在C＃中将int与System.Numerics.BigInteger进行相互转换 [英] converting int to/from System.Numerics.BigInteger in C#

问题描述

我有一个返回 System.Numerics.BigInteger 的属性。当我将该属性转换为int时，出现此错误。

I have a property that returns System.Numerics.BigInteger. When I casting the property to int, I got this error.

无法将类型'System.Numerics.BigInteger'转换为'int'

如何在C＃中与 System.Numerics.BigInteger 相互转换？

How can I convert int to/from System.Numerics.BigInteger in C#?

推荐答案

从BigInteger转换为Int32 是明确的，因此仅将 BigInteger 变量/属性分配给 int 变量是行不通的：

The conversion from BigInteger to Int32 is explicit, so just assigning a BigInteger variable/property to an int variable doesn't work:

BigInteger big = ...

int result = big;           // compiler error:
                            //   "Cannot implicitly convert type
                            //    'System.Numerics.BigInteger' to 'int'.
                            //    An explicit conversion exists (are you
                            //    missing a cast?)"

此方法有效（尽管如果在运行时可能会引发异常，该值太大而无法容纳在 int 变量中）：

This works (although it might throw an exception at runtime if the value is too large to fit in the int variable):

BigInteger big = ...

int result = (int)big;      // works

---

请注意，如果 BigInteger 值装在对象中，您无法对其拆箱并将其转换为 int 同时：

---

Note that, if the BigInteger value is boxed in an object, you cannot unbox it and convert it to int at the same time:

BigInteger original = ...;

object obj = original;      // box value

int result = (int)obj;      // runtime error
                            //   "Specified cast is not valid."

这有效：

BigInteger original = ...;

object obj = original;            // box value

BigInteger big = (BigInteger)obj; // unbox value

int result = (int)big;            // works

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