可能这是一个简单的问题，但我正在尝试所有的转换方法！并且仍然有错误！
你能帮我吗？
小数？ （可为空的小数）到小数
有很多选择...
decimal? x = ...
decimal a = (decimal)x; // works; throws if x was null
decimal b = x ?? 123M; // works; defaults to 123M if x was null
decimal c = x.Value; // works; throws if x was null
decimal d = x.GetValueOrDefault(); // works; defaults to 0M if x was null
decimal e = x.GetValueOrDefault(123M); // works; defaults to 123M if x was null
object o = x; // this is not the ideal usage!
decimal f = (decimal)o; // works; throws if x was null; boxes otherwise
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