How to compare text in two rich text boxes

Question

3.00/5 (1 vote)

See more:

Am trying to compare the text in rich textbox, with the ones in richTextBox two, then highlight the diffrent portion in textBox2....i used these codes...but its not higlighting all

C#

richTextBox2.SelectionBackColor = Color.DarkRed;
      //  string[] Original = richTextBox1.Lines;
        //string[] Original1 = richTextBox2.Lines;

        string[] Test1 = richTextBox1.Text.Split(new char[] {' '});
        string[] Test2 = richTextBox2.Text.Split(new char[] {' '});
      //  bool? result = null;
        int k = 0;
        if(Test1.Length>Test2.Length)
        {
            k = Test1.Length;
        }
        else
        {
            k = Test2.Length;
        }
        for (int i = 0; i < k; i++ )
        {
            //Original.Equals(Original1, StringComparison.Ordinal);
            var word1 =Test1[i];
            var word2 = Test2[i];

            if (word1 != word2)
            {
                richTextBox2.SelectionStart = i;
                richTextBox2.SelectionLength = i + 1;
            }
        }
    }

Posted 25-Aug-13 10:13am

Member 9769841

Add a Solution

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Answer 1 · 2013-08-25T10:31:00

This code is far from working. First of all, you select by indices of words in the split array, not by indices of the characters in the words. Your split does not handle such things when words are separated by punctuation characters (which could be punctuation error but still happens). The difference itself is not well defined. You need to handle the cases when matching words changed the position (say, you inserted some additional text between them), but still placed in the same order and matching. I suggest you study the operation of some well-known differs and formulate some good requirements for yours.

And finally, using selection is not a good idea. When the user clicks on some text, the selection will disappear, and hitting delete button will delete all selected text. Rather, you should mark your differences with special background/foreground color.

—SA

Florian Rosmann · Answer 2 · 2013-08-25T10:24:00

Solution 1

I am not sure but I would guess that SelectionStart and SelectionLength should be measured in chars and not in words.
Oh and you can replace your if(...) by int k = Math.Max(Test1.Length, Test2.Length).

Posted 25-Aug-13 10:24am

Florian Rosmann

Member 9769841 · Answer 3 · 2013-08-26T00:01:00

public void check()
{

List<string> Test1 = new List<string>(richTextBox1.Text.Split(new char[] { ' ' }));
List<string> Test2 = new List<string>(richTextBox2.Text.Split(new char[] { ' ' }));

if (Test1.Count > Test2.Count)
{
for (int i = 0; i <= Test1.Count - Test2.Count; i++)
{
Test2.Add("a");
}
}
else if (Test2.Count > Test1.Count)
{
for (int i = 0; i <= Test2.Count - Test1.Count; i++)
{
Test1.Add("a");
}
}

bool[] value = new bool[Test1.Count];
for (int i = 0; i < Test1.Count; i++)
{
string a = Test1[i];
string b = Test2[i];
value[i] = string.Equals(a, b, StringComparison.Ordinal);

}

for (int i = 0; i < value.Length; i++)
{
if (value[i] == false)
{
richTextBox2.SelectionStart = (int)(richTextBox2.Text.IndexOf(Test2[i]));
richTextBox2.SelectionLength = Test2[i].Length;
richTextBox2.SelectionColor = Color.Red;
}
}

Test1.Clear();
Test2.Clear();

}

Its not so professional..but its working except i dont know how to make sure cases where by the First word in both richTextBox is diffrent is properly handled

How to compare text in two rich text boxes

3 solutions

Solution 2

Solution 1

Solution 3

Add your solution here

Preview 0