You can work around this very easily by changing your signature. void Foo(TimeSpan? span = null) { if (span == null) { span = TimeSpan.FromSeconds(2); } … } I should elaborate – the reason those expressions in your example are not compile-time constants is because at compile time, the compiler can’t simply execute TimeSpan.FromSeconds(2.0) and … Read more
According to Microsoft Docs, since .NET 4.5 The following instance methods are thread safe (thanks @ischell): CancelPendingRequests DeleteAsync GetAsync GetByteArrayAsync GetStreamAsync GetStringAsync PostAsync PutAsync SendAsync PatchAsync
Json.NET – Newtonsoft has a JsonPropertyAttribute which allows you to specify the name of a JSON property, so your code should be: public class TeamScore { [JsonProperty(“eighty_min_score”)] public string EightyMinScore { get; set; } [JsonProperty(“home_or_away”)] public string HomeOrAway { get; set; } [JsonProperty(“score “)] public string Score { get; set; } [JsonProperty(“team_id”)] public string TeamId … Read more
You can supply the area in the routeValues parameter. Try this: return RedirectToAction(“LogIn”, “Account”, new { area = “Admin” }); Or return RedirectToAction(“LogIn”, “Account”, new { area = “” }); depending on which area you’re aiming for.
In .NET 4.5 / C# 5, you can get the compiler to do this work for you, by writing a utility method that uses the new caller attributes: using System.Runtime.CompilerServices; static void SomeMethodSomewhere() { ShowMessage(“Boo”); } … static void ShowMessage(string message, [CallerLineNumber] int lineNumber = 0, [CallerMemberName] string caller = null) { MessageBox.Show(message + ” … Read more
public static bool DoesPropertyExist(dynamic settings, string name) { if (settings is ExpandoObject) return ((IDictionary<string, object>)settings).ContainsKey(name); return settings.GetType().GetProperty(name) != null; } var settings = new {Filename = @”c:\temp\q.txt”}; Console.WriteLine(DoesPropertyExist(settings, “Filename”)); Console.WriteLine(DoesPropertyExist(settings, “Size”)); Output: True False
Basically, variance applies when the CLR can ensure that it doesn’t need to make any representational change to the values. References all look the same – so you can use an IEnumerable<string> as an IEnumerable<object> without any change in representation; the native code itself doesn’t need to know what you’re doing with the values at … Read more
By no means am I an expert in this, but I stumbled recently on what I think you want: the CoClass attribute class. [System.Runtime.InteropServices.CoClass(typeof(Test))] public interface Dummy { } A coclass supplies concrete implementation(s) of one or more interfaces. In COM, such concrete implementations can be written in any programming language that supports COM component … Read more
var result = input.GroupBy(x => x.F1, (key,g) => g.OrderBy(e => e.F2).First());
The question is “what is the difference between covariance and contravariance?” Covariance and contravariance are properties of a mapping function that associates one member of a set with another. More specifically, a mapping can be covariant or contravariant with respect to a relation on that set. Consider the following two subsets of the set of … Read more