C # Custom Function netxtstring Generate random string

This example shows the C # Custom function Netxtstring Implementation of the method of generating random strings, in the development of C # project is very practical! Share to everyone for your reference.

First, generate a random string

The key code is as follows:

<summary>///generate random string///</summary>///<param name= "random" >random</param>///<param Name= "Size" > string length </param>///<param name= "lowercase" > string is lowercase </param>///<returns> random string </returns>public static string netxtstring (this random random, int size, bool lowercase) {  StringBuilder _ Builder = new StringBuilder (size);  int _startchar = lowercase? 97:65;//65 = A/97 = A for  (int i = 0; i < size; i++) _builder. Append ((char) (* random. Nextdouble () + _startchar));  Return _builder. ToString ();}

The test code is as follows:

static void Main (string[] args) {  try  {random _random = new Random (); for (int i = 0; i <; i++) {   Consol E.writeline (_random.netxtstring (4, false)); }  }  catch (Exception ex)  {Console.WriteLine (ex). Message);  }  Finally  {console.readline ();  }}

The test results are as follows:

Generate random strings based on specified characters

The key code is as follows:

///<summary>///0~9 a~z string///</summary>public static string Randomstring_ 09AZ = "0123456789ABCDEFGHIJKMLNOPQRSTUVWXYZ";///<summary>///generates a random string based on the specified string///</summary>///< param name= "random" >random</param>///<param name= "RandomString" > Specify string </param>///<param Name= "Size" > string length </param>///<param name= "lowercase" > string is lowercase </param>///<returns> random string </returns>public static string netxtstring (this random random, string randomstring, int size, bool lowercase) {Stri ng _nextstring = string.  Empty; if (random! = null &&!string.  IsNullOrEmpty (RandomString)) {StringBuilder _builder = new StringBuilder (size); int _maxcount = randomstring.length-1; for (int i = 0; i < size; i++) {int _number = random.   Next (0, _maxcount); _builder. Append (Randomstring[_number]); } _nextstring = _builder.  ToString (); } return lowercase? _nextstring.tolower (): _nextstring.toupper ();} 
 

The test code is as follows:

static void Main (string[] args) {  try  {random _random = new Random (); string _ramdomstring = Randomtoolv2.randomst Ring_09az; for (int i = 0; i <; i++) {   //Console.WriteLine (_random.netxtstring (4, false));   Console.WriteLine (_random.netxtstring (_ramdomstring, 4, false)); }  }  catch (Exception ex)  {Console.WriteLine (ex). Message);  }  Finally  {console.readline ();  }}

The code works as shown in the following:

I hope that the examples described in this article can help you in C # learning!

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C # Custom Function netxtstring Generate random string

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C # Custom Function netxtstring Generate random string