c# - Better ways for type casting in C#

Question

Case 1: we can convert type by the following ways .....

1. First way

       int someInt = 10;
       double someDouble = (double) someInt;
   

2. Same thing in second way

       int someInt = 10;
       double someDouble = Convert.ToDouble(someInt);
   

Case 2: We can convert somethings into string by the following ways .......

1. First way

       int someInt = 10;
       string someString =  someInt.ToString();
   

2. Second way

       int someInt = 10;
       string someString =  someInt.ToString(CultureInfo.InvariantCulture);
   

Now my question is which one is good?? I am asking this question because ReSharper always gives me suggestion like 2nd way for both cases. I don't which one should I follow.

Answer 1

1. 案例1 - 两种方式都相同，第一种方式更快一点。
2. 案例 2 - 第一种方式可能很危险，因为int.ToString()用作Culture.CurrentCulture参数（因此结果可能因计算机而异）：

如：

someInt.ToString() == someInt.ToString(CultureInfo.CurrentCulture);

Answer 2

强制转换变量只是调用显式运算符方法，这是句法技巧。通过方法进行强制转换和转换完全相同或应该完全相同。不同的是特定类如何选择实现它。您可以让转换运算符处理 null 或不处理 null，这取决于您。

考虑我制作的以下自定义类。想想看，铸造中发生的一切都可以在方法中以相同的方式完成。这只是格式化魔术。

//explicitly convert int to my class
public static explicit operator MyClass(int t)
{
return new MyClass();
}

//static method to convert int to my class
public static MyClass ToMyClass()
{
return new MyClass();
}