在VB.NET中如何检查gridview中的特定列是空的？ [英] How to check specific column in gridview is empty in VB.NET?

问题描述

我有列empID，日期，CheckIn时间，结帐时间，电话。

如果checkintime为空，我只需要显示一个按钮（签入），

如果结账时是空的，我必须只显示结账按钮。

如果两者都有值，我必须禁用两个按钮。



我尝试过：

I have the columns empID,Date,CheckIn time,Checkout Time,phone.
If checkintime is empty i have to display only one button(checkin),
if checkout is empty i have to display only checkout button.
if both has values i have to disable both buttons.

What I have tried:

If GridView1.Columns.Count > 0 Then
            Button1.Visible = False

        Else
            Button1.Visible = True
        End If

推荐答案

可能是这样的：

It could be something like this :

Private Sub DataGridView1_CellContentClick(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.CellValueChanged

    If e.RowIndex >= 0 Then
        Dim myCell As Object

        myCell = DataGridView1.Rows(e.RowIndex).Cells(2).Value
        If myCell IsNot Nothing Then
            If myCell.ToString.Trim <> "" Then ButtonCheckIn.Visible = True
        End If

        myCell = DataGridView1.Rows(e.RowIndex).Cells(3).Value
        If myCell IsNot Nothing Then
            If myCell.ToString.Trim <> "" Then ButtonCheckout.Visible = True
        End If

    End If
End Sub

默认情况下按钮应为Visible = False

By default both Buttons should be Visible = False

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