主题：查询表DrawCell出错

If e.Col.Name = "入库审核" Then
    e.StartDraw()
    Dim msg As String
    Dim tl As Integer = e.Text.Length
    Select Case tl
        Case 2
            msg = "  " & e.Text & "  "
        Case 3
            msg = " " & e.Text & " "
        Case Else
            msg = e.Text
    End Select
    If msg = "" Then Return
    If tl <= 4 Then
        e.Col.Width = 61
    Else
        e.Col.width = tl * 15 + 1
    End If
   
    Dim w As Integer = e.Width - 4
    Dim h As Integer = e.Height - 4
    Dim x As Integer = e.x + (e.Width - w) / 2
    Dim n As Pen
    Dim fnt As New Font("宋体", 9, FontStyle.Bold)
    Dim br As Brush
   
    If e.Text.Contains("已") Then
        n = New Pen(Color.Green, 2)
        br = New SolidBrush(color.Green)
    Else
        n = New Pen(Color.Red, 2)
        br = New SolidBrush(color.red)
    End If
   
    e.Graphics.DrawRectangle(n, x, e.y + 2, w, h)
    e.Graphics.DrawString(msg, fnt, br, x + 1, e.y + 4)
    e.Text = ""
    e.EndDraw()
End If

.NET Framework 版本：4.0.30319.42000
Foxtable 版本：2022.8.18.1
错误所在事件：表，入库物资导入_Table1，DrawCell
详细错误信息：
调用的目标发生了异常。
未将对象引用设置到对象的实例。

在外部表用DrawCell 用正常，在查询表里出错

If e.Col.Name = "入库审核" Then
    if e.row.isnull("入库审核") then return
    e.StartDraw()
    Dim msg As String
    Dim tl As Integer = e.Text.Length
    Select Case tl
        Case 2
            msg = "  " & e.Text & "  "
        Case 3
            msg = " " & e.Text & " "
        Case Else
            msg = e.Text
    End Select
    If msg = "" Then Return
    If tl <= 4 Then
        e.Col.Width = 61
    Else
        e.Col.width = tl * 15 + 1
    End If
   
    Dim w As Integer = e.Width - 4
    Dim h As Integer = e.Height - 4
    Dim x As Integer = e.x + (e.Width - w) / 2
    Dim n As Pen
    Dim fnt As New Font("宋体", 9, FontStyle.Bold)
    Dim br As Brush
   
    If e.Text.Contains("已") Then
        n = New Pen(Color.Green, 2)
        br = New SolidBrush(color.Green)
    Else
        n = New Pen(Color.Red, 2)
        br = New SolidBrush(color.red)
    End If
   
    e.Graphics.DrawRectangle(n, x, e.y + 2, w, h)
    e.Graphics.DrawString(msg, fnt, br, x + 1, e.y + 4)
    e.Text = ""
    e.EndDraw()
End If

.NET Framework 版本：4.0.30319.42000
Foxtable 版本：2022.8.18.1
错误所在事件：表，入库物资导入_Table1，DrawCell
详细错误信息：
调用的目标发生了异常。
未将对象引用设置到对象的实例。

If e.Col.Name = "入库审核" Then
    If e.Row.isnull("入库审核") Then Return
   
   
    MessageBox.Show(e.Row.isnull("入库审核"))
    e.StartDraw()
    Dim msg As String
    Dim tl As Integer = e.Text.Length
   
    Select Case tl
        Case 2
            msg = "  " & e.Text & "  "
        Case 3
            msg = " " & e.Text & " "
        Case Else
            msg = e.Text
           
           
            MessageBox.Show(tl)
            MessageBox.Show(msg)
           
           
    End Select

MessageBox.Show(tl)
MessageBox.Show(msg)

这两个没有返回值，直接提示错误

.NET Framework 版本：4.0.30319.42000
Foxtable 版本：2022.8.18.1
错误所在事件：表，入库物资导入_Table1，DrawCell
详细错误信息：
调用的目标发生了异常。
未将对象引用设置到对象的实例。