復雜類型的SOAP序列化時出現InvalidOperationException

Question

我遇到了SOAP序列化的問題，找到答案會很棒。 這是一個非常簡單的例子：

public void Test()
{
    StringBuilder sb = new StringBuilder();
    StringWriter writer = new StringWriter(sb);

    SoapReflectionImporter importer = new SoapReflectionImporter();
    XmlTypeMapping map = importer.ImportTypeMapping(typeof(A));
    XmlSerializer serializer = new XmlSerializer(map);
    serializer.Serialize(writer, new A());
}

[Serializable]
public class A
{
    public A()
    {
        BB = new B();
    }

    public int a;

    public B BB;
}
[Serializable]
public class B
{
    public int A1 { get; set; }

    public int A2 { get; set; }
}

如果我運行方法Test（）然后我得到以下異常： System.InvalidOperationException: Token StartElement in state Epilog would result in an invalid XML document.

非常感謝任何幫助。

Answer 1

使用XmlWriter而不是StringWriter並執行writer.WriteStartElement（“root”）;

這將有效：

Stream s = new MemoryStream();
XmlWriter writer = new XmlTextWriter(s, Encoding.UTF8);

SoapReflectionImporter importer = new SoapReflectionImporter();
XmlTypeMapping map = importer.ImportTypeMapping(typeof(A));
XmlSerializer serializer = new XmlSerializer(map);
writer.WriteStartElement("root");
serializer.Serialize(writer, new A());

StreamReader sr = new StreamReader(s);
string data = sr.ReadToEnd();

Answer 2

只是注意，如果流的位置未設置為流的開頭，則上面的示例將不起作用。 像這樣：

Stream s = new MemoryStream();
XmlWriter writer = new XmlTextWriter(s, Encoding.UTF8);

SoapReflectionImporter importer = new SoapReflectionImporter();
XmlTypeMapping map = importer.ImportTypeMapping(typeof(A));
XmlSerializer serializer = new XmlSerializer(map);
writer.WriteStartElement("root");
serializer.Serialize(writer, new A());

s.Position = 0;
StreamReader sr = new StreamReader(s);
string data = sr.ReadToEnd();