generate 2d barcode vb.net Chars, Strings, and Working with Text in C#.NET

Generation PDF417 in C#.NET Chars, Strings, and Working with Text

14 Chars, Strings, and Working with Text
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In C#, you can t use the new operator to construct a String object from a literal string:
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using System; public static class Program { public static void Main() { String s = new String("Hi there."); Console.WriteLine(s); } }
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// <-- Error
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Instead, you must use the following simplified syntax:
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using System; public static class Program { public static void Main() { String s = "Hi there."; Console.WriteLine(s); } }
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If you compile this code and examine its IL (using ILDasm .exe), you d see the following:
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.method public hidebysig static void Main() cil managed { .entrypoint // Code size 13 (0xd) .maxstack 1 .locals init (string V_0) IL_0000: ldstr "Hi there." IL_0005: stloc.0 IL_0006: ldloc.0 IL_0007: call void [mscorlib]System.Console::WriteLine(string) IL_000c: ret } // end of method Program::Main
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The newobj IL instruction constructs a new instance of an object . However, no newobj instruction appears in the IL code example . Instead, you see the special ldstr (load string) IL instruction, which constructs a String object by using a literal string obtained from metadata . This shows you that the common language runtime (CLR) does, in fact, have a special way of constructing literal String objects . If you are using unsafe code, you can construct a String object from a Char* or SByte* . To accomplish this, you would use C# s new operator and call one of the constructors provided by the String type that takes Char* or SByte* parameters . These constructors create a String object, initializing the string from an array of Char instances or signed bytes . The other constructors don t have any pointer parameters and can be called using safe (verifiable) code written in any managed programming language .
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Part III Essential Types
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C# offers some special syntax to help you enter literal strings into the source code . For special characters such as new lines, carriage returns, and backspaces, C# uses the escape mechanism familiar to C/C++ developers:
// String containing carriage-return and newline characters String s = "Hi\r\nthere.";
Important Although the preceding example hard-codes carriage-return and newline characters
into the string, I don t recommend this practice . Instead, the System.Environment type defines a read-only NewLine property that returns a string consisting of these characters when your application is running on Microsoft Windows . However, the NewLine property is platform sensitive, and it returns the appropriate string required to obtain a newline by the underlying platform . So, for example, if the Common Language Infrastructure (CLI) is ported to a UNIX system, the NewLine property would return a string consisting of just a single character \n . Here s the proper way to define the previous string so that it works correctly on any platform:
String s = "Hi" + Environment.NewLine + "there.";
You can concatenate several strings to form a single string by using C# s + operator as follows:
// Three literal strings concatenated to form a single literal string String s = "Hi" + " " + "there.";
In this code, because all of the strings are literal strings, the C# compiler concatenates them at compile time and ends up placing just one string "Hi there." in the module s metadata . Using the + operator on nonliteral strings causes the concatenation to be performed at runtime . To concatenate several strings together at runtime, avoid using the + operator because it creates multiple string objects on the garbage-collected heap . Instead, use the System.Text.StringBuilder type (which I ll explain later in this chapter) . Finally, C# also offers a special way to declare a string in which all characters between quotes are considered part of the string . These special declarations are called verbatim strings and are typically used when specifying the path of a file or directory or when working with regular expressions . Here is some code showing how to declare the same string with and without using the verbatim string character (@) .
// Specifying the pathname of an application String file = "C:\\Windows\\System32\\Notepad.exe"; // Specifying the pathname of an application by using a verbatim string String file = @"C:\Windows\System32\Notepad.exe";
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