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static int Compare(string strA, string strB, StringComparison comparisonType)
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Returns less than zero if strA is less than strB, greater than zero if strA is greater than strB, and zero if the strings are equal How the comparison is conducted is specified by comparisonType Returns true if the invoking string is the same as value How the comparison is conducted is specified by comparisonType Searches the invoking string for the first occurrence of the character specified by value An ordinal search is used Returns the index of the first match, or 1 on failure Searches the invoking string for the first occurrence of the substring specified by value How the search is conducted is specified by comparisonType Returns the index of the first match, or 1 on failure Searches the invoking string for the last occurrence of the character specified by value An ordinal search is used Returns the index of the first match, or 1 on failure Searches the invoking string for the last occurrence of the substring specified by value How the search is conducted is specified by comparisonType Returns the index of the last match, or 1 on failure Returns a lowercase version of the invoking string How the conversion is performed is specified by culture Returns an uppercase version of the invoking string How the conversion is performed is specified by culture
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bool Equals(string value, StringComparison comparisonType) int IndexOf(char value)
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int IndexOf(string value, StringComparison comparisonType)
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int LastIndexOf(char value)
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int LastIndexOf(string value, StringComparison comparisonType)
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string ToLower( CultureInfoCurrentCulture culture) string ToUpper( CultureInfoCurrentCulture culture)
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A Sampling of Common String Handling Methods
7:
Arrays and Strings
To obtain the value of an individual character of a string, you simply use an index For example:
PART I
string str = "test"; ConsoleWriteLine(str[0]);
This displays t , the first character of test Like arrays, string indexes begin at zero One important point, however, is that you cannot assign a new value to a character within a string using an index An index can only be used to obtain a character You can use the = = operator to test two strings for equality Normally, when the = = operator is applied to object references, it determines if both references refer to the same object This differs for objects of type string When the = = is applied to two string references, the contents of the strings themselves are compared for equality The same is true for the != operator: when comparing string objects, the contents of the strings are compared In both cases, an ordinal comparison is performed To test two strings for equality using cultural information, use Equals( ) and specify the comparison approach, such as StringComparisonCurrentCulture One other point: the Compare( ) method is intended to compare strings to determine an ordering relationship, such as for sorting To test for equality, use Equals( ) or the string operators Here is a program that demonstrates several string operations:
// Some string operations using System; using SystemGlobalization; class StrOps { static void Main() { string str1 = "When it comes to NET programming, C# is #1"; string str2 = "When it comes to NET programming, C# is #1"; string str3 = "C# strings are powerful"; string strUp, strLow; int result, idx; ConsoleWriteLine("str1: " + str1); ConsoleWriteLine("Length of str1: " + str1Length); // Create upper- and lowercase versions of str1 strLow = str1ToLower(CultureInfoCurrentCulture); strUp = str1ToUpper(CultureInfoCurrentCulture); ConsoleWriteLine("Lowercase version of str1:\n " + strLow); ConsoleWriteLine("Uppercase version of str1:\n " + strUp); ConsoleWriteLine(); // Display str1, one char at a time ConsoleWriteLine("Display str1, one char at a time"); for(int i=0; i < str1Length; i++) ConsoleWrite(str1[i]); ConsoleWriteLine("\n");
Part I:
The C# Language
// Compare strings using == and != These comparisons are ordinal if(str1 == str2) ConsoleWriteLine("str1 == str2"); else ConsoleWriteLine("str1 != str2"); if(str1 == str3) ConsoleWriteLine("str1 == str3"); else ConsoleWriteLine("str1 != str3"); // This comparison is culture-sensitive result = stringCompare(str1, str3, StringComparisonCurrentCulture); if(result == 0) ConsoleWriteLine("str1 and str3 are equal"); else if(result < 0) ConsoleWriteLine("str1 is less than str3"); else ConsoleWriteLine("str1 is greater than str3"); ConsoleWriteLine(); // Assign a new string to str2 str2 = "One Two Three One"; // Search a string idx = str2IndexOf("One", StringComparisonOrdinal); ConsoleWriteLine("Index of first occurrence of One: " + idx); idx = str2LastIndexOf("One", StringComparisonOrdinal); ConsoleWriteLine("Index of last occurrence of One: " + idx); } }
This program generates the following output:
str1: When it comes to NET programming, C# is #1 Length of str1: 44 Lowercase version of str1: when it comes to net programming, c# is #1 Uppercase version of str1: WHEN IT COMES TO NET PROGRAMMING, C# IS #1 Display str1, one char at a time When it comes to NET programming, C# is #1 str1 == str2 str1 != str3 str1 is greater than str3 Index of first occurrence of One: 0 Index of last occurrence of One: 14
Before moving on, in the program notice that Compare( ) is called as shown here:
result = stringCompare(str1, str3, StringComparisonCurrentCulture);
7:
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