How to compare types

Question

Quick question  how to compare a Type type  pun not intended  with another type in C   I mean  I ve a Type typeField and I want to know if it is System String  System DateTime  etc   but typeField Equals System String  doesn t work   Any clue

User · Answer

You can use for it the is operator  You can then check if object is specific type by writing   if  myObject is string      DoSomething

User · Answer

http   msdn microsoft com en-us library system type gettype aspx  Console WriteLine  typeField is a  0    typeField GetType       which would give you something like  typeField is a String  typeField is a DateTime   or  http   msdn microsoft com en-us library 58918ffs v vs 71  aspx

User · Answer

Try the following  typeField    typeof string  typeField    typeof DateTime    The typeof operator in C  will give you a Type object for the named type   Type instances are comparable with the    operator so this is a good method for comparing them    Note  If I remember correctly  there are some cases where this breaks down when the types involved are COM interfaces which are embedded into assemblies  via NoPIA    Doesn t sound like this is the case here

User · Answer

You can compare for exactly the same type using   class A     var a   new A    var typeOfa   a GetType    if  typeOfa    typeof A         typeof returns the Type object from a given class   But if you have a type B  that inherits from A  then this comparison is false  And you are looking for IsAssignableFrom   class B   A     var b   new B    var typeOfb   b GetType     if  typeOfb    typeof A        false    if  typeof A  IsAssignableFrom typeOfb        true

User · Answer

If your instance is a Type   Type typeFiled  if  typeField    typeof string                   but if your instance is an object and not a Type use the as operator   object value  string text   value as string  if  text    null           value is a string and you can do your work here     this has the advantage to convert value only once into the specified type

[c#] How to compare types

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