow.com/questions/ask/user/end"
.Split('/')
.Select(item => prior == null
? prior = item
: prior += "/" + item)
.ToList();
Let's print it out
Console.WriteLine(string.Join(Environment.NewLine, result));
Outcome:
www.stackoverflow.com
www.stackoverflow.com/questions
www.stackoverflow.com/questions/ask
www.stackoverflow.com/questions/ask/user
www.stackoverflow.com/questions/ask/user/end
Linq without side effects ;)
Enumerable.Aggregate can be used here if we use List<T> as a result.
var raw = "www.stackoverflow.com/questions/ask/user/end";
var actual =
raw.Split('/')
.Aggregate(new List<string>(),
(list, word) =>
{
var combined = list.Any() ? $"{list.Last()}/{word}" : word;
list.Add(combined);
return list;
});
without Linq write below code,
var str = "www.stackoverflow.com/questions/ask/user/end";
string[] full = str.Split('/');
string Result = string.Empty;
for (int i = 0; i < full.Length; i++)
{
Console.WriteLine(full[i]);
}
for (int i = 0; i < full.Length; i++)
{
if (i == 0)
{
Result = full[i];
}
else
{
Result += "/" + full[i];
}
Console.WriteLine(Result);
}
This is what I want to convernt: {"apple", "banana"} to "["apple", "banana"]"
I have tried convert string list to string array first, then convert string array to string, but did not work.
var testing = new List<string> {"apple", "banana"};
var arrayTesting = testing.ToArray();
var result = arrayTesting.ToString();
You can use string.Join(String, String[]) method like below to get a , separated string values (like csv format)
var stringifiedResult = string.Join(",", result);
You can try this, should work;
var testing = new List<string> { "apple", "banana" };
var arrayTesting = testing.ToArray<string>();
var result = string.Join(",", arrayTesting);
You can also use StringBuilder
StringBuilder sb = new StringBuilder();
sb.Append("\"[");
for (int i = 0; i < arrayTesting.Length; i++)
{
string item = arrayTesting[i];
sb.Append("\"");
sb.Append(item);
if (i == arrayTesting.Length - 1)
{
sb.Append("\"]");
}
else
sb.Append("\",");
}
Console.WriteLine(sb);
Instead of converting it to an array, you could use a linq operator on the list to write all the values into a string.
string temp = "";
testing.ForEach(x => temp += x + ", ");
This will leave you with a single string with each value in the list separated by a comma.
I dont much idea about Foreach Loop
I have 4 String Variables and i am storing the encrypted values from app.config in those varialbles.My Work is to Detect if there is data in those 4 variables.Even if one doesnt have values i want to pass a default encrypted values to it.I started doing like this......
string EncValue = oEncrypt.EncryptBase64String("NO Data Found");
UpdateOrCreateAppSetting("UserName", ref MPScmUserName);
UpdateOrCreateAppSetting("Password", ref MPScmPassword);
UpdateOrCreateAppSetting("DBUserName", ref MPDbUserName);
UpdateOrCreateAppSetting("DBPassword", ref MPDbPassword);
var list5 = from docs in doc1.Descendants("appender").Elements()
where docs.Name == "file"
select docs;
var element5 = list5.FirstOrDefault();
MPLoadAppConfig = appConfigFile1;
MPErrorLog = element5.Attribute("value").Value;
string[] namesArray = new string[] {
MPScmUserName,MPScmPassword,MPDbUserName,MPDbPassword};
foreach (string i in namesArray)
{
if (i is string)
{
if (i == "")
{
i = EncValue.ToString();
}
}
}
How should i assign default encrypted value to the strings in that array which is a empty string. Please Help me....
You don't need to say if (i is string) because it's already a string.
In another if block you may say
if(string.IsNullOrEmpty(i))
{
}
or you may use:
string[] arr = new string[] { "","A"};
for (int i = 0; i < arr.Length; i++)
{
if (string.IsNullOrEmpty(arr[i]))
{
arr[i] = "Hello";
}
}
Looping on the string array and changing the value of current string doesn't means you are changing the value of the string inside the array. When foreach loops on your array it returns a new string instance in i, so changing that i don't change the value in namesArray.
