此方法(位於System.Collections命名空間下)用於在不刪除對象的情況下返回堆棧頂部的對象。此方法類似於Pop方法，但是Peek不會修改Stack。
用法:
public virtual object Peek ();
返回值：它返回堆棧頂部的對象。
異常：在空堆棧上調用Peek()方法將引發InvalidOperationException。因此，在使用Peek()方法檢索元素之前，請始終檢查堆棧中的元素。
下麵給出了一些示例，以更好地理解實現。
示例1:
// C# code to illustrate the
// Stack.Peek Method
using System;
using System.Collections;
class GFG {
// Driver code
public static void Main()
{
// Creating a Stack
Stack myStack = new Stack();
// Inserting the elements into the Stack
myStack.Push("1st Element");
myStack.Push("2nd Element");
myStack.Push("3rd Element");
myStack.Push("4th Element");
myStack.Push("5th Element");
myStack.Push("6th Element");
// Displaying the count of elements
// contained in the Stack
Console.Write("Total number of elements"+
" in the Stack are : ");
Console.WriteLine(myStack.Count);
// Displaying the top element of Stack
// without removing it from the Stack
Console.WriteLine("Element at the top is : "
+ myStack.Peek());
// Displaying the top element of Stack
// without removing it from the Stack
Console.WriteLine("Element at the top is : "
+ myStack.Peek());
// Displaying the count of elements
// contained in the Stack
Console.Write("Total number of elements "+
"in the Stack are : ");
Console.WriteLine(myStack.Count);
}
}輸出：
Total number of elements in the Stack are : 6 Element at the top is : 6th Element Element at the top is : 6th Element Total number of elements in the Stack are : 6
示例2:
// C# code to illustrate the
// Stack.Peek Method
using System;
using System.Collections;
class GFG {
// Driver code
public static void Main()
{
// Creating a Stack
Stack myStack = new Stack();
// Displaying the top element of Stack
// without removing it from the Stack
// Calling Peek() method on empty stack
// will throw InvalidOperationException.
Console.WriteLine("Element at the top is : "
+ myStack.Peek());
}
}運行時錯誤：
Unhandled Exception:
System.InvalidOperationException: Stack empty.
參考：
相關用法
注：本文由純淨天空篩選整理自Kirti_Mangal大神的英文原創作品 Stack.Peek Method in C#。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。