Double click datagrid row to open edit form in WPF C#

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double click datagrid row to open edit form in wpf c#

i want to open selected row grid details to another form with filling.

Company editcompany = new Company();

DataRowView drv = dgvCommon.SelectedItem as DataRowView;

editcompany.cmpID = Convert.ToInt32(drv["CompanyId"].ToString());

NavigationService navService = NavigationService.GetNavigationService(this);

navService.Navigate(editcompany);

What I have tried:

i got error in this line like
Object reference not set to an instance of an object.

editcompany.cmpID = Convert.ToInt32(drv["CompanyId"].ToString());

Posted 19-Dec-16 22:20pm

krish.krish

Updated 19-Dec-16 23:24pm

v2

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Afzaal Ahmad Zeeshan · Accepted Answer · 2016-12-19T23:24:00

Solution 1

Error message is pretty much neat and tells you clearly what is wrong. Your object is null, use this,

C#

editcompany.cmpID = Convert.ToInt32((drv["CompanyId"] ?? String.Empty).ToString());

You can also use a simple if...else block to check for null values prior.

What Is A Null Error in Code Execution[^]
c# - Checking for null before ToString() - Stack Overflow[^]
C# approach to prevent null references in strings - Code Review Stack Exchange[^]

Posted 19-Dec-16 23:24pm

Afzaal Ahmad Zeeshan

Comments

krish.krish 20-Dec-16 5:31am

again its showing same error on that line

Afzaal Ahmad Zeeshan 20-Dec-16 5:33am

Then make sure your entire object is not null — wrap the code inside an if...else, and debug the code to see where an object is null. Then set those object(s) to an instance.

krish.krish 20-Dec-16 5:36am

i already have switch case statement.

Afzaal Ahmad Zeeshan 20-Dec-16 5:39am

How do you implement a switch statement? Does it check for any null values?

krish.krish 20-Dec-16 5:40am

see my code

switch (formname)
{
case "Company Master":
{
Company editcompany = new Company();

DataRowView drv = dgvCommon.SelectedItem as DataRowView;

editcompany.cmpID = Convert.ToInt32((drv["CompanyId"] ?? String.Empty).ToString());

editcompany.operation = Operation;

NavigationService navService = NavigationService.GetNavigationService(this);

navService.Navigate(editcompany);

break;
}
case "Customer Master":
{
Customer editcustomer = new Customer();

DataRowView drv = dgvCommon.SelectedItem as DataRowView;

editcompany.cusid= Convert.ToInt32((drv["cusid"] ?? String.Empty).ToString());

editcustomer.operation = Operation;

NavigationService navService = NavigationService.GetNavigationService(this);

navService.Navigate(editcustomer);
break;
}

}

Afzaal Ahmad Zeeshan 20-Dec-16 5:42am

That does not check for any null values. That is why, it will not work for what I am saying. You need something like,


if (drv != null) {
   // code.
}

Something like this.

krish.krish 20-Dec-16 5:50am

drv value is null

Afzaal Ahmad Zeeshan 20-Dec-16 5:59am

Then set it to a new object. :-)

Such as, new DataRowView etc.

krish.krish 20-Dec-16 5:42am

please help me i want datagrid selected row data in another form with filling