\u3000\u30001\u3001DateTime \u6570\u5b57\u578b <\/p>\n
System.DateTime currentTime=new System.DateTime();
\u3000\u30001.1 \u53d6\u5f53\u524d\u5e74\u6708\u65e5\u65f6\u5206\u79d2 <\/p>\n
currentTime=System.DateTime.Now;
\u3000\u30001.2 \u53d6\u5f53\u524d\u5e74 <\/p>\n
int \u5e74=currentTime.Year;
\u3000\u30001.3 \u53d6\u5f53\u524d\u6708 <\/p>\n
int \u6708=currentTime.Month;
\u3000\u30001.4 \u53d6\u5f53\u524d\u65e5 <\/p>\n
int \u65e5=currentTime.Day;
\u3000\u30001.5 \u53d6\u5f53\u524d\u65f6 <\/p>\n
int \u65f6=currentTime.Hour;
\u3000\u30001.6 \u53d6\u5f53\u524d\u5206 <\/p>\n
int \u5206=currentTime.Minute;
\u3000\u30001.7 \u53d6\u5f53\u524d\u79d2 <\/p>\n
int \u79d2=currentTime.Second;
\u3000\u30001.8 \u53d6\u5f53\u524d\u6beb\u79d2 <\/p>\n
int \u6beb\u79d2=currentTime.Millisecond;
\uff08\u53d8\u91cf\u53ef\u7528\u4e2d\u6587\uff09
\u3000\u30001.9 \u53d6\u4e2d\u6587\u65e5\u671f\u663e\u793a\u2014\u2014\u5e74\u6708\u65e5\u65f6\u5206 <\/p>\n
string strY=currentTime.ToString(“f”); \/\/\u4e0d\u663e\u793a\u79d2
\u3000\u30001.10 \u53d6\u4e2d\u6587\u65e5\u671f\u663e\u793a_\u5e74\u6708 <\/p>\n
string strYM=currentTime.ToString(“y”);
\u3000\u30001.11 \u53d6\u4e2d\u6587\u65e5\u671f\u663e\u793a_\u6708\u65e5 <\/p>\n
string strMD=currentTime.ToString(“m”);
\u3000\u30001.12 \u53d6\u5f53\u524d\u5e74\u6708\u65e5\uff0c\u683c\u5f0f\u4e3a\uff1a2003-9-23 <\/p>\n
string strYMD=currentTime.ToString(“d”);
\u3000\u30001.13 \u53d6\u5f53\u524d\u65f6\u5206\uff0c\u683c\u5f0f\u4e3a\uff1a14\uff1a24 <\/p>\n
string strT=currentTime.ToString(“t”);
\u3000\u30002\u3001\u5b57\u7b26\u578b\u8f6c\u6362 \u8f6c\u4e3a32\u4f4d\u6570\u5b57\u578b <\/p>\n
\u3000\u3000Int32.Parse(\u53d8\u91cf) Int32.Parse(“\u5e38\u91cf”) <\/p>\n
\u3000\u30003\u3001 \u53d8\u91cf.ToString() <\/p>\n
\u3000\u3000\u5b57\u7b26\u578b\u8f6c\u6362 \u8f6c\u4e3a\u5b57\u7b26\u4e32
\u3000\u300012345.ToString(“n”); \/\/\u751f\u6210 12,345.00
\u3000\u300012345.ToString(“C”); \/\/\u751f\u6210 \uffe512,345.00
\u3000\u300012345.ToString(“e”); \/\/\u751f\u6210 1.234500e+004
\u3000\u300012345.ToString(“f4”); \/\/\u751f\u6210 12345.0000
\u3000\u300012345.ToString(“x”); \/\/\u751f\u6210 3039 (16\u8fdb\u5236)
\u3000\u300012345.ToString(“p”); \/\/\u751f\u6210 1,234,500.00% <\/p>\n
\u3000\u30004\u3001\u53d8\u91cf.Length \u6570\u5b57\u578b <\/p>\n
\u3000\u3000\u53d6\u5b57\u4e32\u957f\u5ea6\uff1a <\/p>\n
\u3000\u3000\u5982\uff1a string str=”\u4e2d\u56fd”; <\/p>\n
