In c what does where T class mean

Question

In C  what does where T   class mean    Ie    public IList lt T gt  DoThis lt T gt    where T   class

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It is a generic type constraint  In this case it means that the generic type T has to be a reference type  class  interface  delegate  or array type

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Here T refers to a Class It can be a reference type

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it means that the type used as T when the generic method is used must be a class - i e  it cannot be a struct or built in number like int or double     Valid  var myStringList   DoThis lt string gt        Invalid - compile error var myIntList   DoThis lt int gt

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Simply put this is constraining the generic parameter to a class  or more specifically a reference type which could be a class  interface  delegate  or array type      See this MSDN article for further details

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That restricts T to reference types  You won t be able to put value types  structs and primitive types except string  there

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It is called a type parameter constraint  Effectively it constraints what type T can be      The type argument must be a reference   type  this applies also to any class    interface  delegate  or array type    Constraints on Type Parameters  C  Programming Guide

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T  represents a generic type  It means it can accept any type of class  The following article might help   http   www 15seconds com issue 031024 htm

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where T  class  literally means that T has to be a class  It can be any reference type  Now whenever any code calls your DoThis lt T gt    method it must provide a class to replace T  For example if I were to call your DoThis lt T gt    method then I will have to call it like following   DoThis lt MyClass gt       If your metthod is like like the following   public IList lt T gt  DoThis lt T gt    where T   class      T variablename   new T           other uses of T as a type      Then where ever T appears in your method  it will be replaced by MyClass  So the final method that the compiler calls   will look like the following   public IList lt MyClass gt  DoThis lt MyClass gt          MyClass variablename  new MyClass         other uses of MyClass as a type       all occurences of T will similarly be replace by MyClass

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It s a type constraint on T  specifying that it must be a class   The where clause can be used to specify other type constraints  e g    where T   struct    T must be a struct where T   new       T must have a default parameterless constructor where T   IComparable    T must implement the IComparable interface   For more information  check out MSDN s page on the where clause  or generic parameter constraints

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T represents an object type of  it implies that you can give any type of  IList   if IList s new IList  Now s add  Always accept string

[c#] In c# what does 'where T : class' mean?

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