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POUnable to cast object of type X to type X
 

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  1. POUnable to cast object of type X to type X
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    <p>Users randomly get "Unable to cast object of type "X" to type "X" exception error. Sometimes this issue will happen a few times a day. Sometime we can go a week+ w/o it coming up. </p> <p>I have an serialized object ("X") that I populate in a list "CurrentDetails" &amp; "NextDetails" as "X". On a text change event, I check for a value in "CurrentDetails" at which point the exception fires. "Unable to cast object of type X to type X" Here are a few code samples... </p> <p>Text Change Event (Edited to show raw data)</p> <pre><code>Protected Sub txtPackaging_TextChanged(sender As Object, e As System.EventArgs) Handles txtPackaging.TextChanged If WarehouseManager.GetDeliveryStatus(CurrentSUPPDelivery.DeliveryNumber) &gt; 60 Then 'GETTIGN ERROR HERE Unable to cast object of type 'SUPPDelivery' to type 'SUPPDelivery' 'THROW ERROR SetErrorMessage("&lt;b&gt;REFRESH/BACK DETECTED!&lt;/b&gt; &lt;br/&gt; Or, this item has already been packed. &lt;br/&gt; Please exit wave.") pnlItemDetails.Visible = False pnlCurrent.Visible = False pnlWaveDetails.Visible = False Else 'continue pick/pack btnProcessSingleItem_Click(sender, e) End If End Sub </code></pre> <p>View State Object (Edited to show raw data)</p> <pre><code>Private Property CurrentSUPPDelivery() As WarehouseManager.SUPPDelivery Get Return Me.ViewState("CurrentSUPPDelivery") End Get Set(ByVal value As WarehouseManager.SUPPDelivery) Me.ViewState("CurrentSUPPDelivery") = value End Set End Property </code></pre> <p>It is throwing an error on the IF statement of the txtChange event. Any ideas? </p> <p>EDIT: Raw Stack Data....</p> <blockquote> <p>Stack trace: at Warehouse_SingleUnitPickPack.get_CurrentSUPPDelivery() in C:\Inetpub\lawsonwebapps\warehouse\mobile\SingleUnitPickPack.aspx.vb:line 107 at Warehouse_SingleUnitPickPack.txtPackaging_TextChanged(Object sender, EventArgs e) in C:\Inetpub\lawsonwebapps\warehouse\mobile\SingleUnitPickPack.aspx.vb:line 249 at System.Web.UI.WebControls.TextBox.OnTextChanged(EventArgs e) at System.Web.UI.WebControls.TextBox.RaisePostDataChangedEvent() at System.Web.UI.WebControls.TextBox.System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent() at System.Web.UI.Page.RaiseChangedEvents() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)</p> </blockquote> <p>EDIT: "X" - Manager.CurrentDetails ... RAW Name:SUPPDelivery </p> <pre><code>&lt;Serializable()&gt; Public Class SUPPDelivery Private _DeliveryNumber As String Private _OrderNumber As String Private _OrderLine As String Private _TransactionType As String Private _PackedQty As String Private _PackageNumber As String Private _PackageMaterial As String Private _OrderLineSuffix As String Private _ItemNumber As String Private _ItemLocation As String Public Property DeliveryNumber() As String Get Return _DeliveryNumber End Get Set(ByVal value As String) _DeliveryNumber = value End Set End Property Public Property OrderNumber() As String Get Return _OrderNumber End Get Set(ByVal value As String) _OrderNumber = value End Set End Property Public Property OrderLine() As String Get Return _OrderLine End Get Set(ByVal value As String) _OrderLine = value End Set End Property Public Property TransactionType() As String Get Return _TransactionType End Get Set(ByVal value As String) _TransactionType = value End Set End Property Public Property PackedQty() As String Get Return _PackedQty End Get Set(ByVal value As String) _PackedQty = value End Set End Property Public Property PackageNumber() As String Get Return _PackageNumber End Get Set(ByVal value As String) _PackageNumber = value End Set End Property Public Property PackageMaterial() As String Get Return _PackageMaterial End Get Set(ByVal value As String) _PackageMaterial = value End Set End Property Public Property OrderLineSuffix() As String Get Return _OrderLineSuffix End Get Set(ByVal value As String) _OrderLineSuffix = value End Set End Property Public Property ItemNumber() As String Get Return _ItemNumber End Get Set(ByVal value As String) _ItemNumber = value End Set End Property Public Property ItemLocation() As String Get Return _ItemLocation End Get Set(ByVal value As String) _ItemLocation = value End Set End Property End Class </code></pre>
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    1. USJumpingJezza
    1. USjharris8567
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      1. POUnable to cast object of type X to type X
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    1. COCan you see the call stack? If not, I'd fix your application so that it displays or logs the call stack when the exception occurs. That will go a long way towards helping you solve what's happening.
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      1. POUnable to cast object of type X to type X
      1. USSteven Doggart
    2. COThere may be two different `X` types with the same name. Are the servers restarting? Is anything being redeployed? Is there a rogue server running a different version? Is the type `X` in a strongly-named assembly? Is the assembly version number updated on changes? Is `X` defined in a dynamically compiled code?
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    3. COYour setter has a trailing whitespace - is that in your code? `Me.ViewState("CurrentDetails ")`. You've also given a property and a type the same name - could the compiler be having trouble with this? It would help to see what `Manager.GetSomething` looks like, as would a call stack help and knowing what `.TheSomething` is.
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      1. USJ...
 

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