Checking if a variable is of data type double

Question

I need to check if a variable I have is of the data type double. This is what I tried:

try
{
    double price = Convert.ToDouble(txtPrice.Text);
}
c         


        

Answer 1

Why dont you try something like this -

  double doubleVar;
    if( typeof(doubleVar) == double ) {
        printf("doubleVar is of type double!");
    }

This can easily check if the variable is of a type double .

Answer 2

Use this:

double price;
bool isDouble = Double.TryParse(txtPrice.Text, out price);
if(isDouble) {
  // double here
}

Answer 3

You could also use .GetType() to return the type of the variable if you are unsure what is being returned if a method is being called to generate the number. See http://msdn.microsoft.com/en-us/library/58918ffs(v=vs.71).aspx for an example.

Answer 4

Use the Double.TryParse method:

double price;
if (Double.TryParse(txtPrice.Text, out price))
{
    Console.WriteLine(price);
}
else
{
    Console.WriteLine("Not a double!");
}