Is StringBuilder class Value type?
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From: sameem on 18 Jul 2008 02:59 Dear All up to my level that I have known the StringBuilder class is reference type. Someone telling that StringBuilder class is Value type. Hence I want to clarify which is right? and how? Regards Sam
From: Frans Bouma [C# MVP] on 18 Jul 2008 04:08 sameem wrote: > Dear All > > up to my level that I have known the StringBuilder class is reference type. > Someone telling that StringBuilder class is Value type. > > Hence I want to clarify which is right? and how? It's a reference type. String is also a reference type (though it behaves like a valuetype). To determine if a type is a valuetype or a reference type, you can look into the MSDN, lookup the type's documentation page, and you can see if it inherits from a class (except when it inherits from System.ValueType) or it is a class itself -> reference type, if it is a struct (e.g. Int32) or if it inherits from System.ValueType, it is a value type. A struct automatically inherits from System.ValueType, see reflector on System.Int32 for example. In general, a type which is mutable is likely to be a reference type, or at least should be a reference type, according to MS guidelines. So first thing to check: documentation. FB -- ------------------------------------------------------------------------ Lead developer of LLBLGen Pro, the productive O/R mapper for .NET LLBLGen Pro website: http://www.llblgen.com My .NET blog: http://weblogs.asp.net/fbouma Microsoft MVP (C#) ------------------------------------------------------------------------
From: sameem on 18 Jul 2008 06:08
Thanks a lot. "Frans Bouma [C# MVP]" wrote: > sameem wrote: > > Dear All > > > > up to my level that I have known the StringBuilder class is reference type. > > Someone telling that StringBuilder class is Value type. > > > > Hence I want to clarify which is right? and how? > > It's a reference type. String is also a reference type (though it > behaves like a valuetype). To determine if a type is a valuetype or a > reference type, you can look into the MSDN, lookup the type's > documentation page, and you can see if it inherits from a class (except > when it inherits from System.ValueType) or it is a class itself -> > reference type, if it is a struct (e.g. Int32) or if it inherits from > System.ValueType, it is a value type. A struct automatically inherits > from System.ValueType, see reflector on System.Int32 for example. > > In general, a type which is mutable is likely to be a reference type, > or at least should be a reference type, according to MS guidelines. > > So first thing to check: documentation. > > FB > > -- > ------------------------------------------------------------------------ > Lead developer of LLBLGen Pro, the productive O/R mapper for .NET > LLBLGen Pro website: http://www.llblgen.com > My .NET blog: http://weblogs.asp.net/fbouma > Microsoft MVP (C#) > ------------------------------------------------------------------------ > |