当链接基本构造，我怎么能重复使用的初始化code在过载 [英] When chaining a base constructor, how can I reuse initialization code in an overload

问题描述

请参阅嵌入在下面的评论的问题。

Please see question embedded in comment below.

public class CustomException : Exception
{
    private readonly string _customField;

    public CustomException(string customField, string message)
        : base(message)
    {
        // What's the best way to reuse the customField initialization code in the
        // overloaded constructor? Something like this(customField)
    }

    public CustomException(string customField)
    {
        _customField = customField;
    }
}

我愿意考虑重新使用基构造，并尽量减少初始code替代实现。我想保持_customField只读，如果我提取一个单独的初始化方法，这是不可能的。

I'm open to considering alternative implementations that reuse the base constructor and minimize initialization code. I'd like to keep the _customField readonly, which is not possible if I extract a separate initialization method.

推荐答案

因子它成一个单独的方法，并调用该方法从两个构造函数。

Factor it out into a separate method, and call that method from both constructors.

public class CustomException : Exception
{
    private readonly string _customField;

    public CustomException(string customField, string message)
        : base(message)
    {
        Init(out _customField, customField);
    }

    public CustomException(string customField)
        : base()
    {
        Init(out _customField, customField);
    }

    private Init(out string _customField, string customField)
    {
        _customField = customField;
    }
}

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