How can I get the data type of a variable in C

Question

How can I find out what data type some variable is holding   e g  int  string  char  etc    I have something like this now   using System  using System Collections Generic  using System Linq  using System Text   namespace Testing       class Program               static void Main                         Person someone   new Person                someone setName 22               int n   someone getName                Console WriteLine n typeOf                          class Person               public int name           public void setName int name                        this name   name                     public int getName                         return this name

User · Answer

GetType   method  int n 34  Console WriteLine n GetType     string name  Smome   Console WriteLine name GetType

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check out one of the simple way to do this     Read string from console         string line   Console ReadLine             int valueInt          float valueFloat          if  int TryParse line  out valueInt      Try to parse the string as an integer                       Console Write  This input is of type Integer                       else if  float TryParse line  out valueFloat                          Console Write  This input is of type Float                       else                       Console WriteLine  This input is of type string

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Generally speaking  you ll hardly ever need to do type comparisons unless you re doing something with reflection or interfaces  Nonetheless   If you know the type you want to compare it with  use the is or as operators   if  unknownObject is TypeIKnow        run code here   The as operator performs a cast that returns null if it fails rather than an exception   TypeIKnow typed   unknownObject as TypeIKnow    If you don t know the type and just want runtime type information  use the  GetType   method   Type typeInformation   unknownObject GetType      In newer versions of C   you can use the is operator to declare a variable without needing to use as   if  unknownObject is TypeIKnow knownObject         knownObject SomeMember        Previously you would have to do this   TypeIKnow knownObject  if   knownObject   unknownObject as TypeIKnow     null         knownObject SomeMember

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Its Very simple  variable GetType   Name   it will return your datatype of your variable

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One option would be to use a helper extension method like follows   public static class MyExtensions       public static System Type Type lt T gt  this T v   gt typeof T      var i 0  console WriteLine i Type   FullName

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There is an important and subtle issue that none of them addresses directly   There are two ways of considering type in C   static type and run-time type   Static type is the type of a variable in your source code   It is therefore a compile-time concept   This is the type that you see in a tooltip when you hover over a variable or property in your development environment   You can obtain static type by writing helper generic method to let type inference take care of it for you       Type GetStaticType lt T gt  T x    return typeof T       Run-time type is the type of an object in memory   It is therefore a run-time concept   This is the type returned by the GetType   method   An object s run-time type is frequently different from the static type of the variable  property  or method that holds or returns it   For example  you can have code like this   object o    Some string     The static type of the variable is object  but at run time  the type of the variable s referent is string   Therefore  the next line will print  System String  to the console   Console WriteLine o GetType        prints System String   But  if you hover over the variable o in your development environment  you ll see the type System Object  or the equivalent object keyword   You also see the same using our helper function from above   Console WriteLine GetStaticType o       prints System Object   For value-type variables  such as int  double  System Guid  you know that the run-time type will always be the same as the static type  because value types cannot serve as the base class for another type  the value type is guaranteed to be the most-derived type in its inheritance chain   This is also true for sealed reference types  if the static type is a sealed reference type  the run-time value must either be an instance of that type or null   Conversely  if the static type of the variable is an abstract type  then it is guaranteed that the static type and the runtime type will be different   To illustrate that in code      int is a value type int i   0     Prints True for any value of i Console WriteLine i GetType      typeof int        string is a sealed reference type string s    Foo      Prints True for any value of s Console WriteLine s    null    s GetType      typeof string        object is an unsealed reference type object o   new FileInfo  C   f txt       Prints False  but could be true for some values of o Console WriteLine o    null    o GetType      typeof object        FileSystemInfo is an abstract type FileSystemInfo fsi   new DirectoryInfo  C          Prints False for all non-null values of fsi Console WriteLine fsi    null    fsi GetType      typeof FileSystemInfo

User · Answer

Use the GetType   method  http   msdn microsoft com en-us library system object gettype aspx

User · Answer

Just hold cursor over member you interested in  and see tooltip - it will show memeber s type

[c#] How can I get the data type of a variable in C#?

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