如何檢查datagrid視圖中單元格的長度值？

Question

我能夠驗證單元格是否爲空，但我無法檢查單元格的長度。我希望用戶輸入5位數字，如果它小於5，則顯示一個消息框。

我試過cellvalue.length方法，但它不工作。

Private Sub dgvResults_CellValidating(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellValidatingEventArgs) Handles dgvResults.CellValidating 
     'variables 
     Dim columnName As String = dgvResults.Columns(e.ColumnIndex).Name 
     Dim cellVal As String = e.FormattedValue.ToString() 

     'Datagrid view validation 
     If ((e.ColumnIndex = 0) And (e.FormattedValue = "") And (Not (cellVal.Length = 5))) Then 
      e.Cancel = True 
      MessageBox.Show(columnName & " must be 5 Digits Long!") 
     ElseIf (e.ColumnIndex = 1 And e.FormattedValue = "") Then 
      e.Cancel = True 
      MessageBox.Show(columnName & " cannot be blank!") 
     ElseIf (e.ColumnIndex = 2 And e.FormattedValue = "") Then 
      e.Cancel = True 
      MessageBox.Show(columnName & " cannot be blank!") 
     ElseIf ((e.ColumnIndex = 3) And (e.FormattedValue = "") And (Not IsNumeric(e.FormattedValue))) Then 
      e.Cancel = True 
      MessageBox.Show(columnName & " cannot be blank!") 
     ElseIf ((e.ColumnIndex = 4) And (Not IsNumeric(e.FormattedValue))) Then 
      e.Cancel = True 
      MessageBox.Show(columnName & " cannot be blank!") 
     End If 

    End Sub 

Answer 1

以下原因你的代碼到不行：

(e.FormattedValue = "") And (Not (cellVal.Length = 5)) 

要檢查是否爲空值也它的長度<> 5.

但是你想確保t帽子cellVal.Length = 5：

If e.ColumnIndex = 0 AndAlso cellVal.Length <> 5 Then 
     e.Cancel = True 
     MessageBox.Show(columnName & " must be 5 Digits Long!") 
End If 

Answer 2

我認爲你將需要：

cellval.text.length