int Len = str.Length ; \/\/Len\u662f\u81ea\u5b9a\u4e49\u53d8\u91cf\uff0c str\u662f\u6c42\u6d4b\u7684\u5b57\u4e32\u7684\u53d8\u91cf\u540d
\u3000\u30005\u3001\u5b57\u7801\u8f6c\u6362 \u8f6c\u4e3a\u6bd4\u7279\u7801 <\/p>\n
\u3000\u3000System.Text.Encoding.Default.GetBytes(\u53d8\u91cf) <\/p>\n
\u3000\u3000\u5982\uff1abyte[] bytStr = System.Text.Encoding.Default.GetBytes(str); <\/p>\n
\u3000\u3000\u7136\u540e\u53ef\u5f97\u5230\u6bd4\u7279\u957f\u5ea6\uff1a <\/p>\n
\u3000\u3000len = bytStr.Length; <\/p>\n
\u3000\u30006\u3001System.Text.StringBuilder(“”) <\/p>\n
\u3000\u3000\u5b57\u7b26\u4e32\u76f8\u52a0\uff0c\uff08+\u53f7\u662f\u4e0d\u662f\u4e5f\u4e00\u6837\uff1f\uff09 <\/p>\n
\u3000\u3000\u5982\uff1a <\/p>\n
System.Text.StringBuilder sb = new System.Text.StringBuilder(“”);
sb.Append(“\u4e2d\u534e”);
sb.Append(“\u4eba\u6c11”);
sb.Append(“\u5171\u548c\u56fd”);
\u3000\u30007\u3001\u53d8\u91cf.Substring(\u53c2\u65701,\u53c2\u65702); <\/p>\n
\u3000\u3000\u622a\u53d6\u5b57\u4e32\u7684\u4e00\u90e8\u5206\uff0c\u53c2\u65701\u4e3a\u5de6\u8d77\u59cb\u4f4d\u6570\uff0c\u53c2\u65702\u4e3a\u622a\u53d6\u51e0\u4f4d\u3002 <\/p>\n
\u3000\u3000\u5982\uff1astring s1 = str.Substring(0,2); <\/p>\n
\u3000\u30008\u3001\u53d6\u8fdc\u7a0b\u7528\u6237IP\u5730\u5740 <\/p>\n
String user_IP=Request.ServerVariables[“REMOTE_ADDR”].ToString();
\u3000\u30009\u3001\u7a7f\u8fc7\u4ee3\u7406\u670d\u52a1\u5668\u53d6\u8fdc\u7a0b\u7528\u6237\u771f\u5b9eIP\u5730\u5740\uff1a <\/p>\n
if(Request.ServerVariables[“HTTP_VIA”]!=null){
string user_IP=Request.ServerVariables[“HTTP_X_FORWARDED_FOR”].ToString();
}else{
string user_IP=Request.ServerVariables[“REMOTE_ADDR”].ToString();
}
\u3000\u300010\u3001\u5b58\u53d6Session\u503c <\/p>\n
Session[“\u53d8\u91cf”];
\u3000\u3000\u5982\uff0c\u8d4b\u503c\uff1a <\/p>\n
Session[“username”]=”\u5c0f\u5e03\u4ec0”;
\u3000\u3000\u53d6\u503c\uff1a <\/p>\n
Object objName=Session[“username”];
String strName=objName.ToString();
\u3000\u3000\u6e05\u7a7a\uff1a <\/p>\n
Session.RemoveAll();
\u3000\u300011\u3001\u7528\u8d85\u94fe\u63a5\u4f20\u9001\u53d8\u91cf <\/p>\n
String str=Request.QueryString[“\u53d8\u91cf”];
\u3000\u3000\u5982\u5728\u4efb\u4e00\u9875\u4e2d\u5efa\u8d85\u94fe\u63a5:<a href=Edit.aspx?fbid=23>\u70b9\u51fb<\/a> <\/p>\n
\u3000\u3000\u5728Edit.aspx\u9875\u4e2d\u53d6\u503c\uff1aString str=Request.QueryString[“fdid”]; <\/p>\n
\u3000\u300012\u3001\u521b\u5efaXML\u6587\u6863\u65b0\u8282\u70b9 <\/p>\n
