ViewStateException.UserAgent Property
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Gets the browser type of the HTTP request that resulted in a view-state exception.
public:
property System::String ^ UserAgent { System::String ^ get(); };
public string UserAgent { get; }
member this.UserAgent : string
Public ReadOnly Property UserAgent As String
A String containing the user agent, which is typically the browser type.
The following code example demonstrates how to implement a method that deserializes a base64-encoded string and returns an ICollection collection of property settings. The Deserialize method can throw an HttpException exception that contains a ViewStateException object as an inner exception. The example shows how you can catch an HttpException exception and retrieve the properties from the ViewStateException object.
private ICollection LoadControlProperties(string serializedProperties)
{
ICollection controlProperties = null;
// Create an ObjectStateFormatter to deserialize the properties.
ObjectStateFormatter formatter = new ObjectStateFormatter();
try
{
// Call the Deserialize method.
controlProperties = (ArrayList)formatter.Deserialize(serializedProperties);
}
catch (HttpException e)
{
ViewStateException vse = (ViewStateException)e.InnerException;
String logMessage;
logMessage = "ViewStateException. Path: " + vse.Path + Environment.NewLine;
logMessage += "PersistedState: " + vse.PersistedState + Environment.NewLine;
logMessage += "Referer: " + vse.Referer + Environment.NewLine;
logMessage += "UserAgent: " + vse.UserAgent + Environment.NewLine;
LogEvent(logMessage);
if (vse.IsConnected)
{
HttpContext.Current.Response.Redirect("ErrorPage.aspx");
}
else
{
throw e;
}
}
return controlProperties;
}
Private Function LoadControlProperties(ByVal serializedProperties As String) As ICollection
Dim controlProperties As ICollection = Nothing
' Create an ObjectStateFormatter to deserialize the properties.
Dim formatter As New ObjectStateFormatter()
Try
' Call the Deserialize method.
controlProperties = CType(formatter.Deserialize(serializedProperties), ArrayList)
Catch e As HttpException
Dim vse As ViewStateException
Dim logMessage As String
vse = e.InnerException
logMessage = "ViewStateException. Path: " + vse.Path + Environment.NewLine
logMessage += "PersistedState: " + vse.PersistedState + Environment.NewLine
logMessage += "Referer: " + vse.Referer + Environment.NewLine
logMessage += "UserAgent: " + vse.UserAgent + Environment.NewLine
LogEvent(logMessage)
If (vse.IsConnected) Then
HttpContext.Current.Response.Redirect("ErrorPage.aspx")
Else
Throw e
End If
End Try
Return controlProperties
End Function 'LoadControlProperties
This property returns the same value as the HTTP_USER_AGENT
variable in the ServerVariables property.
Product | Versions |
---|---|
.NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
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