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The File Editor (FormEdit) is the built-in document editor of Explorador de Archivos. It opens from the main toolbar and presents two views depending on the file type: a DataGridView for tabular formats (CSV and Excel) and a RichTextBox (rtbContenido) for text-based formats. PDF files are rendered in an embedded Microsoft WebView2 control. The editor tracks the active file path in _currentFile and the detected format in _currentFileType, so the Guardar button always writes back using the same format that was loaded.

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Supported Formats

FormatExtensionView ModeEditable
CSV.csvGrid (DataGridView)Yes
Excel.xlsx / .xlsGrid (DataGridView)Yes (.xlsx only)
Word.docx / .docRich Text (RichTextBox)Yes (.docx only)
PowerPoint.pptx / .pptRich Text (slide text extracted)Read-only
Plain Text.txtRich Text (RichTextBox)Yes
JSON.jsonRich Text with syntax highlightingYes
XML.xmlRich Text with syntax highlightingYes
PDF.pdfWebView2 browser renderRead-only

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Opening a File

1

Click Cargar

The Cargar button (btnCargar_Click) opens an OpenFileDialog with a multi-format filter that lists every supported extension. The full path is stored in _currentFile.
2

Extension detection

The app reads Path.GetExtension(_currentFile).ToLower() and branches to the matching private loader method. There is no content sniffing — the extension is authoritative.
3

Loading into the correct view

  • CSV (CargarCSV) — splits the first line on commas to create DataGridView columns, then adds one row per subsequent line.
  • Excel (CargarExcel) — opens the .xlsx file with DocumentFormat.OpenXml.Packaging.SpreadsheetDocument; the first Row becomes column headers, remaining rows become data rows. Shared-string-table values are resolved via GetCellValue.
  • Word (CargarWord) — extracts text from word/document.xml inside the .docx ZIP archive by reading all w:t nodes and concatenating their InnerText. The result is placed in rtbContenido.
  • PowerPoint (CargarPowerPoint) — iterates ppt/slides/slide*.xml entries in sorted order, extracts a:t text nodes per slide, and formats them with a --- Diapositiva N --- heading.
  • TXT (CargarTexto) — reads the entire file with File.ReadAllText (UTF-8) into rtbContenido. Font is set to Consolas 11 pt on a dark background (RGB(30, 30, 30)).
  • JSON (CargarJSON) — reads the file as text and applies AplicarColoreado_JSON for syntax highlighting: braces/brackets in amber, strings in green, numbers in blue, true/false/null in orange.
  • XML (CargarXML) — reads the file as text and applies AplicarColoreado_XML: tags in steel blue, attribute names in light blue, attribute values in brownish orange, comments in green.
  • PDF (CargarPDF) — hides rtbContenido, shows the WebView2 control, awaits EnsureCoreWebView2Async, and navigates to the file using an absolute file:// URI.

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Editing

For grid-based formats (CSV and Excel), the DataGridView is configured with AllowUserToAddRows = true, AllowUserToDeleteRows = true, and ReadOnly = false. Users can click any cell to edit in place, press Delete on a selected row to remove it, or use the blank bottom row to append new records. For text-based formats (TXT, JSON, XML, and Word), rtbContenido is fully writable. The JSON and XML syntax highlighting is applied once on load; it is not re-evaluated while typing. For Word documents, the text is extracted as plain paragraphs — inline formatting such as bold or tables is not preserved in the editor view.

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Saving

Clicking Guardar (btnGuardar_Click) dispatches to the format-specific writer:
  • CSV (GuardarCSV) — iterates DataGridView columns for the header row, then iterates rows; each cell value is double-quoted, with internal quotes escaped as "". The file is overwritten with File.WriteAllText (UTF-8).
  • Excel (GuardarExcel) — copies the original file to a .backup sidecar and a temp file, opens the temp file with SpreadsheetDocument.Open(…, isEditable: true), clears all rows from the active SheetData, writes the header row and all data rows as CellValues.String cells with explicit CellReference addresses (A1, B1, …), saves, then atomically replaces the original. The backup is deleted on success or restored on failure.
  • Word (GuardarWord) — copies the original to a .backup and a temp file, opens the temp file as a ZipArchive, reads word/document.xml, removes all existing w:t nodes, creates a new w:p→w:r→w:t paragraph for each line in rtbContenido, replaces the ZIP entry, then atomically replaces the original.
  • TXT / JSON / XML (GuardarTexto) — calls File.WriteAllText(_currentFile, rtbContenido.Text, Encoding.UTF8).
PDF editing is not supported. Clicking Guardar while a PDF is loaded displays an informational message and takes no action. PDFs are rendered read-only via the embedded Microsoft WebView2 control.
PowerPoint editing is not supported. Only the plain text content of each slide is extracted for review. Clicking Guardar while a PowerPoint is loaded displays a message directing you to Microsoft PowerPoint for editing.

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