\u3000\u3000DOC\u5bf9\u8c61.CreateElement(“\u65b0\u5efa\u8282\u70b9\u540d”); <\/p>\n
\u3000\u300013\u3001\u5c06\u65b0\u5efa\u7684\u5b50\u8282\u70b9\u52a0\u5230XML\u6587\u6863\u7236\u8282\u70b9\u4e0b <\/p>\n
\u3000\u3000\u7236\u8282\u70b9.AppendChild(\u5b50\u8282\u70b9)\uff1b <\/p>\n
\u3000\u300014\u3001 \u5220\u9664\u8282\u70b9 <\/p>\n
\u3000\u3000\u7236\u8282\u70b9.RemoveChild(\u8282\u70b9); <\/p>\n
\u3000\u300015\u3001\u5411\u9875\u9762\u8f93\u51fa\uff1aResponse <\/p>\n
Response.Write(“\u5b57\u4e32”)\uff1b
Response.Write(\u53d8\u91cf)\uff1b
\u3000\u3000\u8df3\u8f6c\u5230URL\u6307\u5b9a\u7684\u9875\u9762\uff1a <\/p>\n
Response.Redirect(“URL\u5730\u5740”\uff09\uff1b
\u3000\u300016\u3001\u67e5\u6307\u5b9a\u4f4d\u7f6e\u662f\u5426\u7a7a\u5b57\u7b26 <\/p>\n
char.IsWhiteSpce(\u5b57\u4e32\u53d8\u91cf\uff0c\u4f4d\u6570)\u2014\u2014\u903b\u8f91\u578b\uff1b \u3000\u3000
\u3000\u3000\u5982\uff1a <\/p>\n
string str=”\u4e2d\u56fd \u4eba\u6c11”;
Response.Write(char.IsWhiteSpace(str,2)); \/\/\u7ed3\u679c\u4e3a\uff1aTrue, \u7b2c\u4e00\u4e2a\u5b57\u7b26\u662f0\u4f4d\uff0c2\u662f\u7b2c\u4e09\u4e2a\u5b57\u7b26\u3002
\u3000\u300017\u3001\u67e5\u5b57\u7b26\u662f\u5426\u662f\u6807\u70b9\u7b26\u53f7 <\/p>\n
char.IsPunctuation(”\u5b57\u7b26”) –\u903b\u8f91\u578b
\u3000\u3000\u5982\uff1a <\/p>\n
Response.Write(char.IsPunctuation(”A”)); \/\/\u8fd4\u56de\uff1aFalse
\u3000\u300018\u3001\u628a\u5b57\u7b26\u8f6c\u4e3a\u6570\u5b57\uff0c\u67e5\u4ee3\u7801\u70b9\uff0c\u6ce8\u610f\u662f\u5355\u5f15\u53f7\u3002 <\/p>\n
\u3000\u3000(int)”\u5b57\u7b26” <\/p>\n
\u3000\u3000\u5982\uff1a <\/p>\n
Response.Write((int)”\u4e2d”); \/\/\u7ed3\u679c\u4e3a\u4e2d\u5b57\u7684\u4ee3\u7801\uff1a20013
\u3000\u300019\u3001\u628a\u6570\u5b57\u8f6c\u4e3a\u5b57\u7b26\uff0c\u67e5\u4ee3\u7801\u4ee3\u8868\u7684\u5b57\u7b26\uff1a(char)\u4ee3\u7801 <\/p>\n
\u3000\u3000\u5982\uff1a <\/p>\n
Response.Write((char)22269); \/\/\u8fd4\u56de\u201c\u56fd\u201d\u5b57\u3002
\u3000\u300020\u3001 \u6e05\u9664\u5b57\u4e32\u524d\u540e\u7a7a\u683c: Trim() <\/p>\n
\u3000\u300021\u3001\u5b57\u4e32\u66ff\u6362 <\/p>\n
\u3000\u3000\u5b57\u4e32\u53d8\u91cf.Replace(“\u5b50\u5b57\u4e32”,”\u66ff\u6362\u4e3a”) <\/p>\n
\u3000\u3000\u5982\uff1a <\/p>\n
string str=”\u4e2d\u56fd”;
str=str.Replace(“\u56fd”,”\u592e”); \/\/\u5c06\u56fd\u5b57\u6362\u4e3a\u592e\u5b57
Response.Write(str); \/\/\u8f93\u51fa\u7ed3\u679c\u4e3a\u201c\u4e2d\u592e\u201d
