how to compare eachline in a richtextbox with an hashtable?

vishnu krishnan

16y10.1kVisual Basic .NET

how to compare eachline in a richtextbox with an hashtable? if match write in a text file

plz help...........

14 Replies

Know the answer? Post it — somebody with the same question will find it here.

vishnu krishnan16y ago
sir this replace not working
vishnu krishnan16y ago
sir how to check each line taking from the richtextbox with a regular expression
Felipe Ramos16y ago
A simple replace should take care of it; below you will replace empty spaces with string.Empty

richTextBox1.Text = richTextBox1.Text.Replace(" ", string.Empty);
vishnu krishnan16y ago
thank u sir, thank u

i have another simple problem, i expect ur idea.plz.....
here i am loading a program into richtext box

but in the richtextbox contain, white space between lines, so how will remove this ..

example

#include
int main()
{
(space)int a,b;
}
i want to remove i show in above code(space) not space between int and main.
Felipe Ramos16y ago
No, you can't write to a file with a messagebox. You can do something like below code and still show the messagebox for confirmation.

   private void CreateArray()
   {
   Hashtable hash = new Hashtable();
   hash.Add("1", "int");
   hash.Add("2", "float");

   using (System.IO.StreamWriter writer = new System.IO.StreamWriter("C:test.txt", false))
   {
   using (System.IO.StringReader reader = new System.IO.StringReader(richTextBox1.Text))
   {
   while (reader.Peek() > 0)
   {
   string line = reader.ReadLine();

   if (hash.ContainsValue(line))
   {
   writer.WriteLine(line);
   // Show MessageBox
   }
   }
   }
   }
   }
vishnu krishnan16y ago
i can show that in a message box, but i can't in file,

plz chk this.............................
private void CreateArray()
        {
            Hashtable hash = new Hashtable();
            hash.Add("1", "int");
            hash.Add("2", "float");

            using (System.IO.StringReader reader = new System.IO.StringReader(richTextBox1.Text))
            {

                while (reader.Peek() > 0)
                {
                    string line = reader.ReadLine();

                        if (hash.ContainsValue(line))
                        {
                            MessageBox.Show(line);
                        }

                }
            }
        }

can u change write to a file with messagebox....
if u get plz let me knw ........
Felipe Ramos16y ago
Instead of being true
using (System.IO.StreamWriter writer = new System.IO.StreamWriter("C:test.txt", true))
change it to false
using (System.IO.StreamWriter writer = new System.IO.StreamWriter("C:test.txt", false))
vishnu krishnan16y ago
i got it, but it append with previous information, how to disable that?
vishnu krishnan16y ago
plz chk this...
this nothing write into the file...

StreamWriter writer = new StreamWriter("D:\\help.txt", true);
            using (System.IO.StringReader reader = new System.IO.StringReader(richTextBox1.Text))
            {
                while (reader.Peek() > 0)
                {
                    string line = reader.ReadLine();
                    if (hash.ContainsValue(line))
                    {

                        writer.WriteLine(line);
                    }
                }
            }
        }
Felipe Ramos16y ago
Put this under Write to file

   using (System.IO.StreamWriter writer = new System.IO.StreamWriter("C:test.txt", true))
   {
   writer.WriteLine("whatever you want");
   }

this will open a test.txt file at that location and append to it if it already contains information.
vishnu krishnan16y ago
i tried this, bt nothing write into the file....
help?
Felipe Ramos16y ago
The reader is taking the entire text in your RichTextBox control and giving you an interface to read each line. In the code you will put the reader in a while look to read each line till the end of the file. When you have the current line, you will check your hash collection to see if it contains the line in one of its values. Do you have other questions?
vishnu krishnan16y ago
plz specify more
Felipe Ramos16y ago
There are you ways, the first is grabbing the Text property and splitting it on the new line scape sequence. The second is the one use below, by using the StringReader object you don't have to split since it will do it for you and will give you a nice interface to read line by line.

   using (System.IO.StringReader reader = new System.IO.StringReader(richTextBox1.Text))
   {
   while (reader.Peek() > 0)
   {
   string line = reader.ReadLine();
   if (hash.ContainsValue(line))
   {
   // Write to file
   }
   }
   }