Recent questions tagged C#

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c# - How to convert a string containing AM/PM to DateTime?

How can i parse a string like this: "2/22/2015 9:54:02 AM" to a DateTime instance? i am currently using the ... parse the AM/PM signs as well. See Question&Answers more detail:os...

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

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391 views

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c# - How do I convert a Bitmap to byte[]?

Basically I am inserting an image using the listviews inserting event, trying to resize an image from the fileupload ... ); db.SubmitChanges(); See Question&Answers more detail:os...

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

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687 views

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c# - WPF CheckBox TwoWay Binding not working

I have <DataGridCheckBoxColumn Binding="{Binding Path=Foo, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" /> And ... state. Any Suggesitons? See Question&Answers more detail:os...

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

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932 views

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c# - OleDbConnection gets "External component has thrown an exception."

I' m using a Windows Forms application to export data to excel. Application is built both x64 and x86. So both ... "; How can I solve 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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504 views

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c# - Change Background of an MDI Form

How can I change the BACKGROUND color of the MDI FORM in C#? I changed it using the background color property but ... I do to perform this task? See Question&Answers more detail:os...

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

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566 views

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c# - Why ArrayList implement IList, ICollection, IEnumerable?

ArrayList declares that it implements the IList, ICollection, and IEnumeralbe interfaces. Why not only implement IList, ... in .NET BCL. 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 am I getting "CS0472: The result of the expression is always true since a value of type int is never equal to null of type int?"

string[] arrTopics = {"Health", "Science", "Politics"}; I have an if statement like: if (arrTopics.Count() ... saying so. Can anybody help me? See Question&Answers more detail:os...

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

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535 views

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c# - How do I remove a tooltip currently bound to a control?

I'm currently adding a tooltip to a label like so: ToolTip LabelToolTip = new System.Windows.Forms.ToolTip(); ... the text in a label? See Question&Answers more detail:os...

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

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685 views

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c# - Cannot modify struct in a list?

I want to change the money value in my list, but I always get an error message: Cannot modify the return ... AccountList[0].Money = 547885; See Question&Answers more detail:os...

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

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704 views

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c# - Why not all countries are presented in CultureInfo.GetCultures()?

I am using this standard code for populating list of countries: static void Main(string[] args) { List ... the reason of such situation? See Question&Answers more detail:os...

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

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453 views

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c# - Modifying .NET Dictionary while Enumerating through it

I'm using a Dictionary<long, bool> and I want to change it while I enumerate through it, but it seems this is not allowed. How can I do 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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543 views

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c# 4.0 - How to create a file in the AppData folder using log4net

How to create the log file in appData folder. The path is C:UsersMYNAMEAppDataRoamingProjectMy ProjectApplication. ... being Administrator. See Question&Answers more detail:os...

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

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407 views

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c# - What is the difference between warning codes cs0618 and cs0612

I have seen both of the following warning codes being thrown for utilization of code marked obsolete. cs0618 and ... instead of the other? See Question&Answers more detail:os...

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

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481 views

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c# - Strange string literal comparison

Going deeper in C#, I have encountered a little (strange) problem with object reference equality. Let says I have ... I never explicitly did a=b See Question&Answers more detail:os...

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

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679 views

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c# - InvalidOperationException - A TwoWay or OneWayToSource binding cannot work on the read-only property

I'm using the MVVM pattern and am receiving the following when i run my app InvalidOperationException A TwoWay or ... what i'm missing here? See Question&Answers more detail:os...

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

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522 views

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c# - Stack and Queue enumeration order

I know that List enumerator guarantees the enumeration order and respects last sort operation, I know that ... enumerators guarantee any order? See Question&Answers more detail:os...

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

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558 views

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c# - What is the difference between MyEnum.Item.ToString() and nameof(MyEnum.Item)?

MyEnum.Item.ToString(); nameof(MyEnum.Item); Which style is preferred? Is there any practical difference between the two? See Question&Answers more detail:os...

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

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326 views

1 answer

c# - Why we use "this" in Extension Methods?

I want to ask why we use "this" keyword before the parameter in an extension method (C# Language)........... ... use it but I don't know 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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705 views

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c# - Regular expression error message

Using the RegularExpression(@"^d{1,15}$")], I want the user to enter digits up to 15 in length, which ... '...does anyone know 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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733 views

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c# - List ForEach break

is there a way to break out of the foreach extension method? The "break" keyword doesn't recognize the ... do with the extension method. See Question&Answers more detail:os...

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

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419 views

1 answer

c# - How to get date from day of year

How can I get date from day of year in C#? I have this code : int a = 53; // This is the day of ... work, what should I do? Thanks in advance. See Question&Answers more detail:os...

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

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457 views

1 answer

c# - Get value of constant by name

I have a class with constants. I have some string, which can be same as name of one of that constants ... type ConstClass (ConstClass is static) See Question&Answers more detail:os...

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

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543 views

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c# - Object and Collection Initializers - assign self?

I'm using object and collection Initializers in the program and thinking how to get the example below. Orders.Add( ... order to the order item? See Question&Answers more detail:os...

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

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878 views

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c# - Running a .NET core app (.dll) with cmd by using process.start

I'm new to .NET Core 2.0, so i might be doing this all wrong, if so let me know. I have a ... NET core process able to duplicate itself? 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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514 views

1 answer

c# - Microsoft.AspNetCore.Antiforgery was not found

I'm deploying a asp.net core 2.0 website to IIS 10. I've made sure that my app is using the correct ... I get a 502.5 error message. See Question&Answers more detail:os...

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

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555 views

1 answer

c# - How come CenterToScreen method centers the form on the screen where the cursor is, not the screen with the focused app?

I am using Visual Studio 2010, C# .NET 4, WinForms. My PC has 2 monitors. When I call the CenterToScreen method ... is on. Does anyone know 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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345 views

1 answer

c# - Using Linq to find the element after a specified element in a collection

I have an ordered list of People. I have a person that I know exists in that collection. How can I determine which person is next in the list? See Question&Answers more detail:os...

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

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531 views

1 answer

c# - Styling WPF ComboBox items

I have a very simple WPF application which displays a ComboBox which binds to a list of classes which represent ... } Many thanks in advance See Question&Answers more detail:os...

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

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