Thus on mine arm, most soothing sweet it is String text = pensive SARA ! thy soft cheek reclined The following example shows some common uses for verbatim strings: string filePath = C:\Users\scoleridge\Documents\ Use double quotation marks to embed a quotation mark inside a verbatim string. Because verbatim strings preserve new line characters as part of the string text, they can be used to initialize multiline strings. Use verbatim strings for convenience and better readability when the string text contains backslash characters, for example in file paths. Output: "The Æolean Harp", by Samuel Taylor Coleridge String title = "\"The \u00C6olean Harp\", by Samuel Taylor Coleridge" Use regular string literals when you must embed escape characters provided by C#, as shown in the following example: string columns = "Column 1\tColumn 2\tColumn 3"
#How to use si string section how to
The following code illustrates this behavior: string s1 = "Hello " įor more information about how to create new strings that are based on modifications such as search and replace operations on the original string, see How to modify string contents. If you create a reference to a string, and then "modify" the original string, the reference will continue to point to the original object instead of the new object that was created when the string was modified. Output: A string is more than the sum of its chars.īecause a string "modification" is actually a new string creation, you must use caution when you create references to strings. string object and stores it in s1, releasing the String s2 = "than the sum of its chars."
That new object is assigned to the variable s1, and the original object that was assigned to s1 is released for garbage collection because no other variable holds a reference to it. The += operator creates a new string that contains the combined contents. In the following example, when the contents of s1 and s2 are concatenated to form a single string, the two original strings are unmodified. All of the String methods and C# operators that appear to modify a string actually return the results in a new string object. String objects are immutable: they cannot be changed after they have been created. Use the static IsNullOrEmpty(String) method to verify the value of a string before you try to access it. By initializing strings with the Empty value instead of null, you can reduce the chances of a NullReferenceException occurring. The string literal representation of a zero-length string is "". Initialize a string with the Empty constant value to create a new String object whose string is of zero length. Note that you do not use the new operator to create a string object except when initializing the string with an array of chars. System.String documentation for details. a string from a char*, char, or sbyte*. Use the String constructor only when creating being used to store another string value.Ĭonst string message4 = "You can't get rid of me!" Use a const string to prevent 'message4' from Var temp = "I'm still a strongly-typed System.String!" String newPath = Files\Microsoft Visual Studio 9.0" Initialize with a verbatim string literal. String oldPath = "c:\\Program Files\\Microsoft Visual Studio 8.0" Initialize with a regular string literal. Use the Empty constant instead of the literal "". You can declare and initialize strings in various ways, as shown in the following example: // Declare without initializing. For more information about the type and its methods, see String. For more information about the keyword, see string. In addition, the C# language overloads some operators to simplify common string operations. The String class provides many methods for safely creating, manipulating, and comparing strings. Therefore, String and string are equivalent, regardless it is recommended to use the provided alias string as it works even without using System. In C#, the string keyword is an alias for String. To access the individual Unicode code points in a string, use the StringInfo object. The Length property of a string represents the number of Char objects it contains, not the number of Unicode characters. There is no null-terminating character at the end of a C# string therefore a C# string can contain any number of embedded null characters ('\0').
Internally, the text is stored as a sequential read-only collection of Char objects. A string is an object of type String whose value is text.
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