ASP.NET、Streamwriter、Filestream - 0 字节文件
这有效：
using (StreamWriter stw = new StreamWriter(Server.MapPath("\\xml\\file.xml")))
{
stw.Write(xmlEncStr);
}
这会创建一个空文件：
using (FileStream file = new FileStream(Server.MapPath("\\xml\\file.xml"), FileMode.CreateNew))
{
using (StreamWriter sw = new StreamWriter(file))
{
sw.Write(xmlEncStr);
}
}
我尝试使用 FileStream 构造函数并尝试刷新，但仍然得到一个零字节文件。我正在编写的字符串是一个简单的base64编码的ascii字符串，没有特殊字符。
我知道我可以使用第一个示例，但为什么第二个示例不起作用？
更新
这不是 Filestream/StreamWriter 问题 - 这是变量命名问题。我更正了上面的代码，所以现在两个版本都可以工作。我原来有：
StreamWriter strw = new StreamWriter(file)
This works:
using (StreamWriter stw = new StreamWriter(Server.MapPath("\\xml\\file.xml")))
{
stw.Write(xmlEncStr);
}
This creates an empty file:
using (FileStream file = new FileStream(Server.MapPath("\\xml\\file.xml"), FileMode.CreateNew))
{
using (StreamWriter sw = new StreamWriter(file))
{
sw.Write(xmlEncStr);
}
}
I tried playing around with the FileStream constructor and tried flushing and I still get a zero byte file. The string I am writing is a simple base64 encoded ascii string with no special characters.
I know I can use the first example, but why won't the second work?
Update
This wasn't a Filestream/StreamWriter problem - it was a variable naming problem. I corrected the code above, so now both versions work. I originally had:
StreamWriter strw = new StreamWriter(file)
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评论（2）
您可以稍微缩短代码：
MapPath方法还接受相对路径或虚拟路径，并将其转换为服务器上相应的物理路径。\\xml\\file.xml不是以上内容。它可能应该是：~/xml/file.xml。You could shorten your code a bit:
Also the
MapPathmethod accepts a relative or virtual path and converts it to the corresponding physical path on the server.\\xml\\file.xmlis non of the above. It probably should be:~/xml/file.xml.不可重现。
这不应该是 ASP.NET 问题，第二种形式应该可以工作（提供 sw==strw ）。
但是，如果文件已存在，
FileMode.CreateNew将会失败，因此，如果您使用固定的文件名，并且如果它是在之前的尝试中作为空文件创建的，那么这就可以解释症状。但@Darin Dimitrov 提供了更好的选择。
Not reproducable.
It shouldn't be an ASP.NET issue and the second form ought to work (provided sw==strw ).
But
FileMode.CreateNewwill fail if the file already exists, so if you use a fixed filename, and if it was created during an earlier attempt as an empty file then that would explain the symptoms.But @Darin Dimitrov provides a better alternative.