ASP Exists方法用於返回一個布爾值,如果指定的鍵存在,則該布爾值返回true,否則返回false。
用法:
DictionaryObject.Exists(key)
參數:該方法具有上麵提到的和下麵討論的單個參數:
- Key:它指定要在字典中搜索的鍵值的名稱。
例:下麵的代碼演示了ASP Dictionary.Exists方法。
ASP
<%
dim dict
'Create a new dictionary
set dict=Server.CreateObject("Scripting.Dictionary")
'Add values to the dictionary
dict.Add "g","geeks"
dict.Add "p","placements"
dict.Add "c","competitive"
'Check if the key exists in the dictionary
if dict.Exists("g")=true then
Response.Write("The 'g' key exists in the dictionary")
else
Response.Write("The 'g' key does not exist in the dictionary")
end if
Response.Write("<br>")
'Check for another key in the dictionary
if dict.Exists("m")=true then
Response.Write("The 'm' key exists in the dictionary")
else
Response.Write("The 'm' key does not exist in the dictionary")
end if
set dict=nothing
%>
輸出:
The 'g' key exists in the dictionary The 'm' key does not exist in the dictionary
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注:本文由純淨天空篩選整理自ManasChhabra2大神的英文原創作品 ASP Exists Method。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。