ASP.NET程序中常用的三十三种代码
1. 打开新的窗口并传送参数:
传送参数:
response.write("<script>window.open(’*.aspx?id="+this.DropDownList1.SelectIndex+"&id1="+...+"’)</script>") |
接收参数:
string a = Request.QueryString("id"); string b = Request.QueryString("id1"); |
2.为按钮添加对话框
Button1.Attributes.Add("onclick","return confirm(’确认?’)"); button.attributes.add("onclick","if(confirm(’are you sure...?’)){return true;}else{return false;}") |
int intEmpID = (int)MyDataGrid.DataKeys[e.Item.ItemIndex]; string deleteCmd = "DELETE from Employee where emp_id = " + intEmpID.ToString() |
4.删除表格记录警告
private void DataGrid_ItemCreated(Object sender,DataGridItemEventArgs e) { switch(e.Item.ItemType) { case ListItemType.Item : case ListItemType.AlternatingItem : case ListItemType.EditItem: TableCell myTableCell; myTableCell = e.Item.Cells[14]; LinkButton myDeleteButton ; myDeleteButton = (LinkButton)myTableCell.Controls[0]; myDeleteButton.Attributes.Add("onclick","return confirm(’您是否确定要删除这条信息’);"); break; default: break; } } |
5.点击表格行链接另一页
private void grdCustomer_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) { //点击表格打开 if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) e.Item.Attributes.Add("onclick","window.open(’Default.aspx?id=" + e.Item.Cells[0].Text + "’);"); } |
双击表格连接到另一页
在itemDataBind事件中
if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) { string OrderItemID =e.item.cells[1].Text; ... e.item.Attributes.Add("ondblclick", "location.href=’../ShippedGrid.aspx?id=" + OrderItemID + "’"); } |
双击表格打开新一页
if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) { string OrderItemID =e.item.cells[1].Text; ... e.item.Attributes.Add("ondblclick", "open(’../ShippedGrid.aspx?id=" + OrderItemID + "’)"); } |
6.表格超连接列传递参数
<asp:HyperLinkColumn Target="_blank" headertext="ID号" DataTextField="id" NavigateUrl="aaa.aspx?id=’ <%# DataBinder.Eval(Container.DataItem, "数据字段1")%>’ & name=’<%# DataBinder.Eval(Container.DataItem, "数据字段2")%>’ /> |
7.表格点击改变颜色
if (e.Item.ItemType == ListItemType.Item ||e.Item.ItemType == ListItemType.AlternatingItem) { e.Item.Attributes.Add("onclick","this.style.backgroundColor=’#99cc00’; this.style.color=’buttontext’;this.style.cursor=’default’;"); } |
写在DataGrid的_ItemDataBound里
if (e.Item.ItemType == ListItemType.Item ||e.Item.ItemType == ListItemType.AlternatingItem) { e.Item.Attributes.Add("onmouseover","this.style.backgroundColor=’#99cc00’; this.style.color=’buttontext’;this.style.cursor=’default’;"); e.Item.Attributes.Add("onmouseout","this.style.backgroundColor=’’;this.style.color=’’;"); } |
8.关于日期格式
日期格式设定
DataFormatString="{0:yyyy-MM-dd}" |
我觉得应该在itembound事件中
e.items.cell["你的列"].text=DateTime.Parse(e.items.cell["你的列"].text.ToString("yyyy-MM-dd")) |
9.获取错误信息并到指定页面
不要使用Response.Redirect,而应该使用Server.Transfer
e.g
// in global.asax protected void Application_Error(Object sender, EventArgs e) { if (Server.GetLastError() is HttpUnhandledException) Server.Transfer("MyErrorPage.aspx"); //其余的非HttpUnhandledException异常交给ASP.NET自己处理就okay了 :) } |
Redirect会导致post-back的产生从而丢失了错误信息,所以页面导向应该直接在服务器端执行,这样就可以在错误处理页面得到出错信息并进行相应的处理
10.清空Cookie
Cookie.Expires=[DateTime]; Response.Cookies("UserName").Expires = 0 |
11.自定义异常处理
