C #. NET technology insider 03-string

1. String and stringbuilder

• The string is immutable. In fact, after the two strings are connected, a new string is generated. Therefore, when a large number of strings are used, the performance is reduced.
• Stringbuilder can efficiently use strings. The namespace is system. Text. When a string is accumulated, new objects are not generated every time. Therefore, many construction operations do not affect the performance of a string.

Escape characters

• When a string contains tabs and backslash characters, you must use an escape sequence or add @ to the string signature @.

Common stringbuilder Methods:

• append : append string. Multiple overload methods are available.
• appendformat : append formatted strings.
• insert (insert index location, inserted value ).
• replace : You can create a string template first, and then replace it with a specific one. For example, you can do this when writing SQL statements.
• remove (start index position, length of the characters to be removed ).