Wpf new window not opening

Question

1.00/5 (1 vote)

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I want to open a new window after I select a file from ShowDialog. I am doing it in MVVM pattern

there is a xaml file exist in

MVVMFileMange.View.UI.SourceFolder1

What I have tried:

try
           {
               Nullable<bool> result = openFileDlg.ShowDialog();

               if (result == true)
               {
                   var test = new MVVMFileMange.View.UI.SourceFolder1();
                   test.ShowDialog();
              }
           }

Posted 6-Jan-21 23:10pm

john321a

Updated 7-Jan-21 2:45am

v4

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Comments

john321a 7-Jan-21 5:43am

here,result = true

but got exception at var test = new MVVMFileMange.View.UI.SourceFolder1();

2 solutions

Solution 1

Use the debugger and see exactly what your dialog is returning - the chances are that it isn't returning true as a result of an OK keypress so your code doesn't get to pass the test and display a second dialog.
Alternatively, it could be the SourceFolder1 constructor is throwing an exception.

Either way, you need your complete code running to work out exactly what is happening, and that means using the debugger. We can't do that for you - we don't have access to the rest of your code!

Posted 6-Jan-21 23:22pm

OriginalGriff

Comments

john321a 7-Jan-21 5:35am

test in var test = new MVVMFileMange.View.SourceFolder1() is null

OriginalGriff 7-Jan-21 5:50am

So now you need to use the debugger to step into the constructor and find out why.

We can't do that for you!

john321a 7-Jan-21 6:11am

it hit on the constructor.but window not shown

OriginalGriff 7-Jan-21 6:46am

So "use the debugger to step into the constructor and find out why."

Seriously, I can't do that for you - I can't even *see* the constructor, much less execute it under the same conditions you do ...

john321a 7-Jan-21 7:08am

public partial class SourceFolder : Window
{
public SourceFolder()
{
InitializeComponent();
}
}

it hit on public SourceFolder() and comes out from here. so the value of the text is "null"

OriginalGriff 7-Jan-21 7:14am

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At the risk of repeating myself:

***
So "use the debugger to step into the constructor and find out why."

Seriously, I can't do that for you - I can't even *see* the constructor, much less execute it under the same conditions you do ...
***

john321a 7-Jan-21 8:46am

thankz @ OriginalGriff

OriginalGriff 7-Jan-21 9:11am

You're welcome!

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john321a · Accepted Answer · 2021-01-07T02:45:00

Solution 2

problem is

getting a callback to a UI component from a background thread

solved by adding below code

Application.Current.Dispatcher.Invoke((Action)delegate{
      // your code
});

Posted 7-Jan-21 2:45am

john321a