//自定义异常处理类 using System; using System.Diagnostics; namespace MyAppException { /// <summary> /// 从系统异常类ApplicationException继承的应用程序异常处理类。 /// 自动将异常内容记录到Windows NT/2000的应用程序日志 /// </summary> public class AppException:System.ApplicationException { public AppException() { if (ApplicationConfiguration.EventLogEnabled)LogEvent("出现一个未知错误。"); } public AppException(string message) { LogEvent(message); } public AppException(string message,Exception innerException) { LogEvent(message); if (innerException != null) { LogEvent(innerException.Message); } } //日志记录类 using System; using System.Configuration; using System.Diagnostics; using System.IO; using System.Text; using System.Threading; namespace MyEventLog { /// <summary> /// 事件日志记录类,提供事件日志记录支持 /// <remarks> /// 定义了4个日志记录方法 (error, warning, info, trace) /// </remarks> /// </summary> public class ApplicationLog { /// <summary> /// 将错误信息记录到Win2000/NT事件日志中 /// <param name="message">需要记录的文本信息</param> /// </summary> public static void WriteError(String message) { WriteLog(TraceLevel.Error, message); } /// <summary> /// 将警告信息记录到Win2000/NT事件日志中 /// <param name="message">需要记录的文本信息</param> /// </summary> public static void WriteWarning(String message) { WriteLog(TraceLevel.Warning, message); } /// <summary> /// 将提示信息记录到Win2000/NT事件日志中 /// <param name="message">需要记录的文本信息</param> /// </summary> public static void WriteInfo(String message) { WriteLog(TraceLevel.Info, message); } /// <summary> /// 将跟踪信息记录到Win2000/NT事件日志中 /// <param name="message">需要记录的文本信息</param> /// </summary> public static void WriteTrace(String message) { WriteLog(TraceLevel.Verbose, message); } /// <summary> /// 格式化记录到事件日志的文本信息格式 /// <param name="ex">需要格式化的异常对象</param> /// <param name="catchInfo">异常信息标题字符串.</param> /// <retvalue> /// <para>格式后的异常信息字符串,包括异常内容和跟踪堆栈.</para> /// </retvalue> /// </summary> public static String FormatException(Exception ex, String catchInfo) { StringBuilder strBuilder = new StringBuilder(); if (catchInfo != String.Empty) { strBuilder.Append(catchInfo).Append("\r\n"); } strBuilder.Append(ex.Message).Append("\r\n").Append(ex.StackTrace); return strBuilder.ToString(); } /// <summary> /// 实际事件日志写入方法 /// <param name="level">要记录信息的级别(error,warning,info,trace).</param> /// <param name="messageText">要记录的文本.</param> /// </summary> private static void WriteLog(TraceLevel level, String messageText) { try { EventLogEntryType LogEntryType; switch (level) { case TraceLevel.Error: LogEntryType = EventLogEntryType.Error; break; case TraceLevel.Warning: LogEntryType = EventLogEntryType.Warning; break; case TraceLevel.Info: LogEntryType = EventLogEntryType.Information; break; case TraceLevel.Verbose: LogEntryType = EventLogEntryType.SuccessAudit; break; default: LogEntryType = EventLogEntryType.SuccessAudit; break; } EventLog eventLog = new EventLog("Application", ApplicationConfiguration.EventLogMachineName, ApplicationConfiguration.EventLogSourceName ); //写入事件日志 eventLog.WriteEntry(messageText, LogEntryType); } catch {} //忽略任何异常 } } //class ApplicationLog } |
12.Panel 横向滚动,纵向自动扩展
<asp:panel style="overflow-x:scroll;overflow-y:auto;"></asp:panel> |
13.回车转换成Tab
<script language="javascript" for="document" event="onkeydown"> if(event.keyCode==13 && event.srcElement.type!=’button’ && event.srcElement.type!=’submit’ && event.srcElement.type!=’reset’ && event.srcElement.type!=’’&& event.srcElement.type!=’textarea’); event.keyCode=9; </script> onkeydown="if(event.keyCode==13) event.keyCode=9" |
14.DataGrid超级连接列
DataNavigateUrlField="字段名" DataNavigateUrlFormatString="http://xx/inc/delete.aspx?ID={0}" |
15.DataGrid行随鼠标变色
