UI not updating for bound element

UI not updating for bound element

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UI not updating for bound element
Tag : chash , By : Shrek Qian
Date : November 24 2020, 03:01 PM

To fix this issue You are not implementing PropertyChanged correctly. The event model for .NET requires that the sender argument of the invoked delegates is set to the reference of the object actually raising the event. You set that value to null. Your code should use this instead:
protected void NotifyPropertyChanged([CallerMemberName] string propertyName = null)
    PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));

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KnockoutJS; Either bound value not updating or ko.computed() not updating

Tag : javascript , By : evegter
Date : March 29 2020, 07:55 AM
I wish did fix the issue. What happens here is that you are not dealing with references to the same object. Here is a sample:
var a = { name: "Bob" };
var b = { name: "Bob" };
var c = b;

alert(a === b); //false
alert(b === c); //true

Bound WPF TextBox is not updating value when the bound property enforces some business rules

Tag : chash , By : afds
Date : March 29 2020, 07:55 AM
Any of those help This seems to be a bug with the TextBox in .NET 3.5-4.0. I first tried this in 4.5 and your code worked as written, but when I converted the project to 4.0, I could reproduce the issue. After doing some searching, I found:
WPF Textbox refuses to update itself while binded to a view model property, which details a workaround that references:

angular - passing ngmodel bound to an element to a function bound to another element

Tag : javascript , By : Mike
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I have a requirement of passing a value entered in an input[type="text"] element to a function calculate() which is bound to another element. So, whenever the value in the input field changes, the calculated values should reflect in the Result. , I have achieved this using $watch().
$scope.$watch('player', function(newVal, oldVal) { 

Updating one element of a bound Observable collection

Tag : chash , By : Monev
Date : March 29 2020, 07:55 AM

How to get the lower bound and upper bound of an element in a BTreeSet?

Tag : rust , By : Nigel
Date : March 29 2020, 07:55 AM
wish of those help Reading the BTreeSet documentation, I can't seem to figure out how to get the least value greater than, or greatest value less than an element from a BTreeSet in logarithmic time. ,
but what if I don't know the range
use std::collections::BTreeSet;

fn neighbors(tree: &BTreeSet<i32>, val: i32) -> (Option<&i32>, Option<&i32>) {
    use std::ops::Bound::*;

    let mut before = tree.range((Unbounded, Excluded(val)));
    let mut after = tree.range((Excluded(val), Unbounded));

    (before.next_back(), after.next())

fn main() {
    let tree: BTreeSet<_> = [1, 3, 5].iter().cloned().collect();

    let (prev, next) = neighbors(&tree, 2);

    println!("greatest less than 2: {:?}", prev);
    println!("least bigger than 2:  {:?}", next);
greatest less than 2: Some(1)
least bigger than 2:  Some(3)
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