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Printing PDF-417 2d barcode in C#.NET Part III Essential Types

Part III Essential Types
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By the way, if you want to obtain a string for an object that isn t formatted for any particular culture, you should call System.Globalization.CultureInfo s static InvariantCulture property and pass the object returned as ToString s formatProvider parameter:
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Decimal price = 123.54M; String s = price.ToString("C", CultureInfo.InvariantCulture); MessageBox.Show(s);
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If you build and run this code, the message box shown in Figure 14-6 appears . Notice the first character in the resulting string: . This is the international sign for currency (U+00A4) .
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FIguRE 14-6 Numeric value formatted to represent a culture-neutral currency
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Normally, you wouldn t display a string formatted by using the invariant culture to a user . Typically, you d just save this string in a data file so that it could be parsed later . In the FCL, just three types implement the IFormatProvider interface . The first is CultureInfo, which I ve already explained . The other two are NumberFormatInfo and DateTimeFormatInfo . When GetFormat is called on a NumberFormatInfo object, the method checks if the type being requested is a NumberFormatInfo . If it is, this is returned; if it s not, null is returned . Similarly, calling GetFormat on a DateTimeFormatInfo object returns this if a DateTimeFormatInfo is requested and null if it s not . These two types implement this interface simply as a programming convenience . When trying to obtain a string representation of an object, the caller commonly specifies a format and uses the culture associated with the calling thread . For this reason, you often call ToString, passing a string for the format parameter and null for the formatProvider parameter . To make calling ToString easier for you, many types offer several overloads of the ToString method . For example, the Decimal type offers four different ToString methods:
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// This version calls ToString(null, null). // Meaning: General numeric format, thread's culture information public override String ToString(); // This version is where the actual implementation of ToString goes. // This version implements IFormattable's ToString method. // Meaning: Caller-specified format and culture information public String ToString(String format, IFormatProvider formatProvider);
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14 Chars, Strings, and Working with Text
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// This version simply calls ToString(format, null). // Meaning: Caller-specified format, thread's culture information public String ToString(String format); // This version simply calls ToString(null, formatProvider). // This version implements IConvertible's ToString method. // Meaning: General format, caller-specified culture information public String ToString(IFormatProvider formatProvider);
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So far, I ve explained how an individual type formats its own objects . At times, however, you want to construct strings consisting of many formatted objects . For example, the following string has a date, a person s name, and an age:
String s = String.Format("On {0}, {1} is {2} years old.", new DateTime(2010, 4, 22, 14, 35, 5), "Aidan", 7); Console.WriteLine(s);
If you build and run this code where en-US is the thread s current culture, you ll see the following line of output:
On 4/22/2010 2:35:05 PM, Aidan is 7 years old.
String s static Format method takes a format string that identifies replaceable parameters
using numbers in braces . The format string used in this example tells the Format method to replace {0} with the first parameter after the format string (the date/time), replace {1} with the second parameter after the format string ( Aidan ), and replace {2} with the third parameter after the format string (7) . Internally, the Format method calls each object s ToString method to obtain a string representation for the object . Then the returned strings are all appended and the complete, final string is returned . This is all fine and good, but it means that all of the objects are formatted by using their general format and the calling thread s culture information . You can have more control when formatting an object if you specify format information within braces . For example, the following code is identical to the previous example except that I ve added formatting information to replaceable parameters 0 and 2:
String s = String.Format("On {0:D}, {1} is {2:E} years old.", new DateTime(2010, 4, 22, 14, 35, 5), "Aidan", 7); Console.WriteLine(s);
If you build and run this code where en-US is the thread s current culture, you ll see the following line of output:
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