private void DGzf_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) { if (e.Item.ItemType!=ListItemType.Header) { e.Item.Attributes.Add( "onmouseout","this.style.backgroundColor=\""+e.Item.Style["BACKGROUND-COLOR"]+"\""); e.Item.Attributes.Add( "onmouseover","this.style.backgroundColor=\""+ "#EFF3F7"+"\""); } } |
16.模板列
<ASP:TEMPLATECOLUMN visible="False" sortexpression="demo" headertext="ID"> <ITEMTEMPLATE> <ASP:LABEL text=’<%# DataBinder.Eval(Container.DataItem, "ArticleID")%>’ runat="server" width="80%" id="lblColumn" /> </ITEMTEMPLATE> </ASP:TEMPLATECOLUMN> <ASP:TEMPLATECOLUMN headertext="选中"> <HEADERSTYLE wrap="False" horizontalalign="Center"></HEADERSTYLE> <ITEMTEMPLATE> <ASP:CHECKBOX id="chkExport" runat="server" /> </ITEMTEMPLATE> <EDITITEMTEMPLATE> <ASP:CHECKBOX id="chkExportON" runat="server" enabled="true" /> </EDITITEMTEMPLATE> </ASP:TEMPLATECOLUMN> |
后台代码
protected void CheckAll_CheckedChanged(object sender, System.EventArgs e) { //改变列的选定,实现全选或全不选。 CheckBox chkExport ; if( CheckAll.Checked) { foreach(DataGridItem oDataGridItem in MyDataGrid.Items) { chkExport = (CheckBox)oDataGridItem.FindControl("chkExport"); chkExport.Checked = true; } } else { foreach(DataGridItem oDataGridItem in MyDataGrid.Items) { chkExport = (CheckBox)oDataGridItem.FindControl("chkExport"); chkExport.Checked = false; } } } |
17.数字格式化
【<%#Container.DataItem("price")%>的结果是500.0000,怎样格式化为500.00?】
<%#Container.DataItem("price","{0:¥#,##0.00}")%> int i=123456; string s=i.ToString("###,###.00"); |
【aspx页面内:<%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date")%>
显示为: 2004-8-11 19:44:28
我只想要:2004-8-11 】
<%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date","{0:yyyy-M-d}")%> |
应该如何改?
【格式化日期】
取出来,一般是object((DateTime)objectFromDB).ToString("yyyy-MM-dd");
【日期的验证表达式】
A.以下正确的输入格式: [2004-2-29], [2004-02-29 10:29:39 pm], [2004/12/31]
^((\d{2}(([02468][048])|([13579][26]))[\-\/\s]?((((0?[13578])|(1[02]))[\-\/\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\-\/\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\-\/\s]?((0?[1-9])|([1-2][0-9])))))|(\d{2}(([02468][1235679])|([13579][01345789]))[\-\/\s]?((((0?[13578])|(1[02]))[\-\/\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\-\/\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\-\/\s]?((0?[1-9])|(1[0-9])|(2[0-8]))))))(\s(((0?[1-9])|(1[0-2]))\:([0-5][0-9])((\s)|(\:([0-5][0-9])\s))([AM|PM|am|pm]{2,2})))?$ |
B.以下正确的输入格式:[0001-12-31], [9999 09 30], [2002/03/03]
^\d{4}[\-\/\s]?((((0[13578])|(1[02]))[\-\/\s]?(([0-2][0-9])|(3[01])))|(((0[469])|(11))[\-\/\s]?(([0-2][0-9])|(30)))|(02[\-\/\s]?[0-2][0-9]))$ |
【大小写转换】
HttpUtility.HtmlEncode(string); HttpUtility.HtmlDecode(string) |
19.如何设定全局变量
Global.asax中
Application_Start()事件中
添加Application[属性名] = xxx;
就是你的全局变量
20.怎样作到HyperLinkColumn生成的连接后,点击连接,打开新窗口?
HyperLinkColumn有个属性Target,将器值设置成"_blank"即可.(Target="_blank")
【ASPNETMENU】点击菜单项弹出新窗口
在你的menuData.xml文件的菜单项中加入URLTarget="_blank",如:
<?xml version="1.0" encoding="GB2312"?> <MenuData ImagesBaseURL="images/"> <MenuGroup> <MenuItem Label="内参信息" URL="Infomation.aspx" > <MenuGroup ID="BBC"> <MenuItem Label="公告信息" URL="Infomation.aspx" URLTarget="_blank" LeftIcon="file.gif"/> <MenuItem Label="编制信息简报" URL="NewInfo.aspx" LeftIcon="file.gif" /> ...... |
最好将你的aspnetmenu升级到1.2版
21.读取DataGrid控件TextBox值
foreach(DataGrid dgi in yourDataGrid.Items) { TextBox tb = (TextBox)dgi.FindControl("yourTextBoxId"); tb.Text.... } |
23.在DataGrid中有3个模板列包含Textbox分别为 DG_ShuLiang (数量) DG_DanJian(单价) DG_JinE(金额)分别在5.6.7列,要求在录入数量及单价的时候自动算出金额即:数量*单价=金额还要求录入时限制为 数值型.我如何用客户端脚本实现这个功能?
