在 C# 中将超出范围的数字转换为枚举不会产生异常 [英] Casting an out-of-range number to an enum in C# does not produce an exception

问题描述

以下代码不会产生异常，而是将值 4 传递给 tst.谁能解释这背后的原因?

The following code does not produce an exception but instead passes the value 4 to tst. Can anyone explain the reason behind this?

 public enum testing
 { 
    a = 1,
    b = 2,
    c = 3
 }

testing tst = (testing)(4);

推荐答案

在 C# 中，与 Java 不同，不检查枚举.您可以拥有任何基础类型的值.这就是为什么检查您的输入非常重要.

In C#, unlike Java, enums are not checked. You can have any value of the underlying type. This is why it's pretty important to check your input.

if(!Enum.IsDefined(typeof(MyEnum), value))
     throw new ArgumentOutOfRangeException();

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