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You can validate data by handling the Cell Validating event, which is raised by the Data Grid View when the current cell changes.

In this walkthrough, you will retrieve rows from the column and tries to leave the cell, the Cell Validating event handler will examine new company name string to make sure it is not empty; if the new value is an empty string, the Data Grid View will prevent the user's cursor from leaving the cell until a non-empty string is entered.

Please also try not to crowd your code with explanatory comments, this reduces the readability of both the code and the explanations!

Net)Data Grid Viewでの入力チェックはCell Validatingだけではダメの続きとなります。 前回の最後で、「この場合だと、一つでも入力エラーとなれば、正しい値を入れるまで何もできない(フォームを閉じることさえ)ので、実装には工夫が必要」と書きました。 今回はその工夫の1つで、間違った入力をされたら、その行は消すという方法です。 列数が1つとか2つかの場合には有効だと思います。 実際に行を消すのは Row Validated イベントで行っています。 厄介だったのは、Row.

When you display data entry functionality to users, you frequently have to validate the data entered into your form.

The Data Grid View class provides a convenient way to perform validation before data is committed to the data store.

What happens is the highlighted cell remains at the row/column of the cell with the cancelled edit. Data Grid View Cell Validating Event Args) Handles dgv Actions. Name '..procedure's name Dim flg Debug As Boolean = False '...debug/test purposes only Dim flg Cancel As Boolean = False Try If dgv Actions.

My Data Grid View is bound to a Data Table via a Binding Source. Delete() のときにまた、Row Validated イベントが走ってしまうという点です。 これを回避するために、賢い方法ではないですが、例外を捕まえてキャンセルさせるという方法にしました。もっといい方法はないんでしょうかね。 下記がコードです。Data Table等の環境は前回と同じです。 .Net(213) Linux(127) ネットワーク(81) PHP(68) Open Office(48) Active Directory(40) ツール(35) Windows7(33) Windows Server2008(33) Data Grid View(30) ハードウェア(30) Windows Server2003(28) HTML(24) SQL(24) グループポリシー(24) セキュリティ(23) ADO. Text = "Data Grid View validation demo (disallows empty Company Name)" End Sub Private Sub Form1_Load(By Val sender As System. All Cells Except Header) End Sub Private Sub data Grid View1_Cell Validating(By Val sender As Object, _ By Val e As Data Grid View Cell Validating Event Args) _ Handles data Grid View1. Header Text ' Abort validation if cell is not in the Company Name column. Equals("Company Name") Then Return ' Confirm that the cell is not empty. Load ' Initialize the Binding Source and bind the Data Grid View to it. Data Source = Get Data("select * from Customers") Grid View1. Auto Resize Columns( _ Data Grid View Auto Size Columns Mode.

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