nameof

In C# 6.0 you can write this: var instance = default(object); var type = typeof(object); They have the same result of: var instance = default(System.Object); var type = typeof(System.Object); But you can't write this: var name = nameof(object); It generates the following error: Invalid expression term 'object'. But you can still write this: var name = nameof(System.Object); Why nameof(object) does not compile? The difference is that object is a synonym for the class Object and nameof() doesn't work on synonyms. Same applies to nameof(int) vs nameof(Int32) 来源： https://stackoverflow.com

This question already has an answer here: Variable name as a string in Javascript 14 answers Let's assume we have the following code: const myVariable = { age: 7, name: "Hunter" }; I want to know the name of the variable, not just the value of it, and put it in a string or log it or: const s = nameof(myVariable) + ': ' + JSON.stringify(myVariable); And the result I want to see is sth like: "myVariable: {"age":7,"name":"Hunter"}" Looking forward to see your solution. This is my own answer in Q&A style which comes with a bit of a compromise. The trick is here to pass the parameter to the

I want to use the nameof operator in my C# project in Visual Studio 2015 but the compiler complains with the following message. Feature 'nameof operator' is not available in C# 5. Please use language version 6 or greater. I want to know how I can change the C# language version from Visual Studio 2015. Try this.. Project -> Properties -> Build -> Advanced -> Language Version Go to Project → Properties → Build → Advanced → Language Version → OK as shown with detail steps and screen shots below: Follow these steps to change the language version of your project 1: Open your project with Visual

"nameof" expression is introduced in Visual Studio 2015 and c# 6 nameof (C# and Visual Basic Reference) How can u use it or write a similar method in older versions like .net framework 4. If you're talking about an equivalent for C# before C#6, this will get the job done (in a hacky way) for properties. It can probably be expanded upon to include fields, methods, etc. public static class TestExtension { public static String nameof<T, TT>(this T obj, Expression<Func<T, TT>> propertyAccessor) { if (propertyAccessor.Body.NodeType == ExpressionType.MemberAccess) { var memberExpression =

Version 6.0 got a new feature of nameof , but I can't understand the purpose of it, as it just takes the variable name and changes it to a string on compilation. I thought it might have some purpose when using <T> but when I try to nameof(T) it just prints me a T instead of the used type. Any idea on the purpose? What about cases where you want to reuse the name of a property, for example when throwing exception based on a property name, or handling a PropertyChanged event. There are numerous cases where you would want to have the name of the property. Take this example: switch (e.PropertyName