Question

我正在实现一个自定义xmlwriter，我想省略任何具有特定名称的元素，例如<ABC>。

我该怎么做？我感觉我可能需要像这样覆盖WriteStartElement方法：

public override void WriteStartElement(string prefix, string localName, string ns)
{

    if (localName.Equals("ABC")) 
    {
        return;
    }
    base.WriteStartElement(prefix, localName, ns);
}

我是否还需要覆盖WriteEndElement方法？如何告诉WriteEndElement方法跳过编写结束</ABC>标记？我可以检查localName方法中的WriteEndElement似乎没有参考......？

Answer 1

在我之前编写的一些示例代码中找到了这个。它维护一个下推式堆栈，以确定是否要编写元素结束，这就是你需要做的事情：

<<<$pass  sudo -S -p "" bash -c "cd; pwd"

通过调用XmlWriter.Create()来包装您将照常创建的public class ElementSkippingXmlTextWriter : XmlWriterProxy { readonly Stack<bool> stack = new Stack<bool>(); readonly Func<string, string, int, bool> filter; readonly Func<string, string, int, string> nameEditor; readonly bool filterChildren; public ElementSkippingXmlTextWriter(XmlWriter writer, Func<string, string, int, bool> filter, bool filterChildren) : this(writer, filter, null, filterChildren) { } public ElementSkippingXmlTextWriter(XmlWriter writer, Func<string, string, int, bool> filter, Func<string, string, int, string> nameEditor, bool filterChildren) : base(writer) { this.filter = filter ?? delegate { return true; }; this.nameEditor = nameEditor ?? delegate(string localName, string ns, int depth) { return localName; }; this.filterChildren = filterChildren; } protected override bool IsSuspended { get { if (filterChildren) { if (!stack.All(b => b)) return true; } else { if (stack.Count > 0 && !stack.Peek()) return true; } return base.IsSuspended; } } public override void WriteStartElement(string prefix, string localName, string ns) { var write = filter(localName, ns, stack.Count); var newLocalName = nameEditor(localName, ns, stack.Count); if (write) base.WriteStartElement(prefix, newLocalName, ns); stack.Push(write); } public override void WriteEndElement() { if (stack.Pop()) base.WriteEndElement(); } } public class XmlWriterProxy : XmlWriter { readonly XmlWriter baseWriter; public XmlWriterProxy(XmlWriter baseWriter) { if (baseWriter == null) throw new ArgumentNullException(); this.baseWriter = baseWriter; } protected virtual bool IsSuspended { get { return false; } } public override void Close() { baseWriter.Close(); } public override void Flush() { baseWriter.Flush(); } public override string LookupPrefix(string ns) { return baseWriter.LookupPrefix(ns); } public override void WriteBase64(byte[] buffer, int index, int count) { if (IsSuspended) return; baseWriter.WriteBase64(buffer, index, count); } public override void WriteCData(string text) { if (IsSuspended) return; baseWriter.WriteCData(text); } public override void WriteCharEntity(char ch) { if (IsSuspended) return; baseWriter.WriteCharEntity(ch); } public override void WriteChars(char[] buffer, int index, int count) { if (IsSuspended) return; baseWriter.WriteChars(buffer, index, count); } public override void WriteComment(string text) { if (IsSuspended) return; baseWriter.WriteComment(text); } public override void WriteDocType(string name, string pubid, string sysid, string subset) { if (IsSuspended) return; baseWriter.WriteDocType(name, pubid, sysid, subset); } public override void WriteEndAttribute() { if (IsSuspended) return; baseWriter.WriteEndAttribute(); } public override void WriteEndDocument() { if (IsSuspended) return; baseWriter.WriteEndDocument(); } public override void WriteEndElement() { if (IsSuspended) return; baseWriter.WriteEndElement(); } public override void WriteEntityRef(string name) { if (IsSuspended) return; baseWriter.WriteEntityRef(name); } public override void WriteFullEndElement() { if (IsSuspended) return; baseWriter.WriteFullEndElement(); } public override void WriteProcessingInstruction(string name, string text) { if (IsSuspended) return; baseWriter.WriteProcessingInstruction(name, text); } public override void WriteRaw(string data) { if (IsSuspended) return; baseWriter.WriteRaw(data); } public override void WriteRaw(char[] buffer, int index, int count) { if (IsSuspended) return; baseWriter.WriteRaw(buffer, index, count); } public override void WriteStartAttribute(string prefix, string localName, string ns) { if (IsSuspended) return; baseWriter.WriteStartAttribute(prefix, localName, ns); } public override void WriteStartDocument(bool standalone) { baseWriter.WriteStartDocument(standalone); } public override void WriteStartDocument() { baseWriter.WriteStartDocument(); } public override void WriteStartElement(string prefix, string localName, string ns) { if (IsSuspended) return; baseWriter.WriteStartElement(prefix, localName, ns); } public override WriteState WriteState { get { return baseWriter.WriteState; } } public override void WriteString(string text) { if (IsSuspended) return; baseWriter.WriteString(text); } public override void WriteSurrogateCharEntity(char lowChar, char highChar) { if (IsSuspended) return; baseWriter.WriteSurrogateCharEntity(lowChar, highChar); } public override void WriteWhitespace(string ws) { if (IsSuspended) return; baseWriter.WriteWhitespace(ws); } }，并过滤XmlWriter委托返回filter的元素（以及可选的子项） }。

注意 - 未经过充分测试。

自定义xmlWriter跳过某个元素？

1 个答案: