asp.net value passing summary

articles were collected from the Internet. I read that most of the contents are suitable for asp.net2.0
1. Open a new window and transfer parameters:
Transfer parameters:
response.write( "<script>window.open('*.aspx?id="+this.DropDownList1.SelectIndex+"&id1="++"')</script>")
Receive parameters:
string a = Request.QueryString["id"];
string b = Request.QueryString["id1"];

2. Add a dialog box for the button
Button1.Attributes.Add("onclick" ,"return confirm('confirm?')");
button.attributes.add("onclick","if(confirm('are you sure?')){return true;}else{return false;} ")

3. Delete selected records in the table
int intEmpID = (int)MyDataGrid.DataKeys[e.Item.ItemIndex];
string deleteCmd = "DELETE from Employee where emp_id = " + intEmpID.ToString()

4. Delete table record warning

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('Are you sure you want to delete this information');" );
break;
default:
break;
}

}

5. Click the table row to link to another page

private void grdCustomer_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
//Click the table to open
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 + "') ;");
}

Double-click the table to connect to another page, in the itemDataBind event
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 + "'");
}

Double-click the table to open a new page
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 + "')");
}

★Special note: [?id=] cannot be [?id =]
6.Table Hyperlink column passing parameters
NavigateUrl="aaa.aspx?id='<%# DataBinder.Eval( Container.DataItem, "Data Field 1")%>'
& name='<%# DataBinder.Eval(Container.DataItem, "Data Field 2")%>' />

7. Click on the table to change the color
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';");
}

Write in _ItemDataBound of DataGrid
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. About date format
Date format setting

DataformatString="{0:yyyy-MM-dd}"
I think it should be in the itembound event
e.items.cell["your column"].text =DateTime.Parse(e.items.cell["your column"].text.ToString("yyyy-MM-dd"))

9. Get the error message and go to the specified page
　Don't Use Response.Redirect instead of Server.Transfer
　e.g

// in global.asax
protected void Application_Error(Object sender, EventArgs e) {
if (Server.GetLastError( ) is HttpUnhandledException)
Server.Transfer("MyErrorPage.aspx");

//Leave the rest of the non-HttpUnhandledException exceptions to ASP.NET and it’s okay
}

Redirect will cause post-back to be generated and error information will be lost, so the page guidance should be executed directly on the server side, so that the error information can be obtained on the error handling page and processed accordingly

10. Clear Cookies

Cookie.Expires=[DateTime];
Response.Cookies("UserName").Expires = 0
11. Custom exception handling

//Custom exception handling class
using System;
using System.Diagnostics;

namespace MyAppException
{
/**////

/// Application exception handling class inherited from the system exception class ApplicationException.
/// Automatically record exception content to the application log of Windows NT/2000
///

public class AppException:System.ApplicationException
{
public AppException ()
{
if (ApplicationConfiguration.EventLogEnabled)
LogEvent("An unknown error occurred.");
}

public AppException(string message)
{
LogEvent(message);
}

public AppException(string message,Exception innerException)
{
LogEvent(message);
if (innerException != null)
{
LogEvent(innerException.Message);
}
}

//Logging class
using System;
using System.Configuration;
using System .Diagnostics;
using System.IO;
using System.Text;
using System.Threading;

namespace MyEventLog
{
/**//// /// Event logging class, providing event logging support
///
/// Defines 4 logging methods (error, warning, info, trace)
///
///
public class ApplicationLog
{
/**////

/// Record error information to Win2000/NT event log
/// Text information to be recorded ///

public static void WriteError(String message)
{

WriteLog(TraceLevel.Error, message);
}

/**////

/// Record warning information to the Win2000/NT event log
/// Text information to be recorded
/// < /summary>
public static void WriteWarning(String message)
{

WriteLog(TraceLevel.Warning, message);
}

/**////

/// Record the prompt information into the Win2000/NT event log
/// Text information to be recorded ///

public static void WriteInfo(String message)
{
WriteLog(TraceLevel.Info, message);
}
/** ////

/// Record tracking information to the Win2000/NT event log
/// Text information to be recorded ///

public static void WriteTrace(String message)
{

WriteLog(TraceLevel.Verbose, message);
}
/ **////

/// Format the text information format recorded to the event log
/// Exception object that needs to be formatted /// Exception information title string.
///
/// After format Exception information string, including exception content and trace stack.
///
///

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();
}

/**////

/// Actual event log writing method
/// The level of information to be recorded (error, warning,info,trace).
/// The text to be recorded.
///

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 );
//Write event log
eventLog.WriteEntry(messageText, LogEntryType );

}
catch {} //Ignore any exception
}
} //class ApplicationLog
}
12.Panel scrolls horizontally and automatically expands vertically



13. Enter to convert to Tab



onkeydown="if(event.keyCode==13) event.keyCode=9"

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

14.DataGrid super connection column

DataNavigateUrlField="Field name" DataNavigateUrlformatString="http://xx/inc/delete.aspx?ID={ 0}"

15.DataGrid rows change color with the mouse

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. Template column











< /ITEMTEMPLATE>





　Backend code

protected void CheckAll_CheckedChanged(object sender, System.EventArgs e)
{
//Change the selection of columns to select all or all Don't choose.
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. Number formatting

【<%# The result of Container.DataItem("price")%> is 500.0000. How to format it to 500.00?】
<%#Container.DataItem("price","{0:￥#,##0.00}" )%>
int i=123456;
string s=i.ToString("
,
.00");

18.Date formatting

[In the aspx page:<%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date")%>
Displayed as: 2004-8-11 19:44:28
I just want: 2004-8-11】

<%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date","{0:yyyy-M-d}")%>

How to change ?

【Format date】
Take it out, usually object
((DateTime)objectFromDB).ToString("yyyy-MM-dd");
###【Date Validation expression】###A. The following correct input format: [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. The following correct input format: [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 ]))$

【Case conversion】

HttpUtility.HtmlEncode(string);
HttpUtility.HtmlDecode(string)

19. How to set global variables

In Global.asax
In the Application_Start() event
Add Application[attribute name] = xxx;
It is your global variable

20. How to achieve HyperLinkColumn After the connection is generated, click Connect to open a new window?

HyperLinkColumn has an attribute Target, just set the value to "_blank". (Target="_blank")

【ASPNETMENU】Click the menu item to pop up a new window
In your Add URLTarget="_blank"
to the menu item of the menuData.xml file. For example:






URLTarget="_blank" LeftIcon="file.gif"/>


It is best to upgrade your aspnetmenu to version 1.2

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