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StringComparison is an enumeration that defines the values shown in Table 22-2 Using these values, it is possible to craft a comparison that meets the specific needs of your application Thus, the addition of the StringComparison parameter expands the capabilities of Compare( ) and other methods, such as Equals( ) It also lets you specify in an unambiguous way precisely what type of comparison you intend Because of the differences between culture-sensitive and ordinal comparisons, it important to be as clear as possible in this regard For this reason, the examples in this book will explicitly specify the StringComparison parameter in calls to methods that support such a parameter In all cases, Compare( ) returns less than zero when the first string is less than the second, greater than zero when the first string is greater than the second, and zero when the two strings compare as equal Even though Compare( ) returns zero when it determines two strings are equal, it is usually better to use Equals( ) (or the = = operator) to determine equality The reason is that Compare( ) determines equality based on sort order When a culture-sensitive comparison is performed, two strings might compare as equal in terms of sort order, but not be equal otherwise By default, Equals( ) determines equality based on the ordinal values of the characters and is culture-insensitive Thus, by default, it compares two strings for absolute, character-by-character equality Thus, it works like the = = operator Although Compare( ) is more versatile, when performing simple ordinal comparisons, the CompareOrdinal( ) method is a bit easier to use Finally, notice that CompareTo( ) performs only a culture-sensitive comparison At the time of this writing, there is no overload that lets you specify a different approach The following program demonstrates Compare( ), Equals( ), CompareOrdinal( ), and the = = and != operators Notice that the first two comparisons clearly show the difference
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Value CurrentCulture CurrentCultureIgnoreCase InvariantCulture InvariantCultureIngoreCase Ordinal
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Description Comparisons are performed using the currently active cultural settings Case-insensitive comparisons are performed using the currently active cultural settings Comparisons are performed using an invariant (that is, universal and unchanging) culture Case-insensitive comparisons are performed using an invariant (that is, universal and unchanging) culture Comparisons are performed using the ordinal values of the characters in the string Thus, dictionary-order may not result and cultural conventions are ignored Case-insensitive comparisons are performed using the ordinal values of the characters in the string Thus, dictionary-order may not result and cultural conventions are ignored
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OrdinalIgnoreCase
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TABLE 22-2
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The StringComparison Enumeration Values
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between culture-sensitive comparisons and ordinal comparisons in an English-language environment
// Demonstrate string comparisons using System; class CompareDemo { static void Main() { string str1 = "alpha"; string str2 = "Alpha"; string str3 = "Beta"; string str4 = "alpha"; string str5 = "alpha, beta"; int result; // First, demonstrate the differences between culture-sensitive // and ordinal comparison result = StringCompare(str1, str2, StringComparisonCurrentCulture); ConsoleWrite("Using a culture-sensitive comparison: "); if(result < 0) ConsoleWriteLine(str1 + " is less than " + str2); else if(result > 0) ConsoleWriteLine(str1 + " is greater than " + str2); else ConsoleWriteLine(str1 + " equals " + str2); result = StringCompare(str1, str2, StringComparisonOrdinal); ConsoleWrite("Using an ordinal comparison: "); if(result < 0) ConsoleWriteLine(str1 + " is less than " + str2); else if(result > 0) ConsoleWriteLine(str1 + " is greater than " + str2); else ConsoleWriteLine(str1 + " equals " + str4); // Use the CompareOrdinal() method result = StringCompareOrdinal(str1, str2); ConsoleWrite("Using CompareOrdinal(): "); if(result < 0) ConsoleWriteLine(str1 + " is less than " + str2); else if(result > 0) ConsoleWriteLine(str1 + " is greater than " + str2); else ConsoleWriteLine(str1 + " equals " + str4); ConsoleWriteLine(); // Use == to determine if two strings are equal // This comparison is ordinal if(str1 == str4) ConsoleWriteLine(str1 + " == " + str4); // Use != on strings if(str1 != str3) ConsoleWriteLine(str1 + " != " + str3); if(str1 != str2) ConsoleWriteLine(str1 + " != " + str2);
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