将13位图书条码转换为ISBN-10(2007年以前图书)的方法

将13位图书条码转换为ISBN-10(2007年以前图书)的方法

          /// 
        
/// 2007年前图书13条码转换成ISBN-10位方法
    
/// 

        
/// 13位条形码
        
/// 10位isbn编号

         public   static   string  GetISBN10( string  Isbn13)
        
{
            
if ( Isbn13.Length == 13 )
            
{
                
string Location4 = Isbn13.Substring(3 , 1);
                
string Location5 = Isbn13.Substring(4 , 1);
                
string Location6 = Isbn13.Substring(5 , 1);
                
string Location7 = Isbn13.Substring(6 , 1);
                
string Location8 = Isbn13.Substring(7 , 1);
                
string Location9 = Isbn13.Substring(8 , 1);
                
string Location10 = Isbn13.Substring(91);
                
string Location11 = Isbn13.Substring(101);
                
string Location12 = Isbn13.Substring(11 , 1);
                
string location13 = Isbn13.Substring(11 , 1);
               
                
int loc12 = Convert.ToInt16(Location12);
                
int loc11 = Convert.ToInt16(Location11);
                
int loc10 = Convert.ToInt16(Location10);
                
int loc9  = Convert.ToInt16(Location9);
                
int loc8  = Convert.ToInt16(Location8);
                
int loc7  = Convert.ToInt16(Location7);
                
int loc6  = Convert.ToInt16(Location6);
                
int loc5  = Convert.ToInt16(Location5);
                
int loc4  = Convert.ToInt16(Location4);
                
int isbnSum =10 -( loc4 * 10 + loc5 * 9 + loc6 * 8 + loc7 * 7 + loc8 * 6 + loc9 * 5 + loc10 * 4 + loc11 * 3 + loc12 * 2)%11;
                
if ( isbnSum == 0 )
                
{
                    location13 
= "0";
                }

                
else
                
{
                    
if ( isbnSum == 1 )
                    
{
                        location13 
= "X";
                    }

                    
else
                    
{
                        isbnSum 
= 11 - isbnSum;
                        location13 
= isbnSum.ToString();
                    }

                }

                
return Location4 + Location5 + Location6 + Location7 + Location8 + Location9 + Location10 + Location11 + Location12 + location13;
            }

        }

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