Problem in dynamically adding event in wpf

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Hi Im using following code to add loding row event to datagrid in wpf

XML

grdpurchase.LoadingRow += new EventHandler<DataGridRowEventArgs>(grdpurchase_LoadingRow);
            grdpurchase.ItemsSource = arr;//ArrayList
            grdpurchase.LoadingRow -= new EventHandler<DataGridRowEventArgs>(grdpurchase_LoadingRow);

but This is not working after add the item source please help me to solve tis issue
Im using C#

Posted 18-Aug-14 21:05pm

Member 10296413

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ashok rathod · Accepted Answer · 2014-08-19T17:49:00

Solution 1

I think your Ordering of Attaching and Detaching Might become Problamatic Here. In Ideal Situation It should be Detaching First and then attaching the event.Where as You had done it Totally Reverse. Please Check it by Considering this facts by Changing code as below.

XML

 grdpurchase.LoadingRow -= new EventHandler<DataGridRowEventArgs>(grdpurchase_LoadingRow);
grdpurchase.LoadingRow += new EventHandler<DataGridRowEventArgs>(grdpurchase_LoadingRow);
 grdpurchase.ItemsSource = arr;//ArrayList

Posted 19-Aug-14 17:49pm

ashok rathod

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Member 10296413 20-Aug-14 8:12am

I'm written code to find the sum of Amount column in the grid In loading row event its working fine
but when i Click on header it calculating the sum again to solve this i'm keeping that event Active only binding time
but that code not removing the event after bind

ashok rathod 21-Aug-14 2:07am

Please check that order of Loading Row and your Click on Header. I think it will first call your Loading Row. What you can do is create one page level variable and assigned it with first time true and then once loadingrow is completed make it false after that when your header gets clicked at that time this variable value will be false and in your loading row mechanism you can check this global variable value. This might be dirty trick. but i think will work for you,