VC read Excel documents, mostly online using ODBC or OLE manner read, But both methods have limitations, primitive code in Excel file format on the basis of the preparation of code from the bottom.
VC读取Excel文件，网上大多用odbc或ole方式进行读取，但这两种方法都具有局限性，本原码在分析Excel文件格式的基础上从底层编写代码。
This method returns a byte array which you can then save to an output file, such as an image file or an Excel spreadsheet, depending on the requested format.
该方法返回一个可以在以后保存到输出文件的字节数组；取决于请求的格式，输出文件可以是图形文件或Excel电子表格。
When you save an Excel spreadsheet in XML format, all the data and the pivot table parameters are stored in the XML file.
以xml格式保存Excel电子表格时，所有数据和pivot表参数都存储在XML文件中。
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