Adding Expando Properties in VS .NET

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Listing 215 Adding Expando Properties
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for (var i in thisprototype) { this[i] = thisprototype[i]; }
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The code iterates over the members that are attached to the prototype and assigns them as expando properties to the enumeration When we register our enumeration, we include two parameters The rst is a string that is the name of the enumeration, and the second is a boolean that indicates whether the enumeration should run in ags mode or non ags mode As you might expect, if the second parameter s value is true, the enumeration runs in ags mode; if it is false, the enumeration runs in non ags mode An enumeration that is set up to run in ags mode allows bit operations to be applied to the enumeration s items In most cases, the usage of the ags mode affects only the parse and toString methods associated to the enumeration Let s cover the parse and toString methods and see how they perform when our enumeration is both in the non ags mode and in the ags mode
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Parse
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The parse method syntax is as follows:
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EnumTypeparse(value, ignoreCase);
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Depending on whether the enumeration is in ags mode or non ags mode, parse behaves differently
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Parse Nonflags Mode
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When you use parse on an enumeration that is in non ags mode, parse attempts to convert the string into one of the enumeration s items and then return its value To do this, parse just takes the string that was passed into the method through the rst parameter and attempts to nd it the enumeration s prototype If it can t nd the string in the enumeration, parse throws an invalid value error Listing 216 demonstrates the common usage of the parse method
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Listing 216 Parsing a Value to an Enumeration
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var value = BooksBookTypeparse("HowTo"); alert (value); // alerts 8 try { BooksBookTypeparse("Gardening"); } // throws an error catch (e) {}
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2: Microsoft AJA X Librar y Programming parse also optionally takes a second parameter, ignoreCase, which
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determines whether the parsing should be case sensitive By default, the ignoreCase value is false, and the parsing is case sensitive Listing 217 demonstrates the use of this parameter
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Listing 217 Parsing a Value Ignoring Case
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try { BooksBookTypeparse("howto", false); } catch (e) { } // throws an error because the lower-case string "howto" wasn't found var value = BooksBookTypeparse("howto", true); alert (value); // alerts 8
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This is the functionality of parse when the enumeration is marked to run in non ags mode
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Parse Flags Mode
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When you use parse on an enumeration that is marked to run in ags mode, multiple string values can be passed in through the rst parameter using a comma-separated list, and the method returns a bitwise OR d value of those strings parsed values If we attempt to pass in a comma-separated list to an enumeration that isn t set to run in ags mode, parse attempts to parse the string as a whole entity Listing 218 demonstrates parse s capability to parse multiple values when using an enumeration that is set to run in ags mode
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Listing 218 Parsing Multiple Values Using a Flag-Enabled Enumeration
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var value = BooksBookTypeparse("HowTo,SelfHelp"); alert (value); // alerts 24
In this code example, the two values passed in, "HowTo" and "SelfHelp", are parsed and are evaluated to their respective enumeration items, BooksBookTypeHowTo and BooksBookTypeSelfHelp Then, their values are bitwise OR d together to form the resulting value 24 In this particular example, the resulting value 24 is returned because the BooksBookTypeHowTo has the value of 8, or in binary format 00001000, and the BooksBookType
Extending the Microsoft AJA X Librar y SelfHelp has the value 16, or in binary format 00010000 When they are bit-
wise OR d together, they form the value 00011000, which is equivalent to the integer value 24
NOTE
Not Found Values
If one of the strings included in the comma-separated string wasn t found on the enumeration, parse throws an error Also, if we had only passed in one value, as we did in Listing 216, the result would have been the same
toString
The toString method syntax is as follows:
EnumTypetoString(value);
Depending on whether the enumeration is in ags mode or in non ags mode, toString behaves differently