c# code 39 generator Figure 3-9. Columns exported as elements in C#.NET

Creating Code 39 Extended in C#.NET Figure 3-9. Columns exported as elements

Figure 3-9. Columns exported as elements
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CHAPTER 3 REA DING A ND WRITING XML DOCUME NTS
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The root element is <table>, which contains one or more <row> elements. Each <row> element further contains child elements, depending on the number of columns in the table. The child elements assume the same name as the database column name. Similarly, when the user opts to export all the columns as attributes, the resultant document will bear the structure shown in Figure 3-10.
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Figure 3-10. Columns exported as attributes The root element is <table> again, which will contain one or more <row> elements. Each <row> element will have one or more attributes representing the column values. The attribute name will be the same as the column name. All XML documents need to have the XML processing instruction at the top. To include this processing instruction, we call the WriteStartDocument() method. Then the code writes a comment specifying the date and time at which the file is exported. The WriteComment() method accepts the comment string and writes it into the document. The root element <table> is then written to the document by using the WriteStartElement() method, which accepts the name of the element to be written and writes it to the file. Note that you need not specify the < and > characters while specifying the element name. Thus, when you pass table as the parameter to the WriteStartElement() method, it writes <table> into the file. The code now starts iterating through the available records. The Read() method of the SqlDataReader class advances the record pointer to the next row and reads values from that row. It returns true if the record can be read successfully; otherwise, it returns false.
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Exporting Columns As Elements
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If the columns are to be exported as elements (that is, the first radio button is selected), the <row> element will not have any attributes. A for loop iterates through all the columns of the current row. The FieldCount property of the SqlDataReader class returns the total number of columns in the result set. With each iteration of the for loop, a new element is created by using
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C HAPTE R 3 READING A ND WRITIN G XML DOC UMEN TS
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the WriteStartElement() method. This time the WriteStartElement() method accepts the column name returned by the GetName() method of the SqlDataReader class, which accepts the column index and returns the column name. To write the actual value of the column, the WriteString() method is called. This method accepts the string to be written, which in our example is retrieved by using the GetValue() method of SqlDataReader. The GetValue() method accepts a column index and returns the contents as an object. The code then calls the ToString() method on the returned object to get its string representation. After the element value is written, the code calls the WriteEndElement() method of XmlTextWriter to write the innermost end element to the file. The WriteEndElement() method correctly writes the end element depending on the nesting of the document. When you run the application and export your table, your output should resemble Figure 3-9.
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Exporting Columns As Attributes
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If the column values are to be written as attributes instead of elements, a similar process is followed. This time, however, the code uses the WriteAttributeString() method of XmlTextWriter to write the attributes. The WriteAttributeString() method accepts two parameters: the name of the attribute and the value of the attribute. After writing all the end elements, the code closes the XmlTextWriter by calling its Close() method. Similarly, SqlDataReader and SqlConnection are also closed. When you run the application and export your table, your output should resemble Figure 3-10.
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Specifying Character Encoding
In the previous example, we constructed the XmlTextWriter class by providing a filename and the character encoding. In this case, the encoding parameter was null, but there are four possible encoding options in the .NET Framework. They are available as properties of the Encoding class, which resides in the System.Text namespace. Each of these properties is shown in Table 3-1. Table 3-1. Properties of the Encoding Class
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