从属性的setter抛出异常是什么？ [英] What exception to throw from a property setter?

问题描述

我有一个具有一个最大长度要求，因为数据链接到数据库中的字串属性。 ？我应该抛出什么异常，如果主叫方试图设置字符串超过这个长度

I have a string property that has a maximum length requirement because the data is linked to a database. What exception should I throw if the caller tries to set a string exceeding this length?

例如，这个C＃代码：

public string MyProperty
{
    get
    {
        return _MyBackingField;
    }
    set
    {
        if (value.Length > 100)
            throw new FooException("MyProperty has a maximum length of 100.");

        _MyBackingField = value;
    }
}

我认为的ArgumentException ，但它只是看起来不正确。的技术上的，它是一个功能 - MyProperty_set（字符串值） - 这样的情况下，的ArgumentException 是可以，但它没有被作为函数调用到消费者的眼睛 - 这是在赋值运算符的右侧。

I considered ArgumentException, but it just doesn't seem right. Technically, it is a function - MyProperty_set(string value) - so a case for ArgumentException can be made, but it's not being called as a function to the consumer's eyes - it's on the right side of an assignment operator.

这问题很可能也将扩大到包括各类财产setter方法​​进行数据验证的，但我在上述情况下特别感兴趣。

This question could probably also be extended to include all kinds of data validation done in property setters, but I'm particularly interested in the above case.

推荐答案

有通过与反射mscorlib.dll中一看，在类似的情况，如System.String.StringBuilder.Capacity微软使用ArgumentOutOfRangeException（）类似

Have a look through mscorlib.dll with Reflector, in a similar situation such as System.String.StringBuilder.Capacity Microsoft use ArgumentOutOfRangeException() similar to:

public int PropertyA
{
    get
    {
        return //etc...
    }
    set
    {
        if (condition == true)
        {
            throw new ArgumentOutOfRangeException("value", "/* etc... */");
        }
        // ... etc
    }
}

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