零除法不会在 nunit 中引发异常
通过 NUnit 运行以下 C# 代码会产生结果
Test.ControllerTest.TestSanity: Expected: `<System.DivideByZeroException>` But was: null
因此，要么不会抛出 DivideByZeroException，要么 NUnit 不会捕获它。类似于 this 问题，但他得到的答案是似乎不适合我。这是使用 NUnit 2.5.5.10112 和 .NET 4.0.30319。
[Test]
public void TestSanity()
{
Assert.Throws<DivideByZeroException>(new TestDelegate(() => DivideByZero()));
}
private void DivideByZero()
{
// Parse "0" to make sure to get an error at run time, not compile time.
var a = (1 / Double.Parse("0"));
}
有什么想法吗？
Running the following C# code through NUnit yields
Test.ControllerTest.TestSanity: Expected: `<System.DivideByZeroException>` But was: null
So either no DivideByZeroException is thrown, or NUnit does not catch it. Similar to this question, but the answers he got, do not seem to work for me. This is using NUnit 2.5.5.10112, and .NET 4.0.30319.
[Test]
public void TestSanity()
{
Assert.Throws<DivideByZeroException>(new TestDelegate(() => DivideByZero()));
}
private void DivideByZero()
{
// Parse "0" to make sure to get an error at run time, not compile time.
var a = (1 / Double.Parse("0"));
}
Any ideas?
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评论（2）
没有抛出异常。 1 / 0.0 只会给你 double.PositiveInfinity。这是 IEEE 754 标准指定的内容，C#（以及基本上所有其他系统）也遵循该标准。
如果您希望浮点除法代码中出现异常，请显式检查零，然后自行抛出异常。如果您只是想看看 DivideByZeroException 会得到什么，可以手动抛出它或将整数除以整数零。
No exception is thrown. 1 / 0.0 will just give you double.PositiveInfinity. This is what the IEEE 754 standard specifies, which C# (and basically every other system) follows.
If you want an exception in floating point division code, check for zero explicitly, and throw it yourself. If you just want to see what DivideByZeroException will get you, either throw it manually or divide integers by integer zero.
来自 MSDN：
您正在处理
double，而不是任何整数类型（int等）或decimal。即使在checked上下文中，double也不会抛出异常。你只需得到+INF。如果您想计算积分数学（并获得例外），请使用：
From MSDN:
You are dealing with
double,not any of the integral types (intetc) ordecimal.doubledoesn't throw an exception here, even in acheckedcontext. You just get +INF.If you want to evaluate as integral math (and get the exception), use: