. NET implementation split character cutting

Yesterday, my friend interviewed for Android, pen questions. Completely do not test Android, test programming basis (PS: Also completely handwritten on paper)

The following: Implementing the Split function

Requirements

Function one: realize single character cutting. such as: Split (' | ');

Requirement two: To achieve the cut of the string, such as: Split ("abc");

So I gave the first version of

         Public Static string[] Spiltstrings ( This stringStrCharsplitstr) {            if(!Str. EndsWith (Splitstr.tostring ())) {str+=Splitstr; }            varList =Newlist<string>(); vartemp =0;  for(inti =0; I < Str. Length; i++)            {                varitem =Str[i]; if(string. Equals (item, SPLITSTR)) {list. ADD (str. Substring (temp, I-temp)); Temp=Str.                    IndexOf (item, i); STR= str. Remove (I,1); }            }            returnlist.        ToArray (); }

Call Method:

            var str = "123|45| | ";            var a = str. Spiltstrings (' | ');

The results of the operation are as follows:

The result of the self-spiit function is as follows

There is still a certain gap.

The Continuous "| |" cannot be resolved temporarily. Problem

Summary of the problems encountered:

One: foreach (var item in str): Take Str.indexof (item); Item may have more than one string. IndexOf (item) is always the first one unable to locate his correct position (PS: Available indexOf (Char,startindex), Trouble)

Two: Mainly rely on the substring function, easy to cause the detail problem. Difficult to handle

Three: Str. Remove (index); Remember to reassign: str = str. Remove (index);

Upgrade version

         Public Static string[] spiltstrings_s ( This stringStrCharsplitstr) {            varList =Newlist<string>(); varSB =NewStringBuilder (); if(!Str. EndsWith (Splitstr.tostring ())) {str+=Splitstr; }            foreach(varIteminchstr) {sb. Append (""); if(!string. Equals (item, SPLITSTR)) {sb.                Append (item); }                Else{list. ADD (sb.)                    ToString ()); SB=NewStringBuilder (); }            }            returnlist.        ToArray (); }

The results of the operation are as follows:

Okay, get it done.

It seems simple, but we are all standing on the shoulders of giants.

Function Two: There is no way to find what you can do, temporarily paste this. Changed on the original version.

The code is as follows:

         Public Static string[] Spiltstrings ( This stringStrstringsplitstr) {            varList =Newlist<string>(); vartemp =0; varSplitlenth =splitstr.length; varEndstr = str. Substring (str. Length-splitlenth); if(!string. Equals (Endstr, splitstr)) {str+=Splitstr; }             for(vari =0; I < Str. Length; i++)            {                varSTR1 =string.                Empty;  for(varj =0; J < Splitlenth; J + +)                {                    if(i + J >=Str. Length) { Break; } str1+ = Str[i +J]; }                if(string. Equals (STR1, splitstr)) {list. ADD (str. Substring (temp, I-temp)); Temp=i; STR=Str.                Remove (i, splitstr.length); }            }            returnlist.        ToArray (); }

Call:

            var " 12454$$454$$$4445 " ;             var b = str1. Spiltstrings ("$$");

Operation Result:

There are also problems:

One: When multiple consecutive occurrences of "$$$", cutting symbol "$$", the demand for cutting is not clear

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Finally, welcome to the big God paste algorithm solution, the point is insufficient. I'm a rookie, need to learn

. NET implementation split character cutting