C# |用指定的键和值在 OrderedDictionary 中插入一个新条目

原文:https://www . geesforgeks . org/c-sharp-insert-a-new-entry-in-ordered dictionary-with-specified-key-and-value/

OrderedDictionary。Insert(Int32，Object，Object)方法用于在指定索引处用指定的键和值向OrderedDictionary集合插入一个新条目。

语法:

public void Insert (int index, object key, object value);

参数:

指数:是系统类型的零基指数。Int32 元素应该插入的位置。

键:是要添加的条目的键。

值:是要添加的条目的值。该值可以是空值。

异常:

  • argumentoutofrangerexception:如果指数超出范围。
  • NotSupportedException: 如果集合是只读的。

以下程序说明了上述方法的使用:

例 1:

// C# code to add a new entry into the
// OrderedDictionary collection with
// the specified key and value at the
// specified index.
using System;
using System.Collections;
using System.Collections.Specialized;

class GFG {

    // Driver method
    public static void Main()
    {

        // Creating a orderedDictionary named myDict
        OrderedDictionary myDict = new OrderedDictionary();

        // Adding key and value in myDict
        myDict.Add("key1", "value1");
        myDict.Add("key2", "value2");
        myDict.Add("key3", "value3");
        myDict.Add("key4", "value4");
        myDict.Add("key5", "value5");

        Console.WriteLine("Before Updation: ");

        // Displaying the key/value pairs in myDict
        foreach(DictionaryEntry de in myDict)
            Console.WriteLine(de.Key + " --> " + de.Value);

        // using Insert(Int32, Object, Object) Method
        // to add a new entry at index 5
        myDict.Insert(5, "key6", "value6");

        Console.WriteLine("\nAfter Updation: ");

        // Displaying the key/value pairs in myDict
        foreach(DictionaryEntry de in myDict)
            Console.WriteLine(de.Key + " --> " + de.Value);
    }
}

输出:

Before Updation: 
key1 --> value1
key2 --> value2
key3 --> value3
key4 --> value4
key5 --> value5

After Updation: 
key1 --> value1
key2 --> value2
key3 --> value3
key4 --> value4
key5 --> value5
key6 --> value6

例 2:

// C# code to add a new entry into the
// OrderedDictionary collection with
// the specified key and value at the
// specified index.
using System;
using System.Collections;
using System.Collections.Specialized;

class GFG {

    // Driver method
    public static void Main()
    {

        // Creating a orderedDictionary named myDict
        OrderedDictionary myDict = new OrderedDictionary();

        // Adding key and value in myDict
        myDict.Add("1", "C");
        myDict.Add("2", "C++");
        myDict.Add("3", "Java");
        myDict.Add("4", "Python");
        myDict.Add("5", "C#");

        Console.WriteLine("Before Updation: ");

        // Displaying the key/value pairs in myDict
        foreach(DictionaryEntry de in myDict)
            Console.WriteLine(de.Key + " --> " + de.Value);

        // using Insert(Int32, Object, Object) Method
        // this will give error as index is out of range
        // here indexing is zero-based
        myDict.Insert(6, "6", "HTML");

        Console.WriteLine("\nAfter Updation: ");

        // Displaying the key/value pairs in myDict
        foreach(DictionaryEntry de in myDict)
            Console.WriteLine(de.Key + " --> " + de.Value);
    }
}

运行时错误:

未处理异常: 系统。ArgumentOutOfRangeException:指定的参数超出有效值范围。 参数名称:索引

注:

  • 如果索引参数等于 OrderedDictionary 集合中的条目数，则键和值参数将被追加到集合的末尾。
  • 插入点之后的条目向下移动以容纳新条目，并且移动条目的索引也会更新。

参考:

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