Reading settings in Web.config
Conn = new SqlConnection (configurationsettings.appsettings["cnfriends.connectstring"));
<appSettings>
<!--User application and configured property settings Go here.-->
<!--Example: <add key= "Settingname" value= "Settingvalue"/>-->
<add key= "cnfriends.connectionstring" value= "Data source= (local) \netsdk;initial Catalog=friendsdata;user"/ > </appSettings>
Several namespaces
When a dataset is used, the using system is used. Data.sqlclient
When web.config is configured, the using system is used. Configuration
This reminds me of a freshman learning C language.
BOOL Visible
Btnsearch.text = visible? "New Search": "Search";
This one's fine.
dsresult.tables["Users"].rows.count
Conver.tonint32 (configurationsettings.appsettings["Cokuale.number"]);
Tough enough. 1: Save results with session and bind
session["Search"] = dsresults;
Dsresults = (DataSet) session["Search"];
Grdresults.databind ();
In fact, session,application is the object type, so the last thing you want to do is explicitly convert the type
By the way, it is null to judge whether the value of the string type is taken.
Tough enough. 2: Select rows from the DataTable
datarow[] rows = dsresults.tables["Users". Select (filter);
Dsresults = Dsresults.clone ();
foreach (DataRow row in rows)
{
dsresults.tables["Tables"]. ImportRow (row);
}
Gets a control on the WebForm
ImageButton img = (ImageButton) e.item.findcontrol ("Selectbutton")
Jump:
Server.Transfer ("caoxicao.aspx");
Server Control Add JS script (Attributes property)
IMGSHOW.ATTRIBUTES.ADD ("onclick", "document.getElementById (' Tbprefs '). style.display = ' block ';");
Again (style attribute),
Img. Style.add ("Cursor", ' pointer ');
Color correlation:
Colorconvert CV = new Colorconvert ();
Color selected = Color.Empty;
Selected = (olor) CV. ConvertFromString (white);
Add cookies
RESPONSE.COOKIES.ADD (New HttpCookie ("BackColor", R))
My favorite----user control
Using Friendsreunion.controls;
protectd override void Oninit (EventArgs e)
{
Friendsfooter _footer = (friendsfooter) LoadControl (request.applicationpath+ "/controls/friendsfooter.aspx");
Subheader _subheader = new Subheader ();
}
Page.Contros.AddAt (0,_footer);
Page.Contros.AddAt (0,_subheader);
Base. OnInit (e);
}
New HTML Control Instance
HtmlGenericControl div = new HtmlGenericControl ("div");
Div. Style.add ("Background-color", BG);
Use this class to represent HTML server control tags that are not directly represented by the. NET Framework classes, such as <span>, <div>, <body>, and <font>
return dataset
Public DataSet Contacts ()
{
String sql = "@ Select * from ...";
DataSet requests = new DataSet ();
New Sqldtaadapter (sql,conn). Fill (requests);
return requests. GETXML ();
return requests;
}
Receive: (When the return value is a dataset in XML format)
DataSet results = new DataSet ();
Results.readxml (new StringReader, FI. Contactrequest (userid)));
When using WebService, simply add the [WebMethod] feature to the Method!
If you add a cache, [WebMethod (cachedurition=600)]
Instantiation of WebService
Friendsservice.friendsinfo fi = new Friendsservice.friendsinfo ();
String userid;
Userid = fi. GetUserID ("...");
Little tips!
HyperLink reg = new HyperLink ();
Reg.tooltip = "...";
Check out:
System.Web.Security.Forms.Authentication.SignOut ();
Response.Write (Request.applicaltionpath);
Track Debugging:
Trace.Write
Trace.Warn
Abnormal:
1. Throw an exception
Program Exception thrown
Throw new ***exception ("...");
2. Catch exception
Must be thrown from a try code block at the start, and the try block is used to place all the code that might throw an exception.
Eg:
Try
{
... ...
}
Catch (argumentnullexeption e)
{
...
}
Unhandled exception Web.config settings
<custom Errors mode = "on" Defaultredriect = "customerror.aspx"; />
