C# - Страница 2236

I was trying to bind Postgresql table data in the drop-down field. I installed all the required packages. While running the instance, I got this error:

The base class includes the field 'PgSqlDataSource', but its type...

I've run into an issue in a Blazor project. When I pass in URL parameters, the @onlick events are no longer working. I'm creating .cshtml pages and populating them with Razor components.

The following code does NOT work:

@page...

I have a table called Announcement and it has unique index on columns Title and Code.

I am using Entity Framework 6.0.26 for CRUD operations, but I have an issue in inserting/updating data into the mentioned columns.

catch (Exception ex) { if...

I Have a DataGridView that's working just fine displaying data as follows:

private DataGridView dgv; private List Items = new(); Items.Add(new() {ID = 1, Service = new() { Name = Item 1 }, Quantity = 2}); dgv.DataSource = Items; // Public Class...

Net with Open xml. I have below excel to read

In the above excel starting row is row number 29. I would like to read rows till value I starting from a. Here basically I would like to find it out row number I. Logic is if next row has...

I am trying to password protect application settings (basically server address, port etc..) in a C# Windows desktop application.

During the initial run, user (actually admin) can set the application settings and password; in the normal course of...

We've encountered an issue while developing an application called 'DC Watcher' to monitor local file system changes and notify us with event . Unfortunately, it's not functioning as expected for user profile folders.

Problem: We identified that...

I have an interface that is implemented on several readonly structs that are passed around in a tight loop using the in parameter modifier. My understanding of the in keyword is that it can be used when passing readonly structs to prevent values...

Is there a way that AutoCompleteExtender of AjaxControlToolkit provide to access its response similar to ajax success function callback. Actually I am authenticating a call to webmethod. If a request is not authentic I am returning 500 from my...

Hello i have a WPF application that was running fine and well with esri version 200.0 and net version 6.0

After we upgraded to net version 8 and esri version 200.3 im getting the following exception (after calling...

I'm experimenting with the WebView2 browser and have encountered behavior I can't explain:
I have created a desktop fragment link which points to an anchor in a local html file. When I drag the link to the browser control, if the control is empty...

I am trying to implement data validation in XAML / WPF for the very first time. I have read several tutorials and there seems to be a variety of ways to do it. I have settled on one approach and it is not working.

First, this is ideally how I...

So I currently have two objects.

Object A

public class Person { public string FirstName { get; set; } public string LastName { get; set; } public Pet MyPet { get; set; } } and Object B

public class Pet { public string Name { get; set; } public...

I am implementing copy and paste in a table. The problem is that when pasting, I need to change the clipboard before pasting. I do it in the GridControl_PastingFromClipboard(object sender, PastingFromClipboardEventArgs e) method. With this approach,...

I have been reading for the 2 hours and I am still confused. Some say use StartNew, some say Task.Run some say something else. I do know that Task.Run is giving me a compile error.

I need to start multiple tasks in parallel and then when each...

Where do I find the ACTUAL code of my Forms?

You know, the stuff you set in the properties menu, where is the code for that? I can't find it! Im new to using Forms so this question is most liekely the dumbest thing you heard in the last weeks and...

After finding the reason for why the following code works the way it does in C#, I tried the near identical code in C++ and got a different result, even though their stated orders of operations and their direction of evaluation for the matching...

I have a n-ary tree structure that has nodes with children. Each node is a folder and folders can have child folders (i.e. nested folder) or simply a file (leaf node). I want to convert this structure to a list of folders where each folder name is a...

I'm creating class maps for my models but this type error keeps happening when the application tries to migrate the database. I initially thought that the problem was the absence of the shadow properties for the relationships between tables, but it...

I am using LogParser to export the SQL query into CSV - working fine.

Three of the fields from the IISW3C Log are being concatenated but need trimming.

If it was in C#, it would be a simple IF statement and trimming the field value returned by...

I have a global middleware handling the exceptions thrown by the application. It works as supposed to except for operations failing at the DB level. When I have a problem that Entity Framework reports (due to flawed config in Context definition or...

Is there any replacement (analogue) for CSS3 function repeating-linear-gradient() in .NET (WinForms, not WPF)? I need to paint repeating zebra stripes (e.g. red, blue, green, red, blue, green, ...) at an angle 45 degrees.

UPD: Following Jimi's...

There are two type of application in my solution 1)Web api application 2)MMC c# application

Here I created web api application which has facility of token authentication. In this Application username and password validating from SQL server...

I stored color hex in Color table. Now I want display the color when I add a product. Here my ProductController:

public IActionResult Create() { ViewData = new SelectList(_context.Color, IdColor , ColorHex ); Product product = new Product();...

I'm trying to build Blazor Hybrid project in Github Actions. Here is my yml file,

name: build on: push: branches: - master pull_request: branches: - master jobs: build-and-test: runs-on: windows-latest steps: # Checkout the code - uses:...