如果以某种方式声明 XmlTextWriter，则会出现命名空间重新定义异常

发布于 2024-10-19 10:18:14 字数 1067 浏览 0 评论 0原文

我正在构建一个 XDocument 并使用以下代码将其序列化为 UTF8 字符串：

string xmlString = "";
using (MemoryStream ms = new MemoryStream())
{
  using (XmlWriter xw = new XmlTextWriter(ms, Encoding.UTF8))
  {
    doc.Save(xw);
    xw.Flush();
    StreamReader sr = new StreamReader(ms);
    ms.Seek(0, SeekOrigin.Begin);
    xmlString = sr.ReadToEnd();
  }
}

这工作得很好。

然后我需要切换声明符是否序列化为字符串。我将代码更改为：

string xmlString = "";
using (MemoryStream ms = new MemoryStream())
{
  XmlWriterSettings settings = new XmlWriterSettings()
  {
    OmitXmlDeclaration = !root.IncludeDeclarator,
    Encoding = Encoding.UTF8
  };
  using (XmlWriter xw = XmlTextWriter.Create(ms, settings))
  {
    doc.Save(xw);
    xw.Flush();
    StreamReader sr = new StreamReader(ms);
    ms.Seek(0, SeekOrigin.Begin);
    xmlString = sr.ReadToEnd();
  }
}

这会在 doc.Save(xw) 上引发以下异常：

前缀 '' 无法重新定义 '' 到同一内的 'my_schema_here' 开始元素标记。

我试图弄清楚为什么如果作者是“new”的，则可以保存XDoc，但如果是“.Create”的，则不能保存。有什么想法吗？

乔丹

原文

I am bulding up an XDocument and serializing it to a UTF8 string with the following code:

string xmlString = "";
using (MemoryStream ms = new MemoryStream())
{
  using (XmlWriter xw = new XmlTextWriter(ms, Encoding.UTF8))
  {
    doc.Save(xw);
    xw.Flush();
    StreamReader sr = new StreamReader(ms);
    ms.Seek(0, SeekOrigin.Begin);
    xmlString = sr.ReadToEnd();
  }
}

This worked fine.

I then needed to toggle whether or not the declarator was serialized to the string. I changed the code to this:

string xmlString = "";
using (MemoryStream ms = new MemoryStream())
{
  XmlWriterSettings settings = new XmlWriterSettings()
  {
    OmitXmlDeclaration = !root.IncludeDeclarator,
    Encoding = Encoding.UTF8
  };
  using (XmlWriter xw = XmlTextWriter.Create(ms, settings))
  {
    doc.Save(xw);
    xw.Flush();
    StreamReader sr = new StreamReader(ms);
    ms.Seek(0, SeekOrigin.Begin);
    xmlString = sr.ReadToEnd();
  }
}

This throws the following exception on doc.Save(xw):