Split string to an Arraylist in C#

Hi sirbounty ,

since the string size in my app is dynamic, if use string [], how can define size? Thanks.

 

Hi Fernando,

Thank you for comments. It works. But I still have some question to ask you. Below is  my original code which didn't work:

string cType = group.CustomerTypeID;   //test data '11/111/112/113/114/115/'
 String cTypeList = new String();
 cTypeList = cType.Split("/");
             
 ArrayList displayDetail1 = new ArrayList();
 for (int j = 0; j < cTypeList.Length; j++)
    { displayDetail.Add(cTypeList[j]); }


I don't know why I need to remove the last '/ ' at the end of the string, otherwise String.Split will give an empty element because of it.

Hi dtwoway;

I modified your code below so that it should work.

      string cType = group.CustomerTypeID;   //test data '11/111/112/113/114/115/'
      string[] cTypeList;
      cTypeList = cType.Split('/');
             
      ArrayList displayDetail1 = new ArrayList();
      for (int j = 0; j < cTypeList.Length; j++)
      { displayDetail1.Add(cTypeList[j]); }

In your original code you had this:

        String cTypeList = new String();

The above statement is incomplete. This form requires at minimum 1 parameter to initialize the string and not a string array. For example the following line of code will initialize the variable cTypeList to a string of 10 A's.

        string cTypeList = new string('A', 10); // = "AAAAAAAAAA"

To create an array of strings you can use the following statement.

        string[] cTypeList;

The next thing that I found was this statement.

        cTypeList = cType.Split("/");

The String.Split method take an array of Unicode characters and not a string of characters. So it should be like this.

        cTypeList = cType.Split('/');  // meaning the Unicode char / and not string

The last thing I found was a type O, you declared the ArrayList as displayDetail1 but when you used it you called it displayDetail.

Just one more thing in this case it would be more efficient to create the ArrayList as follows:

        displayDetail1.AddRange( cTypeList );

and not use the for loop.

Fernando

Hi Fernando,

Thank you so much!  Acturally I would like to ask you more questions, but i am not sure is that Ok for you. Anyway, thanks for detail comments.

Hi dtwoway;

I forgot to answer this question you had. "I don't know why I need to remove the last '/ ' at the end of the string, otherwise String.Split will give an empty element because of it."

        string cType = "11/111/112/113/114/115/";

The String.Split examines each character and assigns it to the current element in the array. When it gets to a character that it must do a split on it deletes the split character and adds another element to the array and then starts the process all over again. So when it gets to the last '/' character it deletes it and adds another element to the array and because there are no more characters that element of the array is empty. So the following statement:

        cTypeList = cType.Split('/');

will assign to cTypeList the following stings:

        cTypeList[0] = "11"
        cTypeList[1] = "111"
        cTypeList[2] = "112"
        cTypeList[3] = "113"
        cTypeList[4] = "114
        cTypeList[5] = "115"
        cTypeList[6] = ""

Removing the last '/' in the original string will give a array with elements 0 - 5 leaving out the empty element 6.

Fernando