how to generate barcode in asp net core

barcode in asp net core

barcode in asp net core

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Building the integration and functional tests relieved you from manual testing every time you enhanced the application, and it allowed you to focus on the next set of enhancements: externalizing strings to property files and messages You also learned about errors, validation, and flash messages This gave you insights into how Grails renders errors and messages and how you can control them You also learned about the redirect message problem and how using flash-scoped messages solves the problem Once you had the basic mechanics of the application down, your attention turned to the user experience by restricting the information users were shown to the information that was relevant to them You accomplished this by enhancing the controller actions so that they restricted the model information returned to the views to only the information users were permitted to see You learned about the URL and request parameters.

Figure 3-14 shows a single-line TextBox control and a multiline TextBox control with scrollbars. Note that for scrollbars to appear on a TextBox, the AcceptsReturn property must be set to true.

Then you enhanced the view by removing the ID and user fields from the category and to-do views, and you enhanced the save and update actions to set the user information to the currently logged-in user..

Occasionally you need a character, or a string, repeated a certain number of times. Perhaps it s only for printing a line of dashes across the width of your screen, or for drawing patterns, but the need arises more often than one might expect (for example, see the substr function later in this chapter).

Figure 3-14. The TextBox control Here s the corresponding XAML: <TextBox Canvas.Top="30" Canvas.Left="120" Width="200"/> <TextBox Canvas.Top="60" Canvas.Left="120" Height="150" Width="200" AcceptsReturn="True" HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Visible"/>

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You learned how to use interceptors for things like auditing. Finally, you created a simple audit log using action interceptors and logging. It s important to remember that even though we covered a lot, there are even more advanced things you can do with views and controllers. We ll cover more of the advanced topics in the coming chapters. The next step on your journey is to learn more about domain models and services.

With the repeat function, strings can rapidly be built up to any desired length. Because the string triples in length each time through the while loop, even long strings are produced very quickly. Usage _repeat [-n] STRING LENGTH ## result is stored in $_REPEAT repeat [-n] STRING LENGTH ## result is printed This function produces a string of LENGTH characters, or, if the -n option is used, with LENGTH repetitions of STRING. Here are a couple of examples, with the results: $ repeat = 30 ============================== $ _repeat -n '/\' 20 $ printf "%s\n" "$_REPEAT" /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ Here, repeat is used in a bricklaying demonstration: $ _repeat -n '_____|' 20 $ printf "%80.80s\n" "$_REPEAT" "${_REPEAT# }" "$_REPEAT" "${_REPEAT# }" _____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|__ __|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____ _____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|__ __|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____ The Script _repeat() { ## If the first argument is -n, repeat the string N times ## otherwise repeat it to a length of N characters case $1 in -n) shift r_num=$(( ${#1} * $2 )) ;; *) r_num=$2 ;; esac _REPEAT=$1 while [ ${#_REPEAT} -lt ${r_num} ] do _REPEAT=$_REPEAT$_REPEAT$_REPEAT done

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