Generic method which return datatype from string value

Using reflaxtion can get generic type. may help bellow link 

https://learn.microsoft.com/en-us/dotnet/framework/reflection-and-codedom/how-to-examine-and-instantiate-generic-types-with-reflection

Hi Naimish, 

please find the below code example for your use case 

Type GetStaticType < T > (T x) { return typeof(T); }

Since its generic input (x) accepts any type of input and returns the datatype. 

Hello Naimish,

Simple way to achieve as below,

class Program
{
    static void Main(string[] args)
    {
        var res =  "123".ChangeType().GetType();
    }

    public static T ChangeType(this object obj)
    {
        return (T)Convert.ChangeType(obj, typeof(T));
    }
}

You can try this. 

public static Type GetDataType(string input)
{
    int intValue;
    decimal decimalValue;
    Guid guidValue;
    if (int.TryParse(input, out intValue))
    {
        return typeof(int);
    }
    else if (decimal.TryParse(input, out decimalValue))
    {
        return typeof(decimal);
    }
    else if (Guid.TryParse(input, out guidValue))
    {
        return typeof(Guid);
    }
    else
    {
        return typeof(string);
    }
}

Hi,

For my use I did it like below code.

    public static Type GetType(string value)
    {
        if (int.TryParse(value, out int _))
            return typeof(int);
        else if (double.TryParse(value, out double _))
            return typeof(double);
        else if (bool.TryParse(value, out bool _))
            return typeof(bool);
        else if (decimal.TryParse(value, out decimal _))
            return typeof(decimal);
        else if (long.TryParse(value, out long _))
            return typeof(long);
        else if (short.TryParse(value, out short _))
            return typeof(short);
        else if (Guid.TryParse(value, out Guid _))
            return typeof(Guid);
        else
            return typeof(string);
    }

I tried with  TypeCode typeCode = Type.GetTypeCode(value.GetType()); also but this always gave me the string.

Regards,
Pasang

Hello Amit In your method we need to specify the type while declaring the variable. 

I want something like

public Type GetType(string value)
{
    //Logic.. to convert value to specific type
    //EX: value -> 0 -> int
    // value -> "Hello" -> string
    // value -> “9245fe4a-d402-451c-b9ed-9c1a04247482” -> GUID
    return Type;
}

Hi,

A similar question is already available, check this reference :

https://stackoverflow.com/questions/8625/generic-type-conversion-from-string

Check this

public class MyClass
{
    public T MyMethod(string value)
    {
        return (T)TypeDescriptor.GetConverter(typeof(T)).ConvertFromInvariantString(value);
    }
}

MyClass myClass = new MyClass();
var result1 = myClass.MyMethod("5");
var result2 = myClass.MyMethod("hello");
var result3 = myClass.MyMethod("10.20");
var result4 = myClass.MyMethod("8ccf2028-55da-4abe-805b-9f952432e789");