SortedList<TKey,TValue>.IDictionary.Contains(Object) 方法

 virtual bool System.Collections.IDictionary.Contains(System::Object ^ key) = System::Collections::IDictionary::Contains;

bool IDictionary.Contains (object key);

abstract member System.Collections.IDictionary.Contains : obj -> bool
override this.System.Collections.IDictionary.Contains : obj -> bool

Function Contains (key As Object) As Boolean Implements IDictionary.Contains

參數

傳回

Boolean

如果 true 包含具有該索引鍵的項目，則為 IDictionary，否則為 false。true if the IDictionary contains an element with the key; otherwise, false.

實作

例外狀況

範例

下列程式碼範例示範如何搭配使用 IDictionary.Contains 介面的方法 System.Collections.IDictionary SortedList<TKey,TValue> 。The following code example shows how to use the IDictionary.Contains method of the System.Collections.IDictionary interface with a SortedList<TKey,TValue>. 此範例示範 false 如果提供了錯誤資料類型的索引鍵，方法會傳回。The example demonstrates that the method returns false if a key of the wrong data type is supplied.

程式碼範例是針對方法提供的較大範例（包括輸出）的一部分 IDictionary.Add 。The code example is part of a larger example, including output, provided for the IDictionary.Add method.

using System;
using System.Collections;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        // Create a new sorted list of strings, with string keys,
        // and access it using the IDictionary interface.
        //
        IDictionary openWith = new SortedList<string, string>();

        // Add some elements to the sorted list. There are no
        // duplicate keys, but some of the values are duplicates.
        // IDictionary.Add throws an exception if incorrect types
        // are supplied for key or value.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("bmp", "paint.exe");
        openWith.Add("dib", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");

Imports System.Collections
Imports System.Collections.Generic

Public Class Example
    
    Public Shared Sub Main() 

        ' Create a new sorted list of strings, with string keys,
        ' and access it using the IDictionary interface.
        '
        Dim openWith As IDictionary = _
            New sortedList(Of String, String)
        
        ' Add some elements to the sorted list. There are no 
        ' duplicate keys, but some of the values are duplicates.
        ' IDictionary.Add throws an exception if incorrect types
        ' are supplied for key or value.
        openWith.Add("txt", "notepad.exe")
        openWith.Add("bmp", "paint.exe")
        openWith.Add("dib", "paint.exe")
        openWith.Add("rtf", "wordpad.exe")

// Contains can be used to test keys before inserting
// them.
if (!openWith.Contains("ht"))
{
    openWith.Add("ht", "hypertrm.exe");
    Console.WriteLine("Value added for key = \"ht\": {0}",
        openWith["ht"]);
}

// IDictionary.Contains returns false if the wrong data
// type is supplied.
Console.WriteLine("openWith.Contains(29.7) returns {0}",
    openWith.Contains(29.7));

' Contains can be used to test keys before inserting 
' them.
If Not openWith.Contains("ht") Then
    openWith.Add("ht", "hypertrm.exe")
    Console.WriteLine("Value added for key = ""ht"": {0}", _
        openWith("ht"))
End If

' IDictionary.Contains returns False if the wrong data 
' type is supplied.
Console.WriteLine("openWith.Contains(29.7) returns {0}", _
    openWith.Contains(29.7))

    }
}

    End Sub

End Class

備註

false如果的型別 key 無法指派給的索引鍵類型，則這個方法會傳回 TKey SortedList<TKey,TValue> 。This method returns false if key is of a type that is not assignable to the key type TKey of the SortedList<TKey,TValue>.

此方法是 O (記錄 n) 作業，其中 n 是 Count 。This method is an O(log n) operation, where n is Count.

適用於

另請參閱

• ContainsKey(TKey)
• ContainsValue(TValue)