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“Items collection must be empty before using ItemsSource.”
...so the fix is to explicitly indicate the property to be set.
Fix the XAML and the exception goes away:
<ListView Name="ListViewImages"
SelectionMode="Single"
ItemsSource="{Binding}">
<ListView.View>
<local:ImageView />
</ListView.View>
&l...
Cannot use identity column key generation with ( TABLE_PER_CLASS )
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The problem here is that you mix "table-per-class" inheritance and GenerationType.Auto.
Consider an identity column in MsSQL. It is column based. In a "table-per-class" strategy you use one table per class and each one has an ID.
Try:
@GeneratedValue(strategy = GenerationType.TABLE)
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How to iterate through a DataTable
....Text = row["ImagePath"].ToString();
}
...assumes the connection is open and the command is set up properly. I also didn't check the syntax, but it should give you the idea.
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How can I test a Windows DLL file to determine if it is 32 bit or 64 bit? [duplicate]
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Gory details
A DLL uses the PE executable format, and it's not too tricky to read that information out of the file.
See this MSDN article on the PE File Format for an overview. You need to read the MS-DOS header, then read the IMAGE_NT_HEADERS structure. This contains the I...
How to center horizontally div inside parent div
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I am assuming the parent div has no width or a wide width, and the child div has a smaller width. The following will set the margin for the top and bottom to zero, and the sides to automatically fit. This centers the div.
div#child {
margin: 0 auto;
}
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Getting a better understanding of callback functions in JavaScript
I understand passing in a function to another function as a callback and having it execute, but I'm not understanding the best implementation to do that. I'm looking for a very basic example, like this:
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Using global variables in a function
...erous." Globals are perfectly fine in every language that has ever existed and ever will exist. They have their place. What you should have said is they can cause issues if you have no clue how to program.
– Anthony
Dec 22 '12 at 23:22
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How do I access the request object or any other variable in a form's clean() method?
...gument, request. This stores the request in the form, where it's required, and from where you can access it in your clean method.
class MyForm(forms.Form):
def __init__(self, *args, **kwargs):
self.request = kwargs.pop('request', None)
super(MyForm, self).__init__(*args, **kwar...
How to determine why visual studio might be skipping projects when building a solution
I am debugging someone else's work and the solution is quite large. When I try to build the entire thing, several projects within the solution don't build and just skip. Viewing the output window during the build process says:
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What is the __del__ method, How to call it?
... ends. In particular, unless there are circular references, CPython (the standard Python implementation) will garbage collect immediately.
However, this is an implementation detail of CPython. The only required property of Python garbage collection is that it happens after all references have been...