winforms qr code

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Figure 5-18. Using Solver to forecast your target pace per mile given a distance of 10 kilometers, a pacer s target finish time of 52 minutes, and a desired target pace per mile of 15 seconds (0.25 minute) faster than the pacer

To implement a feature, you need source code, which means a file, project, and other programming techniques. Before you can implement the features, you need to figure out how the source code will be organized. There are two levels of organization: File level: At the file level, you are organizing what kinds of projects and solutions you will be creating. Source code level: At the source code level, you are organizing the namespaces, class names, and other identifiers that are referenced throughout the source code. Implementing a calculator at the file level starts with a decision about which of the three kinds of projects the calculator should be. As discussed in 1, you have three choices: Windows application, console application, or class library. If the calculator were a Windows application, it could look like Figure 2-3.

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For example, regular expressions can be used to extract or validate e-mail addresses, find valid dates in strings, remove duplicate lines of text, find the number of times a word or a letter appears in a phrase, find or validate IP addresses, and so on In the previous exercise, you used URL rewriting rules, using regular expressions, to match incoming keyword-rich URLs and obtain their rewritten, dynamic versions A bit later in this chapter, we ll use a regular expression that prepares a string for inclusion in the URL, by replacing unsupported characters with dashes and eliminating duplicate separation characters Regular expressions are supported by many languages and tools, including the NET languages and the URL rewriting tools A regular expression that works in C# will work in Java or PHP without modifications most of the time.

When you want to do an operation based on regular expressions, you usually must provide at least three key elements: The source string that needs to be parsed or manipulated The regular expression to be applied on the source string The kind of operation to be performed, which can be either obtaining the matching substrings or replacing them with something else Regular expressions use a special syntax based on literal characters, which are interpreted literally, and metacharacters, which have special matching properties A literal character in a regular expression matches the same character in the source string, and a sequence of such characters matches the same sequence in the source string This is similar to searching for substrings in a string For example, if you match or in favorite color, you ll find two matches for it.

Figure 2-3. A calculator implemented as a Windows application A calculator implemented as a Windows application allows users to perform calculations by clicking the appropriate buttons. To add two numbers, the user would click the appropriate buttons to key in the first number, then an operation, then the second number, with a final step of the clicking the equal sign button. The equal sign is a signal to the calculator application to process the data that has been entered and generate a result. The text box would display the results.

Metacharacters have special properties, and it s their power and flexibility that makes regular expressions so useful For example, the question mark ( ) metacharacter specifies that the preceding character is optional So if you want to match color and colour, your regular expression would be colou r As pointed out earlier, regular expressions can become extremely complex when you get into their more subtle details In this section, you ll find explanations for the regular expressions we re using, and we suggest that you continue your regex training using a specialized book or tutorial..

The second choice is to implement a calculator using a console application, where the numbers are entered as text, as illustrated in Figure 2-4.

Table 7-2 contains the description of the most common regular expression metacharacters. You can use this table as a reference for understanding the rewrite rules.

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