Return multiple values from method-CodePudding

I want to return multiple values from my method ValidateAddress(). I know that I could create a new class which contains all the properties I need and return this class, but is it possible to directly return two values from a method?

ValidateAddress()

public void ValidateAddress(string address)
{
    if (string.Equals(address, "address"))
    {
        // return address and true
    }
    else
    {
        // return address and false
    }
}

CodePudding user response：

If you want to return multiple types in one method, you can use tuples. In the method signature, you can use parenthesis to specify the types you want to return.

Example:

var result = ValidateAddress("address");
Console.WriteLine(result.Item1);
Console.WriteLine(result.Item2);

(string, bool) ValidateAddress(string address)
{
    if (string.Equals(address, "address"))
    {
        return (address, true);
    }
    else
    {
        return (address, false);
    }
}

If you want to give a name to these values, there are two different ways. One way is to give a name to the types in the method signature.

Example:

var result = ValidateAddress("address");
Console.WriteLine(result.address);
Console.WriteLine(result.isValid);

(string address, bool isValid) ValidateAddress(string address)
{
    if (string.Equals(address, "address"))
    {
        return (address, true);
    }
    else
    {
        return (address, false);
    }
}

The second possibility is to create two local variables in the return.

Example:

(string address, bool isValid) = ValidateAddress("address");
Console.WriteLine(address);
Console.WriteLine(isValid);

(string, bool) ValidateAddress(string address)
{
    if (string.Equals(address, "address"))
    {
        return (address, true);
    }
    else
    {
        return (address, false);
    }
}

CodePudding user response：

You can:

public bool ValidateAddress(string address)
{
    return (string.Equals(address, "address"))
        ? true
        : false;
}

You don't need to return address as you passed it in the first place :)

CodePudding user response：

You can return multiple values from a method by using the out keyword

public void ValidateAddress(out string address, out bool isValid)
{
    address = "";
    isValid = true;
}

You can call this method like this

string address;
bool isValid;

ValidateAddress(out address, out isValid);