Cellvalidating e

Para fazer isso inclua um novo Data Set no projeto e arraste a partir da janela Data Base Explorer a tabela Customers do banco de dados

No cdigo estou atribuindo propriedade Data Member a tabela gerada no dataset.

The Cell End Edit event occurs only when the cell exits edit mode, which it cannot do if it fails validation.

private void data Grid View1_Cell Validating(object sender, Data Grid View Cell Validating Event Args e) void data Grid View1_Cell End Edit(object sender, Data Grid View Cell Event Args e) And Voila!

You do this by using the Formatted Value property of the Data Grid View Cell Validating Event Args parameter.

This property returns the new value entered in the cell.

In your example, you use the Cell Validating event, as shown below: Here, you want to ensure that the length of the new Customer ID is at least five characters.If it is less than five characters, you set the Error Text property of that cell to some error message.Notice how the Column Index and Row Index properties of Data Grid View Cell Validating Event Args parameter are used.Formatted Value に入っている値をチェックするロジックを入れる。 不正な値の時は「Cancel Edit()」メソッドを実行すると、変更前の値に戻る。 あと「e. Cancel = True」も必要(理由は後述) 「1」を入力した時に自動で「001」に補完したい時は、Data Grid View の Cell Parsing をハンドルする。 「e. Parsing Applied = True」する。 Enterキーを押下したり、Data Grid View の別のセルに移動したら編集は確定されるのだが、 そうではなく、同じフォームの「メニュー」項目をクリックしたり、 クローズボタンを押した場合は確定されず、編集中状態のまま、イベントが開始されてしまう。 こういう場合、編集中状態を解除するには 2種類方法があって、 (Data Grid View). Validate のいずれかを呼ぶ。 前者を呼ぶと編集は強制確定されるのだが、Cell Validating とか呼ばれないので、 おかしな値がそのまま入ってしまうこともある。よってお勧めしない。 後者の場合、フォーム中のコントロール全て(つまり Data Grid View含む)に対して登録操作が試みられる上に、 ちゃんと Data Grid View では Cell Validating が呼ばれるので、不正な値もちゃんとはじいてもらえる。 で、ここで値をはじいた場合、新に行おうとした操作もキャンセルすべきだろう (編集前の不本意な値で操作を続行されると不都合な結果になる)。 ここで生きているのが、先程の「Cell Validating での e. To perform any custom validation on the cell or row being edited, you can use the Cell Validating and Row Validation events, respectively.

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