Question

以下子投掷

＆＃34;对象引用未设置为对象的实例。＆＃34;

异常。

For Each element As Song In modFiles.getSongs()
    Dim col(2) As String
    Dim item As ListViewItem
    col(0) = element.SongTitle
    col(1) = element.PlayTime
    col(2) = element.SongFilename
    item = New ListViewItem(col)
    setList.Items.Add(item)
Next

在行

上抛出异常

col(0) = element.SongTitle
col(1) = element.PlayTime
col(2) = element.SongFilename

任何帮助将不胜感激

Answer 1

Your array declaration is fine.

您的For Each迭代器正在某处返回一个null对象。在循环体周围包裹一个空测试。

For Each element As Song In modFiles.getSongs()
    If element IsNot Nothing Then
        Dim col(2) As String
        Dim item As ListViewItem
        col(0) = element.SongTitle
        col(1) = element.PlayTime
        col(2) = element.SongFilename
        item = New ListViewItem(col)
        setList.Items.Add(item)
    End If
Next

Answer 2

你忘记了数组中的一个元素

Dim col(3) As String

VB.net数组抛出异常

2 个答案: