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Why are C# 4 optional parameters defined on interface not enforced on implementing class?

I noticed that with the optional parameters in C# 4 if you specify an optional parameter on an interface you don,t have to make that parameter optional on any implementing class: ...
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C# loop - break vs. continue

In a C# (feel free to answer for other languages) loop, what's the difference between break and continue as a means to leave the structure of the loop, and go to the next iteration? ...
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C# elegant way to check if a property's property is null

In C#, say that you want to pull a value off of PropertyC in this example and ObjectA, PropertyA and PropertyB can all be null. ...
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Catch multiple exceptions at once?

... EDIT: I do concur with others who are saying that, as of C# 6.0, exception filters are now a perfectly fine way to go: catch (Exception ex) when (ex is ... || ex is ... ) Except that I still kind of hate the one-long-line layout and would personally lay the code out like the follo...
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How to import JsonConvert in C# application?

I created a C# library project. The project has this line in one class: 9 Answers 9 ...
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How do arrays in C# partially implement IList?

So as you may know, arrays in C# implement IList<T> , among other interfaces. Somehow though, they do this without publicly implementing the Count property of IList<T> ! Arrays have only a Length property. ...
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What are 'closures' in .NET?

...has finished executing. The general feature of closures is implemented in C# by anonymous methods and lambda expressions. Here's an example using an anonymous method: using System; class Test { static void Main() { Action action = CreateAction(); action(); action(...
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DateTime format to SQL format using C#

I am trying to save the current date time format from C# and convert it to an SQL Server date format like so yyyy-MM-dd HH:mm:ss so I can use it for my UPDATE query. ...
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How to access property of anonymous type in C#?

...t v = p.GetValue(o, null); This answer is long overdue for an update for C# 4: dynamic d = o; object v = d.Foo; And now another alternative in C# 6: object v = o?.GetType().GetProperty("Foo")?.GetValue(o, null); Note that by using ?. we cause the resulting v to be null in three different sit...
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What static analysis tools are available for C#? [closed]

What tools are there available for static analysis against C# code? I know about FxCop and StyleCop. Are there others? I've run across NStatic before but it's been in development for what seems like forever - it's looking pretty slick from what little I've seen of it, so it would be nice if it would...