C＃|将SortedList元素复制到数组对象

SortedList.CopyTo(Array，Int32)方法用于从数组中指定的索引处开始，将SortedList元素复制到一维Array对象。

句法：

public virtual void CopyTo (Array array, int arrayIndex);

参数：

array: It is the one-dimensional Array object that is the destination of the DictionaryEntry objects copied from SortedList. The Array must have zero-based indexing.

arrayindex: It is the zero-based index in array at which copying begins.

例外情况：

• ArgumentNullException：如果数组为null。
• ArgumentOutOfRangeException：如果arrayindex小于零。
• ArgumentException：如果数组是多维的，或者源SortedList对象中的元素数大于从arrayIndex到目标数组末尾的可用空间。
• InvalidCastException：如果源SortedList的类型不能自动转换为目标数组的类型。

下面的程序说明了上面讨论的方法的使用：

范例1：

// C# code to copy the SortedList elements
// to a 1-D Array object, starting at the
// specified index in the array
using System;
using System.Collections;
  
class Geeks {
  
    // Main Method
    public static void Main(String[] args)
    {
  
        // Creating a SortedList of integers
        SortedList mylist = new SortedList();
  
        // Adding elements to SortedList
        mylist.Add("1", "C#");
        mylist.Add("2", "Java");
        mylist.Add("3", "DSA");
        mylist.Add("4", "Python");
        mylist.Add("5", "C");
  
        // creating a 1-D array
        DictionaryEntry[] myArr = new DictionaryEntry[mylist.Count];
  
        // Copying SortedList to Array
        // instance at the specified index
        mylist.CopyTo(myArr, 0);
  
        // Displaying elements in myArr
        for (int i = 0; i < myArr.Length; i++) {
            Console.WriteLine(myArr[i].Key + "-->" + myArr[i].Value);
        }
    }
}

输出：

1-->C#
2-->Java
3-->DSA
4-->Python
5-->C

范例2：

// C# code to copy the SortedList elements
// to a 1-D Array object, starting at the
// specified index in the array
using System;
using System.Collections;
  
class Geeks {
  
    // Main Method
    public static void Main(String[] args)
    {
  
        // Creating a SortedList of integers
        SortedList mylist = new SortedList();
  
        // Adding elements to SortedList
        mylist.Add("1st", "Ram");
        mylist.Add("2nd", "Shyam");
        mylist.Add("3rd", "Rohit");
        mylist.Add("4th", "Manish");
        mylist.Add("5th", "Vikas");
  
        // creating a 1-D array
        DictionaryEntry[] myArr = new DictionaryEntry[mylist.Count];
  
        // Copying SortedList to Array
        // instance at the specified index
        // This will raise "ArgumentOutOfRangeException"
        // as index is less than 0
        mylist.CopyTo(myArr, -2);
  
        // Displaying elements in myArr
        for (int i = 0; i < myArr.Length; i++) {
            Console.WriteLine(myArr[i].Key + "-->" + myArr[i].Value);
        }
    }
}

运行时错误：

Unhandled Exception:
System.ArgumentOutOfRangeException: Non-negative number required.
Parameter name: arrayIndex

参考：

• https://docs.microsoft.com/zh-cn/dotnet/api/system.collections.sortedlist.copyto?view=netframework-4.7.2