链接基础构造函数时,如何在重载中重用初始化代码

Question

请参阅以下评论中嵌入的问题.

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;
    }
}

我愿意考虑重用基本构造函数和最小化初始化代码的替代实现.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.

Answer 1

public CustomException(string customField) : this(customField,"")
{
}

Answer 2

将其分解为一个单独的方法，并从两个构造函数调用该方法。

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;
    }
}