What do you know about strings in. NET ?,. NET string

What do you know about strings in. NET ?,. NET string
Character string features

1. ImmutableBecause the string is unchangeable, each time you modify the string, you create a separate string copy (copy a string copy ). The only difference is that it points to a new address. Ps: vs2005 instant window & variable, get the address .. If the window * variable is above vs2010, only the heap address is used.2. String pool (for string constants only)When a program has multiple identical string constants, multiple variables point to the same string in memory! This feature is called a string pool. The reason why the string does not cause program confusion is that the string is non-mutable.

PS: There are many reload methods, which are not listed one by one.
1. Contains (String str)Determines whether a string contains the specified string.
Usage
String str = "helloworld ";
Str. Contains ("hello"); // true
2. StartsWith (String str)
Determines whether the string object starts with a specified string.
3. EndWith (String str)
Determines whether the string object ends with a specified string.
4. Length attribute
Returns the length of a string.
5. IndexOf (String str) 
Obtains the position of the first occurrence of the specified character/string... in the object string.
6. LastIndexOf (String str)
Obtains the position of the last occurrence of the specified character/string... in the object string.
7. SubString (int start)
SubString (int strat, int length)Truncates a string from a specified position.
8. ToLower ()
Converts a string to lowercase and returns a new string in full lowercase.
9. ToUpper ()
Converts a string to uppercase and returns a new string in uppercase.
10. Replace (string oldStr, string newStr)
Replace the old part of the object string with a new string.
11. Trim ()Removes spaces at both ends of an object string.
TrimStart () removes spaces starting with an object string
TrimEnd () removes spaces at the end of the object string
PS: If you want to remove other starting and ending characters and other characters, you can use other overload of Trim.
12. Split ()Splits an object string into a String Array Based on specified characters!
Split () has the same heavy load,
For example, Split (new char [] {'|'}, StringSplitOption. RemoveEmptyEntries) // Delete NULL data

1. IsNullOrEmpty (string)
// String. IsNullOrEmpty (str1) determines whether a string is null or a null string.
2. Equals (string, string, StringComparison. OrdianlIgnore)Ignore case sensitivity to compare whether the two strings are the same.3. Join (string, string [])Concatenates an array into a string based on the specified string.