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QUESTION
I have a WPF app, linked to a SQL-server. I am using the MVVM-light package (I do actually have Prism.Core installed, but I'm not sure if I'm using it or not.... new to MVVM).
There's a DataGrid, bound to an ObservableCollection.
I have been trying to implement the PropertyChangedEventHandler, but I can't seem to get it to work.
I have a Delete button bound, and I am able to remove rows, but when I re-open the form, the changes does not carry over.
I tried to change the binding-mode for the DataGrid from OneWay to TwoWay. With OneWay, the changes does not carry over when I re-open the form. With TwoWay, I get this error message when opening the child form (which contains the DataGrid):
System.InvalidOperationException: 'A TwoWay or OneWayToSource binding cannot work on the read->only property 'licenseHolders' of type 'Ridel.Hub.ViewModel.LicenseHoldersViewModel'.'
So, If I then add a set; to my public ObservableCollection licenseHolders { get; },
the program runs, but the previous problem persists, like it did when there was a OneWay mode configuration on the DataGrid.
What do I need to do to get this to work without communicating directly with the Sql-server, which would defy the whole point of using this methodology in the first place?
ANSWER
Answered 2021-Jun-15 at 13:26You are confusing topics. The VM needs InotifyPropertyChanged events, which you have but are not using, to notify the Xaml in the front-end that a VMs property has changed and to bind to the new data reference.
This is needed for Lists or ObservableCollections. Once that is done, the ObservableCollection will then send notifications on changes to the list as items are added or removed.
Because you miss the first step:
QUESTION
I want to import all files from one directory to my sql. But I have to make the same changes to each original .htb file first. The problem with the original file is that
I don't want to import the column headers and the 2nd line because its blank
I need to change \t\t\t\n to only \n so MySQL knows where fields and lines end
I need to remove -----\n because it only has 1 column which doesn't match my tabe (4 columns) Here's how the original .htb file looks like:
Beschreibung\t Kurzbeschreibung\t Einheit\t Wert\t\t\t\n
\n
Hub\t Hub\t mm\t 150.000000000000\t\t\t\n
Bohrung\t Bohru\t mm\t 135.000000000000\t\t\t\n
-----\n
so far I have managed to create a list of all files. My next step would be to write that list to 1 single file which I can then edit. The problem I have is that I get a format issue when I save the list do a file. I want the final file to have utf8 format. this is what I want my file to look like:
...ANSWER
Answered 2021-Apr-13 at 10:47pickle produces a binary format, which includes per field "header" bytes (describing type, length, and for some pickle protocols, framing data) that are going to look like garbage text if you view the output as text. You can't say "I want it to be pickle, but not have these bytes" because those bytes are part of the pickle serialization format. If you don't want those bytes, you need to choose a different serialization format (presumably using a custom serializer that matches this HTB format). This has nothing to do with UTF-8 encoding or lack thereof (your input is ASCII), the problem is that you are demanding a result that's literally impossible within the limits of your design.
QUESTION
I have two grid setup's
Local grid setup (hub and nodes are running in my local machine) and my
local machineconnected tonetwork#1VM grid setup (hub and nodes are running in my virtual machine) and my
virtual machineconnected tonetwork#2
When I execute the scripts I need to pass the IP address as a parameter. Here,
I can run my scripts successfully in local machine(code is available in local machine) by passing the network#1 IP address but if I pass the network#2 IP address (VM IP address) to local machine then I am getting below exception,
org.openqa.selenium.remote.UnreachableBrowserException: Could not start a new session. Possible causes are invalid address of the remote server or browser start-up failure.
As per my knowledge, hub and nodes should be connected to same network. Cannot we run the scripts by passing the VM IP address to local machine?
Trace:
...ANSWER
Answered 2021-Jun-15 at 13:57Yes, the exception occurred due to firewall. The ping test is successful from local machine to VM but not from VM to local. I contacted the organization network administrator to confirmed this.
QUESTION
I'm writing an app in WPF, trying to use the MVVM-design pattern (which is new to me).
I have a DataGrid bound to an ObservableCollection.
Delete the currently selected DataGrid-row using a 'Delete'-button. I've tried a plethora of forum-posts and videos to find a solution. The solution has probably stared me right in the face several times, but at this point I'm more confused than I was when I first started.
Any assistance would be appreciated.
ViewModel (updated with working code, thanks to EldHasp):
...ANSWER
Answered 2021-Jun-14 at 20:15You can use Prism. Intall package Prism.Core then Install-Package Microsoft.Xaml.Behaviors.Wpf -Version 1.1.31 packages in your project, in your xaml declare namespace as - xmlns:i="http://schemas.microsoft.com/xaml/behaviors"
QUESTION
We are using stream ingestion from Event Hubs to Azure Data Explorer. The Documentation states the following:
The streaming ingestion operation completes in under 10 seconds, and your data is immediately available for query after completion.
