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=WEEKDAY ([CloseDate],2)

// row for headers, now add that prior to writing the // first data row. if (HasColumnHeaders && !m_firstRowRead) { m_firstRowRead = true; string header = ""; foreach(string tmp in m_tokenValues) header += tmp + ","; m_outputStream.WriteLine(header.TrimEnd(',')); } // Prepare and write the current CSV row string row = ""; foreach(string tmp in m_tokenValues) row += m_tokenValues[tmp] + ","; m_outputStream.WriteLine(row.TrimEnd(',')); } // Move ahead as usual return base.Read(); } If the first row in the source CSV file has been interpreted as the headers of the columns (HasColumnHeaders property set to true), this implementation of the Read method ensures that the very first row written to the output stream contains just those headers. After that, the current contents of the m_tokenValues collection is serialized to a comma-separated string and is written to the output stream. Once this has been done, the Read method finally moves to the next line. Closing the Output Stream When you close the reader, the output stream is also closed. In addition, because the output stream was writing to a temporary file, that file is also copied over by the source CSV replacing it, as shown here: public override void Close() { base.Close(); if (EnableOutput) { m_outputStream.Close(); File.Copy(m_tempFileName, m_fileName, true); File.Delete(m_tempFileName); } 163

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When you find your image, select it and click Insert. The image will appear at the current cursor position. It is also possible to insert a picture by copying it from a different program, such as a photo editing program. Select the place in your document where you want to insert the image, then use the Ctrl+V shortcut key to paste the picture into the document.

} The net effect of this code is that any changes entered in the source CSV document are cached to a temporary file, which then replaces the original. The user won't perceive anything of these workings, however. The CSV Reader/Writer in Action Let's take a sample CSV file, read it, and apply some changes to the contents so that they will automatically be persisted when the reader is closed. Here is the source CSV file: LastName,FirstName,Title,Country Davolio,Nancy,Sales Representative,USA Fuller,Andrew,Sales Manager,USA Leverling,Janet,Sales Representative,UK Suyama,Michael,Sales Representative,UK The idea is to replacing the expression Sales Representative with another one say, Sales Force. The sample application, nearly identical to the one in 2, loads the CSV file, applies the changes, and then displays it through a desktop DataGrid control, as follows: // Instantiate the reader on a CSV file XmlCsvReadWriter reader; reader = new XmlCsvReadWriter("employees.csv", hasHeader.Checked); reader.EnableOutput = true; reader.Read(); // Define the schema of the table to bind to the grid DataTable dt = new DataTable(); for(int i=0; i<reader.AttributeCount; i++) { reader.MoveToAttribute(i); DataColumn col = new DataColumn(reader.Name, typeof(string)); dt.Columns.Add(col); } reader.MoveToElement(); // Loop through the CSV rows and populate the DataTable do { DataRow row = dt.NewRow(); for(int i=0; i<reader.AttributeCount; i++) { 164

Day of the week, with numbers 1 (Monday) through 7 (Sunday)

if (reader[i] == "Sales Representative") reader[i] = "Sales Force"; row[i] = reader[i].ToString(); } dt.Rows.Add(row); } while (reader.Read()); // Persist changes and move ahead

YEAR([Column1]) MONTH([Column1]) DAY([Column1]) TIME([Hour], [Minute],[Second]) HOUR([Column1]) MINUTE([Column1]) SECOND([Column1])

// Flushes the changes to disk reader.Close(); // Bind the table to the grid dataGrid1.DataSource = dt; If the contents of a specified CSV attribute matches the specified string, it is replaced. The change occurs initially on an internal collection and is then transferred to the output stream during the execution of the Read method. Finally, the reader is closed and the output stream flushed. Figure 4-16 shows the program in action.

Readers and writers are at the foundation of every I/O operation in the .NET Framework. You find them at work when you operate on disk and on network files, when you serialize and deserialize, while you perform data access, even when you read and write configuration settings. XML writers are ad hoc tools for creating XML documents using a higherlevel metaphor and putting more abstraction between your code and the markup. By using XML writers, you go far beyond markup to reach a nodeoriented dimension in which, instead of just accumulating bytes in a block of contiguous memory, you assemble nodes and entities to create the desired schema and infoset. In this chapter, we looked primarily at the programming interface of .NET XML writers specifically, the XmlTextWriter class. You learned how to create well-formed XML documents, how to add nodes and attributes, how to support namespaces, and how to encode text using BinHex and base64 encoding algorithms.

When you click an image in Word, the Picture toolbar appears, as shown in Figure 7-5. It provides a number of options for editing your picture, such as adjusting brightness, contrast, and color. You can also crop images or rotate them.

=YEAR ([CloseDate]) =MONTH ([CloseDate]) =DAY ([CloseDate]) =TIME([Column1], [Column2], [Column3]) =HOUR ([CloseDate]) =MINUTE ([CloseDate]) =SECOND ([CloseDate])

.NET XML writers only ensure the well-formedness of each individual XML element being generated Writers can in no way guarantee the well-formedness of the entire document and can do even less to validate a document against a DTD or a schema Although badly formed XML documents can only result from actual gross programming errors, the need for an extra step of validation is often felt in production environments, especially when the creation of the document depends on a number of variable factors and run-time conditions For this reason, we've also examined the key points involved in the design and implementation of a validating XML writer This chapter also featured a few custom XML-driven writers In this chapter, you learned how to write string arrays, JPEG images, and DataTable objects to specific XML schemas It goes without saying that the techniques discussed here do not exhaust the options available in the .

NET Framework for those tasks For example, the XML serializer can sometimes be more effectively employed to obtain the same results (XML serializers are covered in 11) These examples were provided with a double goal: to show one way to solve a problem, and to demonstrate custom XML writers As a general guideline, bear in mind that the more specific an XML-based format is, the more a specialized writer class can help The key advantage of a writer class is perhaps not so much raw performance savings but the resultant elegance, reusability, and efficiency of the design We've also looked at an intermediate level of XML parser that falls somewhere between streaming parsers such as readers and XML DOM XML readers are great for parsing XML documents, but they work in a read-only way.

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