Read settings in Web. config
Conn = new SqlConnection (ConfigurationSettings. etettings ["cnFriends. ConnectString"]);
<Deleetask>
<! -- 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 id = sa"/> </appSettings>
Several namespaces
When DataSet is used, using system. Data. SqlClient is used.
When configuring Web. config, use using system. Configuration
This reminds me of the C language I learned in my freshman year.
Bool visible
BtnSearch. Text = visible? "New Search": "Search ";
This is pretty good.
DsResult. tables ["Users"]. rows. count
Conver. Tonint32 (ConfigurationSettings. receivettings ["Cokuale. number"]);
1: Use Session to save the result and bind it
Session ["Search"] = dsResults;
DsResults = (DataSet) Session ["Search"];
GrdResults. DataBind ();
In fact, sessions and applications store the object type. Therefore, the type must be explicitly converted.
By the way, null is used to determine whether a value of the string type is obtained.
Hard enough 2: Select rows from DataTable
DataRow [] rows = dsResults. Tables ["Users"]. Select (filter );
DsResults = dsResults. Clone ();
Foreach (DataRow row in rows)
{
DsResults. Tables ["Tables"]. ImportRow (row );
}
Obtain a control on webForm.
ImageButton img = (ImageButton) e. Item. FindControl ("Selectbutton ")
Jump:
Server. Transfer ("Caoxicao. aspx ");
Add a js script (Attributes attribute) to the server control)
ImgShow. Attributes. Add ("onclick", "document. getElementById ('tbprefs'). style. display = 'block ';");
(Style attribute ),
Img. Style. Add ("Cursor", 'pointer ');
Color:
ColorConvert cv = new ColorConvert ();
Color selected = Color. Empty;
Selected = (olor) cv. ConvertFromString (White );
Add Cookie
Response. Cookies. Add (new HttpCookie ("backColor", r ))
My favorites-User Controls
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 );
}
Create an Html control instance
HtmlGenericControl div = new HtmlGenericControl ("div ");
Div. Style. Add ("background-color", bg );
This class can be used to mark HTML server controls that are not directly represented by the. NET Framework class, such as <span>, <div>, <body>, and <font>
Return DataSet
Public DataSet Contact ()
{
String SQL = "@ Select * from... ...";
DataSet requests = new DataSet ();
New SqlDtaAdapter (SQL, conn). Fill (requests );
// Return requests. GetXml ();
Return requests;
}
Receiving: (when the returned value is a dataset in Xml format)
DataSet results = new DataSet ();
Results. ReadXml (new StringReader (fi. ContactRequest (userid )));
When using WebService, you only need to add the [WebMethod] feature to the method!
If a cache is added, [WebMethod (CacheDurition = 600)]
Instantiate WebService
FriendsService. FriendsInfo fi = new FriendsService. FriendsInfo ();
String userid;
Userid = fi. GetUserID ("…");
Small Tips!
HyperLink reg = new HyperLink ();
Reg. ToolTip = "… ...";
Check out:
System. Web. Security. Forms. Authentication. SignOut ();
Response. write (Request. ApplicaltionPath );
Tracking debugging:
Trace. Write
Trace. Warn
Exception:
1. Throw an exception
Program exception thrown
Throw new *** Exception ("…");
2. Capture exceptions
It must start with a try code block, which is used to hold all codes that may throw exceptions.
Eg:
Try
{
... ...
}
Catch (ArgumentNullExeption e)
{
...
}
Unhandled exceptions web. config settings
<Custom Errors mode = "on" defaultRedriect = "customerror. aspx";/>
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
