如何在使用泛型类时修复CA2225(OperatorOverloadsHaveNamedAlternates)

Question

我正在尝试使用以下消息解决CA2225(ContrainedValue<T>下面的WARN):Provide a method named 'ToXXX' or 'FromXXX' as an alternate for operator 'ConstrainedValue<T>.implicit operator T(ConstrainedValue<T>)'.

我还贴了PositiveInteger用来说明用例ConstrainedValue<T>. ConstrainedValue<T>使衍生物能够在构造函数中简单地指定应用于值类型的约束.这似乎是一种非常干净的编码方式.有没有办法解决CA2225警告,因为我正在处理泛型类型？如何提供备用运营商？

• 也许我可以为所有值类型实现ToInt,ToDouble等等,如果它们from不是同一类型,它们会抛出？但我认为让ToXXX方法抛出是一种不好的做法？
• 我可以创建在中间层ConstrainedValue<T>和PositiveInteger<T>,一ConstrainedInteger类.我可以ToInt()参加那个班级.但是,为了满足CA2225而创建一个层似乎是错误的,我不认为警告会消失ConstrainedValue<T>,我不得不压制这个警告.

码:

namespace OBeautifulCode.AutoFakeItEasy
 {
    using System.Diagnostics;

    using Conditions;

    /// <summary>
    /// Represents a constrained value.
    /// </summary>
    /// <typeparam name="T">The type of the constrained value.</typeparam>
    [DebuggerDisplay("{Value}")]
    public abstract class ConstrainedValue<T>
        where T : struct
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="ConstrainedValue{T}"/> class.
        /// </summary>
        /// <param name="value">The value of the <see cref="ConstrainedValue{T}"/> instance.</param>
        protected ConstrainedValue(T value)
        {
            this.Value = value;
        }

        /// <summary>
        /// Gets the underlying value of the instance.
        /// </summary>
        public T Value { get; }

        /// <summary>
        /// Performs an implicit conversion from <see cref="ConstrainedValue{T}"/> to the underlying value type.
        /// </summary>
        /// <param name="from">The <see cref="ConstrainedValue{T}"/> to convert from.</param>
        /// <returns>
        /// The result of the conversion.
        /// </returns>
        public static implicit operator T(ConstrainedValue<T> from)
        {
            return from.Value;
        }            
    }

    /// <summary>
    /// Represents a positive integer.
    /// </summary>
    [DebuggerDisplay("{Value}")]
    public sealed class PositiveInteger : ConstrainedValue<int>
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="PositiveInteger"/> class.
        /// </summary>
        /// <param name="value">The value held by the <see cref="PositiveInteger"/> instance.</param>
        public PositiveInteger(int value)
            : base(value)
        {
            Condition.Requires(value, nameof(value)).IsGreaterThan(0);
        }
    }
}

Answer 1

您可以通过实际执行它所说的操作来使代码分析变得愉快：

将其插入ConstrainedValue<T>，警告就会消失。

public T ToT()
{
  return this.Value;
}

就我个人而言，我宁愿抑制该消息，即使该语言不提供强制转换，您也已经提供了一种获取值的方法。