请给我 C# 中隐式和显式类型转换的例子 [英] Please give me example of implicit and explicit type conversion in C#

问题描述

谁能给我在现实生活中隐式类型转换的例子.我知道隐式类型转换意味着从派生类到基类的转换，但我不知道如何在 C# 中进行编码.我不想在 2 行中定义它.我想定义一个完整的程序来显示 c# 中的隐式和显式类型转换.请帮帮我.

can any one give me implicit type conversion example in real life. I know implicit type conversion means conversion from derived to base class but i don't know how to show in coding in c#. I don't want to define it in 2 lines. I want to define a full program to show implicit and explicit type conversion in c#. Please help me.

问候

推荐答案

不，隐式类型转换只是意味着不需要在代码中显式的类型转换.

No, implicit type conversion just means a type conversion which doesn't need to be explicit in the code.

LINQ to XML 提供了很好的例子:

LINQ to XML provides good examples:

// Implicit conversion from string to XNamespace
XNamespace ns = "http://url.com";

XElement element = new XElement("foo", "bar");
// Explicit conversion of XElement to string
string value = (string) element;

这就是它们使用的方式 - 您可以使用 MSDN 中显示的代码类型创建自己的显式或隐式转换运算符(明确，隐式).

So that's how they're used - and you create your own explicit or implicit conversion operators using the kind of code shown in MSDN (explicit, implicit).

简短、完整但毫无意义的例子:

Short, complete, but pointless example:

class Foo
{
    private readonly int value;

    private Foo(int value)
    {
        this.value = value;
    }

    public static implicit operator Foo(int value)
    {
        return new Foo(value);
    }

    public static explicit operator int(Foo foo)
    {
        if (foo == null)
        {
            throw new ArgumentException("foo");
        }
        return foo.value;
    }
}

class Test
{    
    static void Main(string[] args)
    {
        int x = 10;
        Foo foo = x;
        int y = (int) foo;
    }
}

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