UserControl.SaveViewState Method
Definition
Important
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Saves any user control view-state changes that have occurred since the last page postback.
protected:
override System::Object ^ SaveViewState();
protected override object SaveViewState ();
override this.SaveViewState : unit -> obj
Protected Overrides Function SaveViewState () As Object
Returns
Returns the user control's current view state. If there is no view state associated with the control, it returns null
.
Examples
The following example demonstrates a user control that manages its view state using the LoadViewState and SaveViewState methods.
public string UserText
{
get
{
return (string)ViewState["usertext"];
}
set
{
ViewState["usertext"] = value;
}
}
public string PasswordText
{
get
{
return (string)ViewState["passwordtext"];
}
set
{
ViewState["passwordtext"] = value;
}
}
[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]
protected override void LoadViewState(object savedState)
{
object[] totalState = null;
if (savedState != null)
{
totalState = (object[])savedState;
if (totalState.Length != 3)
{
// Throw an appropriate exception.
}
// Load base state.
base.LoadViewState(totalState[0]);
// Load extra information specific to this control.
if (totalState != null && totalState[1] != null && totalState[2] != null)
{
UserText = (string)totalState[1];
PasswordText = (string)totalState[2];
}
}
}
[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]
protected override object SaveViewState()
{
object baseState = base.SaveViewState();
object[] totalState = new object[3];
totalState[0] = baseState;
totalState[1] = user.Text;
totalState[2] = password.Text;
return totalState;
}
Public Property UserText() As String
Get
Return CStr(ViewState("usertext"))
End Get
Set(ByVal value As String)
ViewState("usertext") = value
End Set
End Property
Public Property PasswordText() As String
Get
Return CStr(ViewState("passwordtext"))
End Get
Set(ByVal value As String)
ViewState("passwordtext") = value
End Set
End Property
<System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
Protected Overrides Sub LoadViewState(ByVal savedState As Object)
Dim totalState As Object() = Nothing
If Not (savedState Is Nothing) Then
totalState = CType(savedState, Object())
If totalState.Length <> 3 Then
' Throw an appropriate exception.
End If
' Load base state.
MyBase.LoadViewState(totalState(0))
' Load extra information specific to this control.
If Not (totalState Is Nothing) AndAlso Not (totalState(1) Is Nothing) AndAlso Not (totalState(2) Is Nothing) Then
UserText = CStr(totalState(1))
PasswordText = CStr(totalState(2))
End If
End If
End Sub
<System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
Protected Overrides Function SaveViewState() As Object
Dim baseState As Object = MyBase.SaveViewState()
Dim totalState(2) As Object
totalState(0) = baseState
totalState(1) = user.Text
totalState(2) = password.Text
Return totalState
End Function
End Class
Remarks
In general, you do not need to call this method. However, if you store custom information in view state, you can override this method to do so.
Applies to
See also
.NET
피드백
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