Method ToArray() is listed in .NET Framework reference but I can't access it in Powershell. Why? Are there alternatives?
EDIT:
Now I realize it's because I tried to add a value to the list with += as if it were an array. I wonder why it didn't work (help appreciated).
$test=New-Object -TypeName System.Collections.Generic.List[byte]
$test.Add(1)
$test.Add(2)
$test+=3
# NO $test.ToArray() METHOD (BECUASE OF $test+=3)`
I was not able to reproduce the situation you described.
$foo=[system.collections.generic.list[string]]::new()
$foo.Add("A")
$foo.Add("B")
$foo.Add("C")
[string[]]$bar=$foo.ToArray()
$bar.GetType().FullName
"System.String[]"
Related
I just started to use DBx::Class and begun slightly to understand, but it's complex.
I want to call "recursive_update" but I was not able to manage how I can use it.
If I understand the documentation right, I have to include it in the .../My/Schema.pm which was create by DBIx::Class::Schema::Loader?
__PACKAGE__->load_namespaces(default_resultset_class => '+DBIx::Class::ResultSet::RecursiveUpdate');
When I want to update the data I use the ResultSet with the relationships.
my $result = $schema->resultset('Table')->find($id});
$result->recursive_update({
'rel_table' => [....),
});
unfortunately I got an error:
Can't locate object method "recursive_update" via package My::Schema::Result::Table"
Where is my fault?
recursive_update has to be called on a ResultSet object, not a Result object.
You might want to add a helper method to your Result base class (if you already have one else create it, as it makes sense for many things) which gets a ResultSet restricted to the Result object it is called on and calls recursive_update on it.
Getting wired issue like main array has been changed if changed value of another array. I think issue is about copying same address, not sure but just thinking of it. I have tried from last 3 hours but unable to get rid from it.
Look at below illustration to get better idea.
List<page> _pageList;
List<page> _orderList = [];
_pageList = _apiResponse.result as List<page>;
_orderList.add(_pageList[0].element);
_orderList[0].title = "XYZ"
//--> Here if I change the `_orderList[0].title` then it also change the `title` inside "_pageList"
How can we prevent the changes in main array?
I got same issue in my one of the project. What I have done is, use json to encode and decode object that help you to make copy of the object so that will not be affected to the main List.
After 3rd line of your code, make changes like below
Elements copyObject = Elements.fromJson(_pageList[0].element.toJson());
// First of all you have to convert your object to the Map and and map to original object like above
_orderList.add(copyObject);
Hope that will help you.
You can use a getter function to create a copy of your list and use that instead of
altering your actual list.
example:
List<Page> get orderList{
return [..._orderList];
}
Lists in Dart store references for complex types, so this is intended behaviour.
From your code:
_orderList.add(_pageList[0].element);
_orderList[0] and _pageList[0].element point to the same reference (if they are non-primitive).
There is no general copy() or clone() method in dart, as far as i know. So you need to copy the object yourself, if you want a separate instance. (see this question)
I want to modify the ACL of a specific folder. To do this, I need to remove the inherited FileSystemAccessRules, and change them to ReadAndExecute permissions. To do this, I decided to use the ModifyAccessRule() method.
My problem is that I need to use the ModifyAccessRule method, and as part of the constructor, I need a FileSystemAccessRule object that would take the same input.
I am aware that this could be simply solved by not using a pipeline, but I am trying to keep it efficient and within one, hence why no external variables are being used (with the exception of the initial path).
Get-Item $folder_path |
%{$_.GetAccessControl()} |
%{$_.ModifyAccessRule(
"Add",
New-Object System.Security.AccessControl.FileSystemAccessRule(
$_.Access.IdentityReference,
[System.Security.AccessControl.FileSystemRights]::ReadAndExecute,
[System.Security.AccessControl.InheritanceFlags]::ContainerInherit,
[System.Security.AccessControl.PropagationFlags]::None,
[System.Security.AccessControl.AccessControlType]::Allow
)
)}
This is my code at the moment, but it does not work, due to New-Object not being executable inside a constructor. I have searched for a possible replacement, but have not found anything. As you can see, though, all the parts necessary for this new object are available.
Is there some type of format or method I could use to create this FileSystemAccessRule object within another object's constructor?
