Recent questions tagged .NET

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.net - How to list available instances of SQL Servers using SMO in C#?

Can anybody explain me what I wrong I am doing in the following piece of code: DataTable dt=SmoApplication. ... that can not be connected. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - How to insert a very large number of records into a MySql database as fast as possible

I have a database table like below: create table temperature (id int unsigned not null auto_increment primary key, ... minute in my computer.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - Why does C#/CLR not support method override co/contra-variance?

There are quite a few questions & answers about hacking around the limitation of C# not allowing method return ( ... which Java supports, IIRC) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - Do I need to dispose of a Task?

I am having fun working with System.Threading.Tasks. Many of the code samples I see, however, look ... like playing Russian Roulette.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - ActiveX, installation doesn't work

I want to create and deploy an ActiveX plugin, somethign really small. I just want to display a message box. I' ... which runs the msi) here. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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247 views

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.net - Analyze colors of an Image

I have part of an Image cropped out, and 2 Color Ranges (H/S/L) defined via 12 trackbars. I also have ... End If Next crop.UnlockBits(bdata) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - Read random line from a file? c#

I have a text file with few hundred lines, the structure is pretty simple. firstname lastname I need to pick out ... & listname from the file. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - Changing the type of an (Entity Framework) entity that is part of an inheritance hierarchy

I have an inheritance hierarchy with a base Employee entity and some descendent entities for specific employee types. ... using EF calls though. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net core - Azure Function gives error: System.Drawing is not supported on this platform

(If this question is poorly worded, could someone please help me clear it up?) I have an Azure Function (2.0) ... .0-beta2) if that's relevant. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - How Type.GetType works when given partially qualified type name?

In numerous places do I encounter partially qualified type names of the form FullTypeName, AssemblyName, i.e. like Type. ... "); Thanks a lot. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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522 views

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.net - Table name and table field on SqlParameter C#?

I would like to know how to pass the table name and a table field name via SqlCommand on C#. Tryied to do it ... but didn't work. Any ideas?? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - How to get the logon SID in C#

How does one retrieve the Windows Logon SID in C# .net? (not the user SID, but the unique new one for each session) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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630 views

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.net - Calling a webservice that uses ISO-8859-1 encoding from WCF

I am trying to call a webservice using WCF that uses the following encoding: <?xml version="1.0" encoding="ISO-8859 ... is not UTF-8 using wcf? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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454 views

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.net - Can the DebuggerDisplay attribute be applied to types one doesn't own?

I like the DebuggerDisplay attribute. I like it so much, that I want to use it on types that I don't have the source code for. Is this possible? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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346 views

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.net - Going fullscreen on secondary monitor

How can you program a dotNet Windows (or WPF) Application in order to let it going fullscreen on the secondary monitor? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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337 views

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.net - C# Generic Type Inference With Multiple Types

I have the following generic method for serialising an input object of one type as a super-type as follows: ... = SerialiseAs<MySuperType>(x); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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297 views

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.net - C# Covariance on subclass return types

Does anyone know why covariant return types are not supported in C#? Even when attempting to use an interface, ... } Thanks for any responses. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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297 views

1 answer

.net - Data Access Layer design patterns

I have to design a Data Access Layer with .NET that probably will use more than one database management system ... access layer. Thank you. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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363 views

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.net - Regex that matches a newline ( ) in C#

OK, this one is driving me nuts.... I have a string that is formed thus: var newContent = string. ... ") returns : (messageTwo) messageThree See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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321 views

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.net - C# controlling a transaction across multiple databases

Say I'm having a Windows Form application which connected to n databases, with n connections opened simultaneously. ... would be rolled back. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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503 views

1 answer

.net - Lazy loading WPF tab content

My WPF application is organized as a TabControl with each tab containing a different screen. One TabItem is bound to ... How can I do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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330 views

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.net - When is using the C# ref keyword ever a good idea?

The more I see ref used in production code, the more misuse I encounter and the more pain it causes me. I have ... like to know what they are. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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310 views

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.net - Get List<> element position in c# using LINQ

I have a List with numbers, and I'd like to find the position of the minimum (not value) using LINQ Example: ... is at position 2 in the list. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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356 views

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.net - Does End Using close an open SQL Connection

If I wrap a SQLConnection in a Using, should I close it or does the end using handle it? using cn as new system ... 'Do I need this? end using See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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294 views

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.net - Convert string to Color in C#

I am encountering a problem which is how do I convert input strings like "RED" to the actual Color type Color ... t think that is clever enough. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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465 views

1 answer

.net - Detecting when a SerialPort gets disconnected

I have an open SerialPort and receive data through the DataReceived event. Is there any way to detect if ... true when physically disconnected. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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283 views

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.net - Why is some sql query much slower when used with SqlCommand?

I have a stored procedure that executes much faster from Sql Server Management Studio (2 seconds) than when run with ... some things up...) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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398 views

1 answer

.net - How does StringBuilder work internally in C#?

How does StringBuilder work? What does it do internally? Does it use unsafe code? And why is it so fast (compared to the + operator)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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