什么是C＃相当于PHP的“self ::”？

Question

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 eg 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;
    }
}

Answer 1

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

Customer.DatabaseConnectionExists()

or miss out the qualifier altogether, ie

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 (ie calling by InstanceMethod() and not this.InstanceMethod() , which is overly verbose).

Answer 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;
    }
}

Answer 3

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

Answer 4

只需调用它，不带任何前缀。

Answer 5

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