Solved

Neat way to limit Textbox contents in C#. Maximum contents vs performance ?

Posted on 2004-04-03
3
655 Views
Last Modified: 2008-02-01
Hi

Is there a neat way in C# to limit the amount of data in a text box control. I use a textbox as a terminal window showing date time stamped information. Two questions...

1) What is the maximum chars I can have in a text box and where will I lose performance if it gets enormous
2) Does C# have a neater way of 'nibbling' off the earliest entries when a preset number of lines has been reached. No VS.Net on hand so pigeon code for current method is:

TextBox.Append myString;
if(TextBox.Length>10000){
  TextBox.Text=TextBox.SubString(1000);
}
0
Comment
Question by:nvms
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 15

Expert Comment

by:Timbo87
ID: 10750473
Set the MaxLength property of the textbox to whatever the maximum amount you want is. It's 32,767 by default, but you can even set it higher. The maximum number of letters is probably the maximum size of a string (VERY large, but I don't recall the exact amount).
0
 
LVL 4

Accepted Solution

by:
AndreSteffens earned 50 total points
ID: 10753309
The textbox has a Lines property which is an array of strings (provided the textbox is multiline of course)
what you could do is remove a line of text when the number of lines excees a certain number:
            private void textBox1_TextChanged(object sender, System.EventArgs e)
            {
                  if(textBox1.Lines.Length>10)
                  {
                        string[] newlines=new string[textBox1.Lines.Length-1];
                        int counter=0;
                        foreach(string line in textBox1.Lines)
                        {
                              if(counter>0)
                              {
                                    newlines[counter-1]=line;
                              }
                              counter++;
                        }
                        textBox1.Lines=newlines;
                        textBox1.SelectionStart=textBox1.Text.Length;//put the cursor at the end of the textbox
                  }
            }
When you set the AcceptsReturn property of the textbox to true you can easily test this, as you can use the enter key to create new lines in the textbox
0
 

Author Comment

by:nvms
ID: 10762628
Thanks Andre, that function works well, tested to 1000 lines and very little impact on performance. The earlier comment simply limits entry size where as Andre appreciated the requirement for a 'rolling buffer' of information.

I thought perhaps .Net had an intrinsic extension to the text handling code with this may not be the case

Cheers : )

0

Featured Post

Enroll in June's Course of the Month

June's Course of the Month is now available! Every 10 seconds, a consumer gets hit with ransomware. Refresh your knowledge of ransomware best practices by enrolling in this month's complimentary course for Premium Members, Team Accounts, and Qualified Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Real-time is more about the business, not the technology. In day-to-day life, to make real-time decisions like buying or investing, business needs the latest information(e.g. Gold Rate/Stock Rate). Unlike traditional days, you need not wait for a fe…
This article aims to explain the working of CircularLogArchiver. This tool was designed to solve the buildup of log file in cases where systems do not support circular logging or where circular logging is not enabled
This is a high-level webinar that covers the history of enterprise open source database use. It addresses both the advantages companies see in using open source database technologies, as well as the fears and reservations they might have. In this…
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…

724 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question