GridViewDeletedEventArgs.Values プロパティ
アセンブリ: System.Web (system.web.dll 内)

削除されたレコードのキー以外のフィールドの名前と値のペアのディクショナリを格納している IOrderedDictionary。

Values プロパティを使用して、削除されたレコードのキー以外のフィールドの値にアクセスします。たとえば、これらの値を使用して、削除されたレコードのログを維持できます。
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Values プロパティは、項目のテンプレートで双方向のバインド式が使用されている場合のみ設定されます。双方向のバインド式の詳細については、「データベースへのバインド」を参照してください。 |
Values プロパティは、System.Collections.Specialized.IOrderedDictionary インターフェイスを実装するオブジェクトを返します。このオブジェクトは、削除されたレコードのキー以外のフィールドを表す System.Collections.DictionaryEntry オブジェクトを格納します。

Values プロパティを使用して、削除されたレコードのキー以外のフィールドの値にアクセスする方法の例を次に示します。
<%@ Page language="VB" %> <script runat="server"> Sub CustomersGridView_RowDeleted(ByVal sender As Object, ByVal e As GridViewDeletedEventArgs) Dim entry As DictionaryEntry ' Display the value of the key fields in the Keys property. KeysMessageLabel.Text = _ "The key fields for the deleted record are: <br/>" ' In VB, you cannot iterate through the DictionaryEntry objects ' in the Keys property directly. Use the CopyTo method to ' copy the objects to an array first. Dim keysArray(e.Keys.Count - 1) As DictionaryEntry e.Keys.CopyTo(keysArray, 0) ' Iterate through the array and display its values. For Each entry In keysArray DisplayValue(entry, KeysMessageLabel) Next ' Display the value of the non-key fields in the Values ' property. ValuesMessageLabel.Text = _ "The non-key fields for the deleted record are: <br/>" Dim valuesArray(e.Values.Count - 1) As DictionaryEntry e.Values.CopyTo(valuesArray, 0) For Each entry In valuesArray DisplayValue(entry, ValuesMessageLabel) Next End Sub Sub DisplayValue(ByVal entry As DictionaryEntry, ByVal displayLabel As Label) ' Display the field name contained in the DictionaryEntry object. If entry.Key IsNot Nothing Then displayLabel.Text &= "Name=" & entry.Key.ToString() & ", " Else displayLabel.Text &= "Name=null, " End If ' Display the field value contained in the DictionaryEntry object. If entry.Value IsNot Nothing Then displayLabel.Text &= "Value=" & entry.Value.ToString() & "<br/>" Else displayLabel.Text &= "Value=null<br/>" End If End Sub </script> <html> <body> <form runat="server"> <h3>GridViewDeletedEventArgs Keys and Values Example</h3> <asp:label id="Message" forecolor="Red" runat="server"/> <br/> <!-- The GridView control automatically sets the columns --> <!-- specified in the datakeynames property as read-only. --> <!-- No input controls are rendered for these columns in --> <!-- edit mode. --> <asp:gridview id="CustomersGridView" datasourceid="CustomersSqlDataSource" autogeneratecolumns="true" autogeneratedeletebutton="true" allowpaging="true" datakeynames="CustomerID" onrowdeleted="CustomersGridView_RowDeleted" runat="server"> </asp:gridview> <br/> <asp:label id="KeysMessageLabel" forecolor="Red" runat="server"/> <br/><br/> <asp:label id="ValuesMessageLabel" forecolor="Red" runat="server"/> <!-- This example uses Microsoft SQL Server and connects --> <!-- to the Northwind sample database. Use an ASP.NET --> <!-- expression to retrieve the connection string value --> <!-- from the Web.config file. --> <asp:sqldatasource id="CustomersSqlDataSource" selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]" deletecommand="Delete from Customers where CustomerID = @CustomerID" connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" runat="server"> </asp:sqldatasource> </form> </body> </html>
<%@ Page language="C#" %> <script runat="server"> void CustomersGridView_RowDeleted(Object sender, GridViewDeletedEventArgs e) { // Display the value of the key fields in the Keys property. KeysMessageLabel.Text = "The key fields for the deleted record are: <br/>"; foreach (DictionaryEntry entry in e.Keys) { DisplayValue(entry, KeysMessageLabel); } // Display the value of the non-key fields in the Values // property. ValuesMessageLabel.Text = "The non-key fields for the deleted record are: <br/>"; foreach (DictionaryEntry entry in e.Values) { DisplayValue(entry, ValuesMessageLabel); } } void DisplayValue(DictionaryEntry entry, Label displayLabel) { // Display the field name contained in the DictionaryEntry object. if (entry.Key != null) { displayLabel.Text += "Name=" + entry.Key.ToString() + ", "; } else { displayLabel.Text += "Name=null, "; } // Display the field value contained in the DictionaryEntry object. if (entry.Value != null) { displayLabel.Text += "Value=" + entry.Value.ToString() + "<br/>"; } else { displayLabel.Text += "Value=null<br/>"; } } </script> <html> <body> <form runat="server"> <h3>GridViewDeletedEventArgs Keys and Values Example</h3> <asp:label id="Message" forecolor="Red" runat="server"/> <br/> <!-- The GridView control automatically sets the columns --> <!-- specified in the datakeynames property as read-only. --> <!-- No input controls are rendered for these columns in --> <!-- edit mode. --> <asp:gridview id="CustomersGridView" datasourceid="CustomersSqlDataSource" autogeneratecolumns="true" autogeneratedeletebutton="true" allowpaging="true" datakeynames="CustomerID" onrowdeleted="CustomersGridView_RowDeleted" runat="server"> </asp:gridview> <br/> <asp:label id="KeysMessageLabel" forecolor="Red" runat="server"/> <br/><br/> <asp:label id="ValuesMessageLabel" forecolor="Red" runat="server"/> <!-- This example uses Microsoft SQL Server and connects --> <!-- to the Northwind sample database. Use an ASP.NET --> <!-- expression to retrieve the connection string value --> <!-- from the Web.config file. --> <asp:sqldatasource id="CustomersSqlDataSource" selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]" deletecommand="Delete from Customers where CustomerID = @CustomerID" connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" runat="server"> </asp:sqldatasource> </form> </body> </html>

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。


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