我试图序列化一个类,将XML文件作为多个片段写入,即,将类的每个对象写为单独的片段,没有XML头/根。下面是一个示例代码:
[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:testtest.xml"))
{
XmlWriter xmlWriter = XmlWriter.Create(@"f:testtest.xml",
new XmlWriterSettings()
{ConformanceLevel = ConformanceLevel.Fragment,
OmitXmlDeclaration = true,
Indent = true});
serializer.Serialize(xmlWriter, t1);
serializer.Serialize(xmlWriter, t2);
xmlWriter.Close();
}
}
}
在第一次调用序列化时,我得到异常:
WriteStartDocument cannot be called on writers created with ConformanceLevel.Fragment
我在这里错过了什么?
这个问题
有一个解决方法。如果在使用序列化程序之前使用了 xml 编写器,则不会写入标头。以下内容确实有效,但会在 xml 文件的第一行添加一个空注释标记
根据 Oleksa 的建议改进代码
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:testtest.xml"))
{
XmlWriter xmlWriter = XmlWriter.Create(@"test.xml",
new XmlWriterSettings()
{
ConformanceLevel = ConformanceLevel.Fragment,
OmitXmlDeclaration = false,
Indent = true,
NamespaceHandling = NamespaceHandling.OmitDuplicates
});
xmlWriter.WriteWhitespace("");
serializer.Serialize(xmlWriter, t1);
serializer.Serialize(xmlWriter, t2);
xmlWriter.Close();
}
}