barcode printing using c#.net PART II in Visual C#

Generation Quick Response Code in Visual C# PART II

PART II
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Using StringFormat( ) to Format Values
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You can obtain a formatted value by calling one of the Format( ) methods defined by String They are shown in Table 22-5 Format( ) works much like WriteLine( ), except that it returns a formatted string rather than outputting it to the console
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Method public static string Format(string format, object arg0) public static string Format(string format, object arg0, object arg1) public static string Format(string format, object arg0, object arg1, object arg2) public static string Format(string format, params object[ ] args) public static string Format(IFormatProvider provider, string format, params object[ ] args)
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TABLE 22-5 The Format( ) Methods
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Description Formats arg0 according to the format command in format Returns a copy of format in which formatted data has been substituted for the format command Formats arg0 and arg1 according to the corresponding format commands in format Returns a copy of format in which formatted data has been substituted for the format commands Formats arg0, arg1, and arg2 according to the corresponding format commands in format Returns a copy of format in which formatted data has been substituted for the format commands Formats the values passed in args according to the format commands in format Returns a copy of format in which formatted data has been substituted for each format command Formats the values passed in args according to the format commands in format using the format provider specified by provider Returns a copy of format in which formatted data has been substituted for each format command
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Part II:
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Here is the previous format demonstration program rewritten to use StringFormat( ) It produces the same output as the earlier version
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// Use StringFormat() to format a value using System; class FormatDemo { static void Main() { double v = 1768865849; double v2 = 015; int x = 21; string str = StringFormat("{0:F2}", v); ConsoleWriteLine(str); str = StringFormat("{0:N5}", v); ConsoleWriteLine(str); str = StringFormat("{0:e}", v); ConsoleWriteLine(str); str = StringFormat("{0:r}", v); ConsoleWriteLine(str); str = StringFormat("{0:p}", v2); ConsoleWriteLine(str); str = StringFormat("{0:X}", x); ConsoleWriteLine(str); str = StringFormat("{0:D12}", x); ConsoleWriteLine(str); str = StringFormat("{0:C}", 18999); ConsoleWriteLine(str); } }
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Like WriteLine( ), StringFormat( ) lets you embed regular text along with format specifiers, and you can use more than one format item and value For example, consider this program, which displays the running sum and product of the numbers 1 through 10:
// A closer look at Format() using System; class FormatDemo2 { static void Main() { int i; int sum = 0; int prod = 1; string str;
22:
Strings and Formatting
// Display the running sum and product for the // numbers 1 through 10 for(i=1; i <= 10; i++) { sum += i; prod *= i; str = StringFormat("Sum:{0,3:D} Product:{1,8:D}", sum, prod); ConsoleWriteLine(str); } } }
The output is shown here:
Sum: Sum: Sum: Sum: Sum: Sum: Sum: Sum: Sum: Sum: 1 3 6 10 15 21 28 36 45 55 Product: 1 Product: 2 Product: 6 Product: 24 Product: 120 Product: 720 Product: 5040 Product: 40320 Product: 362880 Product: 3628800
PART II
In the program, pay close attention to this statement:
str = StringFormat("Sum:{0,3:D} sum, prod); Product:{1,8:D}",
This call to Format( ) contains two format items, one for sum and one for prod Notice that the argument numbers are specified just as they are when using WriteLine( ) Also, notice that regular text, such as Sum: is included This text is passed through and becomes part of the output string
Using ToString( ) to Format Data
For all of the built-in numeric structure types, such as Int32 or Double, you can use ToString( ) to obtain a formatted string representation of the value To do so, you will use this general form of ToString( ): ToString( format string ) It returns the string representation of the invoking object as specified by the format specifier passed in format string For example, the following program creates a monetary representation of the value 18899 through the use of the C format specifier:
string str = 18999ToString("C");
Notice how the format specifier is passed directly to ToString( ) Unlike embedded format commands used by WriteLine( ) or Format( ), which supply an argument-number and fieldwidth component, ToString( ) requires only the format specifier, itself
Part II:
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