问链接基构造函数时，如何在重载中重用初始化代码

EN

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;
    }
}