using System;

/// <summary>
/// 对象扩展函数
/// </summary>
public static class ObjectExtension
{
    /// <summary>
    /// 检查对象是否为null
    /// </summary>
    /// <param name="self"></param>
    /// <returns></returns>
    public static bool IsNull(this object self)
    {
        return self == null;
    }

    /// <summary>
    /// 检查对象是否不为null
    /// </summary>
    /// <param name="self"></param>
    /// <returns></returns>
    public static bool IsNotNull(this object self)
    {
        return !self.IsNull();
    }

    /// <summary>
    /// 检查对象是否为null,当为null时抛出异常
    /// </summary>
    /// <param name="self">对象值</param>
    /// <param name="name">异常信息</param>
    /// <exception cref="ArgumentNullException">参数为空的异常</exception>
    public static void CheckNull(this object self, string name)
    {
        if (self.IsNull())
        {
            throw new ArgumentNullException(name, " can not be null.");
        }
    }
}