Arrays VB.net数组引发异常

下面的潜艇正在投掷

“对象引用未设置为对象的实例。”

例外

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

异常是在行上抛出的

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

---

如果您忘记了数组中的一个元素，将不胜感激

Dim col(3) As String

---

数组中忘记了一个元素

Dim col(3) As String

您的

For Each

迭代器在某处返回空对象。围绕循环体包装一个空测试

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

您的

For Each

迭代器在某处返回空对象。围绕循环体包装一个空测试

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

数组绑定为0，列（2）有三项。数组绑定为0，列（2）有三项。