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XML 文档注释可用于提供可由工具轻松处理的 API 文档：

/// <summary>
/// A helper class for validating method arguments.
/// </summary>
public static class Precondition
{
    /// <summary>
    ///     Throws an <see cref="ArgumentOutOfRangeException"/> with the parameter
    ///     name set to <c>paramName</c> if <c>value</c> does not satisfy the 
    ///     <c>predicate</c> specified.
    /// </summary>
    /// <typeparam name="T">
    ///     The type of the argument checked
    /// </typeparam>
    /// <param name="value">
    ///     The argument to be checked
    /// </param>
    /// <param name="predicate">
    ///     The predicate the value is required to satisfy
    /// </param>
    /// <param name="paramName">
    ///     The parameter name to be passed to the
    ///     <see cref="ArgumentOutOfRangeException"/>.
    /// </param>
    /// <returns>The value specified</returns>
    public static T Satisfies<T>(T value, Func<T, bool> predicate, string paramName)
    {
        if (!predicate(value))
            throw new ArgumentOutOfRangeException(paramName);

        return value;
    }
}

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