Language Contrast: C++String Concatenation at Compile Time in Visual C#

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Language Contrast: C++String Concatenation at Compile Time
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Unlike C++, C# does not automatically concatenate literal strings You cannot, for example, specify a string literal as follows: "Major Strasser has been shot " "Round up the usual suspects"
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Rather, concatenation requires the use of the addition operator (If the compiler can calculate the result at compile time, the resulting CIL code will be a single string)
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If the same literal string appears within an assembly multiple times, the compiler will define the string only once within the assembly and all variables will point to the single string literal That way, if the same string literal containing thousands of characters was placed multiple times into the code, the resulting assembly would reflect the size of only one of them
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String Methods
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The string type, like the SystemConsole type, includes several methods There are methods, for example, for formatting, concatenating, and comparing strings The Format() method in Table 25 behaves exactly like the ConsoleWrite() and ConsoleWriteLine() methods, except that instead of displaying the result in the console window, stringFormat() returns the result All of these methods are static This means that, to call the method, it is necessary to prefix the method name with the type that contains the method Some of the methods in the string class, however, are instance methods Instead of prefixing the method with the type, instance methods use the variable name (or some other reference to an instance) Table 26 shows a few of these methods, along with an example
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Table 25 string Static Methods
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Statement
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Example [View full width] string text, firstName, lastName; text = stringFormat("Your full name is{0} {1}", firstName, lastName); // Display //"Your full name is //<firstName> <lastName>" SystemConsoleWriteLine(text);
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void static stringFormat( string format, )
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void static stringConcat( string str0, string str1)
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string text, firstName, lastName; text = stringConcat(firstName, lastName); // Display "<firstName><lastName>", notice // that there is no space between names SystemConsoleWriteLine(text);
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static int stringCompare( string str0, string str1)
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string option; // String comparison in which // case matters int result = stringCompare(option,"/help"); // Display: // 0 if equal // negative if option < /help // positive if option > /help SystemConsoleWriteLine(result);
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string option; // Case-insensitive string comparison int result = stringCompare( option, "/Help", true); // Display: // 0 if equal // < 0 if option < /help // > 0 if option > /help SystemConsoleWriteLine(result);
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Table 26 string Instance Methods
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Statement Example
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bool StartsWith( string value) bool EndsWith( string value)
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string lastName bool isPhd = lastNameEndsWith("PhD"); bool isDr = lastNameStartsWith("Dr");
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string ToLower() string ToUpper()
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string severity = "warning"; // Display the severity in uppercase SystemConsoleWriteLine( severityToUpper());
string string string string
Trim() Trim() TrimEnd() TrimStart()
// Remove any whitespace at the start // or end username = usernameTrim();
string Replace( string oldValue, string newValue)
string filename; // Remove 's altogether from the string filename = filenameReplace(" ", "");;
Advanced Topic: C# Properties
Technically, the Length member referred to in the following section is not actually a method, as indicated by the fact that there are no parentheses following its call Length is a property of string, and C# syntax allows access to a property as though it were a member variable (known in C# as a field) In other words, a property has the behavior of special methods called setters and getters, but the syntax for accessing that behavior is that of a field Examining the underlying CIL implementation of a property reveals that it compiles into two methods: set_<PropertyName> and get_<PropertyName> Neither of these, however, is directly accessible from C# code, except through the C# property constructs
String Length
To determine the length of a string you use a string member called Length This particular member is called a read-only property As such, it can't be set, nor does calling it require any parameters Listing 213 demonstrates how to use the Length property, and Output 211 shows the results