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Downdroplist binds the tree structure and changes the second string.

Source: Internet
Author: User
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Question 1

Assume that there is a string "aspkxiexhxlaspxxjmxaspmxj ";
How to replace the second ASP with the * number?
The string length is not fixed and will change.

String STR = "aspkxiexhxlaspxxjmxaspmxj ";
Int I = 0;
STR = RegEx. Replace (STR, "asp", new matchevaluator (delegate (match) {return I ++ = 1? "*": Match. value ;}));
Console. writeline (STR );

Dropdownlist dynamically binds database tables to implement directory tree

Static datacolumn column = new datacolumn ();
Static datatable table = new datatable ();

Static datarow myrow;
Public static datatable getcategorytree (webinfobase info)
{
Datatable dt = info. list (_ defaultdb, "", "[ID], [title], [parentid], [childnum], [depth], [orderno]", "& version = ", "[ID] ASC ");

If (table. Rows. Count> 0)
{
Table. Columns. Clear ();
Table. Rows. Clear ();
}
Createdatatable ();
Gettree (DT, "0", 0 );
Return table;
}
Public static void gettree (datatable DT, string PID, int blank)
{
String STR = "";
Dataview DV = new dataview (DT );
DV. rowfilter = "parentid =" + PID;
If (blank> 0)
{
String S = "";
If (blank = 1)
{
STR = "success ";
}
For (INT I = 2; I <= blank; I ++)
{
S = S + "|" + "" + "-";
}
STR = S + "success ";
}

Foreach (datarowview DRV in DV)
{
String id = DRV ["ID"]. tostring ();
String title = DRV ["title"]. tostring ();
String orderno = DRV ["orderno"]. tostring ();
String parentid = DRV ["parentid"]. tostring ();
String depth = DRV ["depth"]. tostring ();
String childnum = DRV ["childnum"]. tostring ();

Myrow = table. newrow ();
Myrow ["ID"] = int. parse (ID );
Myrow ["title"] = STR + title;
Myrow ["orderno"] = int. parse (orderno );
Myrow ["parentid"] = int. parse (parentid );
Myrow ["depth"] = int. parse (depth );
Myrow ["childnum"] = int. parse (childnum );
Table. Rows. Add (myrow );

Int n = int. parse (depth );
// If (n <= 1)
//{
N ++;
//}
Gettree (DT, ID, N );
}
}
Public static void createdatatable ()
{
Table. Columns. Clear ();
Column = new datacolumn ();
Column. datatype = system. type. GetType ("system. int32 ");
Column. columnname = "ID ";
Table. Columns. Add (column );

Column = new datacolumn ();
Column. datatype = system. type. GetType ("system. int32 ");
Column. columnname = "parentid ";
Table. Columns. Add (column );

Column = new datacolumn ();
Column. datatype = type. GetType ("system. String ");
Column. columnname = "title ";
Table. Columns. Add (column );

Column = new datacolumn ();
Column. datatype = type. GetType ("system. int32 ");
Column. columnname = "childnum ";
Table. Columns. Add (column );

Column = new datacolumn ();
Column. datatype = type. GetType ("system. int32 ");
Column. columnname = "depth ";
Table. Columns. Add (column );

Column = new datacolumn ();
Column. datatype = type. GetType ("system. int32 ");
Column. columnname = "orderno ";
Table. Columns. Add (column );
// Table. Columns. Clear ();

}

Baidu and Google

I did this.
A new page is created.
In the front-end code:
<Body ms_positioning = "gridlayout">
<Form ID = "form1" method = "Post" runat = "server" target = "result">
<Font face = ""> </font>
<Tbody>
<Tr>
<TD>
<Asp: textbox id = "text1" runat = "server" width = "95px" Height = "22"> </ASP: textbox>
<Asp: button id = "BTN" text = "Baidu search" runat = "server" width = "72px" Height = "24"> </ASP: button>
</TD>
</Tr>
</Form>
</Body>
The background code, that is, the Click Event of the button, is:
Private void btn_click (Object sender, system. eventargs E)
{
Response. contentencoding = system. Text. encoding. getencoding ("gb2312 ");
Response. Redirect ("http://www.baidu.com/s? WD = "+ text1.text +" & CL = 3 ");
}

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Related Keywords:
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