What is the C# equivalent to PHP's “self::”?

问题:

In C# when I want to call a static method of a class from another static method of that class, is there a generic prefix that I can use such as PHP's self:: instead of the class name?

So in the below example, instead of saying Customer.DatabaseConnectionExists(), how can I say something like Self.DatabaseConnectionExists() so e.g. later if I change the name of the class I don't have to go change all the prefixes?

class Customer
{
    public string FirstName { get; set; }
    public string LastName { get; set; }

    public static Customer GetCurrentCustomer()
    {
        if (Customer.DatabaseConnectionExists())
        {
            return new Customer { FirstName = "Jim", LastName = "Smith" };
        }
        else
        {
            throw new Exception("Database connection does not exist.");
        }
    }

    public static bool DatabaseConnectionExists()
    {
        return true;
    }
}

回答1:

There's no real equivalent - you have to either specify the class name, i.e.

Customer.DatabaseConnectionExists()

or miss out the qualifier altogether, i.e.

DatabaseConnectionExists()

The latter style of calling is advisable since it's simpler and doesn't lose any meaning. Also, it's more inline with method calling in instances (i.e. calling by InstanceMethod() and not this.InstanceMethod(), which is overly verbose).

回答2:

If you're calling the method from inside the class, you don't need to specify anything like ::Self, just the method name will do.

class Customer
{
    public string FirstName { get; set; }
    public string LastName { get; set; }

    public static Customer GetCurrentCustomer()
    {
        if (DatabaseConnectionExists())
        {
            return new Customer { FirstName = "Jim", LastName = "Smith" };
        }
        else
        {
            throw new Exception("Database connection does not exist.");
        }
    }

    public static bool DatabaseConnectionExists()
    {
        return true;
    }
}

回答3:

Just leave it out. DatabaseConnectionExists is defined inside the class.

回答4:

Just call it without any prefix.

回答5:

No, there isn´t. But with the refactor tools, changing a name of a class should not worry you too much.