从 db 加载二进制文件并将其处理为 openxml
我有这样的方法从存储为二进制的数据库加载文档文件，然后用参数替换 customxml 部分。
不知何故，当我将字节转换为 MemoryStream 然后处理它时，它不起作用，我的自定义 xml 部分不会被替换。但如果我使用 FileStream 并从磁盘读取相同的文件，那么它就完美替换了！
MemoryStream 有什么问题？我也无法将 MemoryStream 转换为 FileStream 或创建 Stream 实例等。 有什么建议吗？
private static Stream LoadContent(byte[] content, XmlDocument parameters)
{
//FileStream works perfectly
//Stream fileStream = new FileStream(@"C:\temp\test.docx", FileMode.Open);
Stream documentStream = new MemoryStream();
documentStream.Write(content, 0, content.Length);
//Processes word file, replace custom xml parts with parameters
using (WordprocessingDocument document = WordprocessingDocument.Open(documentStream, true))
{
MainDocumentPart mainPart = document.MainDocumentPart;
Stream partStream = mainPart.CustomXmlParts.First().GetStream();
using (XmlWriter xmlWriter = XmlWriter.Create(partStream, new XmlWriterSettings { CloseOutput = false }))
{
parameters.WriteTo(xmlWriter);
xmlWriter.Flush();
}
mainPart.Document.Save();
}
return documentStream;
}
I have such method to load document file from db that is stored as binary and then replace customxml parts with parameters.
Somehow when i convert byte into MemoryStream then process it doesn't work, my custom xml parts are not replaced. But if i use FileStream and read same file from disk then it replaced perfectly!
What is wrong with MemoryStream? i can't also cast MemoryStream to FileStream or create instrance of Stream or etc..
Any suggestion?
private static Stream LoadContent(byte[] content, XmlDocument parameters)
{
//FileStream works perfectly
//Stream fileStream = new FileStream(@"C:\temp\test.docx", FileMode.Open);
Stream documentStream = new MemoryStream();
documentStream.Write(content, 0, content.Length);
//Processes word file, replace custom xml parts with parameters
using (WordprocessingDocument document = WordprocessingDocument.Open(documentStream, true))
{
MainDocumentPart mainPart = document.MainDocumentPart;
Stream partStream = mainPart.CustomXmlParts.First().GetStream();
using (XmlWriter xmlWriter = XmlWriter.Create(partStream, new XmlWriterSettings { CloseOutput = false }))
{
parameters.WriteTo(xmlWriter);
xmlWriter.Flush();
}
mainPart.Document.Save();
}
return documentStream;
}
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在将数据写入内存流之后并再次读取之前，您可能想要尝试将内存流的“位置”属性设置为 0。
或者，您也可以将字节数组传递给内存流的构造函数，而不是调用 writer。
编辑
根据 MSDN，我看到“Document.Save”方法将刷新流以允许正确保存。 （http://msdn.microsoft.com/en-us/library/cc840441。 aspx ）。
但是，MemoryStream 不会对刷新执行任何操作（ http://msdn .microsoft.com/en-us/library/system.io.memorystream.flush.aspx）。
您可以尝试创建一个新的 MemoryStream，然后将其作为参数传递给“Document.Save”方法。
You might want to try to set the 'Position' propery of the memorystream to 0 after writing data to it and before reading it again.
Alernatively you can also pass the byte array to the constructor of the memorystream instead of calling writer.
edit
I see according to MSDN that the 'Document.Save' method will flush the stream to allow propper saving. ( http://msdn.microsoft.com/en-us/library/cc840441.aspx ).
However MemoryStream wont do anything on flush ( http://msdn.microsoft.com/en-us/library/system.io.memorystream.flush.aspx ).
You could try to create a new MemoryStream and then pass that as a parameter to the 'Document.Save' method.