100 lines
4.7 KiB
HTML
100 lines
4.7 KiB
HTML
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<div id="sina_keyword_ad_area2" class="articalContent ">
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<div style="text-indent: 2em;">1.字符串比较<br />
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字符串.ComparTo(目标字符串)<br />
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"a".ComparTo("b");<br />
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2.查找子串<br />
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字符串.IndexOf(子串，查找其实位置) ;<br />
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字符串.LastIndexOf(子串) ;最后一次出现的位置<br />
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str.IndexOf("ab",0);<br />
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3.插入子串<br />
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字符串.Insert(插入位置，插入子串) ;<br />
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s.Insert(2,"ab");<br />
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4.移出子串<br />
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字符串.Remove（其实位置，移出数）;<br />
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s.Remove(3,2);<br />
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5.替换子串<br />
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字符串.Replace（源子串，替换为）;<br />
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s.Replace("-"," ");将-替换为空格<br />
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6.截取子串<br />
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字符串.Substring（截取其实位置，截取个数）;<br />
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"abcdef".Substring(2,3);结果为cde<br />
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7.去空格<br />
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myString = myString.Trim(); //同时删除字符串前后的空格<br />
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char[] trimChars = {' ','e','s'}; //准备删除的字符<br />
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myString = myString.Trim(trimChars); //删除所有指定字符<br />
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myString = myString.TrimEnd(); //删除字符串后的空格<br />
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myString = myString.TrimStart(); //删除字符串前的空格<br />
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8.转换大小写<br />
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str.ToLower()转化成小写字母<br />
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str.ToUpper()转化成大写字母<br />
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Char.IsUpper(str,3)//判断一个字符串中的第n个字符是否是大写<br />
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9.拆分字符串<br />
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string[] Strs = myString.Split(' ',3);
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//按照空格进行拆分，并且返回前三个字符串，结果在字符串数组里<br />
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10.使字串达到指定长度<br />
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PadLeft()、PadRight() ，如：<br />
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string str1="00";<br />
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str1=str1.PadLeft(3,'1'); //无第二参数为加空格，结果为“100”<br />
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11.得到字符串长度<br />
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len=str.Length;<br />
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12.字符串遍历<br />
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string myString = "This is a test!";<br />
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foreach (char myChar in myString)<br />
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{<br />
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Console.Write("{0}",myChar);<br />
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} </div>
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<div style="text-indent: 2em;">
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----------------------------------------------------------------------------------------</div>
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<div style="text-indent: 2em;">
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<h1>.net中几个经常用到的字符串的截取</h1>
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</div>
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<div style="text-indent: 2em;"><span style="line-height: 19px; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; font-size: 13px;">string str="123abc456";<br />
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int i=3;<br />
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1 取字符串的前i个字符<br />
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<span style="font-family: Verdana;"><span style="color: #008000; font-size: 13px;">str=str.Substring(0,i); //
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or str=str.Remove(i,str.Length-i); </span><br />
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2 去掉字符串的前i个字符：<br />
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<span style="color: #008000; font-size: 13px;">str=str.Remove(0,i);
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// or str=str.Substring(i); </span><br />
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3 从右边开始取i个字符：<br />
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</span><span style="font-family: Verdana;"><span style="color: #008000; font-size: 13px;">str=str.Substring(str.Length-i);
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// or str=str.Remove(0,str.Length-i);<br /></span>4
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从右边开始去掉i个字符：<br />
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<span style="color: #008000; font-size: 13px;">str=str.Substring(0,str.Length-i);
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// or str=str.Remove(str.Length-i,i);</span><br />
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5 判断字符串中是否有"abc" 有则去掉之<br />
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<span style="color: red; font-size: 13px;">using
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System.Text.RegularExpressions;</span><br /></span><span style="color: #008000; font-size: 13px;"><span style="font-family: Verdana;"> string
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str = "123abc456";<br />
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string
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a="abc";<br />
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Regex r =
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new Regex(a); <br />
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Match m =
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r.Match(str); <br />
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if
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(m.Success)<br />
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{<br />
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</span><span style="font-family: Verdana;"><span style="color: #0000ff; font-size: 13px;">//绿色部分与紫色部分取一种即可。<br />
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</span> str=str.Replace(a,"");<br />
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<span style="color: #008000; font-size: 13px;">Response.Write(str); </span><br />
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</span><span style="font-family: Verdana;"><span style="color: #ff00ff; font-size: 13px;">
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string str1,str2;<br />
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str1=str.Substring(0,m.Index);<br />
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str2=str.Substring(m.Index+a.Length,str.Length-a.Length-m.Index);</span><br />
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<span style="color: #ff00ff; font-size: 13px;">Response.Write(str1+str2); </span><br />
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}</span></span><br />
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6 如果字符串中有"abc"则替换成"ABC"<br />
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<span style="color: #008000; font-size: 13px;"><span style="font-family: Verdana;">str=str.Replace("abc","ABC");</span></span></span></div>
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</div>
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<p> </p>
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