我有一个问题:我想序列化一个xml(20GB(,但我得到一个out of memory
异常。
你对此有什么建议吗?
我拥有的代码如下:
public static string Serialize(object obj)
{
string retval = string.Empty;
if (null!= obj)
{
StringBuilder sb = new StringBuilder();
using (XmlWriter writer = XmlWriter.Create(sb, new XmlWriterSettings() { OmitXmlDeclaration = true }))
{
XmlSerializer serializer = new XmlSerializer(obj.GetType());
// We are ommitting the namespace to simplifying passing as parameter
XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
ns.Add("", "");
serializer.Serialize(writer, obj);
}
retval = sb.ToString();
}
return retval;
}
> 20 GB 永远不会用作string
(通过 StringBuilder
(;即使启用了<gcAllowVeryLargeObjects>
,string
的最大理论长度也只是其中的一小部分。
如果你想要大量的数据,你需要使用类似文件(或者基本上:一个不MemoryStream
Stream
(作为后端。
我还要说xml对于大数据来说是一个糟糕的选择。如果您没有严格绑定到 xml,我强烈建议您查看替代工具(如果可以选择,我很乐意提供建议(。
但就目前而言:
string path = "my.xml";
XmlWriterSettings settings = ...
using (XmlWriter writer = XmlWriter.Create(path, settings))
{
// ...
}
或者,如果您实际上正在与插座等交谈:
Stream stream = ...
XmlWriterSettings settings = ...
using (XmlWriter writer = XmlWriter.Create(stream, settings))
{
// ...
}
你可能有一个列表可以分块完成
public static void Serialize(List<MyClass> myClasses)
{
string retval = string.Empty;
if (myClasses != null)
{
using (StreamWriter sWriter = new StreamWriter("filename", false))
{
foreach (MyClass myClass in myClasses)
{
StringBuilder sb = new StringBuilder();
using (XmlWriter writer1 = XmlWriter.Create(sb, new XmlWriterSettings() { OmitXmlDeclaration = true }))
{
XmlSerializer serializer = new XmlSerializer(myClass.GetType());
// We are ommitting the namespace to simplifying passing as parameter
XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
ns.Add("", "");
serializer.Serialize(writer1, myClass);
}
sWriter.Write(sb.ToString());
}
}
}
}