在asp.NET中字符串替换的五种方法
更新时间:2008年11月20日 14:22:14 作者:
asp.NET中字符串替换方法小结
测试
以下为引用的内容:
复制代码 代码如下:
staticvoidMain(string[]args)
{
stringsegment="AaBbCc";
stringsource;
stringpattern="AbC";
stringdestination="Some";
stringresult="";
constlongcount=1000;
StringBuilderpressure=newStringBuilder();
HiPerfTimertime;
for(inti=0;i<count;i++)
{
pressure.Append(segment);
}
source=pressure.ToString();
GC.Collect();
//regexp
time=newHiPerfTimer();
time.Start();
for(inti=0;i<count;i++)
{
result=Regex.Replace(source,pattern,
destination,RegexOptions.IgnoreCase);
}
time.Stop();
Console.WriteLine("regexp ="+time.Duration+"s");
GC.Collect();
//vb
time=newHiPerfTimer();
time.Start();
for(inti=0;i<count;i++)
{
result=Strings.Replace(source,pattern,
destination,1,-1,CompareMethod.Text);
}
time.Stop();
Console.WriteLine("vb ="+time.Duration+"s");
GC.Collect();
//vbReplace
time=newHiPerfTimer();
time.Start();
for(inti=0;i<count;i++)
{
result=VBString.Replace(source,pattern,
destination,1,-1,StringCompareMethod.Text);
}
time.Stop();
Console.WriteLine("vbReplace="+time.Duration+"s");//+result);
GC.Collect();
//ReplaceEx
time=newHiPerfTimer();
time.Start();
for(inti=0;i<count;i++)
{
result=Test.ReplaceEx(source,pattern,destination);
}
time.Stop();
Console.WriteLine("ReplaceEx="+time.Duration+"s");
GC.Collect();
//Replace
time=newHiPerfTimer();
time.Start();
for(inti=0;i<count;i++)
{
result=source.Replace(pattern.ToLower(),destination);
}
time.Stop();
Console.WriteLine("Replace ="+time.Duration+"s");
GC.Collect();
//sorry,twoslow:(
/*//substring
time=newHiPerfTimer();
time.Start();
for(inti=0;i<count;i++)
{
result=StringHelper.ReplaceText(source,pattern,
destination,StringHelper.CompareMethods.Text);
}
time.Stop();
Console.WriteLine("substring="+time.Duration+":");
GC.Collect();
//substringwithstringbuilder
time=newHiPerfTimer();
time.Start();
for(inti=0;i<count;i++)
{
result=StringHelper.ReplaceTextB(source,pattern,
destination,StringHelper.CompareMethods.Text);
}
time.Stop();
Console.WriteLine("substringB="+time.Duration+":");
GC.Collect();
*/
Console.ReadLine();
}
1?¢stringsegment="abcaBc";
regexp=3.75481827997692s
vb=1.52745502570857s
vbReplace=1.46234256029747s
ReplaceEx=0.797071415501132s!!!<FONTcolor=gray>Replace=0.178327413120941s</FONT>
//ReplaceEx>vbReplace>vb>regexp
2?¢stringsegment="abcaBcabC";
regexp=5.30117431126023s
vb=2.46258449048692s
vbReplace=2.5018721653171s
ReplaceEx=1.00662179131705s!!!
<FONTcolor=gray>Replace=0.233760994763301s</FONT>
//ReplaceEx>vb>vbReplace>regexp
3?¢stringsegment="abcaBcabCAbc";
regexp=7.00987862982586s
vb=3.61050301085753s
vbReplace=3.42324876485699s
ReplaceEx=1.14969947297771s!!!
<FONTcolor=gray>Replace=0.277254511397398s</FONT>
//ReplaceEx>vbReplace>vb>regexp
4?¢stringsegment="ABCabcAbCaBcAbcabCABCAbcaBC";
regexp=13.5940090151123s
vb=11.6806222578568s
vbReplace=11.1757614445411s
ReplaceEx=1.70264153684337s!!!(mygod!)
<FONTcolor=gray>Replace=0.42236820601501s</FONT>
//ReplaceEx>vbReplace>vb>regexp
查看程序的Block在:
以下为引用的内容:
复制代码 代码如下:
stringupperString=original.ToUpper();
stringupperPattern=pattern.ToUpper();
如果需要敏感,就免了这2行。
解释:先建一个char[]类型的变量采访替换后的字符,其大小就是最大可能被替换的字符,例如ABABAB,替换AB成C,其获取过程就是ABABAB最大可能包括的AB的数目乘以AB多于C的数目,
以下为引用的内容:
char[]chars=newchar[original.Length+Math.Max(0,inc)];
,inc不一定大于零。
然后循环,用IndexOf索引。赋值。。。判断,返回。
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