〖思归〗
<asp:TemplateColumn HeaderText="数量"> <ItemTemplate> <asp:TextBox id="ShuLiang" runat=’server’ Text=’<%# DataBinder.Eval(Container.DataItem,"DG_ShuLiang")%>’ onkeyup="javascript:DoCal()" /> <asp:RegularExpressionValidator id="revS" runat="server" ControlToValidate="ShuLiang" ErrorMessage="must be integer" ValidationExpression="^\d+$" /> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="单价"> <ItemTemplate> <asp:TextBox id="DanJian" runat=’server’ Text=’<%# DataBinder.Eval(Container.DataItem,"DG_DanJian")%>’ onkeyup="javascript:DoCal()" /> <asp:RegularExpressionValidator id="revS2" runat="server" ControlToValidate="DanJian" ErrorMessage="must be numeric" ValidationExpression="^\d+(\.\d*)?$" /> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="金额"> <ItemTemplate> <asp:TextBox id="JinE" runat=’server’ Text=’<%# DataBinder.Eval(Container.DataItem,"DG_JinE")%>’ /> </ItemTemplate> </asp:TemplateColumn><script language="javascript"> function DoCal() { var e = event.srcElement; var row = e.parentNode.parentNode; var txts = row.all.tags("INPUT"); if (!txts.length || txts.length < 3) return; var q = txts[txts.length-3].value; var p = txts[txts.length-2].value; if (isNaN(q) || isNaN(p)) return; q = parseInt(q); p = parseFloat(p); txts[txts.length-1].value = (q * p).toFixed(2); } </script> |
page_load page.smartNavigation=true |
25.在Datagrid中修改数据,当点击编辑键时,数据出现在文本框中,怎么控制文本框的大小 ?
private void DataGrid1_ItemDataBound(obj sender,DataGridItemEventArgs e) { for(int i=0;i<e.Item.Cells.Count-1;i++) if(e.Item.ItemType==ListItemType.EditType) { e.Item.Cells[i].Attributes.Add("Width", "80px") } } |
26.对话框
private static string ScriptBegin = "<script language=\"JavaScript\">"; private static string ScriptEnd = "</script>"; public static void ConfirmMessageBox(string PageTarget,string Content) { string ConfirmContent="var retValue=window.confirm(’"+Content+"’);"+"if(retValue){window.location=’"+PageTarget+"’;}"; ConfirmContent=ScriptBegin + ConfirmContent + ScriptEnd; Page ParameterPage = (Page)System.Web.HttpContext.Current.Handler; ParameterPage.RegisterStartupScript("confirm",ConfirmContent); //Response.Write(strScript); } |
27. 将时间格式化:string aa=DateTime.Now.ToString("yyyy年MM月dd日");
1.1 取当前年月日时分秒
currentTime=System.DateTime.Now; |
1.2 取当前年
int 年= DateTime.Now.Year; |
1.3 取当前月
int 月= DateTime.Now.Month; |
1.4 取当前日
int 日= DateTime.Now.Day; |
1.5 取当前时
int 时= DateTime.Now.Hour; |
1.6 取当前分
int 分= DateTime.Now.Minute; |
1.7 取当前秒
int 秒= DateTime.Now.Second; |
1.8 取当前毫秒
int 毫秒= DateTime.Now.Millisecond; |
28.自定义分页代码:
先定义变量 :
public static int pageCount; //总页面数 public static int curPageIndex=1; //当前页面 |
下一页:
if(DataGrid1.CurrentPageIndex < (DataGrid1.PageCount - 1)) { DataGrid1.CurrentPageIndex += 1; curPageIndex+=1; } bind(); // DataGrid1数据绑定函数 |
上一页:
if(DataGrid1.CurrentPageIndex >0) { DataGrid1.CurrentPageIndex += 1; curPageIndex-=1; } bind(); // DataGrid1数据绑定函数 |
直接页面跳转:
int a=int.Parse(JumpPage.Value.Trim());//JumpPage.Value.Trim()为跳转值 if(a<DataGrid1.PageCount) { this.DataGrid1.CurrentPageIndex=a; } bind(); |
29.DataGrid使用:
添加删除确认:
