我有一個SQL Server數據庫,用於填充數據表,它是datagridview控件的數據源。我想隱藏datagridview控件中以字符串開頭的所有列:如何通過列名以字符串開頭的字符串來搜索SQL Server數據庫中的列?
strColumnName = "Checkpoint " & intCheckpointNumber
我該怎麼做?我正在使用VB2010。
在哪裏我已經結束了,這顯然是行不通的是以下幾點:
Do While intCheckpoint < intTotalCheckPoints
If Me.datagridview.Columns ' I cannot figure out how to insert something along the lines of Name.StartsWith(strColumnName)' Then
'Hide this column with something along the lines of 'Me.datagridview.Columns(strColumnName).Visible = False
End If
intCheckPoint += 1
Loop
我無法弄清楚如何隱藏基於什麼他們的名字開頭的列。
感謝
好吧,我已經修改了我的代碼,並結束了以下內容:
Try
Do
If m_DataTable.Columns.Contains("Checkpoint " & intCheckPointNumber & " Time") Then
Dim tabNewCheckpoint As New TabPage
Dim dgvNewCheckpoint As New DataGridView
tabNewCheckpoint.Name = "tabCheckpoint" & intCheckPointNumber
tabNewCheckpoint.Text = "Checkpoint " & intCheckPointNumber
tabctrlTimingTable.TabPages.Add(tabNewCheckpoint)
dgvNewCheckpoint.Name = "dgvCheckpoint" & intCheckPointNumber
dgvNewCheckpoint.DataSource = m_DataTable
dgvNewCheckpoint.Size = dgvTimingP2P.Size
tabNewCheckpoint.Controls.Add(dgvNewCheckpoint)
strColumnName = "Checkpoint " & intCheckPointNumber
For Each col As DataGridViewColumn In dgvNewCheckpoint.Columns
MessageBox.Show(col.Name)
If col.Name.StartsWith("Checkpoint") Then
If Not col.Name.StartsWith(strColumnName) Then
col.Visible = False
End If
End If
Next
Else
Exit Do
End If
intCheckPointNumber += 1
Loop
Catch ex As Exception
'MessageBox.Show(ErrorToString)
End Try
,我現在的問題是,該欄目還沒有隱藏。如果我在程序中插入停止,我可以看到代碼甚至沒有處理For ... Next Loop。什麼會造成這種情況?
感謝
好了,現在我已經改變了:
For Each col As DataGridViewColumn In dgvNewCheckpoint.Columns
MessageBox.Show(col.Name)
If col.Name.StartsWith("Checkpoint") Then
If Not col.Name.StartsWith(strColumnName) Then
col.Visible = False
End If
End If
Next
要:
For Each col As DataColumn In m_DataTable.Columns
MessageBox.Show(col.ColumnName)
If col.ColumnName.StartsWith("Checkpoint") Then
If Not col.ColumnName.StartsWith(strColumnName) Then
dgvNewCheckpoint.Columns(col.ColumnName).Visible = False
End If
End If
Next
,它給我一個錯誤:「對象引用不設置到對象的實例「但datagridview列與數據表列有相同的名稱,所以我不明白這是可能的。有任何想法嗎?
代碼的上下文是什麼? 「我」是指某種形式還是某種東西? –
而不是循環檢查點編號,循環遍歷列。 '作爲DataGridViewColumn在DataGridview.Columns ...'每個col ...' – prprcupofcoffee
感謝大衛,這是非常有幫助的。我確實編輯了我原來的帖子,提出了另一個問題,提出了這種方法。 – J2Tuner