open source qr code library vb.net Part III Essential Types in .NET

Generator QR Code in .NET Part III Essential Types

Part III Essential Types
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// Clear the StringBuilder (allocates a new Char array). sb.Length = 0; // Load the uppercase String into the StringBuilder, // and perform more manipulations. sb.Append(s).Insert(8, "Marc-"); // Convert the StringBuilder back to a String. s = sb.ToString(); // Display the String to the user. Console.WriteLine(s); // "JEFFREY-Marc-RICHTER"
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It s inconvenient and inefficient to have to write this code just because StringBuilder doesn t offer all of the operations that String does . In the future, I hope that Microsoft will add more string operation methods to StringBuilder to make it a more complete class .
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Obtaining a String Representation of an Object: ToString
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You frequently need to obtain a string representation of an object . Usually, this is necessary when you want to display a numeric type (such as Byte, Int32, and Single) or a DateTime object to the user . Because the .NET Framework is an object-oriented platform, every type is responsible for providing code that converts an instance s value to a string equivalent . When designing how types should accomplish this, the designers of the FCL devised a pattern that would be used consistently throughout . In this section, I ll describe this pattern . You can obtain a string representation for any object by calling the ToString method . A public, virtual, parameterless ToString method is defined by System.Object and is therefore callable using an instance of any type . Semantically, ToString returns a string representing the object s current value, and this string should be formatted for the calling thread s current culture; that is, the string representation of a number should use the proper decimal separator, digit-grouping symbol, and other elements associated with the culture assigned to the calling thread .
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System.Object s implementation of ToString simply returns the full name of the object s
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type . This value isn t particularly useful, but it is a reasonable default for the many types that can t offer a sensible string . For example, what should a string representation of a FileStream or a Hashtable object look like All types that want to offer a reasonable way to obtain a string representing the current value of the object should override the ToString method . All base types built into the FCL (Byte, Int32, UInt64, Double, and so on) override their ToString method and return a culturally aware string . In the Visual Studio debugger, a datatip is displayed when the mouse is placed over a particular variable . The text shown in the datatip is obtained by calling the object s ToString method . So, when you define a class, you should always override the ToString method so that you get good debugging support .
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14 Chars, Strings, and Working with Text
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Specific Formats and Cultures
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The parameterless ToString method has two problems . First, the caller has no control over the formatting of the string . For example, an application might want to format a number into a currency string, decimal string, percent string, or hexadecimal string . Second, the caller can t easily choose to format a string by using a specific culture . This second problem is more troublesome for server-side application code than for client-side code . On rare occasions, an application needs to format a string by using a culture other than the culture associated with the calling thread . To have more control over string formatting, you need a version of the ToString method that allows you to specify precise formatting and culture information . Types that offer the caller a choice in formatting and culture implement the System. IFormattable interface:
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public interface IFormattable { String ToString(String format, IFormatProvider formatProvider); }
In the FCL, all of the base types (Byte, SByte, Int16/UInt16, Int32/UInt32, Int64/UInt64, Single, Double, Decimal, and DateTime) implement this interface . In addition, some other types, such as Guid, implement it . Finally, every enumerated type definition will automatically implement the IFormattable interface so that a meaningful string symbol from an instance of the enumerated type can be obtained .
IFormattable s ToString method takes two parameters . The first, format, is a string that tells the method how the object should be formatted . ToString s second parameter, formatProvider, is an instance of a type that implements the System.IFormatProvider interface . This type supplies specific culture information to the ToString method . I ll discuss how shortly .
The type implementing the IFormattable interface s ToString method determines which format strings it s going to recognize . If you pass a format string that the type doesn t recognize, the type is supposed to throw a System.FormatException . Many of the types Microsoft has defined in the FCL recognize several formats . For example, the DateTime type supports d for short date, D for long date, g for general, M for month/day, s for sortable, T for long time, u for universal time in ISO 8601 format, U for universal time in full date format, Y for year/month, and others . All enumerated types support G for general, F for flags, D decimal, and X for hexadecimal . I ll cover formatting enumerated types in more detail in 15, Enumerated Types and Bit Flags . Also, all of the built-in numeric types support C for currency, D for decimal, E for exponential (scientific) notation, F for fixed-point, G for general, N for number, P for percent, R for round-trip, and X for hexadecimal . In fact, the numeric types also support picture format strings just in case the simple format strings don t offer you exactly what
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