Recent questions tagged C#

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c# - Is there a way to test if a variable is dynamic?

The following piece of code will always return true unless the variable v is null: v is dynamic and the ... if the variable is dynamic? See Question&Answers more detail:os...

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

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424 views

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c# - How to set Datetimepicker to Month and Year only format?

How can I set the Datetimepicker-Format to MM/YYYY? See Question&Answers more detail:os...

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

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1.2k views

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c# - How do you mock an IAsyncEnumerable?

I want to unit test a method that calls another method of a service returning an IAsyncEnumerable<T>. I have created ... ); } return results; } See Question&Answers more detail:os...

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

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551 views

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c# - Error converting value {null} to type 'System.DateTime' in input json

This JsonSerializationException was thrown when I tried to input the following DateTime parameters in my Json : " ... then please mention 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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422 views

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c# - Required query string parameter in ASP.NET Core

Using ASP.NET Core 1.1 with VS2015 (sdk 1.0.0-preview2-003131), I have the following controller: public ... , thus keeping my controller tidy. 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# - Assembly.GetExportedTypes vs GetTypes

What does Assembly.GetExportedTypes() do? How is it different from Assembly.GetTypes() Can you explain with example? 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 doesn't returning by ref work for elements of collections?

The following example of returning by reference is from What's New in C# 7.0: public ref int Find(int ... returning from a collection doesn'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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458 views

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c# - How do I suppress keypress being printed to console in .NET?

I'm porting a small C++ console game to C# and it seems that I can't stop key presses from being printed to ... Any ideas on how to remedy 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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644 views

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c# - How to create a Bitmap deep copy

I'm dealing with Bitmaps in my application and for some purposes I need to create a deep copy of the Bitmap. ... deep copy. Thanks for 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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c# - Default value on generic predicate as argument

First time question for me :) I need some way to define a default predicate using a generic on the ... my function logic accordingly? 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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504 views

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c# - Prevent XmlSerializer from formatting output

When using the default settings with the XmlSerializer it will output the XML as a formated value. IE: something ... .ToString(); } } See Question&Answers more detail:os...

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

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384 views

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c# - Why are parameter names necessary in an interface definition? I am allowed to choose new parameter names during implementation

Not sure if this is a silly question, but I just noticed this: public interface IActivityDao : IDao<Activity ... 't forced upon implementations. See Question&Answers more detail:os...

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

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450 views

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c# - Can you compare floating point values exactly to zero?

I know we can't compare 2 floating point values using ==. We can only compare they are within some interval of each ... getVal(); if(val == 0) See Question&Answers more detail:os...

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

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663 views

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c# - Why is Extension Method Not Found in MVC4 Razor View?

Given the following string extension method namespace JHS.ExtensionMethods { public static class StringExtensions { public ... figure out 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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319 views

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c# - Execute code when starting an ASP.NET MVC 4 Application

I want when my application starts, to execute some code if (!WebMatrix.WebData.WebSecurity.Initialized){ WebMatrix. ... that has this purpose? See Question&Answers more detail:os...

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

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346 views

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c# - Type or namespace cannot be found, when reference does exist

I have a wpf Application in which I am trying to reference a class library i have created. I have added a ... sure it builds with no errors. See Question&Answers more detail:os...

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

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748 views

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c# - Entity Framework Core count does not have optimal performance

I need to get the amount of records with a certain filter. Theoretically this instruction: _dbContext.People.Count ( ... criteria to the count? See Question&Answers more detail:os...

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

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404 views

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c# 3.0 - Is it possible to define a generic lambda in C#?

I have some logic in a method that operates on a specified type and I'd like to create a generic lambda that ... 3.0 doesn't support 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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323 views

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c# - Is there a .NET collection interface that prevents adding objects?

I have a class that maintains list of objects of another class. List of objects is a public property. I ... T> and then directly manipulated. See Question&Answers more detail:os...

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

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454 views

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c# - How to cancel autocomplete in Visual Studio 2015 by pressing "Space"?

How to cancel autocomplete in Visual Studio 2015 by pressing "Space"? Looks like there is no such ... -2015-cancel-intellisense-autocomple See Question&Answers more detail:os...

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

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312 views

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c# - How to check if my string only numeric

How I can check if my string only contain numbers? I don't remember. Something like isnumeric? See Question&Answers more detail:os...

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

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329 views

1 answer

c# - Programmatically using a tab character in .NET

Is there a way to use a tab character like a new line character inside the Environment class, instead of using ""? 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# - Cannot implicitly convert derived type to its base generic type

I have the following classes and interfaces: public interface IThing { string Name { get; } } public class ... attempting here? Thanks! Chris See Question&Answers more detail:os...

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

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484 views

1 answer

c# - Are there any implementations of multiset for .Net?

I'm looking for a .Net implementation of a multiset. Can anyone recommend a good one? (A multiset, or bag ... occurrences of the same product.) See Question&Answers more detail:os...

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

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512 views

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c# - Is there any way to negate a Predicate?

I want to do something like this: List<SomeClass> list1 = ... List<SomeClass> list2 = ... Predicate<SomeClass> ... there any way to 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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3.5k views

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c# - Remove double curly brackets from JObject that have been added during deserialization

I have a JSON string that starts and ends with curly brackets "{}". I then deserialize the object but ... extra curly bracket when deserialized? See Question&Answers more detail:os...

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

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574 views

1 answer

c# - Do I need to escape backslash in a config file?

I have a config file, myapp.exe.config. In the file I have an attribute with a fullpath filename as the value. ... the correct way to 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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572 views

1 answer

c# - Linq to SQL .Sum() without group ... into

I have something like this: var itemsInCart = from o in db.OrderLineItems where o.OrderId == currentOrder.OrderId ... with group ... into? See Question&Answers more detail:os...

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

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