The merge method combines two data tables with similar structures into one data table:
Instance
Code :
// Create Table1 Datatable dt1 = New Datatable (); dt1.columns. Add ( " ID " ); Dt1.columns. Add ( " Name " ); Dt1.columns. Add ( " PWD " ); For ( Int I = 0 ; I 5 ; I ++ ) {Dt1.rows. Add ( New Object [] {I. tostring (), " Name " + I. tostring (),
DataTable to JSON JSON to DataTableDataTable to JSON#region DataTable to JSONprivate String Dtb2json (DataTable dtb){JavaScriptSerializer JSS = new JavaScriptSerializer ();ArrayList dic = new ArrayList ();foreach (DataRow row in DTB. Rows){Dictionaryforeach (DataColumn col in DtB. Columns){Drow. Add (Col. ColumnName, Row[col. ColumnName]);}Dic. ADD (drow);}Return
for(inti =0; i ) { strings ="Select COUNT (*) from"+ dt. rows[i]["aliasname"] +". Dbo.web_historydata where factoryid="+ dt. rows[i]["Factoryid"] +"and datetime >dateadd (Hour,-1,getdate ())"; intCount =my_sqlhelper.selectcounts (s); if(count0) {Log.save ("Shu Hkta is so handsome."); } }If you don't know what the column name is, you can also traverse for (int0; i ) { for (int0; j ) { Console.Writ
Delete a repeated DataTable column. Only duplicate rows in one of the columns are deleted. One datatable ColumnVs2005 has encapsulated deduplication methods for datatable:
1 // remove duplicate rows 2 DataView dv = table. defaultView; 3 table = dv. toTable (true, new string [] {"name", "code"}); 4 5 at this time, the table only has two rows: name and code, if the
Repeated datatable initialization and datatable Initialization
The datatable version written in my blog is 1.10 or later. I have not studied whether to use the previous version.
View errors directly
DataTables warning: table id = rap-table-list-comm-mem-Cannot reinitialise DataTable. For more information about this
We are working on ADO today. NET adapter automatically triggers the database update function for data, and finds a very strange problem. Originally, data operations were performed by their own code to complete the update, and this method was never involved, so it was a problem.
1 SQLiteDataAdapter dataAdpater = new SQLiteDataAdapter("Select cid,sd from VC", conn); 2 dataAdpater.DeleteCommand = new SQLiteCommand("delete From VC Where cid = @cid", conn); 3 dataAdpater.DeleteCommand.Parameters.Ad
Export DataGridView, DataTable to Excel, datatable to export excel
Recently, the speed of exporting a dview to Excel is slow, and the data volume is small. However, the number of columns of fields is large (about 2000). I checked many methods on the Internet to check whether it is slow or not,
Or it cannot run normally. After modification, it passes debugging and the export process is much faster than befo
Two tables A and B, the two tables have the same structure. Now it is necessary to copy some of the rows in table A to table B, using DataTableB.rows.add (Datatablea.rows[0]) as a way to report "Row already belongs to a table" error;Method One: //get some of the rows in table adatarow[] DrA = Dta.select ("aimtype=3"); //Instance BDataTable DtB =Dta.clone (); if(Dra.length >0) { foreach(DataRow DrvalinchDrA) {
A DataTable represents a memory-related datasheet that can be created and used using control drag-and-drop in a toolbar, and can be created and used independently of the programming process as needed, most commonly as a member of a dataset. In this case, you need to use the dynamic creation of the data table as needed during the programming process. In section 8.4, the data table of a DataTable and its oper
1. Data Conversion class
public class Datatablereturnobject {private int itotalrecords;
private int itotaldisplayrecords;
Private String Secho;
Private string[][] Aadata; Public datatablereturnobject (int totalrecords, int
HTML code
home > u3d Management > Model Management Date range: Search Products emptying & Lt;div class= "mt-20" > Serial number Product id Model id Product name Product List Chart & lt;/th> Model Preview Upload time
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.