相关疑难解决方法(0)

我有一个List,有时它是空的或null.我希望能够检查它是否包含任何List项,如果没有,则将对象添加到List.

 // I have a list, sometimes it doesn't have any data added to it
    var myList = new List<object>(); 
 // Expression is always false
    if (myList == null) 
        Console.WriteLine("List is never null"); 
    if (myList[0] == null) 
        myList.Add("new item"); 
    //Errors encountered:  Index was out of range. Must be non-negative and less than the size of the collection.
    // Inner Exception says "null"