我的最终目标是上传rtf文档并将二进制内容存储在表中，然后检索该模板的内容，根据一些预定义的标签替换一些文本，并触发浏览器下载更新的模板。我最初的目标是上传一个rtf文件（工作），通过我的解析方法运行它（没有任何更改），并使用原始模板成功打开下载的文件。现在下面的所有内容都在工作，除了生成的文件已损坏（我不确定我的流是否被正确处理）。我应该深入研究System.IO以更好地理解内存流等，但这是这个项目中我唯一需要做这样的事情的地方，所以我试图找到一个快速的解决方案。
public static Stream ParseFile(Stream fsTemplate)
{
// create MemoryStream to copy template into and modify as needed
MemoryStream doc = new MemoryStream();
// copy template FileStream into document MemoryStream
fsTemplate.CopyTo(doc);
doc.Position = 0;
string docText = string.Empty;
using (StreamReader reader = new StreamReader(doc))
{
// doctText appears to look how I'd expect when I debug
docText = reader.ReadToEnd();
reader.Close();
}
//replace text in 'docText' as neccessary (not yet implemented)
// This is where I'm not really clear what I should be doing differently
var ms = new MemoryStream();
StreamWriter writer = new StreamWriter(ms);
writer.Write(docText);
ms.Position = 0;
return ms;
}
这是我的控制器，它从数据库中检索二进制数据（上传的rtf模板），调用上述方法，并将文件流返回给浏览器
public FileStreamResult Parse(int id)
{
byte[] data = Context.Templates.Find(id).BinaryData;
Stream stream = new MemoryStream(data);
var updatedStream = Tools.ParseFile(stream);
return File(updatedStream, "application/rtf", "temp.rtf");
}
我用这段代码替换了我的StreamWriter，现在它正在按照我的预期工作。我仍然不确定我是否正确处理了我的溪流。
byte[] buffer = Encoding.ASCII.GetBytes(docText);
MemoryStream ms = new MemoryStream(buffer);
完整代码：
public static Stream ParseFile(Stream fsTemplate)
{
// create MemoryStream to copy template into and modify as needed
MemoryStream doc = new MemoryStream();
// copy template FileStream into document MemoryStream
fsTemplate.CopyTo(doc);
doc.Position = 0;
string docText = string.Empty;
using (StreamReader reader = new StreamReader(doc))
{
// doctText appears to look how I'd expect when I debug
docText = reader.ReadToEnd();
reader.Close();
}
//replace text in 'docText' as neccessary (not yet implemented)
byte[] buffer = Encoding.ASCII.GetBytes(docText);
MemoryStream ms = new MemoryStream(buffer);
return ms;
}
答案 0 :(得分：0)
我建议调用writer.Flush（）强制它写入缓冲数据。或者用“使用”包围编写器实例，最后也会这样做。
public static Stream Parse(Stream fsTemplate){...
// This is where I'm not really clear what I should be doing differently
var ms = new MemoryStream();
StreamWriter writer = new StreamWriter(ms);
writer.Write(docText);
writer.Flush(); // <-- here
ms.Position = 0;
答案 1 :(得分：0)
以下是如何完成的。
创建rtf文档并将其另存为AAnRTF.txt 内容：
<div>
This is an rtf document
<div>
这是你的控制器和方法：
public class HomeController : Controller
{
public ActionResult UploadFilePost(string SubmitButton, HttpPostedFileBase file)
{
if (SubmitButton == "Upload RTF")
{
//I use BreazEntities13, you will use what comes out of the EDMX wizard
//EDMX is easy please try it
byte[] byteContent;
Stream aStream = file.InputStream;
MemoryStream memoryStream = new MemoryStream();
aStream.CopyTo(memoryStream);
byteContent = memoryStream.ToArray();
ImportMod imsk = new ImportMod
{
Contents = byteContent,
ContentType = "text/plain"
};
using (BreazEntities13 entity = new BreazEntities13())
{
entity.ImportMods.Add(imsk);
entity.SaveChanges();
}
}
else if (SubmitButton == "Download RTF")
{
//get documnet
ImportMod kit = new ImportMod();
using (BreazEntities13 entity = new BreazEntities13())
{
kit = entity.ImportMods.FirstOrDefault(); //! GETS only the first documument
}
//modify file -credit to other stack o pages
//eg http://stackoverflow.com/questions/9174402/replacing-the-innertext-of-an-xml-node-element
XmlDocument doc = new XmlDocument();
string xml = Encoding.UTF8.GetString(kit.Contents);
doc.LoadXml(xml);
doc.SelectSingleNode("div").InnerText = "Replace text, xmldocument is similiar to rtf or choose a diff type";
byte[] bytes = Encoding.Default.GetBytes(doc.OuterXml);
this.ControllerContext.HttpContext.Response.ClearContent();
this.ControllerContext.HttpContext.Response.ContentType = "text/plain";
this.ControllerContext.HttpContext.Response.AddHeader("content-disposition",
"attachment; filename=" + "AAnRTF.txt");
this.ControllerContext.HttpContext.Response.BinaryWrite(bytes);
this.ControllerContext.HttpContext.Response.End();
}
return View("UploadFile");
}
public ActionResult UploadFile()
{
return View();
}
创建一个表来保存文件：
GO
/****** Object: Table [dbo].[ImportModStarterKit] Script Date: 4/19/2017 10:25:48 AM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[ImportMod](
[Id] [int] IDENTITY(1,1) NOT NULL,
[Contents] [varbinary](max) NULL,
[ContentType] [nvarchar](2048) NULL,
CONSTRAINT [PK_ImportModStarterKit] PRIMARY KEY CLUSTERED
(
[Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
为此表创建一个edmx ADO.NET实体数据模型
以下是您的观点：
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>UploadFile</title>
</head>
<body>
<div>
@using (Html.BeginForm("UploadFilePost",
"Home",
FormMethod.Post,
new { enctype = "multipart/form-data" }))
{
<div class="commonImportPageHeight">
Import Cases
<div class="boxAroundFileUpload">
<input type="file" name="file" id="file" class="uploadFileWidth" /><br>
<input type="submit" name="SubmitButton" value="Upload RTF" />
<br/>
<input type="submit" name="SubmitButton" value="Download RTF" />
<br>
</div>
</div>
}
</div>
</body>
</html>