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One way you could enhance the component is with better support for error reporting. As it is, any database errors that occur are immediately returned to the calling code. In some cases (for example, if there is a legitimate database problem), this is a reasonable approach, because the component can t handle the problem. However, the component fails to handle one common problem properly. This problem occurs if the connection string isn t found in the web.config file. Though the component tries to read the connection string as soon as it s created, the calling code doesn t realize a problem exists until it tries to use a database method. A better approach is to notify the client as soon as the problem is detected, as shown in the following code example: public class DBUtil { private string connectionString; public DBUtil() { if (WebConfigurationManager.ConnectionStrings["AdBoard"] == null) { throw new ApplicationException( "Missing ConnectionString variable in web.config."); }

You then reraise the error that you ve handled, like so: // now rethrow the error throw(ex); If you don t rethrow the error, ASP.NET will, since you ve caught the error, assume that it has been handled and that any problems have been rectified. As you re only logging the error and not doing anything to fix it, you rethrow the error so that ASP.NET is aware that a problem occurred. If you don t rethrow the error, the user would be presented with a page that s equally as unhelpful as an ASP.NET error message, as shown in Figure 4-11. Whether or not an error occurred, the finally block then executes. All you want to do here is close the connection to the database, like so: // close the database connection myConnection.Close(); Although it s possible to check the state of the connection using the State property and close the connection only if it s open, this isn t necessary. If the connection is already closed, then calling the Close() method won t have any unwanted side effects.

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$links = array(); $numSteps = count($params['trail']); for ($i = 0; $i < $numSteps; $i++) { $step = $params['trail'][$i]; // truncate the title if required if ($params['truncate'] > 0) $step['title'] = smarty_modifier_truncate($step['title'], $params['truncate']); // build the link if it's set and isn't the last step if (strlen($step['link']) > 0 && $i < $numSteps - 1) { $links[] = sprintf('<a href="%s" title="%s">%s</a>', htmlSpecialChars($step['link']), htmlSpecialChars($step['title']), htmlSpecialChars($step['title'])); } else { // either the link isn't set, or it's the last step $links[] = htmlSpecialChars($step['title']); } } // join the links using the specified separator return join($params['separator'], $links); } > After the array of links has been built in this function, we create a single string to be returned by joining on the separator option. The default value for the separator is >, which we preescape. It is preescaped because some characters you might prefer to use aren t typable, so you can specify the preescaped version when calling the plug-in. An example of this is the symbol, which we can use by calling {breadcrumbs separator=' » '}. When we generate the displayable title for each link, we make use of the Smarty truncate modifier. This allows us to restrict the total length of each breadcrumb link by specifying the maximum number of characters in a given string. If the string is longer than that number, it is chopped off at the end of the previous word and ... is appended. For instance, if you were to truncate The Quick Brown Fox Jumped over the Lazy Dog to 13 characters, it would become The Quick... . This is an improvement over the PHP substr() function, since substr() will simply perform a hard break in the middle of a word (so the example string would become The Quick Bro ).

else { connectionString = WebConfigurationManager.ConnectionStrings[ "AdBoard"].ConnectionString; } } // (Other class code omitted.) } This code throws an ApplicationException with a custom error message that indicates the problem. To provide even better reporting, you could create your own exception class that inherits from ApplicationException, as described in 8.

s Components often catch the exceptions that occur during low-level tasks (like reading a file or interTip

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