void lvnf_SelectedIndexChanged(object sender, EventArgs e)
{
results = new List<int>();
richTextBox1.Text = File.ReadAllText(listViewCostumControl1.lvnf.Items[listViewCostumControl1.lvnf.SelectedIndices[0]].Text);
FileInfo fi = new FileInfo(listViewCostumControl1.lvnf.Items[listViewCostumControl1.lvnf.SelectedIndices[0]].Text);
lblfilesizeselected.Text = ExtensionMethods.ToFileSize(fi.Length);
lblfilesizeselected.Visible = true;
filePath = Path.GetDirectoryName(fi.FullName);
string words = textBox1.Text;
string[] splittedwords = words.Split(new string[] { ",," }, StringSplitOptions.None);
foreach (string myword in splittedwords)
{
HighlightPhrase(richTextBox1, myword, Color.Yellow);
lblviewerselectedfile.Text = results.Count.ToString();
lblviewerselectedfile.Visible = true;
if (results.Count > 0)
{
numericUpDown1.Maximum = results.Count;
numericUpDown1.Enabled = true;
richTextBox1.SelectionStart = results[(int)numericUpDown1.Value - 1];
richTextBox1.ScrollToCaret();
}
}
}
This is the line that make the split :
string[] splittedwords = words.Split(new string[] { ",," }, StringSplitOptions.None);
The problem is if I'm typing the textBox1 for example sadsdss,,s,,form1,,,,,,,,f,,dd,,,,,,
Then all the places that have more then two commas it count as empty string when highlighting the words :
void HighlightPhrase(RichTextBox box, string phrase, Color color)
{
int pos = box.SelectionStart;
string s = box.Text;
for (int ix = 0; ;)
{
int jx = s.IndexOf(phrase, ix, StringComparison.CurrentCultureIgnoreCase);
if (jx < 0)
{
break;
}
else
{
box.SelectionStart = jx;
box.SelectionLength = phrase.Length;
box.SelectionColor = color;
ix = jx 1;
results.Add(jx);
}
}
box.SelectionStart = pos;
box.SelectionLength = 0;
}
The exception is on the line :
int jx = s.IndexOf(phrase, ix, StringComparison.CurrentCultureIgnoreCase);
System.ArgumentOutOfRangeException: 'Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: startIndex'
because the phrase is empty string ""
what I want to do is that every place there are more then two commas like ,,, count it as string as word even if the user type s,,1,,form1,,,,,,
so the words s 1 form1 and ,,,,,, all should be counted as results and words that should be highlighted.
CodePudding user response:
If you want to remove empty entries, just do it with a help of StringSplitOptions.RemoveEmptyEntries option:
string[] splittedwords = words.Split(
new string[] { ",," },
StringSplitOptions.RemoveEmptyEntries);
Another posibility is to query with a help of Linq, which can be helpful if you want to exclude (filter out) some words, e.g.
using System.Linq;
...
string[] splittedwords = words
.Split(new string[] { ",," }, StringSplitOptions.None)
.Where(item => !string.IsNullOrWhiteSpace(item))
.ToArray();