You need a traditional for loop with an indexer to access directly to the namesArray
for(int i = 0; i < namesArray.Length; i++)
{
if (namesArray[i] == string.Empty)
{
namesArray[i] = EncValue.ToString();
}
}
No need for the if (i is string) part because you already know it's a string. You should probably also use string.IsNullOrWhiteSpace(); to test for an empty string.
Edit (shameless copy from Mark's answer):
for (int i = 0; i < namesArray.Length; ++i)
{
if (string.IsNullOrWhiteSpace(namesArray[i]))
{
namesArray[i] = EncValue.ToString();
}
}
You can't modify the variable in a foreach loop. Your code should give you the following compile error:
Cannot assign to 'i' because it is a 'foreach iteration variable'
You could do this using LINQ:
namesArray = namesArray.Select(s => s == "" ? EncValue.ToString() : s).ToArray();
Alternatively you could use a simple for loop:
for (int i = 0; i < namesArray.Length; ++i)
{
if (namesArray[i] == "")
{
namesArray[i] = EncValue.ToString();
}
}
string[] newNamesArray =
Enumerable.Select(namesArray, s => s == "" ? EncValue : s).ToArray();
I have something like this in my code.
mystring.Split(new[]{"/","*"}, StringSplitOptions.RemoveEmptyEntries);
however, what I actually want is to separate mystring into two arrays, one holding the separated items above, and the other array to hold the delimiters above in the order they appear in the string.
I could use .IndexOf to continue searching until I extract all of them, but somehow I think this will be redundant. Is there a way to do this in .NET? If possible I want to avoid LINQ.
Thanks.
Something like:
var separators = new char[] { '/', '*' };
var words = new List<string>();
var delimiters = new List<string>();
var idx = source.IndexOfAny(separators);
var prevIdx = 0;
while (idx > -1)
{
if (idx - prevIdx > 0)
words.Add(source.Substring(prevIdx, idx - prevIdx));
prevIdx = idx + 1;
delimiters.Add(source.Substring(idx, 1));
idx = source.IndexOfAny(separators, idx + 1);
}
If I understand the questioner correctly, he wants the actual separated items as well as the delimiters.
I think the following code will work:
List<string> SeparatedItems = new List<string>();
List<string> Delimiters = new List<string>();
string sTestString = "mytest/string*isthis**and not/this";
string sSeparatedItemString = String.Empty;
foreach(char c in sTestString) {
if(c == '/' || c == '*') {
Delimiters.Add(c.ToString());
if(sSeparatedItemString != String.Empty) {
SeparatedItems.Add(sSeparatedItemString);
sSeparatedItemString = String.Empty;
}
}
else {
sSeparatedItemString += c.ToString();
}
}
if(sSeparatedItemString != String.Empty) {
SeparatedItems.Add(sSeparatedItemString);
}
Try this:
var items = new List<string>();
var delimiters = new List<string>();
items.AddRange(Regex.Split(text, #"(?<=/)|(?=/)|(?<=\*)|(?=\*)"));
for (int i = 0; i < items.Count; )
{
string item = items[i];
if (item == "*" || item == "/")
{
delimiters.Add(item);
items.RemoveAt(i);
}
else if (item == "")
{
items.RemoveAt(i);
}
else
{
i++;
}
}
You could consider a Regex expression using named groups. Try a nested named group. The outer including capturing the separator and the inner capturing the content only.
Since you're running in .NET 2.0, I'd say using IndexOf is one of the most straight forward ways to solve the problem:
public static int CountOccurences(string input, string pattern)
{
int count = 0;
int i = 0;
while (i = input.IndexOf(pattern, i) != -1)
count++;
return count;
}
The solution Rob Smyth suggests would also work, but I find this the easiest and most understandable one.