类中所有值类型的常规函数

Question

I'm trying to accomplish the following within a class:

public void Test(var input)
{
    WriteToFile(input.ToString());
}

private void WriteToFile(string input)
{
    .....
}

But the 'var' statement can not be used within a class. So I'm wondering what the easiest way is to accomplish the same thing as above.

One solution would be to create a function for each value type, but that must be more trouble than necessary:

public void Test(string input)
{
    WriteToFile(input);
}

public void Test(int input)
{
    WriteToFile(input.ToString());
}

public void Test(double input)
{
    WriteToFile(input.ToString());
}

private void WriteToFile(string input)
{
    .....
}

EDIT : When giving it some more thought I understood that this wasn't really the answer to my problems. I'm posting a new question that has more thought behind it. I'm not gonna delete this question though since someone else might find this usefull.

Answer 1

Just pass object and call ToString() on it:

public void Test(object input)
{
    WriteToFile(input.ToString());
}

Answer 2

public void Test<T>(T input)
{
    WriteToFile(Convert.ToString(input));
}

Answer 3

You could try to use public void Test(object input)

and maybe test (input!= null) before calling the tostring method

Answer 4

Make the function Test accepting an object parameter and proceed after determining the type inside it.

public void Test(object input)
{
      var res = (dynamic)null;
      if (input.GetType() == typeof(String)))
      {
            res = input.ToString();
            WriteToFile(res);
      }
}

EDIT: Why this method ?

In future, if you need to extend support to other types as well, you could do something like below (as the question talks about float, double, long, int...)

public void Test(object input)
{
      var res = (dynamic)null;
      if (input.GetType() == typeof(String)))
      {
            res = input.ToString();
            WriteToFile(res);
      }
      if (input.GetType() == typeof(float)))
      {
           //do some other operations here...
      }
}

Even nicer way of implementing this would be using "is" operator.

      if (input is string)
      {
            res = input.ToString();
            WriteToFile(res);
      }