How to split the string values in C# dynamically ?

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I am having the string value which is around 1750 characters. I am planing to save 500 bytes one by one since at a time at most 512 bytes can be saved . I am able to save statically considering the length limit. I want to do the same dynamically.

What I have tried:

Core code is as below:

try
           {
               string encLine = string.Empty;
               string encKey = string.Empty;
               using (StreamReader sr = new StreamReader(@"D:\test.txt"))
               {
                   // Read the stream to a string, and write the string to the console.
                   string line = sr.ReadToEnd();

                   int length = line.Length;
                   int nextlength = length - line.Substring(0, 500).Length;
                   for (int i = 0; i < 500; i++)
                   {
                       string test = line.Substring(0, 500);
                       SavePassword(test);
                       string test2 = line.Substring(500, nextlength);
                       SavePassword(test2);
                   }

                   //line.LastIndexOf(' ', 0, 100).ToString();
                   //Console.WriteLine(line);

               }

Posted 4-Jun-18 1:40am

ranio

Updated 1-Dec-18 9:12am

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3 solutions

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OriginalGriff · Answer 1 · 2018-06-04T01:59:00

As I said when you asked time last time: How to split a text file on reading the file in C#?[^]

Quote:
Use Streamreader.Read[^] and you can specify exactly how many characters to read at a time.

And as you were also told:

Quote:
Your text file is protected by GnuPG software. You have to decrypt it to be able to read its content.

Asking the same question does not change the answers, even if you want it too...

Nathan Minier · Answer 2 · 2018-06-04T02:24:00

So there's a couple of issues here that need to be addressed.

First off, the encoding type of the string is essential to know in advance if you're constrained to a specific byte length. We'll run under the assumption that it's UTF-8, but bear in mind that you may need to adjust for other encoding types.

Secondly, you have an arbitrary string length, so you cannot rely on taking specifically sized chunks of the string (otherwise 250 would be perfect). There's a few ways to skin this, but the easiest is to adapt your loop:

C#

using(StreamReader reader = new StreamReader(@"d:\test.txt"))
{
   var stringToChunk = reader.ReadToEnd();

   //Assuming UTF-8, so 1 byte per char
   var chunkLength = 512; //may as well max it out

   for(var i = 0; i < stringToChunk.Length; i += chunkLength)
   {
      //make sure we don't run past our buffer
      if(i + chunkLength > stringToChunk.Length)
      {
         chunkLength = stringToChunk.Length - i;
      }
      
      var chunk = stringToChunk.Substring(i, chunkLength);
      // do something with chunk
   }
}

sheetalsrss · Answer 3 · 2018-12-01T09:13:00

string MainAddress = "ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789XXXXXX";
           int TotalLenght = MainAddress.Length;
           int Lenght_1 = 0, Lenght_2 = 0, Lenght_3 = 0;
           if (TotalLenght <= 35)
           {
               Lenght_1 = TotalLenght;
           }
           else
           {
               Lenght_1 = 35;
               if (TotalLenght <= 70)
               {
                   Lenght_2 = TotalLenght-Lenght_1;

               }
               else
               {
                   Lenght_2 = 35;
                   if (TotalLenght <= 105)
                   {
                       Lenght_3 = TotalLenght-(Lenght_1+Lenght_2);

                   }
                   else
                   {
                       Lenght_3 = 35;

                   }

               }
           }


           add1.Text = MainAddress.Substring(0, Lenght_1);
           add2.Text = MainAddress.Substring(Lenght_1, Lenght_2);
           add3.Text = MainAddress.Substring(Lenght_1 + Lenght_2,Lenght_3);

How to split the string values in C# dynamically ?

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