Csharp/C#教程：C# String Replace高效的实例方法分享

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[ThreadStatic]
       staticchar[]mTempChars;
       protectedstaticchar[]GetTempData()
       {
           if(mTempChars==null)
               mTempChars=newchar[1024*64];
           returnmTempChars;
       }
       publicstaticstringReplace(stringvalue,stringoldData,stringnewData)
       {
           char[]tmpchars=GetTempData();
           intnewpostion=0;
           intoldpostion=0;
           intlength=value.Length;
           intoldlength=oldData.Length;
           intnewlength=newData.Length;
           intindex=0;
           intcopylength=0;
           booleq=false;
           while(index<value.Length)
           {
               eq=true;
               for(intk=0;k<oldlength;k++)
               {
                   if(value[index+k]!=oldData[k])
                   {
                       eq=false;
                       break;
                   }
               }
               if(eq)
               {
                   copylength=index-oldpostion;
                   value.CopyTo(oldpostion,tmpchars,newpostion,copylength);
                   newpostion+=copylength;
                   index+=oldlength;
                   oldpostion=index;
                   newData.CopyTo(0,tmpchars,newpostion,newlength);
                   newpostion+=newlength;
 &n bsp;             }
               else
               {
                   index++;
               }
           }
           if(oldpostion<length)
           {
               copylength=index-oldpostion;
               value.CopyTo(oldpostion,tmpchars,newpostion,copylength);
               newpostion+=copylength;
           }
           returnnewstring(tmpchars,0,newpostion);
       }
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