Why can't I explicitly cast an int to a string?

If I try to do this it doesn't work:

static void Main(string[] args)
{
    int a = 5000;
    Con开发者_如何转开发sole.WriteLine((string)a);
}

But somehow this works fine:

static void Main(string[] args)
{
    int a = 5000;
    Console.WriteLine(a + "");
}

Why is that? Is it because the first is trying to change the base type and the second just appends the value to the string?

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int cannot be cast to string (1), but there is an operator + that accepts int as left-hand argument and string as right-hand argument (2). This operator converts the int to string and concatenates the two strings.

A better approach would probably be to just use Console.WriteLine(a); which would call a.ToString() for you.

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So you are getting a compile time error right? The problem is is that int does not explicitly cast to string.

So

(string)a

is not valid code but

a + ""

mean that the code will work because it basically get translated to

a.ToString() + ""

So the int gets converted into a string value

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You should use:

static void Main(string[] args)
{
    int a = 5000;
    Console.WriteLine(a);
}

that implicitly calls a.ToString()

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To cast a int in a string you must use int32.parse(string )

That's not right, the parse method of Int32 returns an integer, which is parsed from a string.

To get the string representation of another datatype just use .ToString() from Object Class. Or you use System.Convert.ToString()

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That doesn't work because as you have assigned an purely integer value in to a you can not convert it into string by an implicit conversion, but which will work as follows

 static void Main(string[] args)
    {
        int a = 5000;
        Console.WriteLine(a);
    }

which is equal to Console.WriteLine(a.ToString());