how to check data type

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2.50/5 (2 votes)

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Hi,

Any one can help me how check the datatype of argument that we are passing now i am tried as

string st = Args.SortExpression.GetType();

But it wont works can u suggest me for any alternative in this...

Thanks in Advance

Seshu

Posted 15-May-11 19:54pm

hiseshu

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-05-15T20:18:00

It's "not working" as as object.GetType() does not return string; the return type is System.Type. It can work, but only if you need to use reflection seriously: for example check if the type supports certain interface, invoke type constructor to obtain instance and work with the instance using techniques which are agnostic to the type.

In more typical situation you just may need to know is the instance of the certain type (in case of class your can check if the instance is of the type belonging to some inheritance hierarchy) or perform dynamic type cast to conditionally down-case more abstract compile type to some more concrete run-time type. For these purposes, you need to use operators "is" and "as":

C#

object @object;

//...

@object = new //who knows what

if (@object is string) { //good check
    string @string = (string)@object); //correct, but not so good, see how to use "as" below
    //use value
}

string @string = @object as string; //however, this works only for nullable types
if (@string != null)
   //use @string;

Note: "@object" and "@string" in C# syntax are normal valid variable identifiers, "@" is just the way to create identifiers identical to language keywords.

—SA

anshudutta · Answer 2 · 2011-05-15T20:50:00

Solution 5

use the GetType() and Typeof() to evaluate.

if object.getType== typeOf(System.Object)....

Posted 15-May-11 20:50pm

anshudutta

parmar_punit · Answer 3 · 2011-05-15T21:10:00

MIDL

if (Args.GetType() == Type.GetType(System.String))
{
      //Args is string
}
// you can get the Type of the object as a string by - Args.GetType.Name
string st = Args.GetType().Name;
if(st == "String")
{
     //Do something with string value
}
if(st == "Int32")
{
     // Do something with Interger value
}
if(st == "Single")
{
     // Do something with Float value
}
if(st == "Double")
{
     // Do something with Double value
}
//Or you can use Swith() case statements.....

nit_singh · Answer 4 · 2011-05-15T22:24:00

Solution 7

Try that way

dgvMappedData.Columns.Cast<DataGridViewColumn>().ToList().Find(dc=>dc.Name == Args.SortExpression).ValueType

Posted 15-May-11 22:24pm

nit_singh

walterhevedeich · Answer 5 · 2011-05-15T20:12:00

Solution 1

Try this.

string st = Args.SortExpression.GetType().ToString();

Posted 15-May-11 20:12pm

walterhevedeich

Comments

hiseshu 16-May-11 2:34am

Hi
Thanks for spending time for me .. it wont works it returns always string type...

Seshu

Ra-one · Answer 6 · 2011-05-15T20:14:00

Solution 2

try,

string st = Args.SortExpression.GetType().ToString();

Cheers

Posted 15-May-11 20:14pm

Ra-one

Comments

hiseshu 16-May-11 2:34am

Hi
Thanks for spending time for me .. it wont works it returns always string type...

Seshu

Ra-one 19-May-11 2:35am

I think you are getting It wrong, It will give the type in converted to string, If you want exact replace "string st" with "var st" and you are done

ambarishtv · Answer 7 · 2011-05-15T20:15:00

Solution 3

try this

C#

if (Args.GetType().Name == "String")
            {

               //Args is string
            }
            if (Args.GetType().Name == "Int32")
            {
               //Args is Integer

            }

Posted 15-May-11 20:15pm

ambarishtv