我的問題是當我收到一個字符串,並且不是日期格式。並把錯誤置於文本框中。檢查字符串值如果在VB.net有效日期
例子:
Public Sub get_error(ByVal sheet_name As String, ByVal column_name As String, ByVal row_count As String, ByVal row_value As String)
Dim dt_row_service_provider_code As String = row_value
If dt_row_service_provider_code Is Nothing Or dt_row_service_provider_code = "" Then
dt_row_service_provider_code = "Empty Value"
End If
If dt_row_service_provider_code.Length > 50 Then
dt_row_service_provider_code = "Characters is greater than 50"
End If
txtError.Text += "sheet: " & sheet_name & " | column: " & column_name & " | row: " & (row_count + 2) & " | row value is: '" & dt_row_service_provider_code & "'" & Environment.NewLine
End Sub
'dr(2).Tostring contains word "test"
For Each dr As DataRow In dt.Rows
Dim holiday_code As String = dr(0).ToString
Dim holiday_desc As String = dr(1).ToString
Dim holiday_date As String = dr(2).ToString
If holiday_date Is Nothing Or holiday_date = "" Then
get_error(dt.TableName, dt.Columns(2).ToString, dt_row.ToString, "Empty Value")
End If
If isDate(holiday_date) = False Then
'show error message in textbox
get_error(dt.TableName, dt.Columns(2).ToString, dt_row.ToString, "Value is not a valid Date")
End If
Next
這是我的只是例子,因爲我的計劃是進口擅長數據庫,我只是把一些情況下,如果用戶一不小心就會在Excel中添加日期格式的字。現在我怎麼能把錯誤放在文本框?我不想只顯示一個例外,但我想把錯誤置於文本框中
你想檢查他是否意外地在文本框中寫了一封信?要限制字符的數量,你可以設置maxlength ..來檢查是否有任何字母,你可以使用textbox InStr函數 – Bone
不,我的意思是我想在文本框中顯示錯誤,並且該錯誤消息是自定義的,就像我將把錯誤值的行和列。 而我將收到的價值是從excel – Denmark