PS: As a bonus, can anyone confirm that PropagationFlags and InheritanceFlags are at the right values for the folder to not inherit parent permissions but propagate to children? ^-^
Does anyone know if the INotifyPropertyChanged interface can be implemented on an object in Powershell natively, without building a C# class and using Add-Type to generate a new .NET assembly?
I've Googled everything I can think of and haven't been able to find a solution.
Thanks.
I was experimenting using Powershell to load my WPF prototypes, and faced the same situation, so far I found that the solution is very simple it consists of adding interface methods to the powershell class, the last thing to deal with was the CanExecuteChanged event, through the exception message it says the method add_CanExecuteChanged wasnt found, and the solution is simply to add both the event adder and remover, for e
class Relay: System.Windows.Input.ICommand {
[Action[object]]$command;
Relay([Action[object]]$Command){
$this.command = $Command;
}
[void]add_CanExecuteChanged ([System.EventHandler]$handler){}
[void]remove_CanExecuteChanged ([System.EventHandler]$handler){}
[bool]CanExecute([object]$arg) {return $true; }
[void]Execute ([object]$arg){ $this.command?.Invoke($arg); }
}
for the INotifyPropertyChanged the situation is different since it needs getters and setters, and a call to the PropertyChanged handler on setters, the properties in powershell can be implmented as fields in C# and behind the scenes powershell add get_* and set_, which is the case in the dotnet when adding properties in the ggenerated IL you found get_, set_* methods which represents the getters and setters, for example:
class Demo {
[string]$MyProperty;
}
if you do a Get-Member -Force on an instance in the result you will find (get_MyProperty, set_MyProperty) methods, but when I tried to do so "for example like in java" the methods wont execute, but however I tried the binding without these methods and it works fine, here is my gist of the experiment, with bindings working in two way mode:
https://gist.github.com/mouadcherkaoui/7b0f32d9dbefa71102acdbb07299c9bb
and here is the source I modified, the repos it self contains a lot of good scripts:
https://github.com/SammyKrosoft/PowerShell/blob/master/How-To-Load-WPF-From-XAML.ps1
Best Regards.
No. Consider PowerShell a CLI consumer language and not so much a producer language. That is you can construct and use most .NET types. However PowerShell doesn't natively provide a facility to create new .NET types much less types that implement interfaces. While you can create custom objects in PowerShell and use tricks to give those objects a type name that PowerShell understands, those tricks don't work with .NET libraries like WPF.
At the moment i have an application (web/silverlight) where the connectionstring for my ObjectContext is dynamic. It is based on how a user logs in because each of my customers have their own database. ie.. username#domain. I'm trying to find a way to use the EFContextProvider which would be by either passing the ObjectContext through the constructor, or by overriding the GetConnectionString, which sadly both aren't supported.
Is there a way to accomplish this, or can i download the source for the EFContextProvider somewhere so i can implement it myself ?
Thanks in advance.
This question was posted by Marcel on our IdeaBlade forums. I am reposting the question and answer here since I think it will be useful to the Breeze Stack Overflow community.
You shouldn't have to download the source and modify it for such a simple thing. And now you won't have to.
We've pushed to GitHub a simple update to EFContextProvider. This change will appear in the next Breeze Runtime version (> 0.81.2).
Where EFContextProvider used to create the 'T' (your ObjectContext/DbContext) as follows:
_context = new T();
It now calls upon a virtual method, T CreateContext() instead, whose default implementation is:
protected virtual T CreateContext() {
return new T();
}
Override and replace that in your EFContextProvider subclass and you will be able to make your context of type 'T' just the way you like it.
N.B.: The base EFContextProvider will still do a little post-creation configuration to make sure it behaves as we expect; we don't want the context doing any lazy loading or creating proxies.
So if 'T' is an ObjectContext, the provider will do this:
objCtx.ContextOptions.LazyLoadingEnabled = false;
and if 'T' is a DbContext it will do this:
dbCtx.Configuration.ProxyCreationEnabled = false;
dbCtx.Configuration.LazyLoadingEnabled = false;
I downloaded the source and added a constructor to the
EFContextProvider which accepts an instance of T to be able to use an
existing ObjectContext/DbContext which works like a charm.
Marcel figured it out by himself and answered his own question on our forum.
The CreateContext virtual method, mentioned by Ward, is now available in v 0.83.2