DetailsViewUpdateEventArgs.Keys 속성
정의
중요
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업데이트할 레코드의 키 필드 이름/값 쌍이 포함된 사전을 가져옵니다.
public:
property System::Collections::Specialized::IOrderedDictionary ^ Keys { System::Collections::Specialized::IOrderedDictionary ^ get(); };public System.Collections.Specialized.IOrderedDictionary Keys { get; }member this.Keys : System.Collections.Specialized.IOrderedDictionaryPublic ReadOnly Property Keys As IOrderedDictionary속성 값
IOrderedDictionary 업데이트할 레코드에 대한 키 필드 이름/값 쌍의 사전을 포함하는 값입니다.
예제
다음 코드 예제에서는 업데이트 되는 레코드에 Keys 대 한 키 필드의 값에 액세스 하는 속성을 사용 하는 방법을 보여 줍니다.
<%@ Page language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void CustomerDetailsView_ItemUpdating(Object sender,
DetailsViewUpdateEventArgs e)
{
// Validate the field values entered by the user. This
// example determines whether the user left any fields
// empty. Use the NewValues property to access the new
// values entered by the user.
ArrayList emptyFieldList =
ValidateFields((IOrderedDictionary)e.NewValues);
if (emptyFieldList.Count > 0)
{
// The user left some fields empty.
// Display an error message.
// Use the Keys property to retrieve the key field value.
String keyValue = e.Keys["CustomerID"].ToString();
MessageLabel.Text =
"You must enter a value for all fields of record " +
keyValue + ".<br/>The following fields are missing:<br/><br/>";
// Display the missing fields.
foreach (String value in emptyFieldList)
{
// Use the OldValues property access the original
// value of a field.
MessageLabel.Text += value + " - Original Value = " +
e.OldValues[value].ToString() + "<br />";
}
// Cancel the update operation.
e.Cancel = true;
}
else
{
// The field values passed validation. Clear the
// error message label.
MessageLabel.Text = "";
}
}
ArrayList ValidateFields(IOrderedDictionary list)
{
// Create an ArrayList object to store the
// names of any empty fields.
ArrayList emptyFieldList = new ArrayList();
// Iterate though the field values entered by
// the user and check for an empty field. Empty
// fields contain a null value.
foreach (DictionaryEntry entry in list)
{
if (entry.Value == null)
{
// Add the field name to the ArrayList object.
emptyFieldList.Add(entry.Key.ToString());
}
}
return emptyFieldList;
}
void CustomerDetailsView_ModeChanging(Object sender,
DetailsViewModeEventArgs e)
{
if (e.CancelingEdit)
{
// The user canceled the update operation.
// Clear the error message label.
MessageLabel.Text = "";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewUpdateEventArgs Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewUpdateEventArgs Example</h3>
<asp:detailsview id="CustomerDetailsView"
datasourceid="DetailsViewSource"
autogeneraterows="true"
autogenerateeditbutton="true"
allowpaging="true"
datakeynames="CustomerID"
onitemupdating="CustomerDetailsView_ItemUpdating"
onmodechanging="CustomerDetailsView_ModeChanging"
runat="server">
<pagersettings position="Bottom"/>
</asp:detailsview>
<br/>
<asp:label id="MessageLabel"
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="DetailsViewSource"
selectcommand="Select [CustomerID], [CompanyName], [Address],
[City], [PostalCode], [Country] From [Customers]"
updatecommand="Update [Customers] Set
[CompanyName]=@CompanyName, [Address]=@Address,
[City]=@City, [PostalCode]=@PostalCode,
[Country]=@Country
Where [CustomerID]=@CustomerID"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
<%@ Page language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub CustomerDetailsView_ItemUpdating(ByVal sender As Object, _
ByVal e As DetailsViewUpdateEventArgs)
' Validate the field values entered by the user. This
' example determines whether the user left any fields
' empty. Use the NewValues property to access the new
' values entered by the user.
Dim emptyFieldList As ArrayList = _
ValidateFields(CType(e.NewValues, IOrderedDictionary))
If emptyFieldList.Count > 0 Then
' The user left some fields empty. Display an error message.
' Use the Keys property to retrieve the key field value.
Dim keyValue As String = e.Keys("CustomerID").ToString()
MessageLabel.Text = _
"You must enter a value for all fields of record " & _
keyValue & ".<br/>The following fields are missing:<br/><br/>"
' Display the missing fields.
Dim value As String
For Each value In emptyFieldList
' Use the OldValues property access the original value
' of a field.
MessageLabel.Text &= value & " - Original Value = " & _
e.OldValues(value).ToString() & "<br />"
Next
' Cancel the update operation.
e.Cancel = True
Else
' The field values passed validation. Clear the
' error message label.
MessageLabel.Text = ""
End If
End Sub
Function ValidateFields(ByVal list As IOrderedDictionary) _
As ArrayList
' Create an ArrayList object to store the
' names of any empty fields.
Dim emptyFieldList As New ArrayList()
' Iterate though the field values entered by
' the user and check for an empty field. Empty
' fields contain a null value.
Dim entry As DictionaryEntry
For Each entry In list
If entry.Value Is Nothing Then
' Add the field name to the ArrayList object.
emptyFieldList.Add(entry.Key.ToString())
End If
Next
Return emptyFieldList
End Function
Sub CustomerDetailsView_ModeChanging(ByVal sender As Object, ByVal e As DetailsViewModeEventArgs)
If e.CancelingEdit Then
' The user canceled the update operation.
' Clear the error message label.
MessageLabel.Text = ""
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewUpdateEventArgs Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewUpdateEventArgs Example</h3>
<asp:detailsview id="CustomerDetailsView"
datasourceid="DetailsViewSource"
autogeneraterows="true"
autogenerateeditbutton="true"
allowpaging="true"
datakeynames="CustomerID"
onitemupdating="CustomerDetailsView_ItemUpdating"
onmodechanging="CustomerDetailsView_ModeChanging"
runat="server">
<pagersettings position="Bottom"/>
</asp:detailsview>
<br/>
<asp:label id="MessageLabel"
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="DetailsViewSource"
selectcommand="Select [CustomerID], [CompanyName], [Address],
[City], [PostalCode], [Country] From [Customers]"
updatecommand="Update [Customers] Set
[CompanyName]=@CompanyName, [Address]=@Address,
[City]=@City, [PostalCode]=@PostalCode,
[Country]=@Country
Where [CustomerID]=@CustomerID"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
설명
속성을 Keys 사용하여 업데이트할 레코드의 키 필드 값에 액세스합니다. 예를 들어 이러한 값을 사용하여 업데이트된 레코드의 로그를 유지할 수 있습니다.
이 속성은 Keys 인터페이스를 구현하는 개체를 IOrderedDictionary 반환합니다. 개체는 DictionaryEntry 업데이트할 레코드의 필드를 나타내는 개체를 포함합니다.
메모
바로 가기로 개체의 IOrderedDictionary 인덱서로 필드 값에 직접 액세스할 수도 있습니다.
