// perform search and replace using Selection properties
void replaceUsingSelection_Click(object sender, EventArgs e)
{
MessageBox.Show("Replacing 'work' with 'labor' using Selection.");
// re-load document
this.c1Editor1.LoadXml(Properties.Resources.tesla, null);
// strings to search and replace
string search = "work";
string replace = "labor";
// do the work
int count = 0;
int previousStart = 0;
C1TextRange range = this.c1Editor1.CreateRange();
for (int start = 0; ; start += search.Length)
{
// get text (notice new line handling)
string txt = this.c1Editor1.Text;
txt = txt.Replace("\r\n", "\n");
// find text, break when done
start = txt.IndexOf(search, start, StringComparison.OrdinalIgnoreCase);
if (start < 0)
{
break;
}
// select match
// recommended way (better performance): move range relative to its current position
range.Move(start - previousStart, search.Length);
range.Select();
// not recommended way (slower): using the Select method
//this.c1Editor1.Select(start, search.Length);
// tell user we're about to replace
string msg = string.Format("About to replace instance {0}.", ++count);
if (MessageBox.Show(msg, "Replace", MessageBoxButtons.OKCancel) == DialogResult.Cancel)
{
break;
}
// second part of the code moving range
range.Text = replace;
range.ApplyTag("strong");
previousStart = start;
// second part of the code using the Select method
//this.c1Editor1.Selection.Text = replace;
//this.c1Editor1.Selection.ApplyTag("strong");
}
// done
MessageBox.Show(string.Format("Done, {0} instances found.", count));
}
//-------------------------------------------------------------------------------------
#region ** implementation
void UpdateSyntax()
{
// get text
string text = c1Editor1.Text;
// remove formatting
C1TextRange rng = c1Editor1.CreateRange(0, text.Length);
rng.RemoveTag("span");
// apply all syntax descriptors
foreach (SyntaxDescriptor sd in GetSyntaxDescriptors())
{
// initialize
int start = 0;
rng.Start.Move(MoveUnit.Character, -50000000);
rng.End.MoveTo(rng.Start);
// if there's a group called 'match', use it;
// otherwise, use the first one
int gIndex = sd.Regex.GroupNumberFromName("match");
if (gIndex < 0)
{
gIndex = 0;
}
// find all matches for this descriptor
for (Match match = sd.Regex.Match(text); match.Success; match = match.NextMatch())
{
// apply descriptor style for this match
Group g = match.Groups[gIndex];
foreach (Capture c in g.Captures)
{
rng.Move(c.Index - start, c.Length);
// avoid nested spans (e.g. reserved words in comments, etc)
if (rng.Node.ParentNode.Name != "span")
{
rng.ApplyClass(sd.ClassName, C1StyleType.Character);
}
start = c.Index;
}
}
}
}