private void DataGrid1_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) { foreach(DataGridItem di in this.DataGrid1.Items) { if(di.ItemType==ListItemType.Item||di.ItemType==ListItemType.AlternatingItem) { ((LinkButton)di.Cells[8].Controls[0]).Attributes.Add("onclick","return confirm(’确认删除此项吗?’);"); } } } |
样式交替:
ListItemType itemType = e.Item.ItemType; if (itemType == ListItemType.Item ) { e.Item.Attributes["onmouseout"] = "javascript:this.style.backgroundColor=’#FFFFFF’;"; e.Item.Attributes["onmouseover"] = "javascript:this.style.backgroundColor=’#d9ece1’;cursor=’hand’;" ; } else if( itemType == ListItemType.AlternatingItem) { e.Item.Attributes["onmouseout"] = "javascript:this.style.backgroundColor=’#a0d7c4’;"; e.Item.Attributes["onmouseover"] = "javascript:this.style.backgroundColor=’#d9ece1’;cursor=’hand’;" ; } |
添加一个编号列:
DataTable dt= c.ExecuteRtnTableForAccess(sqltxt); //执行sql返回的DataTable DataColumn dc=dt.Columns.Add("number",System.Type.GetType("System.String")); for(int i=0;i<dt.Rows.Count;i++) { dt.Rows[i]["number"]=(i+1).ToString(); } DataGrid1.DataSource=dt; DataGrid1.DataBind(); |
DataGrid1中添加一个CheckBox,页面中添加一个全选框
private void CheckBox2_CheckedChanged(object sender, System.EventArgs e) { foreach(DataGridItem thisitem in DataGrid1.Items) { ((CheckBox)thisitem.Cells[0].Controls[1]).Checked=CheckBox2.Checked; } } |
将当前页面中DataGrid1显示的数据全部删除
foreach(DataGridItem thisitem in DataGrid1.Items) { if(((CheckBox)thisitem.Cells[0].Controls[1]).Checked) { string strloginid= DataGrid1.DataKeys[thisitem.ItemIndex].ToString(); Del (strloginid); //删除函数 } } |
30.当文件在不同目录下,需要获取数据库连接字符串(如果连接字符串放在Web.config,然后在Global.asax中初始化)
在Application_Start中添加以下代码:
Application["ConnStr"]=this.Context.Request.PhysicalApplicationPath+ConfigurationSettings. AppSettings["ConnStr"].ToString(); |
31. 变量.ToString()
字符型转换 转为字符串
12345.ToString("n"); //生成 12,345.00 12345.ToString("C"); //生成 ¥12,345.00 12345.ToString("e"); //生成 1.234500e+004 12345.ToString("f4"); //生成 12345.0000 12345.ToString("x"); //生成 3039 (16进制) 12345.ToString("p"); //生成 1,234,500.00% |
32、变量.Substring(参数1,参数2);
截取字串的一部分,参数1为左起始位数,参数2为截取几位。 如:string s1 = str.Substring(0,2);
33.在自己的网站上登陆其他网站:(如果你的页面是通过嵌套方式的话,因为一个页面只能有一个FORM,这时可以导向另外一个页面再提交登陆信息)
<SCRIPT language="javascript"> <!-- function gook(pws) { frm.submit(); } //--> </SCRIPT> <body leftMargin="0" topMargin="0" onload="javascript:gook()" marginwidth="0" marginheight="0"> <form name="frm" action=" http://220.194.55.68:6080/login.php?retid=7259 " method="post"> <tr> <td> <input id="f_user" type="hidden" size="1" name="f_user" runat="server"> <input id="f_domain" type="hidden" size="1" name="f_domain" runat="server"> <input class="box" id="f_pass" type="hidden" size="1" name="pwshow" runat="server"> <INPUT id="lng" type="hidden" maxLength="20" size="1" value="5" name="lng"> <INPUT id="tem" type="hidden" size="1" value="2" name="tem"> </td> </tr> </form> |
文本框的名称必须是你要登陆的网页上的名称,如果源码不行可以用vsniffer 看看。
下面是获取用户输入的登陆信息的代码:
string name; name=Request.QueryString["EmailName"]; try { int a=name.IndexOf("@",0,name.Length); f_user.Value=name.Substring(0,a); f_domain.Value=name.Substring(a+1,name.Length-(a+1)); f_pass.Value=Request.QueryString["Psw"]; } catch { Script.Alert("错误的邮箱!"); Server.Transfer("index.aspx"); } |