string类与stringBuilder类的笔记

~e"ca;^e"\v~/G%`01,stringBuilder类是动态的,可在原对象上直接修改.而string类则是静态的,要修改就得开僻新的内存空间

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r8}qis02,stringBuilder类在性能我效率上比string类高效得多51Testing软件测试网Z|6DwLtl"n9h

d+J.V&K4Gt-~WW6p03,使用stringBuilder类需引用system.Text命名空间51Testing软件测试网N!YTP&m
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Y3gCQiq9O(Q8S0?pK04,网页中对输入框进行的常用处理51Testing软件测试网f(| F!`#Qps-` o;A@7l

:S,A(t#k+[(V7E1l3[ P.g0 //替代某字符51Testing软件测试网)h:_G3D` Q*m
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    private void tidai(TextBox tb2)51Testing软件测试网E[%qJ]`
    {
eS_:Pn9X$B0        string str = tb2.Text;
t2?*[-h:_+E4S7L0        //string[] newstr =new string[100];51Testing软件测试网os`d%f
        string newwstr = str.Replace(" ", " ");
,b[;Qv+B|?!^0        string newstr = newwstr.ToUpper();//转换为大写,ToLower小写
J-`cID$N0Pn0        TextBox1.Text = newstr.ToString();

    }51Testing软件测试网Y&~+JqZv|m0V9T

z-CaJMr
Rc0    //删除指定字符串
5M}%nA1I9l0    private void Delete(TextBox tb2)
T tum1o}!]E6T ?0    {51Testing软件测试网;Lq A5Ux;|A(L
        string newstr = " ";
0O'j7zJ1x^1D4@} I0        char[] trimchar ={ '\\', '@' };
ZY7cbiQ\@0        string ldstr = tb2.Text;51Testing软件测试网^/k,A5Bwp
        newstr = oldstr.Trim(trimchar);51Testing软件测试网3R:x"?2G1x ];h4L
        TextBox1.Text = newstr.ToString();

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B4a9YGgCq0    }
5?pe H{'?'Q$O+|B0    //删除首尾空格
;H6^%Dw;NCX0    private void DeleteKong(TextBox tb2)51Testing软件测试网Cs_vUY
    {
Gt K^7LV:F}0        string newstr = " ";51Testing软件测试网@L2|6N3m
        char[] trimchar ={};
Z#XKI0B0        string ldstr = tb2.Text;51Testing软件测试网2D#p(Z P5M5yQ[5_
        newstr = oldstr.Trim(trimchar);
{n$O(x:D4u'q1b0        TextBox1.Text = newstr.ToString();
+fscm)n0    }51Testing软件测试网C*P7k*q1OP5p

    //判断两个字符串是否相等
w,c7l u5`u%bm0    private void Equal(TextBox tb1, TextBox tb2)
t v GrS0    {
U4p*gAt"tVN0        if (string.Compare(tb1.Text, tb2.Text, true) == 0) //为true 不区分大小写51Testing软件测试网%gb/r(IfYu"?AFG
        {51Testing软件测试网
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            Response.Write("OK");
\K[6o ?:^A3[~0        }

I-x&n FFn,B+B0        else51Testing软件测试网{:g4~,W%z)c"M
        {
3AZY0X/S E t*@0K0            Response.Write("不相等");
rum:_2S3p0        }
&W.A'i2c:C0    }51Testing软件测试网L3e(Z;b:g,fj-~7k
    //以指定的开始的字符串或结束字符串做为输入内容
]$ppm/hky0    private void StaAndEnd( TextBox cc)51Testing软件测试网 ebS+H.{ JAPp~7~6Q }6q
    {51Testing软件测试网"GR8U[
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        string bb = cc.Text;
*i-x*]`!~-x1H9O0        if (bb.StartsWith("qwen") && bb.EndsWith("haha"))
CJ^4Z4U3Gk6t"S
G0        {51Testing软件测试网0@*v K2W P {c
            Response.Write("right  ");
1W^QX)WJ![0        }
}kBh#}C0        else51Testing软件测试网u{Q ZT9y1h)]
        {
l-o GdW(|.}*K2H0            Response.Write("error  ");51Testing软件测试网?W fa e h
        }
2_?`c~-NK7J0    }51Testing软件测试网:s's^&w-z

    //搜索指定字符在文本中出现的位置51Testing软件测试网t
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    private void Find(TextBox tb1)51Testing软件测试网!t?0{9j#{\/z)v
    {
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oqJ*G]0        string a = tb1.Text;51Testing软件测试网 V)u9Kz7w&i!V-?(Kg
        Response.Write(a.IndexOf("qwen"));51Testing软件测试网2\!zTz"i
u{A
    }51Testing软件测试网1w{8g-?8[,u
    //拆分字符串
'sT
R6~ v*P|:M4{0    private void Oout(TextBox tb1)
1uKRd-\IO0    {
5K{.\[f0H j*m0        string newstr = tb1.Text;51Testing软件测试网%J z9`OD*Wf,O
        string[] sep = new string[] { "," };
0@9\:BrSW VWJJ0        string[] splitString = new string[100];51Testing软件测试网1g)m?
oX;}.p*a
        splitString = newstr.Split(sep,StringSplitOptions.None);
g2{C0U~7e~p0        int i = 0;
6{-Bi*K&E0@?IG)}0        while (i < splitString.Length)
0r3@|0frLB N5t0        {
1| fq*|3?&?!L%GW;~;J#H0            //Response.Write(splitString[i].ToString());i++51Testing软件测试网!NdMOXL/l
        }51Testing软件测试网1Psqjj3j2U
    }