The difference between value and innertext in XmlNode

This is a question I think many people have encountered when using. NET to manipulate XML documents, first look at MSDN for explanations of these two properties:

Xmlnode.value: Gets or sets the value of the node.

Xmlnode.innertext: Gets or sets the concatenated value of the node and all its child nodes.

Just look at these two definitions is not still a little confused, below we use examples to illustrate:

1. When the operation node is a leaf node:

XmlDocument xdoc=new XmlDocument ();

Xdoc.loadxml (@ "<SmartCoder>

                <Coder>

                    <Name>Tiramisu</Name>

                    <Age>25</Age>

                </Coder>

            </SmartCoder> ");

XmlNode root=xdoc.documentelement;

XmlNode Namenode=root. selectSingleNode ("Coder/name");  Get Name Node

Console.WriteLine (Namenode.value);

Console.WriteLine (Namenode.innertext);

The output results are as follows:

Null

Tiramisu

2. When the action node is the parent node:

XmlDocument xdoc=new XmlDocument ();

Xdoc.loadxml (@ "<SmartCoder>

                <Coder>

                    <Name>Tiramisu</Name>

                    <Age>25</Age>

                </Coder>

            </SmartCoder> ");

XmlNode root=xdoc.documentelement;

XmlNode Codernode=root. selectSingleNode ("coder");  Get Name Node

Console.WriteLine (Codernode.value);

Console.WriteLine (Codernode.innertext);

The output results are as follows:

Null

Tiramisu25

3. When the Operation node is an attribute:

XmlDocument xdoc=new XmlDocument ();

Xdoc.loadxml (@ "<SmartCoder>

                <coder englishname= ' Benjamin ' >

                    <Name>Tiramisu</Name>

                    <Age>25</Age>

                </Coder>

            </SmartCoder> ");

XmlNode root=xdoc.documentelement;

XmlNode Codernode=root. selectSingleNode ("coder");  Get Name Node

Console.WriteLine (codernode.attributes["Englishname"). Value);

Console.WriteLine (codernode.attributes["Englishname"). InnerText);

Or

XmlDocument xdoc=new XmlDocument ();

Xdoc.loadxml (@ "<SmartCoder>

                <coder englishname= ' Benjamin ' >

                    <Name>Tiramisu</Name>

                    <Age>25</Age>

                </Coder>

            </SmartCoder> ");

XmlNode root=xdoc.documentelement;

XmlNode Engnameattr=root. selectSingleNode ("coder/@EnglishName");  Get Name Node

Console.WriteLine (Engnameattr.value);

Console.WriteLine (Engnameattr.innertext);

Output Result:

Benjamin
Benjamin

In the example code above, we use the XPath syntax to find DOM elements, and more XPath syntax information, please refer to them yourself.

As we can see from the example, InnerText will stitch the text content of the node and its child elements (what the angle brackets contain) together as the return value, while value does not, either the parent node or the child node, the return value is null , and when the operation's node type is a property, The return value of value is the same as innertext. In fact, the return value of value is related to the node type (NodeType), and the following is the type of node listed in MSDN and the return value of Xmlnode.value:

Type	Value
Attribute	The value of the property
Cdatasection	CDATA the contents of the section.
Comment	The content of the comment
Document	Null
DocumentFragment	Null
DocumentType	Null
Element	Null. You can use the Xmlelement.innertext or Xmlelement.innerxml property to access the value of an element node.
Entity	Null
EntityReference	Null
Notation	Null
ProcessingInstruction	All content (excluding instruction targets).
Text	Content of the text node
SignificantWhitespace	White space characters. Whitespace can consist of one or more empty characters, carriage returns, line feeds, or tabs.
Whitespace	White space characters. Whitespace can consist of one or more empty characters, carriage returns, line feeds, or tabs.
XmlDeclaration	The content of the declaration (that is, everything between <?xml and?>).

The node types we get in Example 1, 2 are Element, so Xmlnode.valueThe return value is NULL。

The difference between value and innertext in XmlNode