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In any case, we recommend that you call an overload that has a String Comparison parameter.
Ordinal)); // The example displays the following output: // Comparing 'Aa' (00 41 00 61) and 'A a' (00 41 00 00 00 00 00 00 00 61): // With String. The results may look odd in most contexts if displayed to users. Equals overloads that do not include a String Comparison argument (including the equality operator).
One criterion involves using the conventions of the current culture when comparing strings. Subtle and not so subtle bugs can emerge when non-linguistic string data is interpreted linguistically, or when string data from a particular culture is interpreted using the conventions of another culture. However, the Turkish ("tr-TR") alphabet includes an "I with a dot" character "İ" (\u0130), which is the capital version of "i". As a result, in culture-sensitive comparisons, strings that contain embedded null characters can be considered equal to strings that do not. Equals: // Current Culture: True // Invariant Culture: True Module Example Public Sub Main() Dim str1 As String = "Aa" Dim str2 As String = "A" New String(Convert. Write Line("Comparing '' () and '' ():", _ str1, Show Bytes(str1), str2, Show Bytes(str2)) Console.
Comparisons that are based on the current culture use the thread's current culture or locale. Turkish also includes a lowercase "i without a dot" character, "ı" (\u0131), which capitalizes to "I". Important Although string comparison methods disregard embedded null characters, string search methods such as String.
In general, we recommend that you call a method that does not rely on defaults, because it makes the intent of the code unambiguous. Invariant Culture)) End Sub Private Function Show Bytes(str As String) As String Dim hex String As String = String. Length - 1) For Each name As String In names Me.stored Names(index) = name index = 1 Next Array. Binary Search(Me.stored Names, name, String Comparer. Ordinal) If this data is persisted and moved across cultures, and sorting is used to present this data to the user, you might consider using String Comparison.
If the data to be compared is non-linguistic, using the default overloads can produce undesirable results, as the following attempt to perform a case-insensitive comparison of the strings "file" and "FILE" illustrates.
For example, strings that are used internally by an application typically should be handled identically across all cultures. Any case differences among these translated characters are ignored. As the following example shows, this behavior differs from ordinal comparison. As the operation most central to string interpretation, all instances of these method calls should be examined to determine whether strings should be interpreted according to the current culture, or dissociated from the culture (symbolically). Compare Info property, also includes a Compare method that provides a large number of matching options (ordinal, ignoring white space, ignoring kana type, and so on) by means of the Compare Options flag enumeration. It is usually possible to convert this method to the recommended String. Types that implement the IComparable and IComparable interfaces implement this method. By default, both of these methods perform a culture-sensitive comparison. The String Comparer class includes six static properties that return String Comparer instances whose String Comparer.
When culturally independent string data, such as XML tags, HTML tags, user names, file paths, and the names of system objects, are interpreted as if they were culture-sensitive, application code can be subject to subtle bugs, poor performance, and, in some cases, security issues. string separated = "\u0061\u030a"; string combined = "\u00e5"; Console. Write Line("Equal sort weight of and using Ordinal: ", separated, combined, String. Ordinal) == 0); // The example displays the following output: // Equal sort weight of a° and å using Invariant Culture: True // Equal sort weight of a° and å using Ordinal: False Dim separated As String = Chr W(&h61) Chr W(&h30a) Dim combined As String = Chr W(&he5) Console. Write Line("Equal sort weight of and using Ordinal: ", _ separated, combined, _ String. Ordinal) = 0) ' The example displays the following output: ' Equal sort weight of a° and å using Invariant Culture: True ' Equal sort weight of a° and å using Ordinal: False When interpreting file names, cookies, or anything else where a combination such as "å" can appear, ordinal comparisons still offer the most transparent and fitting behavior. Back to top The following sections describe the methods that are most commonly used for string comparison. Typically, it is the latter, and a String Comparison. Because it does not offer the option of a String Comparison parameter, implementing types often let the user specify a String Comparer in their constructor. To Lower methods described in the previous section. Compare methods perform the following types of string comparisons: Default interpretation: String Comparison. When you store any data in a collection, or read persisted data from a file or database into a collection, switching the current culture can invalidate the invariants in the collection. Binary Search method assumes that the elements in the array to be searched are already sorted. Using a culture-sensitive comparer can be dangerous if the culture changes between the time that the array is sorted and its contents are searched.
Most of the methods that do not rely on defaults include a parameter of type String Comparison, which is an enumeration that explicitly specifies rules for string comparison by culture and case. However, we still recommend that you call an overload that explicitly specifies the String Comparison type even if you want to perform an ordinal comparison; this makes it easier to search code for a certain string interpretation. If so, consider using a case-insensitive comparison. The change code is reflected in the lines labeled ' Correct.
The following table describes the String Comparison enumeration members. Dim stored Names() As String Public Sub Store Names(names() As String) Dim index As Integer = 0 Re Dim stored Names(names. End Sub Public Function Does Name Exist(name As String) As Boolean Return Array.
Dim protocol As String = Get Protocol(url) If String. Additionally, comparison implicitly defines equality. The comparison operation returns zero for strings it deems equal. The following example instantiates a Hashtable object by passing it the String Comparer object that is returned by the String Comparer. Because a class String Comparer that is derived from String Comparer implements the IEquality Comparer interface, its Get Hash Code method is used to compute the hash code of strings in the hash table.