C#随机

public  class  GetRandom
    
{
        
public static int roCount = 0;
        
private static char[] constant = 

    
'2','3','4','5','6','7','8','9'
    
'a','b','c','d','e','f','g','h','i','j','k','m','n','p','q','r','s','t','u','v','w','x','y','z'
    
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z' 
//     由下面所列的字符抽取,如果为了避免出现一些容易混淆的字符,上面的已经筛选
//    '0','1','2','3','4','5','6','7','8','9', 
//        'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z', 
//        'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z' 

}

        
public enum RandomType 
        

            All, 
            Number, 
            Uppercased, 
            Lowercased, 
            NumberAndUppercased, 
            NumberAndLowercased, 
            UppercasedAndLowercased, 




        }
 
        
public static string GenerateRandom(int Length,RandomType rt) 
        

            
int initsize=0
            
int beginsize = 0
            
int endsize=0
            Boolean IsCross
=false
            
switch (rt) 
            

                
case RandomType.All: 
                

                    initsize 
= constant.Length; //constant数组的最大个数
                    beginsize = 1//constant数组的开始下标
                    endsize = constant.Length; //constant数组的结束下标
                    
//IsCross = false; 
                    break
                }
 
                
case RandomType.Lowercased: 
                

                    initsize 
= 24//少了2个小写L,0
                    beginsize = 9
                    endsize 
= 32
                    
//IsCross = false; 
                    break
                }
 
                
case RandomType.Uppercased: 
                

                    initsize 
= 25//
                    beginsize = 33
                    endsize 
= constant.Length; //constant数组的结束下标
                    
// IsCross = false; 
                    break
                }
 
                
case RandomType.Number: 
                

                    initsize 
= 8
                    beginsize 
= 1
                    endsize 
= 8
                    
//IsCross = false; 
                    break
                }
 
                
case RandomType.UppercasedAndLowercased: 
                

                    initsize 
= constant.Length-8
                    beginsize 
= 9
                    endsize 
= constant.Length; //constant数组的结束下标
                    
//IsCross = false; 
                    break
                }
 
                
case RandomType.NumberAndLowercased: 
                

                    initsize 
= 32
                    beginsize 
= 1
                    endsize 
= 32
                    
//IsCross = false; 
                    break
                }
 
                
case RandomType.NumberAndUppercased: 
                

                    IsCross 
= true
                    
break
                }
 
            }
 



            System.Text.StringBuilder newRandom 
= new System.Text.StringBuilder(initsize); 
            Random rd 
= new Random(unchecked(roCount * (int)DateTime.Now.Ticks));
            roCount
++;

            
if (!IsCross) 
            

                
for (int i = 0; i < Length; i++
                

                    newRandom.Append(constant[rd.Next(beginsize, endsize)]); 
                }
 
            }
 
            
else 
            

                
for (int i = 0; i < Length; i++
                

                    newRandom.Append(constant[rd.Next(
18)]); 
                    newRandom.Append(constant[rd.Next(
33, constant.Length)]); 
                }
 
            }
 

            
return newRandom.ToString(); 
        }
 

    }

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