Recent questions tagged c#

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c# - EF: Incorrect usage of spatial/fulltext/hash index and explicit index order

I'm using Entity framework with my WEB Api project. I use code first migration. The thing is: After making ... every .Index() in migration file See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - How to Suggest Append ComboBox in DataGridView?

I have a ComboBox in a c# Windows forms application where I have set AutoCompleteMode to SuggestAppend, and the text is ... Fig 1 : Fig 2 : See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - DateTime.ParseExact - how to parse single- and double-digit hours with same format string?

I want to be able to parse strings of time (hours, minutes, seconds) where the hours run from 0 ... all formulations throw a FormatException. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Why does a google search through the google api return different results to a search in the web page?

I think the question pretty much sums up my query. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - WPF button in ListView can not see command in ViewModel

<StackPanel>  <ListView ... don't understand why Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Are WCF services stateless by default?

I've got a simple WCF service that lets clients/consumer applications log in by providing a username and password ... behave in that manner? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Why can't I set the asp:Label Text property by calling a method in the aspx file?

Can somebody please explain this to me: I have a label and I want to be able to set the Text property by ... contain <% ... %> constructs. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Alternative to using InStr

how can I use a different function "InStr" this is the code that I am using and works fine but moving ... (1, Hostname, Environment.Newline) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Using LINQ to merge a list of objects

I have two lists of objects, using Linq I would like to merge them, but where the two lists contain objects ... LastUpdated {get;set;} } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Validate query parameters without using a model in .netcore api

Is it possible to validate query parameters on an action without using a model? A lot of the calls in my ... from within an Action Constraint. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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390 views

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c# - How to do a Sum using Dynamic LINQ

I have the following which works brilliantly with the dynamic linq library: string where = "Price < 5"; string orderby ... "); would be nice... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Is switching app.config at runtime possible?

Is there a way at runtime to switch out an applications app.config (current.config to new.config, file for file). ... how to do this at runtime. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - How can I stop Add-Migration checking my database has no pending migrations when using Code-Based migrations?

I'm investigating using Code-Based EF Migrations for a product that does not use EF. Everything generally ... the IMigrationMetadata stuff :-) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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334 views

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c# - Entity Framework List Contains in lambda

I want to query items with specific IDs using. For example: var ids = new List<int> { 1, 3, 5 ... Entity Framework 6 with Microsoft SQL Server. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Debug.Writeline is Not printing anything

VS 2010 Pro, C#, WinForms: at the very beginning of my method I am saying Debug.Writeline("entering method blah"); ... "....did not help either. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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367 views

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c# - How to set a timeout on WMI queries?

I have a .NET application which runs WMI queries on all domain computers in order to find the logged in user; it ... I set a timeout on it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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706 views

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c# - ProtoBuf-net serializing IEnumerable<T>

I'm trying to use ProtoBuf-NET in my project (it's mostly Silverlight 4 project). I'm having difficulties serializing ... <T> : Collection<T> ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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399 views

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c# - LINQ vs foreach vs for performance test results

Could somebody explain these results? I know there are duplicate questions, but I have yet to find a single question that ... ; } } } } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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298 views

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c# - Read and Write to File at the same time

for an application that uses a File as some sort of global storage for device reservations in a firm I need a ... 2000 devices at the same time See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - How to pass parameters to an exe?

I am using psexec on my server to run an exe file on another server. How do I pass parameters to the other ... , followed by the drive path ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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466 views

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c# - Encoding with HttpClient in .NET 4.5

I'm consuming some data using the fogbugz XML API. This API always offers data as UTF-8. When using the WebClient ... ="UTF-8"?> <response> See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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370 views

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c# - MIME-Type for Excel XML (ASP.NET 3.5)

I use CarlosAG-Dll which creates a XML-Excel-file for me (inside a MemoryStream). Response.ContentType = "application ... is still open and why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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393 views

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c# - How can I stop async Process by CancellationToken?

I found beneath code for execute some process without freezing UI. This code is executed when 'Start Work' ... much for reading this question. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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300 views

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c# - iTextSharp HTMLWorker.ParseToList() throws NullReferenceException

I am using iTextSharp v.4 to merge a whole bunch of html files. It was working fine until I needed to ... > Thanks for any help. hofnarwillie See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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752 views

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c# - Entity Framework Core support for SQL Spatial Data Types - DBGeography?

I want to make a web application using ASP.NET Core Razor Pages that has some geographic data in SQL Server ... post dealing with this question. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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289 views

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c# - Updating UI with BackgroundWorker in WPF

I am currently writing a simple WPF 3.5 application that utilizes the SharePoint COM to make calls to SharePoint sites and ... = false; } )); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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433 views

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c# - Adding code to the beginning / end of methods in runtime dynamically

I know instrumentation is a technique to add trace code dynamically into the methods to enable tracing and debugging. I ... goals too, or not. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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810 views

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c# - How can I pass MemoryStream data to unmanaged C++ DLL using P/Invoke

I need your help with the following scenario: I am reading some data from hardware into a MemoryStream (C#) ... void * rawData, int dataLength) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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