C# 如何使用 XmlDocument/XmlDeclaration 添加自定义 XmlDeclaration？
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How do I add a custom XmlDeclaration with XmlDocument/XmlDeclaration?
提问by Metro Smurf
I would like to create a custom XmlDeclaration while using the XmlDocument/XmlDeclaration classes in c# .net 2 or 3.
我想在 c# .net 2 或 3 中使用 XmlDocument/XmlDeclaration 类时创建自定义 XmlDeclaration。
This is my desired output (it is an expected output by a 3rd party app):
这是我想要的输出（这是第 3 方应用程序的预期输出）：
<?xml version="1.0" encoding="ISO-8859-1" ?>
<?MyCustomNameHere attribute1="val1" attribute2="val2" ?>
[ ...more xml... ]
Using the XmlDocument/XmlDeclaration classes, it appears I can only create a single XmlDeclaration with a defined set of parameters:
使用 XmlDocument/XmlDeclaration 类，看来我只能使用一组定义的参数创建单个 XmlDeclaration：
XmlDocument doc = new XmlDocument();
XmlDeclaration declaration = doc.CreateXmlDeclaration("1.0", "ISO-8859-1", null);
doc.AppendChild(declaration);
Is there a class other than the XmlDocument/XmlDeclaration I should be looking at to create the custom XmlDeclaration? Or is there a way with the XmlDocument/XmlDeclaration classes itself?
除了 XmlDocument/XmlDeclaration 之外，是否还有其他类我应该查看以创建自定义 XmlDeclaration？或者有没有办法使用 XmlDocument/XmlDeclaration 类本身？
采纳答案by Bradley Grainger
What you are wanting to create is not an XML declaration, but a "processing instruction". You should use the XmlProcessingInstructionclass, not the XmlDeclarationclass, e.g.:
您要创建的不是 XML 声明，而是“处理指令”。您应该使用XmlProcessingInstruction类，而不是XmlDeclaration类，例如：
XmlDocument doc = new XmlDocument();
XmlDeclaration declaration = doc.CreateXmlDeclaration("1.0", "ISO-8859-1", null);
doc.AppendChild(declaration);
XmlProcessingInstruction pi = doc.CreateProcessingInstruction("MyCustomNameHere", "attribute1=\"val1\" attribute2=\"val2\"");
doc.AppendChild(pi);
回答by Oppositional
You would want to append a XmlProcessingInstructioncreated using the CreateProcessingInstructionmethod of the XmlDocument.
您可能希望附加使用XmlDocument的CreateProcessingInstruction方法创建的XmlProcessingInstruction。
Example:
例子：
XmlDocument document = new XmlDocument();
XmlDeclaration declaration = document.CreateXmlDeclaration("1.0", "ISO-8859-1", "no");
string data = String.Format(null, "attribute1=\"{0}\" attribute2=\"{1}\"", "val1", "val2");
XmlProcessingInstruction pi = document.CreateProcessingInstruction("MyCustomNameHere", data);
document.AppendChild(declaration);
document.AppendChild(pi);
