How to cover only the selected lines in a DataGrid

thomaz · December 6th, 2004, 11:37 AM

Hi again...

There is a DataGrid method or any way (like Foreach) to cover only the 10 or 20 selected lines in a DataGrid with 3000 lines???

Thanks....

mehdi62b · December 8th, 2004, 12:23 PM

Hello,
get the selected rows by below code(they are copied in an arraylist),

Code:

public ArrayList GetSelectedRows(DataGrid dg)  
{ 
     ArrayList al = new ArrayList(); 
     CurrencyManager cm = (CurrencyManager)this.BindingContext[dg.DataSource, dg.DataMember]; 
     DataView dv = (DataView)cm.List; 
     for(int i = 0; i < dv.Count; ++i) 
     { 
          if(dg.IsSelected(i)) 
               al.Add(i); 
     } 
     return al; 
}

then set RowFilter property of your DataView with the ID's in your arraylist,

Code:

    string s=""; 
    foreach(object o in GetSelectedRows(dataGrid1)) 
     { 
          s+= "ID ="+o.ToString()+"OR"; 
     }
     //eliminate last "OR" from your string
     dv.RowFilter=s;
     //set the datasource of your grid with dv and bind ur grid

(this method just works in Windows Applications),
HtH.

_____________________________
Mehdi.
software engineering student.
Looking for a good job for summer 2005.

thomaz · December 9th, 2004, 02:27 PM

Thanks MEHDI62B,

your answer solve all of my problems...

Thanks a lot...

mehdi62b · January 19th, 2005, 10:44 AM

(ur welcome)another point,
instead of string variables,usually it's better to use StringBuilder because using strings
causes the creation of temporary strings,

Code:

//instead of 
s+=<yourVariable>
//use a StringBuilder
StringBuilder s = new StringBuilder();
s.Append(<yourVariable>);

(another theoretical calculation from a college student :D)!

_____________________________
Mehdi.
software engineering student.
Looking for a good job for summer 2005.