Index and length must refer to a location within the string. Parameter name: length

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I declared Some Special Characters :

C#

private Dictionary<string, string> GetDic = new Dictionary<String, String>();

and in Constructor

C#

GetDic.Add("Oem1",";");
GetDic.Add("Tab", "Tab");
GetDic.Add("Space", "Space");

i have a richtextbox and a textbox.. what i am trying to do is if user start typing in richtextbox the same value start visble in textbox but if user pressess TAB / SPACE / ; textbox text will gets cleared and after these special chars if user start typing again the new value will be in textbox as above i said. And for these my code is..

C#

private void richTextBox1_KeyUp(object sender, KeyEventArgs e)
        {
            //MessageBox.Show(e.KeyData.ToString());
            try
            {
                if (GetDic.ContainsKey(e.KeyData.ToString()) || e.KeyCode == Keys.Enter || e.KeyCode == Keys.OemPeriod)
                {
                    //MessageBox.Show("Matching");
                    textBox1.Text = string.Empty;
                    startIndex = -1;
                    endIndex = 0;
                }
                else
                {
                    if (startIndex <0)
                    {
                        startIndex = richTextBox1.Text.Length - 1;
                        if (startIndex < 0)
                        {
                            startIndex = 0;
                        }
                    }
                    endIndex +=1;
                    if (endIndex < 0)
                    {
                        endIndex = 0;
                    }
                       textBox1.Text = richTextBox1.Text.Substring(startIndex, endIndex);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

Error I am Getting in same line and in new line too..

SQL

Index and length must refer to a location within the string.
Parameter name: length

Please Give Me some help Thank you....

Posted 10-Jun-13 20:38pm

Anjanee Kumar Singh

Updated 11-Jun-13 22:55pm

v2

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Comments

Anjanee Kumar Singh 12-Jun-13 2:44am

Pls tell me if my question is not so clear because i m waiting for som answer...

Thank you...

Tom Wauters 12-Jun-13 5:02am

Do you really need to use a Dictionary?

Anjanee Kumar Singh 12-Jun-13 5:04am

I was told to use this...

2 solutions

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**Zoltán Zörgő** · Accepted Answer · 2013-06-11T23:02:00

Solution 1

It is quite clear: the String.Substring[^] method expects startindex and length not startindex and endindex.

Posted 11-Jun-13 23:02pm

Zoltán Zörgő

Updated 11-Jun-13 23:04pm

v2

Comments

Anjanee Kumar Singh 12-Jun-13 5:06am

Sir i am reading text after every special character i.e defined in (GetDic) . that why i use startindex and endindex
but i am getting this error on pressing all the keys excepts pressing alphabet key of keyboard

Zoltán Zörgő 12-Jun-13 5:20am

That makes no difference - index is not length! Put a breakpoint at textBox1.Text = richTextBox1.Text.Substring(startIndex, endIndex); and see what are in the three values.

Anjanee Kumar Singh 12-Jun-13 5:19am

by putting length on the place of endIndex getting error
Index and length must refer to a location within the string.

Zoltán Zörgő 12-Jun-13 5:21am

It is about the value! If you think of index you mean index, if you think of length, you can't think of index.
Debug and see!!!!

Anjanee Kumar Singh 12-Jun-13 5:37am

While dubug it's not giving me any error. But when i start typing very fast at some point it giving me same error..

Anjanee Kumar Singh 12-Jun-13 5:56am

With The Help Of ur suggestion i got my main problem in codeing ....Thank You..

Tom Wauters · Accepted Answer · 2013-06-11T23:49:00

This might be it, but the key value pairs in your dictionary are not correct.
The problem of your error is what Zoltan says.

C#

if (GetDic.ContainsKey(e.KeyData.ToString()) || e.KeyCode == Keys.Enter || e.KeyCode == Keys.OemPeriod)
              {
                  //MessageBox.Show("Matching");
                  textBox1.Text = string.Empty;
                  startIndex += endIndex+1;
                  endIndex = 0;
              }
              else
              {
                  endIndex++;
                  textBox1.Text = richTextBox1.Text.Substring(startIndex, endIndex);
              }