C# |获取 OrderedDictionary 的只读副本
原文:https://www . geesforgeks . org/c-sharp-get-a-read-only-copy-the-ordered dictionary/
OrderedDictionary。AsReadOnly 方法返回当前 OrderedDictionary 集合的只读副本。
语法:
public System.Collections.Specialized.OrderedDictionary AsReadOnly ();
返回值:当前 OrderedDictionary 集合的只读副本。
下面给出了一些例子,以便更好地理解实现:
例 1:
// C# code to get a read-only
// copy of the OrderedDictionary
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");
// To Get a read-only copy of
// the OrderedDictionary
OrderedDictionary myDict_1 = myDict.AsReadOnly();
// Checking if myDict_1 is read-only
Console.WriteLine(myDict_1.IsReadOnly);
}
}
输出:
True
例 2:
// C# code to get a read-only
// copy of the OrderedDictionary
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("A", "Apple");
myDict.Add("B", "Banana");
myDict.Add("C", "Cat");
myDict.Add("D", "Dog");
// To Get a read-only copy of
// the OrderedDictionary
OrderedDictionary myDict_1 = myDict.AsReadOnly();
// Checking if myDict_1 is read-only
Console.WriteLine(myDict_1.IsReadOnly);
}
}
输出:
True
注意:AsReadOnly 方法在当前 OrderedDictionary 集合周围创建一个只读包装。对 OrderedDictionary 集合所做的更改会反映在只读副本中。
参考:
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