C# |如何获取哈希表指定键的哈希代码
原文:https://www . geeksforgeeks . org/c-sharp-如何获取哈希表指定键的哈希代码/
哈希表。GetHash(Object) 方法用于获取一个 Hashtable 对象的指定键的 hashcode。该方法继承自对象类。
语法:
protected virtual int GetHash(Object Key);
异常:如果键为空，该方法将给出空引用异常。
以下程序说明了上述方法的使用:
例 1:
// C# Program to illustrate the
// Hashtable.GetHash(Object) method
using System;
using System.Collections;
// Inheriting Hashtable as
// Hashtable.GetHash(Object)
// method is protected method
class HashCode : Hashtable {
// Main Method
static void Main(string[] args)
{
// creating object for HashCode as
// to access protected methods we
// have to create object for the
// derived class
HashCode h = new HashCode();
// Add Elements into Hashtable
h.Add("1001", "Parek Shetty");
h.Add("1002", "Deshmuk Narayan");
h.Add("1003", "Ratan Kaalikaran");
ICollection Key = h.Keys;
foreach(string val in Key)
{
// printing Hashtable
Console.Write(val + " : " + h[val]);
Console.Write("\n");
// printing hashcode with keys
int hcode = h.GetHash(val);
Console.Write(val + " : " + hcode);
Console.Write("\n");
}
}
}
Output:
1002 : Deshmuk Narayan
1002 : 985757554
1001 : Parek Shetty
1001 : -1708895167
1003 : Ratan Kaalikaran
1003 : -1892225314
例 2:
// C# Program to illustrate the
// Hashtable.GetHash(Object) method
using System;
using System.Collections;
class HashCode : Hashtable {
// Main Method
static void Main(string[] args)
{
HashCode h = new HashCode();
// Adding elements
h.Add('A', "Pritam Devadhya");
h.Add('B', "Arjun Balachi");
h.Add('C', "Timanad Panigrahi");
ICollection Key = h.Keys;
int hcode = h.GetHash('C');
Console.Write("HashCode: " + hcode);
}
}
Output:
HashCode: 4390979
参考:
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