asp

asp数组如何进行查找

小樊
85
2024-10-23 07:45:17
栏目: 编程语言

在ASP(Active Server Pages)中,可以使用多种方法来查找数组中的元素。以下是一些常用的方法:

  1. 使用for循环遍历数组

    Dim arr(5)
    arr(0) = "Apple"
    arr(1) = "Banana"
    arr(2) = "Cherry"
    arr(3) = "Date"
    arr(4) = "Elderberry"
    arr(5) = "Fig"
    
    Dim i, foundItem
    foundItem = ""
    For i = 0 To UBound(arr)
        If arr(i) = "Cherry" Then
            foundItem = arr(i)
            Exit For
        End If
    Next
    
    Response.Write("Found item: " & foundItem)
    
  2. 使用Array.IndexOf方法(仅适用于.NET Framework 3.5及更高版本)

    <%@ Import Namespace="System.Linq" %>
    
    Dim arr(5)
    arr(0) = "Apple"
    arr(1) = "Banana"
    arr(2) = "Cherry"
    arr(3) = "Date"
    arr(4) = "Elderberry"
    arr(5) = "Fig"
    
    Dim foundItem = arr.IndexOf("Cherry")
    
    If foundItem >= 0 Then
        Response.Write("Found item: " & arr(foundItem))
    Else
        Response.Write("Item not found")
    End If
    
  3. 使用Array.Find方法(仅适用于.NET Framework 3.5及更高版本)

    <%@ Import Namespace="System.Linq" %>
    
    Dim arr(5)
    arr(0) = "Apple"
    arr(1) = "Banana"
    arr(2) = "Cherry"
    arr(3) = "Date"
    arr(4) = "Elderberry"
    arr(5) = "Fig"
    
    Dim foundItem = arr.Find(Function(x) x = "Cherry")
    
    If foundItem IsNot Nothing Then
        Response.Write("Found item: " & foundItem)
    Else
        Response.Write("Item not found")
    End If
    
  4. 使用for…each循环和Array.Contains方法(仅适用于.NET Framework 3.5及更高版本)

    <%@ Import Namespace="System.Linq" %>
    
    Dim arr(5)
    arr(0) = "Apple"
    arr(1) = "Banana"
    arr(2) = "Cherry"
    arr(3) = "Date"
    arr(4) = "Elderberry"
    arr(5) = "Fig"
    
    Dim foundItem = ""
    For Each item In arr
        If item = "Cherry" Then
            foundItem = item
            Exit For
        End If
    Next
    
    If foundItem <> "" Then
        Response.Write("Found item: " & foundItem)
    Else
        Response.Write("Item not found")
    End If
    

请注意,以上示例中的方法主要适用于.NET Framework 3.5及更高版本。如果您使用的是更早版本的.NET Framework,可能需要使用不同的方法或库来实现数组查找功能。

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