\u3000\u3000\u518d\u5982\uff1a\uff08\u8fd9\u4e2a\u975e\u5e38\u5b9e\u7528\uff09 <\/p>\n
string str=”\u8fd9\u662f<script>\u811a\u672c”;
str=str.Replace(“<“,”<font><<\/font>”); \/\/\u5c06\u5de6\u5c16\u62ec\u53f7\u66ff\u6362\u4e3a<font> \u4e0e < \u4e0e <\/font> \uff08\u6216\u6362\u4e3a<\uff0c\u4f46\u4f30\u8ba1\u7ecfXML\u5b58\u8bf8\u540e\uff0c\u518d\u63d0\u51fa\u4ecd\u4f1a\u8fd8\u539f\uff09
Response.Write(str); \/\/\u663e\u793a\u4e3a\uff1a\u201c\u8fd9\u662f<script>\u811a\u672c\u201d
\u3000\u3000\u5982\u679c\u4e0d\u66ff\u6362\uff0c<script>\u5c06\u4e0d\u663e\u793a\uff0c\u5982\u679c\u662f\u4e00\u6bb5\u811a\u672c\uff0c\u5c06\u8fd0\u884c\uff1b\u800c\u66ff\u6362\u540e\uff0c\u811a\u672c\u5c06\u4e0d\u8fd0\u884c\u3002 <\/p>\n
\u3000\u3000\u8fd9\u6bb5\u4ee3\u7801\u7684\u4ef7\u503c\u5728\u4e8e\uff1a\u4f60\u53ef\u4ee5\u8ba9\u4e00\u4e2a\u6587\u672c\u4e2d\u7684\u6240\u6709HTML\u6807\u7b7e\u5931\u6548\uff0c\u5168\u90e8\u663e\u793a\u51fa\u6765\uff0c\u4fdd\u62a4\u4f60\u7684\u5177\u6709\u4ea4\u4e92\u6027\u7684\u7ad9\u70b9\u3002 <\/p>\n
\u3000\u3000\u5177\u4f53\u5b9e\u73b0\uff1a\u5c06\u4f60\u7684\u8868\u5355\u63d0\u4ea4\u6309\u94ae\u811a\u672c\u52a0\u4e0a\u4e0b\u9762\u4ee3\u7801\uff1a <\/p>\n
string strSubmit=label1.Text; \/\/label1\u662f\u4f60\u8ba9\u7528\u6237\u63d0\u4ea4\u6570\u636e\u7684\u63a7\u4ef6ID\u3002
strSubmit=strSubmit.Replace(“<“,”<font><<\/font>”);
\u3000\u3000\u7136\u540e\u4fdd\u5b58\u6216\u8f93\u51fastrSubmit\u3002 <\/p>\n
\u3000\u3000\u7528\u6b64\u65b9\u6cd5\u8fd8\u53ef\u4ee5\u7b80\u5355\u5b9e\u73b0UBB\u4ee3\u7801\u3002 <\/p>\n
\u3000\u300022\u3001\u53d6i\u4e0ej\u4e2d\u7684\u6700\u5927\u503c\uff1aMath.Max(i,j) <\/p>\n
\u3000\u3000\u5982 int x=Math.Max(5,10); \/\/ x\u5c06\u53d6\u503c 10 <\/p>\n
\u3000\u3000\u52a0\u4e00\u70b9\u5427 23\u3001\u5b57\u4e32\u5bf9\u6bd4…… <\/p>\n
\u3000\u300023\u3001\u5b57\u4e32\u5bf9\u6bd4\u4e00\u822c\u90fd\u7528: if(str1==str2){ } , \u4f46\u8fd8\u6709\u522b\u7684\u65b9\u6cd5: <\/p>\n
\u3000\u3000(1)\u3001 <\/p>\n
string str1; str2
\/\/\u8bed\u6cd5: str1.EndsWith(str2); __\u68c0\u6d4b\u5b57\u4e32str1\u662f\u5426\u4ee5\u5b57\u4e32str2\u7ed3\u5c3e,\u8fd4\u56de\u5e03\u5c14\u503c.\u5982:
if(str1.EndsWith(str2)){ Response.Write(“\u5b57\u4e32str1\u662f\u4ee5”+str2+”\u7ed3\u675f\u7684”); }
\u3000\u3000(2)\u3001 <\/p>\n
\/\/\u8bed\u6cd5:str1.Equals(str2); __\u68c0\u6d4b\u5b57\u4e32str1\u662f\u5426\u4e0e\u5b57\u4e32str2\u76f8\u7b49,\u8fd4\u56de\u5e03\u5c14\u503c,\u7528\u6cd5\u540c\u4e0a.
