Parameters
- filePath
- The output file path.
- viewState
- The document view state.
- pageRange
- The range of pages that should be saved.
- options
- Options that allow customizing the output images.
The filePath parameter is used as a .NET format string, with current page number (1-based) passed to it as the value to be formatted. Note that if filePath does not contain a format item (such as "{0}"), all pages will be saved into the same file name, the last page overwriting everything else.