C# Archives - Page 3 of 143

C#, Programming

IT Nursery

Select N random elements from a List in C#

I need a quick algorithm to select 5 random elements from a generic list. For example, I’d like to get 5 random elements ...

June 3, 2022
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C#, Programming

IT Nursery

How to convert a String to its equivalent LINQ Expression Tree?

This is a simplified version of the original problem. I have a class called Person: public class Person { public string Name { ...

June 3, 2022
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C#, Programming

IT Nursery

Are static class instances unique to a request or a server in ASP.NET?

On an ASP.NET website, are static classes unique to each web request, or are they instantiated whenever needed and GCed whenever the GC ...

June 3, 2022
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C#, Programming

IT Nursery

Return all enumerables with yield return at once; without looping through

I have the following function to get validation errors for a card. My question relates to dealing with GetErrors. Both methods have the ...

June 3, 2022
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C#, Programming

IT Nursery

?? Coalesce for empty string?

Something I find myself doing more and more is checking a string for empty (as in "" or null) and a conditional operator. ...

June 3, 2022
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C#, Programming

IT Nursery

Is it possible to await an event instead of another async method?

In my C#/XAML metro app, there’s a button which kicks off a long-running process. So, as recommended, I’m using async/await to make sure ...

June 3, 2022
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C#, Programming

IT Nursery

How to use WPF Background Worker

In my application I need to perform a series of initialization steps, these take 7-8 seconds to complete during which my UI becomes ...

June 3, 2022
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C#, Programming

IT Nursery

How do I suspend painting for a control and its children?

I have a control which I have to make large modifications to. I’d like to completely prevent it from redrawing while I do ...

June 3, 2022
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C#, Programming

IT Nursery

C# Double – ToString() formatting with two decimal places but no rounding

How do I format a Double to a String in C# so as to have only two decimal places? If I use String.Format("{0:0.00}%", ...

June 3, 2022
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C#, Programming

IT Nursery

Setting unique Constraint with fluent API?

I’m trying to build an EF Entity with Code First, and an EntityTypeConfiguration using fluent API. creating primary keys is easy but not ...

June 3, 2022
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