Browsing 15901 questions and answers with Jon Skeet

Calling an async method without await in a non async method?

What is the behavior of calling an async method without the await and in a non-async method? I'm asking because I see Visual Studio not displaying any warning on the call to the...
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The fact that a method has async as a modifier is an implementation detail of the method. It just means you can write asynchronous code more easily. It doesn't change how the method is called at all. Typically an async method returns Task... more 8/29/2017 3:47:36 PM

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Parsing AM/PM time string to TimeSpan

I'm using the following to parse a time string to a TimeSpan: string[] formats = { "hhmm", "hmm", @"hh\:mm", @"h\:mm\:ss", @"h\:mm", "hh:mm tt" }; parseSuccess =...
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tt doesn't exist as one of the format specifiers for custom TimeSpan format strings. That makes sense in that TimeSpan is really meant to be a duration, not a time-of-day value - it's unfortunate that DateTime.TimeOfDay does return a... more 8/29/2017 12:21:28 PM

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Getting Wrong Date Using XMLGregorianCalender

I am trying to get the current date/time to populate in an XML. I am using the code XMLGregorianCalendar xmlDate = null; try { xmlDate =...
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Look at the arguments you're passing in to newXMLGregorianCalendar: [...].newXMLGregorianCalendar(Calendar.YEAR, Calendar.MONTH+1, Calendar.DAY_OF_MONTH, Calendar.HOUR, Calendar.MINUTE, Calendar.SECOND, ... more 8/28/2017 4:29:40 PM

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Passing "this" to base constructor

Is there any way to pass "this" to the base constructor? abstract class Base<TSelf> { public ICollection<TSelf> List; public Base(ICollection<TSelf>...
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No, you can't use this in a constructor initializer. You'd have to add call Add(this) afterwards - but you can do that in the Base<TSelf> constructor, so long as you cast to TSelf. You need to cast this to object first before casting... more 8/27/2017 8:15:46 AM

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SequenceEqual not calling Equals in parent type

A parent type: public class IdObject : IComparable<IdObject>, IEquatable<IdObject> { public int id { get; set; } public bool Equals(IdObject other) { ...
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Basically, you've got a problem because your type doesn't override object.Equals(object) in a way consistent with your IEquatable<T> implementation and you're dealing with a collection of the subclasses. SequenceEqual will be using... more 8/25/2017 12:07:24 PM

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Create library targeting .Net Framework 4.5 and .Net Standard

I have a .NET library (Products.SDK) which i need to make it compatible with both .NET Framework 4.5 and .NET Standard 1.4. (later on i will also create a NuGet package out of...
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You use option two - but only use #if in places where you really need it. The example you gave had the same code in both branches. My Noda Time project takes exactly this approach, and we've had very few problems due to that. Where... more 8/22/2017 8:03:00 AM

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why does params byte[] argument doesnt work?

i have this method from a pattern scanner public static int FindPFM(int Module,long ModuleL,int Offset,params byte[] pattern) { string mask =...
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When you invoke a method with a parameter array, the arguments go at the end, not the beginning (to match the parameter array position). Next, the arguments don't go in parentheses as you've tried to do - that's the syntax for a C# 7 tuple... more 8/19/2017 8:48:36 PM

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Dynamic Order By in Linq

I have an app that accesses database and has to order results by different fields depending on the input. Here is my function for sorting: IQueryable<Entity>...
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Well, you definitely want to use OrderByDescending instead of reversing. It's not going to be quite as brief as the SQL, but you could at least use: IQueryable<Entity> GetSortedData(IQueryable<Entity> result, String orderby,... more 8/18/2017 4:44:41 PM

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Generic functions and ref returns in C# 7.0

Is it possible to use the ref returns feature in C# 7.0 define a generic function that can do both comparison and update of a field in two instances of an Object? I am imagining...
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You need to declare your own delegate type for it. For example: using System; public class Thing { public int field1; public string field2; } public delegate ref TOutput FuncRef<TInput, TOutput>(TInput input); public... more 8/18/2017 3:46:13 PM

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Adding Count of Arrays Together returns 0

I have the following class, where the arrays are populated public class InternalTag_RelatedObjectsViewModel { public Guid[] BranchIDS { get; set; } public Guid[]...
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You're missing precedence, basically. It's easier to see what's going on when this is reduced to a minimal example: using System; public class Program { public static void Main() { string[] a = { "x", "y" }; ... more 8/18/2017 10:45:11 AM

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