string类与stringBuilder类的笔记

1,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

i2nx6y n02,stringBuilder类在性能我效率上比string类高效得多51Testing软件测试网MkM,nM k

3,使用stringBuilder类需引用system.Text命名空间

rYRdHt04,网页中对输入框进行的常用处理51Testing软件测试网` b$_)N7W/}9Q

 //替代某字符
v#` Q'Ybw0    private void tidai(TextBox tb2)
ZwW2Jg[0    {
4oJ`F5Vli&xe0        string str = tb2.Text;
l
Vc*B7|zv0        //string[] newstr =new string[100];
|3r4GVI6p0        string newwstr = str.Replace(" ", " ");51Testing软件测试网.ZN iy+BI
        string newstr = newwstr.ToUpper();//转换为大写,ToLower小写51Testing软件测试网Sa(jaMA1~*v.t
        TextBox1.Text = newstr.ToString();51Testing软件测试网(`&t ^E\ mF

    }

kh7r/G;?Ay0    //删除指定字符串
4X+y OU:~N0    private void Delete(TextBox tb2)
/x1B,M+T)Md0    {51Testing软件测试网2}Gz)mI5[`\?:Rkn
        string newstr = " ";
;_R@kI2he0        char[] trimchar ={ '\\', '@' };
&H&n5{j| [gum0        string ldstr = tb2.Text;
8}k~+Mj0        newstr = oldstr.Trim(trimchar);51Testing软件测试网6~%N K$~#^,yr
        TextBox1.Text = newstr.ToString();51Testing软件测试网6N[)F(M%K'H.p
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51Testing软件测试网SN?,T6\$m$sa_ L`]
    }
wI5r/\@$Cw0    //删除首尾空格
J [9y A!x1vi0    private void DeleteKong(TextBox tb2)51Testing软件测试网$y*j2TpZ0P&|4g$eX
    {
h-K$MdC)g7n0        string newstr = " ";
&h:~t!E;s
z"J0        char[] trimchar ={};51Testing软件测试网,M!J.T A5R&hI
        string ldstr = tb2.Text;51Testing软件测试网7zN`~T;g
        newstr = oldstr.Trim(trimchar);
t gJX*d Mk7}0        TextBox1.Text = newstr.ToString();51Testing软件测试网OO$Xz#X?;p*`m[`
    }51Testing软件测试网S#~[jWA

1f I!qu/OPqC-I0    //判断两个字符串是否相等
9E1Z'`@Z%O3a@0    private void Equal(TextBox tb1, TextBox tb2)51Testing软件测试网 yxh!bx
    {
&_5Junn0        if (string.Compare(tb1.Text, tb2.Text, true) == 0) //为true 不区分大小写
2QD-uP'_'oam0_ W0        {
0C\f0DVe0            Response.Write("OK");51Testing软件测试网zW,C)Tw7y4m5j.B!d
        }51Testing软件测试网)R^&@R
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        else51Testing软件测试网0Y8@ y(IJ*W }
        {51Testing软件测试网fG*gd#xU
            Response.Write("不相等");51Testing软件测试网,@~3Z,myt{(Z
        }
M$OND.Nu]0    }51Testing软件测试网"J5~#v'o5|S;Q
    //以指定的开始的字符串或结束字符串做为输入内容
0|m:EVa0`:ETB7h2C0    private void StaAndEnd( TextBox cc)51Testing软件测试网uL9K-|
H
    {
r7e,JYL7D9nJ0        string bb = cc.Text;51Testing软件测试网d4P)j OYb[6^S
        if (bb.StartsWith("qwen") && bb.EndsWith("haha"))
E+U-~eRv+tc_1q0        {51Testing软件测试网c?MVoi}3\%[@
            Response.Write("right  ");
0S!Gjo @0        }
.CTQcVEd_,P0        else51Testing软件测试网gR.B-XUM
        {
l G{q;J)q[X~1E$n9x/a0            Response.Write("error  ");51Testing软件测试网-CF z1Zb{c.cC
        }51Testing软件测试网3~*fFJg a#]
    }51Testing软件测试网3H{
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    //搜索指定字符在文本中出现的位置
UKC/BhvG0    private void Find(TextBox tb1)51Testing软件测试网 N)vU:t,uc
    {
bzX G2Ws0        string a = tb1.Text;51Testing软件测试网^ v$Jg){
        Response.Write(a.IndexOf("qwen"));51Testing软件测试网_:SfB.?_4\d;T
    }51Testing软件测试网9Go'{N5w[
    //拆分字符串51Testing软件测试网 c#Lor7c%h"n
    private void Oout(TextBox tb1)51Testing软件测试网(eB}AU d/MF
    {
y dro
pyaEr0        string newstr = tb1.Text;
:r.L9|)R2z$T~0        string[] sep = new string[] { "," };51Testing软件测试网O%b9A7L7X1D2y9w n
        string[] splitString = new string[100];51Testing软件测试网$Lz/U|O5M3l+Ei9Ob
        splitString = newstr.Split(sep,StringSplitOptions.None);51Testing软件测试网,r*n#v.l[Bd k]!O$V;l
        int i = 0;51Testing软件测试网qE|0H
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        while (i < splitString.Length)51Testing软件测试网g/T;](w!h
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        {
b8_N1~fw!WP0            //Response.Write(splitString[i].ToString());i++51Testing软件测试网f}&k#g-XE
        }51Testing软件测试网-Swbwo
    }