判断数组、集合list、string、int、double等是否为空，判断是否为值类型

1.判断数组、集合list、string、int、double等是否为空

private void button35_Click(object sender, EventArgs e)
        { 
            string aa = "";
            string bb = null;
            string cc = string.Empty;
            qq dd = new qq();
            string[] ee = new string[1] { "1"};
            List<string> ff = new List<string>();
            //Console.WriteLine(GetIsNull(aa));
            //Console.WriteLine(GetIsNull(bb));
            //Console.WriteLine(GetIsNull(cc));
            //Console.WriteLine(GetIsNull(dd));

            Console.WriteLine(GetIsNull(ee));

            //Console.WriteLine(GetIsNull(ff));
        }



public bool GetIsNull(object obj)
        {
            if (obj is Array)
            {
                return ((object[])obj).Length > 0 ? true : false;
            }
            else
            if (obj is IList)//using System.Collections.Generic;
            {
                return ((IList)obj).Count > 0 ? true : false;
            }
            else
            {
                string aa = Convert.ToString(obj);
                if (!string.IsNullOrEmpty(aa)&&aa!=null)
                {
                    return false;
                }
            } 
            return false;
        }

 

2.。是否为值类型

object  val

1. if (val.GetType ()==typeof (int))
{
  ........
}

2.  if (val is int)
             {
             ............

    }

object aa="123";
var bb= aa.GetType();//获取类型
//这里bb就为string，注意：如果object为null  GetType()会抛出异常