\u3000\u3000(3)\u3001 <\/p>\n
\/\/\u8bed\u6cd5 Equals(str1,str2); __\u68c0\u6d4b\u5b57\u4e32str1\u662f\u5426\u4e0e\u5b57\u4e32str2\u76f8\u7b49,\u8fd4\u56de\u5e03\u5c14\u503c,\u7528\u6cd5\u540c\u4e0a.
\u3000\u300024\u3001\u67e5\u627e\u5b57\u4e32\u4e2d\u6307\u5b9a\u5b57\u7b26\u6216\u5b57\u4e32\u9996\u6b21\uff08\u6700\u540e\u4e00\u6b21\uff09\u51fa\u73b0\u7684\u4f4d\u7f6e,\u8fd4\u56de\u7d22\u5f15\u503c\uff1aIndexOf() \u3001LastIndexOf()\uff0c \u5982\uff1a <\/p>\n
str1.IndexOf(“\u5b57”)\uff1b \/\/\u67e5\u627e\u201c\u5b57\u201d\u5728str1\u4e2d\u7684\u7d22\u5f15\u503c\uff08\u4f4d\u7f6e\uff09
str1.IndexOf(“\u5b57\u4e32”)\uff1b\/\/\u67e5\u627e\u201c\u5b57\u4e32\u201d\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5728str1\u4e2d\u7684\u7d22\u5f15\u503c\uff08\u4f4d\u7f6e\uff09
str1.IndexOf(“\u5b57\u4e32”,3,2)\uff1b\/\/\u4ecestr1\u7b2c4\u4e2a\u5b57\u7b26\u8d77\uff0c\u67e5\u627e2\u4e2a\u5b57\u7b26\uff0c\u67e5\u627e\u201c\u5b57\u4e32\u201d\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5728str1\u4e2d\u7684\u7d22\u5f15\u503c\uff08\u4f4d\u7f6e\uff09
\u3000\u300025\u3001\u5728\u5b57\u4e32\u4e2d\u6307\u5b9a\u7d22\u5f15\u4f4d\u63d2\u5165\u6307\u5b9a\u5b57\u7b26\uff1aInsert() \uff0c\u5982\uff1a <\/p>\n
str1.Insert(1,”\u5b57”);\u5728str1\u7684\u7b2c\u4e8c\u4e2a\u5b57\u7b26\u5904\u63d2\u5165\u201c\u5b57\u201d\uff0c\u5982\u679cstr1=”\u4e2d\u56fd”\uff0c\u63d2\u5165\u540e\u4e3a\u201c\u4e2d\u5b57\u56fd\u201d\uff1b
\u3000\u300026\u3001\u5728\u5b57\u4e32\u5de6\uff08\u6216\u53f3\uff09\u52a0\u7a7a\u683c\u6216\u6307\u5b9achar\u5b57\u7b26\uff0c\u4f7f\u5b57\u4e32\u8fbe\u5230\u6307\u5b9a\u957f\u5ea6\uff1aPadLeft()\u3001PadRight() \uff0c\u5982\uff1a <\/p>\n
<%
string str1=”\u4e2d\u56fd\u4eba”;
str1=str1.PadLeft(10,”1”); \/\/\u65e0\u7b2c\u4e8c\u53c2\u6570\u4e3a\u52a0\u7a7a\u683c
Response.Write(str1); \/\/\u7ed3\u679c\u4e3a\u201c1111111\u4e2d\u56fd\u4eba\u201d \uff0c \u5b57\u4e32\u957f\u4e3a10
%>
\u3000\u300027\u3001\u4ece\u6307\u5b9a\u4f4d\u7f6e\u5f00\u59cb\u5220\u9664\u6307\u5b9a\u6570\u7684\u5b57\u7b26\uff1aRemove() <\/p>\n
\u3000\u300028.\u53cd\u8f6c\u6574\u4e2a\u4e00\u7ef4Array\u4e2d\u5143\u7d20\u7684\u987a\u5e8f\u3002 <\/p>\n
har[] charArray = “abcde”.ToCharArray();
Array.Reverse(charArray);
Console.WriteLine(new string(charArray));
\u3000\u300029.\u5224\u65ad\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u7684\u7b2cn\u4e2a\u5b57\u7b26\u662f\u5426\u662f\u5927\u5199 <\/p>\n
string str=”abcEEDddd”;
Response.Write(Char.IsUpper(str,3));<\/p>\n","protected":false},"excerpt":{"rendered":"
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