SubDocument.BeginUpdateCharacters(DocumentPosition, Int32) Method
Starts modifying properties of the specified number of characters starting at the specified document position.
Namespace: DevExpress.XtraRichEdit.API.Native
Assembly: DevExpress.RichEdit.v23.2.Core.dll
NuGet Packages: DevExpress.RichEdit.Core, DevExpress.Win.Navigation
Declaration
Parameters
| Name | Type | Description |
|---|---|---|
| start | DocumentPosition | A DocumentPosition, specifying the starting document position. |
| length | Int32 | An integer specifying the number of positions to which formatting is applied. |
Returns
| Type | Description |
|---|---|
| CharacterProperties | A CharacterProperties object representing the character formatting of the specified range. |
Remarks
Use the SubDocument.BeginUpdateCharacters and the SubDocument.EndUpdateCharacters paired methods to modify character formatting, such as the CharacterPropertiesBase.FontName, CharacterPropertiesBase.FontSize, CharacterPropertiesBase.Bold, CharacterPropertiesBase.ForeColor etc.
To accomplish this, call the SubDocument.BeginUpdateCharacters method for the specified range, use the returned CharacterProperties interface to modify the required properties and call the SubDocument.EndUpdateCharacters method to finalize the modification.
Note
Make sure that the SubDocument.BeginUpdateCharacters method always has its corresponding SubDocument.EndUpdateCharacters method to ensure proper operation of the control.
The following code snippet changes the font and the color of the selected text.
document.BeginUpdate();
document.AppendText("Normal\nFormatted\nNormal");
document.EndUpdate();
// The target range is the second paragraph
DocumentRange range = document.Paragraphs[1].Range;
// Create and customize an object
// that sets character formatting for the selected range
CharacterProperties cp = document.BeginUpdateCharacters(range);
cp.FontName = "Comic Sans MS";
cp.FontSize = 18;
cp.ForeColor = Color.Blue;
cp.BackColor = Color.Snow;
cp.Underline = UnderlineType.DoubleWave;
cp.UnderlineColor = Color.Red;
// Finalize modifications
// with this method call
document.EndUpdateCharacters(cp);
Related GitHub Examples
The following code snippets (auto-collected from DevExpress Examples) contain references to the BeginUpdateCharacters(DocumentPosition, Int32) method.
Note
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