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RichTextBox.Find Method (String, Int32, RichTextBoxFinds)

Searches the text in a RichTextBox control for a string at a specific location within the control and with specific options applied to the search.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public int Find(
	string str,
	int start,
	RichTextBoxFinds options
)

Parameters

str
Type: System.String
The text to locate in the control.
start
Type: System.Int32
The location within the control's text at which to begin searching.
options
Type: System.Windows.Forms.RichTextBoxFinds
A bitwise combination of the RichTextBoxFinds values.

Return Value

Type: System.Int32
The location within the control where the search text was found.

The Find method searches for the text specified in the str parameter and returns the location of the first character of the search string within the control. If the property returns a negative value, the text string being searched for was not found within the contents of the control. You can use this method to create search functionality that can be provided to the user of the control. You can also use this method to search for text to be replaced with a specific format. For example, if the user entered dates into the control, you could use the Find method to search for all dates in the document and replace them with the appropriate format before using the SaveFile method of the control.

With this version of the Find method, you can specify options that enable you to expand or narrow your search. You can specify options that enable you to match the casing of the search word or to search for entire words instead of partial words. By specifying the RichTextBoxFinds.Reverse enumeration in the options parameter, you can search for text from the bottom of the document to the top instead of the default top to bottom search method. This version of the Find method also enables you to narrow the search for text by selecting a specific starting position within the control's text. This feature can enable you to avoid text that might have already been searched or where the specific text you are searching for is known not to exist. When the RichTextBoxFinds.Reverse value is specified in the options parameter, the value of the start parameter indicates the position where the reverse search will end since the search will start at the bottom of the document when using this version of the Find method.

NoteNote

The Find methods that accept a string as a parameter cannot find text that is contained on more than one line of text within the RichTextBox. Performing such a search will return a value of negative one (-1).

The following code example searches the entire contents of a RichTextBox for the first instance of a search string passed into the text parameter of the method. The search starting location is specified by the start parameter of the method. If the search string is found in the RichTextBox, the method returns the index location of the first character of the found text and highlights the found text; otherwise, it returns a value of -1. The example also specifies options in the search to match the case of the specified search string. The example requires that this method is placed in the class of a Form that contains a RichTextBox named richTextBox1. You can use this example to perform a "Find Next" type of operation. Once an instance of the search text has been found, you can find other instances of the text by changing the value of the start parameter to search at a location beyond the position of the current match.


public int FindMyText(string text, int start)
{
   // Initialize the return value to false by default.
   int returnValue = -1;

   // Ensure that a search string has been specified and a valid start point.
   if (text.Length > 0 && start >= 0) 
   {
      // Obtain the location of the search string in richTextBox1.
      int indexToText = richTextBox1.Find(text, start, RichTextBoxFinds.MatchCase);
      // Determine whether the text was found in richTextBox1.
      if(indexToText >= 0)
      {
         returnValue = indexToText;
      }
   }

   return returnValue;
}



.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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