ASP.Net开发常见的一些问题总结
ASP.Net开发常见的一些问题总结
发布时间:2016-12-29 来源:查字典编辑
摘要:1.打开新的窗口并传送参数:传送参数:response.write("window.open('*.aspx?id="+this.DropD...

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;}")

3.删除表格选定记录

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='http://developer.51cto.com/art/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 + "')");

}

★特别注意:【?id=】 处不能为 【?id =】

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("rn");

}

strBuilder.Append(ex.Message).Append("rn").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></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"

http://dotnet.aspx.cc/exam/enter2tab.aspx

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");

18.日期格式化

【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....

}

22.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>

23.datagrid选定比较底下的行时,为什么总是刷新一下,然后就滚动到了最上面,刚才选定的行因屏幕的关系就看不到了

page_load

page.smartNavigation=true

24.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")

}

}

25.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);

}

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