It is used when/if you use the dynamic keyword in your project. The assembly contains the C# runtime binder. The C# compiler has essentially been extracted out into a library so that it can emit, compile and run code needed to support the dynamic keyword. The first time you use dynamic in your code, this … Read more
// Contravariance interface IGobbler<in T> { void gobble(T t); } // Since a QuadrupedGobbler can gobble any four-footed // creature, it is OK to treat it as a donkey gobbler. IGobbler<Donkey> dg = new QuadrupedGobbler(); dg.gobble(MyDonkey()); // Covariance interface ISpewer<out T> { T spew(); } // A MouseSpewer obviously spews rodents (all mice are // … Read more
Solution You can use new Guid() instead public void Problem(Guid optional = new Guid()) { // when called without parameters this will be true var guidIsEmpty = optional == Guid.Empty; } You can also use default(Guid) default(Guid) also will work exactly as new Guid(). Because Guid is a value type not reference type, so, default(Guid) … Read more
Take a look at new Constraint public class MyClass<T> where T : new() { protected T GetObject() { return new T(); } } T could be a class that does not have a default constructor: in this case new T() would be an invalid statement. The new() constraint says that T must have a default … Read more
Yes you can run HttpListener in non-admin mode. All you need to do is grant permissions to the particular URL. e.g. netsh http add urlacl url=http://+:80/MyUri user=DOMAIN\user Documentation is here.
No. A workaround is to overload with another method that doesn’t have out / ref parameters, and which just calls your current method. public bool SomeMethod(out string input) { … } // new overload public bool SomeMethod() { string temp; return SomeMethod(out temp); } If you have C# 7.0, you can simplify: // new overload … Read more
The dynamic keyword was added, together with many other new features of C# 4.0, to make it simpler to talk to code that lives in or comes from other runtimes, that has different APIs. Take an example. If you have a COM object, like the Word.Application object, and want to open a document, the method … Read more
The first is a much better option. Parallel.ForEach, internally, uses a Partitioner<T> to distribute your collection into work items. It will not do one task per item, but rather batch this to lower the overhead involved. The second option will schedule a single Task per item in your collection. While the results will be (nearly) … Read more
dynamic x = new ExpandoObject(); x.NewProp = string.Empty; Alternatively: var x = new ExpandoObject() as IDictionary<string, Object>; x.Add(“NewProp”, string.Empty);
In C# 7.0 (Visual Studio 2017) there is a new construction to do that: (string first, string middle, string last) LookupName(long id)