I am also aware of the limitations such as
Streaming ingestion performance and capacity scales with increased VM and cluster sizes. The number of concurrent ingestion requests is limited to six per core. For example, for 16 core SKUs, such as D14 and L16, the maximal supported load is 96 concurrent ingestion requests. For two core SKUs, such as D11, the maximal supported load is 12 concurrent ingestion requests.
But we are currently experiencing ingestion latency of 5 minutes (as shown on the Azure Metrics) and see that data is actually available for quering 10 minutes after ingestion.
Our Dev Environment is the cheapest SKU Dev(No SLA)_Standard_D11_v2 but given that we only ingest ~5000 Events per day (per metric "Events Received") in this environment this latency is very high and not usable in the streaming scenario where we need to have the data available < 1 minute for queries.
Is this the latency we have to expect from the Dev Environment or are the any tweaks we can apply in order to achieve lower latency also in those environments? How will latency behave with a production environment loke Standard_D12_v2? Do we have to expect those high numbers there as well or is there a fundamental difference in behavior between Dev/test and Production Environments in this concern?
...ANSWER
Answered 2021-Jun-15 at 08:34Did you follow the two steps needed to enable the streaming ingestion for the specific table, i.e. enabling streaming ingestion on the cluster and on the table?
In general, this is not expected, the Dev/Test cluster should exhibit the same behavior as the production cluster with the expected limitations around the size and scale of the operations, if you test it with a few events and see the same latency it means that something is wrong.
If you did follow these steps, and it still does not work please open a support ticket.
QUESTION
I am learning kubernetes and got into a point where I am very confused. I have installed metallb and ingress-nginx so it is possible to access content from outside. I saw several examples that are using nginx image running in pod despite they are also using ingress-nginx.
Isn't ingress-nginx capable to do all work as nginx image? Otherwise what roles those two play?
I need to deploy express server where I would like to utilize some nginx features like gzip so it is where reverse proxy comes.
So do I need to make it work on ingress-nginx level or from nginx image? And if I need nginx image does it mean that I need to run separately nginx image and my built node image with my express app?
...ANSWER
Answered 2021-Jun-14 at 12:34Short answer: No
But it's complicated.
nginx image you mentioned is one of the most popular images (5th on the Docker Hub, by the time of this writing), is relatively small (133MB), and is easy to remember. That's why it is widely used as an example in many tutorials.
Isn't ingress-nginx capable to do all work as nginx image?
To some extent.
Pod and Ingress are different Kubernetes resources, and they act differently. nginx image is usually deployed as a container inside a pod.
In case of nginx ingress controller, similiar image is used for both Pod and Ingress (mentioned below).
Whenever you deploy (for example) a rewrite rule in ingress controller
QUESTION
I am trying to get my robot to communicate with my PC via sockets by using local IP addresses on my own home network (not devices outside my network). The robot is acting as the server and my own PC is acting as the client/host. I don't really know what ports are open on my robot but I do definitely know that port 22 on the robot is open (which is the SSH port). The robot is a lego EV3 robot apart from it has had some ev3python software put onto it. When I run my program I am getting the following error on the server (my robot):
...ANSWER
Answered 2021-Jun-14 at 12:24hostIPAddress = "xx.xx.xx.xx" #the local IP address of my PC on my home network
backlog = 1
size = 1024
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((hostIPAddress,22))#22 is the port number I am using. (THIS IS ALSO THE LINE WHERE THE ERROR IS COMING FROM)
s.listen(backlog)
QUESTION
I have a spring web project, with a controller for editing customer details.
...ANSWER
Answered 2021-Jun-14 at 10:13The ajax calls normally are suitable for handing responses like JSON, XML than views.
So, If you change your controller to @RestContoller from @Controller, this should work.
QUESTION
Hi I am trying to create chat app using xamarin app, .net core api and signalR.
I need to get id of curent user inside of SignalR chatHub.
I tried to get HttpContext by using IHttpContextAccessor but SignalR doesn't support it.
I tried to get HttpContext by Context.GetHttpContext() but it only returns empty Context
(as far as i understand to get current HttpContext with Context.GetHttpContext() project either has to be website or i need to place [Authentication] on my ChatHub )
I am using basic authentication on my project and i don't know how to pass user credentials to SignalR hub
Here is code from Xamarin project ChatViewModel which i use to create
new connection to Signalr hub(connection without authentication part works fine)
I don't know how to get curent users email and password instead of "email@hotmail.com" and "123"
ANSWER
Answered 2021-Jun-14 at 00:14_hubConnection = new HubConnectionBuilder()
//.WithUrl($"{APIService._apiUrl}/chatt")
.WithUrl(con, options=> options.Headers.Add("Authorization",$"Basic{credential}"))
.Build();
QUESTION
I am using this image which has bash v4.3.48 and curl v7.56.1:
https://hub.docker.com/r/bizongroup/alpine-curl-bash/tags?page=1&ordering=last_updated
Inside the docker I write the following script:
...ANSWER
Answered 2021-Jun-13 at 13:32That lies within the differences between bash and sh:
sh is POSIX compliant, whereas bash isn't (fully).
As a best practice you should always include a shebang:
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