在列表框中获取所选项目的ValueMember
我看过几篇类似的问题,但是我无法成功地在代码中重复答案. 以下代码将项目及其值成员添加到列表框中.
I've seen a couple of posts asking a similar question but I have not been able to duplicate the answers in my code successfully. The following code adds items and their value member to a list box.
Public Shared Sub ListFiles(hTab As Hashtable)
Debug.Print("create file and key" & Now)
Dim Enumerator As IDictionaryEnumerator
Enumerator = hTab.GetEnumerator()
Dim MyKeys As ICollection
Dim Key As Object
MyKeys = hTab.Keys()
If (hTab.Count > 0) Then
For Each Key In MyKeys
Dim sfileName As String = hTab(Key)
Dim first As Integer = sfileName.IndexOf("_")
Dim last As Integer = sfileName.LastIndexOfAny("_")
Dim first2 = (first + 1)
Dim splitFile = sfileName.Substring(first2)
frmViewFiles.ListBox1.Items.Add(splitFile)
frmViewFiles.ListBox1.ValueMember = Key
frmViewFiles.ListBox1.SelectedValue = Key
Next
End If
End Sub
当我运行代码以获取所选项目的值成员时
Dim file = ListBox1.ValueMember.ToString()
我可以选择我选择的第一个项目,但随后的选择不会将值成员更改为所选项目的成员.
When I run my code to get the selected items value member
Dim file = ListBox1.ValueMember.ToString()
I can acess the first item I choose but subsequent selections dont change the value member to that of the selected item.
请指引我.
谢谢您的回答.这是我的新代码:
Thank you for your answers. this is my new code:
Public Shared Sub runListFiles(CustomerId As String)
Dim cfp As New CloudFilesProvider(cloudId)
Dim containerObjectList As IEnumerable(Of ContainerObject) = cfp.ListObjects(container:="EstherTest", identity:=cloudId, prefix:=CustomerId & "_")
For Each file As ContainerObject In containerObjectList
Dim sFullFileName As String = file.Name
Dim first As Integer = sFullFileName.IndexOf("_")
Dim first2 = (first + 1)
Dim splitFile = sFullFileName.Substring(first2)
'frmViewFiles.ListBox1.Items.Add(splitFile)
'frmViewFiles.ListBox1.ValueMember = sFullFileName
Dim fb = New myFile
fb.FileName = splitFile
fb.FullPath = sFullFileName
frmViewFiles.ListBox1.Items.Add(fb)
frmViewFiles.ListBox1.DisplayMember = fb.FileName
frmViewFiles.ListBox1.ValueMember = fb.FullPath
这是我的课程:
Public Class myFile
Public Property FileName As String
Public Property FullPath As String
Public Sub New(f As String, b As String)
FileName = f
FullPath = b
End Sub
结束班级
请在下面查看我的评论并提供帮助
Please see my comment below and assist
ValueMember
应该表示添加到Items集合中的对象的属性名称:the property to use as the actual value for the items in the ListControl.
ValueMember
is supposed to indicate the property name of an object added to the Items collection: the property to use as the actual value for the items in the ListControl.
您没有将对象添加到控件中,因此哈希表中的Key
与ValueMember
毫无意义.您的帖子在传递时引用了一个文件变量,因此我假设这与显示文件名有关,同时希望在选择/单击时获取完整的路径名.未显示WebForms/Winforms/WPF,我假设使用WinForms:
You are not adding objects to the control, so Key
from the hashtable is meaningless as the ValueMember
. Your post references a file variable in passing, so I will assume this revolves around showing the filename while wanting to get the full pathname when selected/clicked. WebForms/Winforms/WPF was not indicated, I am assuming WinForms:
Public Class myFile
Public Property FileName As String
Public Property FullPath As String
Public Property FileSize As Int64 ' just so there is something else
Public Sub New(f as String, p as String, s as Int64)
FileName = f
FullPath = b
FileSize = s
End Sub
End Class
让我们说我们想将其中一些添加到ListBox中,对于添加的每个项目,我们希望FileName
显示为文本,但希望通过FullPath
找回它们:
Lets say we want to add some of these to a ListBox, for each item added we want FileName
to display as the text, but want to get them back by FullPath
:
Dim f As myFile
' assume these come from a fileinfo
For Each fi as FileInfo in DirectoryInfo.GetFiles(searchFor)
f = New myFile
f.FileName = fi.Name
f.FullPath = fi.FullPath
f.FileSize = fi.Length
' myFile accepts all the prop values in the constructor
' so creating a new one could also be written as:
' f = New myFile(fi.Name, fi.FullPath, fi.Length)
myListBox.Items.Add(f)
Next n
如果myFile对象存储在List(of myFile)
中,而不是将它们添加到控件中,则可以将List绑定为数据源,而不必进行迭代或复制:
If the myFile objects were stored to a List(of myFile)
rather than adding them to the control, we can bind the List as the DataSource and not have to iterate or copy:
mylistBox.DataSource = myFileList
无论哪种方式,Display-和ValueMember都是指我们希望使用的属性名称:
Either way, Display- and ValueMember refer to the property names we wish to use:
myListBox.DisplayMember = "FileName" ' indicate property name of obj to SHOW
myListBox.ValueMember = "FullPath" ' prop name of object to return
当您选择一个列表框项目时,myListBox.SelectedValue
将引用单击的myFile
对象的FullPath
. SelectedIndex
仍将引用列表中该项目的索引.
When you select a listbox item, myListBox.SelectedValue
would refer to the FullPath
of the myFile
object clicked on. The SelectedIndex
would still refer to the index of the item in the list.
tl;博士
ValueMember和DisplayMember是指列表中表示的对象的属性名称.
ValueMember and DisplayMember refers to the Property Names of Objects represented in the list.
注意: