Speaking from the location:
1.String is a string inside the. NET framework, and a lowercase string is a string in the C # language
2. If the using System is removed, there is no uppercase string, System is a function name in the. NET Framework class Library.
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from Sex Quality:
1.string is a keyword, string is a class, String cannot be the name of a class, struct, enumeration, field, variable, method, property,
3.string type represents a string of Unicode characters, string is Alias for string in the. NET Framework, more intuitive testing of string equality
String Details:
Description of String on MSDN: string is a alias for string in the. NET Framework
Hehe string is the alias of String, is a.
string s = String. Empty: A string variable that points to an empty string, and S does not occupy storage space. s variables can be used, such as S. lengthstring s = ""; an empty string pointing to "s", which takes up a byte of storage space, because the escape character, "N", represents the end of the string. lengthstring s = null; A variable that does not refer to any of the storage spaces, s cannot be used
The difference between string and string (C #)