如何通過vb.net中的按鈕單擊來檢查datagridview單元格是否爲空？

Question

我需要幫助時，過濾或檢查如果一個或多個datagridview單元格爲空或不保存數據之前。我嘗試了幾個代碼，但總是有錯誤。下面是圖片。

在此先感謝。

Answer 1

For Each rw As DataGridViewRow In dataGridView1.Rows 
    For i As Integer = 0 To rw.Cells.Count - 1     
     If rw.Cells(i).Value Is Nothing OrElse rw.Cells(i).Value = DBNull.Value OrElse String.IsNullOrWhitespace(rw.Cells(i).Value.ToString()) Then 
        'empty 
     End If 
    Next 
Next 

Answer 2

你可以寫這樣的功能：

Public Function IsDataGridViewEmpty(ByRef dataGridView As DataGridView) As Boolean 
    Dim isEmpty As Boolean = True 
    For Each row As DataGridViewRow In dataGridView.Rows 
     For Each cell As DataGridViewCell In row.Cells 
      If Not String.IsNullOrEmpty(cell.Value) Then 
       If Not String.IsNullOrEmpty(Trim(cell.Value.ToString())) Then 
        isEmpty = False 
        Exit For 
       End If 
      End If 
     Next 
    Next 
    Return isEmpty 
End Function 

或使用LINQ：

Public Function IsDataGridViewEmpty(ByRef dataGridView As DataGridView) As Boolean 
    Dim isEmpty As Boolean = True 
    For Each row As DataGridViewRow In From row1 As DataGridViewRow In dataGridView.Rows Where (From cell As DataGridViewCell In row1.Cells Where Not String.IsNullOrEmpty(cell.Value)).Any(Function(cell) Not String.IsNullOrEmpty(Trim(cell.Value.ToString()))) 
     isEmpty = False 
    Next 
    Return isEmpty 
End Function