DataContractSerializer 读取会导致“缺少带有编码的 XML 声明”，知道为什么吗？

Question

我使用

DataContractSerializer

将记录写入 XML 文件。工作没有问题。但当我回读时，我遇到了一个例外：

Loading snapshot failed, An XML declaration with an encoding is required for all non-UTF8 documents

。

有什么想法吗？或者更好的是，我可以配置

XmlTextWriter

来写入该编码信息吗？

写作：

DataContractSerializer serializer = new(typeof(RMonitorSnapshot));
using (XmlTextWriter writer = new(fn, Encoding.Unicode))
{
    writer.Formatting = Formatting.Indented; // indent the Xml so it’s human readable
    serializer.WriteObject(writer, snapshot);
    writer.Flush();
}

阅读：

RMonitorSnapshot? snapshot = null;
DataContractSerializer serializer = new(typeof(RMonitorSnapshot));

try {
    using (FileStream fs = File.Open(fn, FileMode.Open)) {
        snapshot = serializer.ReadObject(fs) as RMonitorSnapshot;
    }
}
catch (Exception ex) {
...  Loading snapshot failed, An XML declaration with an encoding is required for all non-UTF8 documents. 
}

Answer 1

异常原因是少了一行

<?xml version="1.0" encoding="utf-8"?>

如上所述，有两种解决方案：

1. 使用

   XmlWriter

   创建线条：

   using (XmlWriter writer = XmlWriter.Create(fn, settings))

2. 使用

   XmlTextWriter

   并添加

   writer.WriteStartDocument();

感谢以上所有提供帮助的人。