如何读取和写入编码的文档 (LINQ to XML)

若要创建编码的 XML 文档,请向 XML 树中添加一个 XDeclaration,将编码设置为需要的代码页名称。

WebName 返回的任何值都是有效值。

如果您读取编码的文档,则要将 Encoding 属性设置为该代码页名称。

如果将 Encoding 设置为一个有效的代码页名称,则 LINQ to XML 将用指定的编码进行序列化。

示例:创建两个具有不同编码的文档并识别编码。

下面的示例创建两个文档,一个文档使用 utf-8 编码,另一个使用 utf-16 编码。 然后,该示例加载这两个文档并将编码输出到控制台。

Console.WriteLine("Creating a document with utf-8 encoding");
XDocument encodedDoc8 = new XDocument(
    new XDeclaration("1.0", "utf-8", "yes"),
    new XElement("Root", "Content")
);
encodedDoc8.Save("EncodedUtf8.xml");
Console.WriteLine("Encoding is:{0}", encodedDoc8.Declaration.Encoding);
Console.WriteLine();

Console.WriteLine("Creating a document with utf-16 encoding");
XDocument encodedDoc16 = new XDocument(
    new XDeclaration("1.0", "utf-16", "yes"),
    new XElement("Root", "Content")
);
encodedDoc16.Save("EncodedUtf16.xml");
Console.WriteLine("Encoding is:{0}", encodedDoc16.Declaration.Encoding);
Console.WriteLine();

XDocument newDoc8 = XDocument.Load("EncodedUtf8.xml");
Console.WriteLine("Encoded document:");
Console.WriteLine(File.ReadAllText("EncodedUtf8.xml"));
Console.WriteLine();
Console.WriteLine("Encoding of loaded document is:{0}", newDoc8.Declaration.Encoding);
Console.WriteLine();

XDocument newDoc16 = XDocument.Load("EncodedUtf16.xml");
Console.WriteLine("Encoded document:");
Console.WriteLine(File.ReadAllText("EncodedUtf16.xml"));
Console.WriteLine();
Console.WriteLine("Encoding of loaded document is:{0}", newDoc16.Declaration.Encoding);
Console.WriteLine("Creating a document with utf-8 encoding")
Dim encodedDoc8 As XDocument = _
        <?xml version='1.0' encoding='utf-8' standalone='yes'?>
        <Root>Content</Root>

encodedDoc8.Save("EncodedUtf8.xml")
Console.WriteLine("Encoding is:{0}", encodedDoc8.Declaration.Encoding)
Console.WriteLine()

Console.WriteLine("Creating a document with utf-16 encoding")
Dim encodedDoc16 As XDocument = _
        <?xml version='1.0' encoding='utf-16' standalone='yes'?>
        <Root>Content</Root>

encodedDoc16.Save("EncodedUtf16.xml")
Console.WriteLine("Encoding is:{0}", encodedDoc16.Declaration.Encoding)
Console.WriteLine()

Dim newDoc8 As XDocument = XDocument.Load("EncodedUtf8.xml")
Console.WriteLine("Encoded document:")
Console.WriteLine(File.ReadAllText("EncodedUtf8.xml"))
Console.WriteLine()
Console.WriteLine("Encoding of loaded document is:{0}", newDoc8.Declaration.Encoding)
Console.WriteLine()

Dim newDoc16 As XDocument = XDocument.Load("EncodedUtf16.xml")
Console.WriteLine("Encoded document:")
Console.WriteLine(File.ReadAllText("EncodedUtf16.xml"))
Console.WriteLine()
Console.WriteLine("Encoding of loaded document is:{0}", newDoc16.Declaration.Encoding)

该示例产生下面的输出:

Creating a document with utf-8 encoding
Encoding is:utf-8

Creating a document with utf-16 encoding
Encoding is:utf-16

Encoded document:
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Root>Content</Root>

Encoding of loaded document is:utf-8

Encoded document:
<?xml version="1.0" encoding="utf-16" standalone="yes"?>
<Root>Content</Root>

Encoding of loaded document is:utf-16

另请参阅