Delete a piece of data from a large log file

usingSystem;usingSystem.IO;usingSystem.Linq;usingSystem.Text;namespacetestmultyconsole2{ Public classLocalfilehelper {/// <summary>        ///Delete some data from a large log file/// </summary>        /// <param name= "FilePath" >source file path</param>        /// <param name= "Newfilepath" >Destination file path</param>        /// <param name= "key" >Delete data between keys (contains key)</param>        /// <param name= "words" >Delete a row of data that contains the data in the list</param>         Public Static voidCopycontentanddeletesomething (stringFilePath,stringNewfilepath,stringKeystring[] words) {            BOOLFlag =false;//identifiers            LongCount =0;//counter            using(StreamReader sr =NewStreamReader (FilePath, Encoding.GetEncoding ("gb2312")))            using(StreamWriter StreamWriter =NewStreamWriter (Newfilepath,true, Encoding.GetEncoding ("gb2312")))            {                 while(Sr.) Peek () >=0)                {                    stringTMP =Sr.                    ReadLine (); if(TMP! =NULL&&tmp. Contains (key)) {flag= !Flag; }                    if(!flag &&!)iscontains (TMP, words)) streamwriter.writeline (TMP); if(count++%10000==0) Console.WriteLine (Count/10000); }} Console.WriteLine ("Total {0} rows of data", Count); }        /// <summary>        ///determine if the value in keys is included in the content/// </summary>        /// <param name= "Content" >Data Source</param>        /// <param name= "Keys" >Key List</param>        /// <returns></returns>         Public Static BOOLIscontains (stringContentstring[] keys) {            returnKeys! =NULL&&keys. Any (content.        Contains); }    }}

Delete a piece of data from a large log file