对于带有列表框的Vb.net中的每个循环，请选中复选框 [英] For Each Loop In Vb.net with Listbox,checklistbox

问题描述

 sid = ""
For Each st As String In ListBox1.SelectedItems

            If sid = "" Then
                sid = st
            Else
                sid += st
            End If

  Next
        MessageBox.Show(sid)

它给我一个错误:-从类型"DataRowView"到类型"String"的转换无效.

我如何阅读SelectedItem或SelectedValues或Checkedvalues
我正在使用Visual Studio 2005
请帮助

it is giving me an error :- Conversion from type ''DataRowView'' to type ''String'' is not valid.

how can i read SelectedItem or SelectedValues or Checkedvalues
i am using visual studio 2005
please help

推荐答案

对不起，下面的代码也能正常工作

Extremely sorry the below code also works fine

sid = ""
For Each st As String In ListBox1.SelectedItems

            If sid = "" Then
                sid = st
            Else
                sid += st
            End If

  Next
        MessageBox.Show(sid)

问题是，在这种情况下，我已经设置了ListBox的数据源和displaymember属性，因此for和for-each循环不起作用，我不知道为什么，如果有人有任何想法请与我们分享.

problem is i have set the datasource and displaymember property of ListBox in that case for and for-each loop don''t work, i don''t know why, if some one have any idea please share with us.

我通过for循环完成了此操作

i done this with for loop

Dim i As Integer
Dim str As String = ""

For i = 0 To ListBox1.SelectedItems.Count - 1
    str = str & " " & ListBox1.SelectedItems(i).ToString
Next
MessageBox.Show(str)

Dim i As Integer
Dim str As String = ""

For i = 0 To CheckedListBox1.CheckedItems.Count - 1
    str = str & " " & CheckedListBox1.CheckedItems(i).ToString
Next
MessageBox.Show(str)

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