Now, when I define a TreeNode List such as:
List node = otherNode.getChildren();
I get two warnings.
For the left side: "TreeNode is a raw type. References to generic type TreeNode should be parameterized"
For the right side: "Type safety: The expression of type List needs unchecked conversion to conform to List"
This also creates a code breaking issue when trying to use a for loop to iterate though the list like this:
for(TreeNode loopingNode : node.getChildren())
{
...
}
I receive an actual error: "Type mismatch: cannot convert from element type Object to TreeNode"
These issues were only raised when upgrading from PrimeFaces 10.0.0 to PrimeFaces 11.0.0. Why would this be? I have looked through the migration guide (https://primefaces.github.io/primefaces/11_0_0/#/../migrationguide/11_0_0), but I do not think I see anything about this.
Yes. See:
https://github.com/primefaces/primefaces/pull/7525/files#diff-76612635b2ee16c50bf86c76f7b8400e887e790e9ba89e18fb4e79694f4454d1
https://github.com/primefaces/primefaces/issues/7523
This was added in 11.0.0 RC 1. I'll add a note to the migration guide.
Related
I understand that the "msg" field can be accessed by
(.getMessage (ex-info "message" {:a 123}))
However, I just don't see the reason that ExceptionInfo has a msg field. Clojure core doesn't even provide an proper interface to access this field, e.g. (ex-msg (ex-info ...)).
Does anyone have an example to show how to use this msg field?
In Java, the base Throwable class from which all exceptions extend has a detailMessage field and the ExceptionInfo class inherits it. The JVM will display this message when an exception is thrown.
So, the ex-info has a message to satisfy the class hierarchy above it and to work in standard ways with Java and the JVM. The typical way to use it is to use standard Java interop call to .getMessage like you've done in the question. You will also see it you use things like pst.
I need to set the Xaml property of a RichTextBox user control via a binding expression in Windows Phone 8, and I found that it is not a DP, so I have decided to inherit from a RichTextBox and add a DP that will change the Xaml property with PropertyChanged event, anyways the code looks like this, stripped out irrelevant parts.
public class RichTextBoxWithBindableXaml : RichTextBox
{
public string BindableXaml
{
get { return (string)GetValue(BindableXamlProperty); }
set { SetValue(BindableXamlProperty, value); }
}
public static readonly DependencyProperty BindableXamlProperty =
DependencyProperty.Register("BindableXaml",
typeof(string),
typeof(RichTextBoxWithBindableXaml),
new PropertyMetadata(0));
}
//xaml code
<local:RichTextBoxWithBindableXaml BindableXaml="{Binding PageContent , Mode=OneWay}"> </local:RichTextBoxWithBindableXaml>
And I get the following dreaded exception message:
Object of type 'System.Windows.Data.Binding' cannot be converted to type 'System.String'.
I have checked many solutions to these exceptions and similar problems with data binding, and still going through the suggested similar questions on the right, and still cannot see why a simple thing wont work for me. The code I listed above is just the simplest implementations of a DP with a binding expression. Btw, the source PageContent is from a INotifyPropertyChanged object, and it works, I know because, it can bind to TextBlock's Text property.
Am I missing out something so obvious? I wouldn't want to post question for such a straightforward thing, but I cant seem to solve in any way.
EDIT:
Following P.S note turned out to be completely irrelevant.
P.S. My final doubt was on the way xmlns namespace local is loaded. It is loaded as clr assembly, could xaml parser think my custom inherited class as clr-only and confuse since clr properties are not dependency properties. Hope it doesnt sound stupid, i'm desperate. It is as such :
xmlns:local="clr-namespace:RumCli"
I found out that I should either provide a null PropertyMetadata (new PropertyMetadata(null) instead of 0), or a metadata with a default value type if the DP is supposed to be used in Xaml. For my sceneario, since I will make use of the PropertyChangedCallback, the propertymetadata that will passed to the Register method looks like this.
new PropertyMetadata(default(string), new PropertyChangedCallback(OnBindableXamlChanged))
hope, it helps to others.
For each dependency property one must supply a non subscribed value (not a C# term here) which suites the type of object which the consumer will access.
To quote MSDN Dependency Property Metadata
Dependency property metadata exists as an object that can be queried to examine the characteristics of a dependency property.
So for the value type results, a default for the different value types, such as a double is to use double.NaN. A decimal use decimal.Zero. While a string, string.empty is good as a base.
That allows whatever operation which may blindly reflect off of the property, it can determine what its true property type is and access it accordingly.
So assigning 0 to a string makes no sense in identifying that the property is a string which 0 identifies it as an integer. So the int as string is setting up a future runtime failures when objects try to assign bindings, styles and other items to it.
Suppose I am binding using
bs.Bind(y)
.For(v => v.Visibility)
.To("Failures['TaxPercent'].Length")
.WithConversion("Visibility")
.WithFallback(false);
Where Failures is a dictionary which would contain the property name (e.g. TaxPercent) if, and only if, the property fails validation.
Therefore Failure['TaxPercent'] returns the validation failure message (e.g value missing).
I want to have an expandable textview in Android which is visible only when the error is detected. I used the above code and it is not working. The fallback value does not trigger when Failure['TaxPercent'] does not exist in the dictionary.
How do I get an expandable/collapsible textview based on the validation result using a dictionary in the viewmodel??? I would really like to use a dictionary because that would save me from creating IsErrorVisible for each property.
Oddly enough, using a dictionary works for retrieving the error message though, but not for visibility! In other words, this is working great
bs.Bind(y)
.For(v => v.Text)
.To("Failures['TaxPercent']");
Also, any reason why I cannot concatenate the binding, meaning can I do this???
bs.Bind(y)
.For(v => v.Text)
.To("Failures['TaxPercent']")
.For(v => v.Visibility)
.To("Failures['TaxPercent'].Length")
.WithConversion("Visibility")
.WithFallback(false);
EDIT
The error msg in the log is
MvxBind:Error:168.86 Problem seen during binding execution for binding Visibility for Failures['TaxPercent'].Length - problem ArgumentException: The value passed in must be an enum base or an underlying type for an enum, such as an Int32.
If the dictionary doesn't contain an entry for 'TaxPercent' then the expression Failures['TaxPercent'].Length will not evaluate (an exception will be throw) so UnsetValue will be used.
In the case of UnsetValue, the ValueConverter will not be called, and the Fallback will be used. This is the same pattern as in Wpf - http://msdn.microsoft.com/en-us/library/system.windows.dependencyproperty.unsetvalue(v=vs.110).aspx
For your particular situation, it looks like you could either:
change the Fallback to the correct value for the platform instead of to a boolean value (the question didn't specify which platform(s) you are using)
create a new Visibility ValueConverter that takes Failures as its binding source and 'TaxPercent' as its parameter
remove the .Length from your binding expression - just test on the existence of the entry.
you could switch to free text binding expressions - then you could do more complicated binding statements, including nested bindings, multiple value converters, multiple fallback values, ...
For this particular case, I would just drop the .Length
For "any reason why I cannot concatenate", that won't work as the return type of Bind is a single Fluent binding entry - not a Fluent binding set.
I'm learning Dart and was reading the article Using Dart with JSON Web Services, which told me that I could get help with type checking when converting my objects to and from JSON. I used their code snippet but ended up with compiler warnings. I found another Stack Overflow question which discussed the same problem, and the answer was to use the #proxy annotation and implement noSuchMethod. Here's my attempt:
abstract class Language {
String language;
List targets;
Map website;
}
#proxy
class LanguageImpl extends JsonObject implements Language {
LanguageImpl();
factory LanguageImpl.fromJsonString(string) {
return new JsonObject.fromJsonString(string, new LanguageImpl());
}
noSuchMethod(i) => super.noSuchMethod(i);
}
I don't know if the noSuchMethod implementation is correct, and #proxy seems redundant now. Regardless, the code doesn't do what I want. If I run
var lang1 = new LanguageImpl.fromJsonString('{"language":"Dart"}');
print(JSON.encode(lang1));
print(lang1.language);
print(lang1.language + "!");
var lang2 = new LanguageImpl.fromJsonString('{"language":13.37000}');
print(JSON.encode(lang2));
print(lang2.language);
print(lang2.language + "!");
I get the output
{"language":"Dart"}
Dart
Dart!
{"language":13.37}
13.37
type 'String' is not a subtype of type 'num' of 'other'.
and then a stacktrace. Hence, although the readability is a little bit better (one of the goals of the article), the strong typing promised by the article doesn't work and the code might or might not crash, depending on the input.
What am I doing wrong?
The article mentions static types in one paragraph but JsonObject has nothing to do with static types.
What you get from JsonObject is that you don't need Map access syntax.
Instead of someMap['language'] = value; you can write someObj.language = value; and you get the fields in the autocomplete list, but Dart is not able to do any type checking neither when you assign a value to a field of the object (someObj.language = value;) nor when you use fromJsonString() (as mentioned because of noSuchMethod/#proxy).
I assume that you want an exception to be thrown on this line:
var lang2 = new LanguageImpl.fromJsonString('{"language":13.37000}');
because 13.37 is not a String. In order for JsonObject to do this it would need to use mirrors to determine the type of the field and manually do a type check. This is possible, but it would add to the dart2js output size.
So barring that, I think that throwing a type error when reading the field is reasonable, and you might have just found a bug-worthy issue here. Since noSuchMethod is being used to implement an abstract method, the runtime can actually do a type check on the arguments and return values. It appears from your example that it's not. Care to file a bug?
If this was addressed, then JsonObject could immediate read a field after setting it to cause a type check when decoding without mirrors, and it could do that check in an assert() so that it's only done in checked mode. I think that would be a nice solution.
I've added: using System.Data.Entity;
and now I don't get an error on compilation of this:
var k = db.Countries.Include(e => e.Cities);
but I still have to manually go into the database schema and check the current table correct name and copy-paste/type it in the code.
There is no IntelliSense after I use the period:
var k = db.Countries.Include(e => e.
So, the purpose of all this is questionable since it doesn't really help at all. Typing manually the table name (entity set name) in quotation marks isn't any different than typing it in a lambda expression - except for it is shorter as a string.
Hints?
Seems like your problem will be resolved when you add
using System.Data.Entity;
to top of your page
Seems like the problem is in ReSharper 6 IntelliSense. After turning off ReSharper 6 IntelliSense, the original VS2010 IntelliSense works fine. The bug has been reported.