Common codes in ASP. NET (Article 2)

11. Custom Exception Handling

// Custom exception handling class
Using system;
Using system. diagnostics;

Namespace myappexception
{
/// <Summary>
///
Applications inherited from system exception applicationexceptionProgramException Handling class.
/// Automatically record the exception content to the application logs of Windows NT/2000

/// </Summary>
Public class appexception: system. applicationexception

{
Public appexception ()
{
If
(Applicationconfiguration. eventlogenabled) logevent ("an unknown error occurs. ");
}

Public appexception (string message)
{
Logevent (Message );
}

Public appexception (string message, exception innerexception)
{

Logevent (Message );
If (innerexception! = NULL)
{

Logevent (innerexception. Message );
}
}

// Log record type
Using system;
Using system. configuration;
Using
System. diagnostics;
Using system. IO;
Using system. text;
Using
System. Threading;

Namespace myeventlog
{
/// <Summary>
/// Event logging class, supporting event logging

/// <Remarks>
/// Defines four logging methods (error, warning, info, trace)
///
</Remarks>
/// </Summary>
Public class applicationlog
{
///
<Summary>
/// Record the error information to the Win2000/NT Event Log
/// <Param
Name = "message"> text information to be recorded </param>
/// </Summary>
Public static void
Writeerror (string message)
{
Writelog (tracelevel. error, message );

}

/// <Summary>
/// Record the warning information to the Win2000/NT Event Log
/// <Param
Name = "message"> text information to be recorded </param>
/// </Summary>
Public static void
Writewarning (string message)
{
Writelog (tracelevel. Warning, message );

}

/// <Summary>
/// Record the prompt information to the Win2000/NT Event Log
/// <Param
Name = "message"> text information to be recorded </param>
/// </Summary>
Public static void
Writeinfo (string message)
{
Writelog (tracelevel. info, message );
}

/// <Summary>
/// Record tracking information to Win2000/NT Event Logs
/// <Param
Name = "message"> text information to be recorded </param>
/// </Summary>
Public static void
Writetrace (string message)
{
Writelog (tracelevel. verbose, message );

}

/// <Summary>
/// Format the text information recorded in the event log
/// <Param
Name = "ex"> the exception object to be formatted </param>
/// <Param name = "catchinfo"> exception message title string. </param>

/// <Retvalue>
/// <Para> formatted exception information string, including the exception content and trace stack. </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>
/// Actual event log Writing Method
/// <Param
Name = "level"> level (error, warning, info, trace) of the information to be recorded. </param>
/// <Param
Name = "messagetext"> text to be recorded. </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 = new EventLog ("application ",
Applicationconfiguration. eventlogmachinename,
Applicationconfiguration. eventlogsourcename );
// Write Event Logs

EventLog. writeentry (messagetext, logentrytype );

}
Catch {} // ignore any exceptions
}
} // Class applicationlog

}

12. horizontal panel scrolling and vertical auto Scaling

<Asp: Panel
Style = "overflow-X: Scroll; overflow-Y: auto;"> </ASP: Panel>

13. Press enter to convert to 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! = 'Textea ');
Event. keycode = 9;
</SCRIPT>

Onkeydown = "If (event. keycode = 13) event. keycode = 9"

14. DataGrid super join Column

Datanavigateurlfield = "field name" datanavigateurlformatstring = "http: // XX/INC/Delete. aspx? Id = {0 }"

15. The row of the DataGrid changes 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

<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 = "selected">
<Headerstyle wrap = "false"
Horizontalalign = "center"> <Itemtemplate>
<Asp: checkbox
Id = "chkexport" runat = "server"/>
</Itemtemplate>
<Edititemtemplate>

<Asp: checkbox id = "chkexporton" runat = "server" enabled = "true"/>

</Edititemtemplate>
</ASP: templatecolumn>

BackgroundCode

Protected void checkall_checkedchanged (Object sender, system. eventargs E)

{
// Change the column selection to select all or all columns.
Checkbox chkexport;
If (checkall. Checked)

{
Foreach (maid in mydatagrid. Items)
{

Chkexport = (checkbox) odatagriditem. findcontrol ("chkexport ");

Chkexport. Checked = true;
}
}
Else
{

Foreach (maid in mydatagrid. Items)
{
Chkexport
= (Checkbox) odatagriditem. findcontrol ("chkexport ");
Chkexport. Checked =
False;
}
}
}

17. digit 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

[ASPX page: <% # databinder. eval (container. dataitem, "company_ureg_date") %>

Shown as: 19:44:28

I only want]

<% #
Databinder. eval (container. dataitem, "company_ureg_date", "{0: yyyy-m-d}") %>

How should I change it?

[Format date]

It is usually the object (datetime) objectfromdb). tostring ("yyyy-mm-dd ");

[Date verification expression]

A. The correct input format is as follows: [], [10:29:39], []

^ (\ 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-sensitive conversion]

Httputility. htmlencode (string );

Httputility. htmldecode (string)

19. How to set global variables

In global. asax

Application_start () event

Add application [attribute name] = xxx;

Is your global variable