Xml programs in .net

Checks that the Name property of the element found matches the given string before reading a text-only element. Checks that the LocalName and NamespaceURI properties of the element found matches the given strings before reading a text-only element. However, we recommend that you use the ReadElementContentAsString String, String method instead, because it provides a more straightforward way to handle this operation.

When overridden in a derived class, reads the content, including markup, representing this node and all its children. Checks that the current content node is an element with the given Name and advances the reader to the next node.

Checks that the current content node is an element with the given LocalName and NamespaceURI and advances the reader to the next node. When overridden in a derived class, reads the contents of an element or text node as a string. Returns a new XmlReader instance that can be used to read the current node, and all its descendants. Advances the XmlReader to the next descendant element with the specified qualified name.

Advances the XmlReader to the next descendant element with the specified local name and namespace URI. Advances the XmlReader to the next sibling element with the specified qualified name. When overridden in a derived class, resolves the entity reference for EntityReference nodes. For a description of this member, see Dispose. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.

Contents Exit focus mode. Xml Reader Class Reference Is this page helpful? Please rate your experience Yes No. Any additional feedback? Namespace: System.

Xml Assembly: System. Represents a reader that provides fast, noncached, forward-only access to XML data. Note See section 3. In this article. DtdProcessing property. ValidationType property. Whether the reader should validate data, and what type of validation to perform DTD or schema.

The default is no data validation. ValidationEventHandler event. An event handler for receiving information about validation events. If an event handler is not provided, an XmlException is thrown on the first validation error. ValidationFlags property. The attributes are validated based on their data type. See the XmlSchemaValidationFlags reference page for the setting to use in specific scenarios. Disabled by default. Enabled by default. The ValidationEventHandler is used for notification.

The XmlSchemaSet to use for validation. XmlResolver property. The XmlResolver for resolving and accessing external resources. CheckCharacters property. Enable or disable checks for the following: - Characters are within the range of legal XML characters, as defined by the 2.

When this property is set to true default , an XmlException exception is thrown if the XML file contains illegal characters or invalid XML names for example, an element name starts with a number.

Character and name checking is enabled. Setting CheckCharacters to false turns off character checking for character entity references. If the reader is processing text data, it always checks that XML names are valid, regardless of this setting.

Note: The XML 1. Therefore, if the reader is configured to support ConformanceLevel. ConformanceLevel property. Choose the level of conformance to enforce: - Document. Conforms to the rules for a well-formed XML 1. Conforms to the rules for a well-formed document fragment that can be consumed as an external parsed entity.

Conforms to the level decided by the reader. If the data isn't in conformance, an XmlException exception is thrown. Read the first node, and advance through the stream one node at a time. Such calls are typically performed inside a while loop. Use the NodeType property to get the type for example, attribute, comment, element, and so on of the current node. Skip non-content nodes and move to the next content node or to the end of the file. Read an element and all its children, and return a new XmlReader instance set to ReadState.

This method is useful for creating boundaries around XML elements; for example, if you want to pass data to another component for processing and you want to limit how much of your data the component can access.

IsStartElement method. ReadStartElement method. Check that the current node is an element and advance the reader to the next node calls IsStartElement followed by Read. ReadEndElement method. ReadElementString method. ReadToDescendant method. ReadToNextSibling method. IsEmptyElement property. Check if the current element has an end element tag.

HasAttributes property. AttributeCount property. MoveToFirstAttribute method. MoveToNextAttribute method. MoveToAttribute method. GetAttribute method or Item[] property. IsDefault property. Check whether the current node is an attribute that was generated from the default value defined in the DTD or schema.

MoveToElement method. Move to the element that owns the current attribute. Use this method to return to an element after navigating through its attributes. ReadAttributeValue method. Value property. The underlying language will transparently deal with encoding issues. XML files aren't lines of text Your first temptation, especially if you're in a hurry, may be to try to process the file just like you would the non-XML version—reading it one line at a time.

This is a very, very fragile way to handle XML data. The example would be just as valid if the file was organized as shown in Example 4: Example 4. INI file with different line breaks.

Brute force: Using regular expressions XML was consciously designed so that it could be effectively processed by "low-tech" solutions, in particular text processors like Perl using regular expressions. Line 9 The document is processed a section at a time. Line 10 The start-tag for the section is stored in a variable. Line 15 Once we find a section with the name we're after, we perform an analogous parse of the entries within that section.

A more complete solution Both of the solutions presented so far have some serious drawbacks. Most significantly, they read the entire XML document each time a string is requested. A more complete solution can be found in cfgfile. This module loads the entire file into memory and provides methods for setting as well as getting profile strings. Conclusion In this article, we've looked at several ways to process XML documents and demonstrated the benefits of using an XML parser to do the hard work.

Appendix A. Getting the code The code samples mentioned in this article can be retrieved separately: sample. Line 5. The entire document is loaded into memory. Line 9. It also provides functionality to add XML items such as attributes, comments, spaces, elements, and new nodes. XmlDocumentFragment class represents a document fragment, which can be used to add to a document.

NET data set objects. In spite of above discussed classes, System. Xml namespace contains more classes. Next namespace in Xml series is System. Serialization namespace contains classes that are used to serialize objects into XML format documents or streams. This class contains many Move methods to move through a document.

This file comes with VS. NET samples. You can search this on your machine and change the path of the file in the following line:. Besides XmlReader methods and properties, these classes also contain members to read text, node, and schemas respectively. You read a file by passing file name as a parameter in constructor. After read method is called, you can read all information and data stored in a document.

The NodeType property of XmlTextReader is important when you want to know the content type of a document. List 2 code sample reads an XML document, finds a node type and writes information at the end with how many node types a document has. Highly Recommended. I have published a free book on XML programming using C. Get your free copy here. Still hungry for more XML programming with C and. Here is a dedicated section with hundreds of articles and code samples on XML programming using C and. After reading a node, I check its NodeType property to find the node and write node contents to the console and keep track of number of particular type of nodes.

In the end, I display total number of different types of nodes in the document. XmlWriter class contains the functionality to write to XML documents. It contains methods and properties to write to XML documents. This class has several Writexxx method to write every type of item of an XML document.

Some of these methods are used in a start and end pair. It is usually stored in a simple text file and is processed by special software that is capable of interpreting XML. Frahaan Hussain. Jordan Stanchev. Simon Sez IT.