Response.Write(Array.IndexOf(abc,"3",1));//在abc數(shù)組中查找"3",從abc[1]開始找
Response.Write(Array.LastIndexOf(abc,"3"));//在abc數(shù)組中查找"3",從最后開始找
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string[] arrStr=new string[8]{"1","4","3","2","16","14","12","14"};//arrStr[0]="1"...arrStr[7]="14"
Array.Reverse(arrStr); //顛倒arrStr數(shù)組，此時arrStr[0]="14"...arrStr[7]="1"
Array.Sort(arrStr); //給數(shù)組排序，此時順序為1,12,14,14,16,2,3,4（因為是按字符串排序）
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Array型數(shù)組要重定義大小,必須用ReDim(VB),對于大數(shù)組會特別慢;且無法在中間插入元素;不能清除它們(只能設(shè)置為空或0)
ArrayList在使用上比Array慢,但是不用重定義大小,使用myArrList.Add("Dog")s可以方便的添加數(shù)據(jù)
ArrayList myArrList = new ArrayList();//不用指出數(shù)組的大小,而且每個元素可以是任意數(shù)據(jù)類型;
myArrList.Insert(1,"abc"); //插入元素到數(shù)組[1]前
myArrList.RemoveAt(1); //刪除數(shù)組元素[1]
myArrList.Remove("abc"); //刪除內(nèi)容為"abc"的數(shù)組元素,只刪除一次,如果要全刪,需要做循環(huán)
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ListItem newItem=new ListItem();newItem.Text="a";newItem.Value="b";
myDropDown.Items.Add(newItem);//使用ListItem為List框添加項
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Hashtable ht =new Hashtable();ht["1"]="a";ht.Add("2","a");//Hashtable用法
SortedList sl=new SortedList();sl["1"]="a";sl.Add("2","a");//SortedList用法,會自動根據(jù)key進(jìn)行排序
foreach(DictionaryEntry abc in sl) //遍歷SortedList的辦法
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ConnStr=@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\abc.mdb";//連接ACCESS數(shù)據(jù)庫,注意加了個@
ConnStr="Server=127.0.0.1;DataBase=MyDataBase;uid=username;pwd=password";//連接SQL Server數(shù)據(jù)庫
ConnStr="Provider=SQLOLEDB.1;Server=127.0.0.1;DataBase=MyDataBase;Initial Catalog=MyCatalog;uid=username;pwd=password";//用OLEDB連接SQL Server數(shù)據(jù)庫
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ConnStr=@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\abc.mdb";//連接ACCESS數(shù)據(jù)庫,注意加了個@
OleDbConnection con=new OleDbConnection(connstr);con.Open();con.Close();
或
OleDbConnection con=new OleDbConnection();
con.ConnectionString=ConnStr;con.Open();con.Close();
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OleDbConnection con=new OleDbConnection(connstr);
OleDbCommand dc=new OleDbCommand("select * from employees",con);
OleDbDataReader dr=null;con.Open();dr=dc.ExecuteReader();
while(dr.Read()==true)Response.Write(dr["FirstName"]+"<BR>");
dr.Close();con.Close();//DataReader和Connection要關(guān)閉,Command不用
//這里不用 dr=null, .Net會自動完成,不過加上dr=null會較快的釋放內(nèi)存
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<input type=text id="txtHtml" runat=server />
與
<asp:textbox id="txtAsp" runat=server />
的區(qū)別：
1.txtAsp使用OnClick，而txtHtml使用 OnServerClick
2.txtAsp使用Text來設(shè)置和獲取值，而txtHtml使用txtHtml.Value來設(shè)置和獲取值
3.<span id="sum" runat=server /> 使用InnerText屬性來寫入。
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控件：
<asp:listbox id="mylist" runat=server rows=6 selectionMode="Multiple">
<asp:ListItem Text="a" Selected="true" runat=server />
</asp:listbox>
ArrayList a = new ArrayList();for(int i=0;i<mylist.Items.Count;i++){if(mylist.Items[i].Selected)a.Add(i);}
<asp:DropDownList id="myddlist" runat=server>沒有 rows和selectionMode 屬性
<asp:CheckBoxList id="cblist" Runat=Server CellPadding=0 CellSpacing=0
RepeatColumns=3 RepeatDirection="Horizontal"或"Vertical">
<asp:ListItem Text="a" Selected="true" runat=server />
</asp:CheckBoxList>
<asp:RadioButtonList id="rblist" Runat=Server CellPadding=0 CellSpacing=0
RepeatColumns=3 RepeatDirection="Horizontal"或"Vertical">
list.SelectedItem.Text;list.SelectedIndex;list.Items[i].Selected;
list.Items.Insert( 0 , new ListItem ("全部" , "-1")) ;
把詳細(xì)信息add進(jìn)去之后,最后執(zhí)行下面兩句
select_info.Items.Add("choose one department");
select_info.SelectedIndex=select_kc.Items.Count-1;