Figure 7 states for XML Writer
State
Description
Attribute
The writer enters this state when a attribute is being written
Closed
The Close method has been called and the writer are no longer available for writing operations
Content
The writer enters the content of a node is being written
Element
The writer enters this state when a element start tag is being written
Prolog
The writer is writing the prolog of a well-formed XML 1.0 document
Start
The writer is under an initial state and awaiting for a write call to be issued
?? Writer puts the output text inside a buffer. Normally, the buffer is flushed or erased, and the XML text should be written out before the writer is closed. At any time, you can flush the buffer by calling the Flush method, write the current content to the stream (through the BaseStream property * * *), and then release the portion of memory occupied, writer remains open (open state), can continue to control. Note that while writing part of the document content, other programs cannot process the document until the writer has closed it.
?? You can write attribute nodes in two ways. The first method is to use the Writestartatribute method to create a new attribute node to update the writer's state. The property value is then set using the WriteString method. After writing, use the WriteEndElement method to finish the node. In addition, you can also use the WriteAttributeString method to create a new attribute node, when the state of Writerr is element, writerattributestring start work, it creates a single attribute. Similarly, the WriteStartElement method writes the node's start tag (<), and then you can set the node's properties and text content casually. The closed tags of the element nodes are all with "/>". If you want to write closed tags can be written in Writefullendelement method.
?? The text that is passed to the write method should be avoided including sensitive tag characters, such as the less than sign (<). The string written into the stream using the WriteRaw method is not parsed, and we can use it to write a special string to the XML document. The following two lines of code, the first line of output is "<", the second line output "<":
Writer. WriteString (' < ');
Writer. WriteRaw (' < ');
?? Read/write Stream
?? Interestingly, reader (browser) and writer classes provide a way to read and write data streams based on Base64 and BinHex encoding. There are subtle differences between the efficacy of the WriteBase64 and Writebinhex methods and the efficacy of other writing methods. They are all flow-based, and the two methods function like a byte array instead of a string. The following code first converts a string into a byte array and then writes them into a Base64 encoded stream. The GetBytes static method of the encoding class completes the task of conversion:
Writer. WriteBase64 (
Encoding.Unicode.GetBytes (BUF),
0, buf. LENGTH*2);
The above is the easy processing of XML data (4-2) in the. NET framework, and more about topic.alibabacloud.com (www.php.cn)!
