C#/.NET : Why can't I cast this decimal to an int?-6ren

C#/.NET : Why can't I cast this decimal to an int?

转载作者：行者123 更新时间：2023-11-30 16:29:26

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Possible Duplicate:
Why can't I unbox an int as a decimal?

好的，C#/.NET 专家，有人能告诉我为什么这个转换有效吗:

static void Main(string[] args)
{
    int _int = 0;
    decimal _decimal = 1;

    _int = (int)_decimal;

    Console.ReadLine();
}

...但是这些都没有？

static void Main(string[] args)
{
    int _int = 0;
    decimal d = 1;
    object _decimal = d;

    _int = (int)_decimal;

    Console.ReadLine();
}

static void Main(string[] args)
{
    int _int = 0;
    object _decimal = 1M;

    _int = (int)_decimal;

    Console.ReadLine();
}