我试图序列化一个类,将
XML文件写成多个片段,即将该类的每个对象作为单个片段写入,而不使用XML头/根.以下是示例代码：
[Serializable]
public class Test
{
public int X { get; set; }
public String Y { get; set; }
public String[] Z { get; set; }
public test()
{
}
public Test(int x,String y,String[] z)
{
X = x;
Y = y;
Z = z;
}
}
class Program
{
static void Main(string[] args)
{
Test t1 = new Test(1,"t1",new[] { "a","b" });
Test t2 = new Test(2,"t2",new[] { "c","d","e" });
XmlSerializer serializer = new XmlSerializer(typeof(Test));
//using (StreamWriter writer = new StreamWriter(@"f:\test\test.xml"))
{
XmlWriter xmlWriter = XmlWriter.Create(@"f:\test\test.xml",new XmlWriterSettings()
{ConformanceLevel = ConformanceLevel.Fragment,OmitXmlDeclaration = true,Indent = true});
serializer.Serialize(xmlWriter,t1);
serializer.Serialize(xmlWriter,t2);
xmlWriter.Close();
}
}
}
在第一次序列化调用中,我得到了异常：
WriteStartDocument cannot be called on writers created with ConformanceLevel.Fragment
我在这里想念的是什么？
解决方法
这个问题有一个解决方法.在使用序列化程序之前使用xml writer时,将不会写入标头.以下工作正常,但会在xml文件的第一行添加一个空注释标记
改进代码,如oleksa所建议的
static void Main(string[] args)
{
Test t1 = new Test(1,"e" });
XmlSerializer serializer = new XmlSerializer(typeof(Test));
//using (StreamWriter writer = new StreamWriter(@"f:\test\test.xml"))
{
XmlWriter xmlWriter = XmlWriter.Create(@"test.xml",new XmlWriterSettings()
{
ConformanceLevel = ConformanceLevel.Fragment,OmitXmlDeclaration = false,Indent = true,NamespaceHandling = NamespaceHandling.OmitDuplicates
});
xmlWriter.WriteWhitespace("");
serializer.Serialize(xmlWriter,t2);
xmlWriter.Close();
}
}