Recent questions tagged C#

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c# - Using a Scoped service in a Singleton in an Asp.Net Core app

In my Asp.Net Core App I need a singleton service that I can reuse for the lifetime of the application. To ... configParam { 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# - how to filter and sum using linq

what is the best LINQ approach for with no performance loss? how could we do the same thing using LINQ iterating the ... += emp.income; } } See Question&Answers more detail:os...

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

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677 views

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c# - Detect if another process is started as "Run as Administrator"

Our application needs to communicate with another program through a COM interface. The interface will not work if the other ... or VB.NET). TIA 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# - Should I use set once variables?

Does this smell? I have a few properties you can only set once. They can be set at any time during ... to create already melted objects. 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# - Connect to open LDAP over ssl

I am working on a website which is used to reset password of LDAP users. I am not able to make connection with ... let me know what is wrong. See Question&Answers more detail:os...

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

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536 views

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c# - Invalid attempt to Read when reader is closed

I have a common database class for my application and in that class i have a function public MySqlDataReader ... in all the application pages 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# - Unrecognized escape sequence

VS 2005 WinXP I am writing an application that will connect to a samba share. However, in my path I am getting ... I think that is my problem. 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# - Setting Date format in dropdown list

I am retrieving date values from dataset(_dsst) and populating them in dropdown list(drpStartYear). Since I am ... }"; drpStartYear.DataBind(); 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 prevent out-of-range datetime value error?

I am passing an ad-hoc Insert statement from c# application to the sql server 2000/2005. Sometimes, if ... Regional Date Time settings.? 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# - Listening for an Ethernet Cable Unplugging Event for a TCP Server Application

I have a C# TCP server application. I detect disconnections of TCP clients when they disconnect from server but ... 't detect the disconnection. See Question&Answers more detail:os...

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

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383 views

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c# - forcing xslt to use version 2 with xslCompiledTransform

I have following xslt , I need to use xslt version 2.0 functions like 'format-date'. How do I declare the ... </msxsl:script> </xsl:stylesheet> See Question&Answers more detail:os...

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

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896 views

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c# - EF Core 3: Configure backing field of navigation property

Consider the following class. It tries to protect the access to the _assignedTrays. Actually, it works perfectly, since ... ? Shouldn't it work? 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# - Event Inheritance with C#8 Default Interface Implementation/Traits

There is currently little documentation surrounding the limitations of events with the new C#8 default interface ... the proper syntax? 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# - .NET Core - Using system.diagnostics in App.config

I'm migrating a console app from .NET Legacy to .NET Core 2.2. In that app, I'm using the HttpClient ... the raw web requests again? 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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654 views

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c# - Using GetLineStartPosition to get the end of a line in WPF RichTextBox

A bit of background. I would like to be able to process text for the line that the caret is on in a WPF ... . Thanks in advance for any help. See Question&Answers more detail:os...

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

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845 views

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c# - Inaccessible due to its protection level?

I'm still quite new to coding in general, and while this simple program is only meant to be a test ... own understanding. All help appreciated! See Question&Answers more detail:os...

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

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659 views

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c# - How to run an "empty" Windows Application that only has a NotifyIcon?

I want to make an Application that only has a NotifyIcon. It doesn't need to have at all a "Main" Form ... will run a different command). 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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556 views

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c# - Transform string to title case

I need to convert to title case the following: First word in a phrase; Other words, in the same phrase, ... all this together Thank You, Miguel See Question&Answers more detail:os...

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

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612 views

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c# - Why var used in foreach for XmlNode does not deduce real type, only object?

Let cls be of type XmlNode Following statement allows me to access child nodes: foreach (XmlNode child in cls. ... 'NodeType Why is this? See Question&Answers more detail:os...

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

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568 views

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c# - “This project requires a Visual Studio update to load” error when creating a Xamarin.Forms Cross-Platform Application

When I create a Xamarin.Forms application using Visual Studio Community 2015 Community on Windows 8.1 it shows ... option in Solution Explorer. See Question&Answers more detail:os...

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

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520 views

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c# - ASP.NET MVC 2 Issue - Dot in Route

I'm blanking and need a quick hand. Google has failed me. I'm working on replacing WCF/REST ... relaxedUrlToFileSystemMapping="true" /> See Question&Answers more detail:os...

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

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482 views

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c# - Why can the 'as' operator not be used to parse non-nullable value types?

Every Developer has his/her own standards. Some developers like to <type>.TryParse(), some developers like to cast ... to perform in this way? See Question&Answers more detail:os...

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

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427 views

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c# - How to override MeasureOverride to find the size of ItemsControl

I am developing a UserControl that consists of a block with a heading and a list of items (as ItemsControl). The ... idea on how to fix this? See Question&Answers more detail:os...

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

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692 views

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c# - Escape double quotes in SQL 2005/2008

I have an international company that has recently been added, which is named "BLA "BLAHBLAH" Ltd. (The double ... ORDER BY c.companyName ASC See Question&Answers more detail:os...

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

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430 views

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c# - How to populate DataTable with anonymous LINQ result

I have the following LINQ query: var timesheets = from timesheet in entities.Timesheets join timesheetTask in entities. ... = dbo.Timesheet.Id See Question&Answers more detail:os...

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

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1.0k views

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c# - ApplicationHost.xdt in Azure Web Apps

How to change applicationHost.config in an Azure web app? I try: using (ServerManager serverManager = new ... due to insufficient permissions See Question&Answers more detail:os...

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

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398 views

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c# - How avoid exception deserializing an invalid enum item?

For simplicity purposes here, I will show my sample code using fruit. In actuality I am doing something more ... still gets de-serialized. See Question&Answers more detail:os...

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

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716 views

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c# - How to check if implicit or explicit cast exists?

I have a generic class and I want to enforce that instances of the type parameter are always "cast-able" ... Ts to implement IConvertibleFrom<>. See Question&Answers more detail:os...

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

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