Error : Type Argument 'TChannel' Does Not Inherit From Or Implement The Constraint Type 'System.ServiceModel.Channels.IChannel'

Apr 8, 2010

I have the below lines of code :I am getting the error as mentioned in the Title above.This error has come after converting a C# Code to VB.NET Code which is mentioned below:

C#:
public override IChannelListener<TChannel> BuildChannelListener<TChannel>(BindingContext context)
{
if (context == null)

[code]....

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Generics Compiler Error: Type Argument X Does Not Inherit From Or Implement The Constraint Type Y?

Mar 1, 2012

I've spent quite a bit of time reading up on generics, covariance, etc., and I am failing to understand why I get the aforementioned compiler error in this type of codeLet's say I have a base "Bill" class made up of a collection of Lines..

Public Class Bill(Of L As Line)
Private _lines As List(Of L)
Public Property Lines() As List(Of L)

[code].....

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Entity Framework Error - "Type Argument 'Namespace...EntityName' Does Not Satisfy The 'Class' Constraint For The Type 'TEntity'"

Feb 28, 2011

I have the following two tables defined...

CREATE TABLE [LogLevel] (
[Id] int primary key
,[Name] nvarchar(50) not null

[code]....

After creating a fresh endity model, I add the two tables above. When I try to build I get the following errors...

Type argument 'Inxsol.CommandPlan.Data.Model.Log.LogLevel' does not satisfy the 'Class' constraint for type parameter 'TEntity'.
Value of type 'System.Data.Objects.DataClasses.EntityReference(Of Inxsol.CommandPlan.Data.Model.LogLevel)' cannot be converted to 'System.Data.Objects.DataClasses.EntityReference(Of Inxsol.CommandPlan.Data.Model.Log.LogLevel)'.

[code]....

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Inherit System.Type - Extending Type Class - Various

Jan 15, 2010

i was trying to inherit System.Type. this is what i have:

[Code]...

and anyway the real problem is that inheriting System.Type without declaring my derived class as 'MustInherit

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System.TypeInitializationException: The Type Initializer For 'System.ServiceModel.ClientBase' 1' Threw An Exception

Dec 22, 2009

I'm using express 2008 build the windows app. and in the app, it calls a webservice which was built by VS2003.It works fine on most PCs. however, there is one PC, it always shows this error:

System.TypeInitializationException: The type initializer for 'System.ServiceModel.ClientBase' 1' threw an exception
....
System.configuration.ConfigurationErrorException: Configuration system failed to initialize ---> System.Configuration.ConfigurationErrorsException:
Unrecognized configuration section system.serviceModel
.....

however, the configuration file was generated by express 2008, and it seems there is no error.

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Error : Unable To Cast Object Of Type 'System.EventArgs' To Type 'System.Windows.Forms.KeyPressEventArgs'

May 16, 2011

[URL]The issue is as soon as I change the value of the text boxes it gives me an error and forces me to close the project.

The error is:Unable to cast object of type 'System.EventArgs' to type 'System.Windows.Forms.KeyPressEventArgs'.

However I'm supposed to clear the number of gallons used and the total charged when a change is made to the contents of the 2 text boxes on the form.

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Error Unable To Cast Object Of Type 'System.Data.SqlTypes.SqlDecimal' To Type 'System.IConvertible'

Jun 6, 2011

I have an InvalidCastException Error in my program. The program is that i try to insert an employee record into a database table after getting the details from a form. I've used Money data type is SQL Server for salary and SqlTypes.SqlDecimal data type in employee template class. i've used a stored procedure to pass the values and i add the basic value by passing a parameter by the method

Dim prm8 As SqlParameter = com.Parameters.Add("@basic", SqlDbType.Money)
prm8.Direction = ParameterDirection.Input
prm8.Value = emp.Bsc

I've used the money datatype itself even in the stored procedure variable.I get the following error.

failed to convert parameter value from sql decimal to decimal
Even if i use
prm8.Value = Convert.ToDecimal(emp.Bsc)

I get an error Unable to cast object of type 'System.Data.SqlTypes.SqlDecimal' to type 'System.IConvertible'.

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Ado.net Error (Unable To Cast Object Of Type 'System.String' To Type 'System.Data.IDataReader'.)?

Jan 29, 2012

I am getting this error when I am tring to load string type to data table)

Using connection As New SqlConnection("connectionstring;")
connection.Open()
Using Command As New SqlCommand("SELECT ClientId,forename,surname from t_clientdetails

[code].....

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ASP.Net Error - Unable To Cast Object Of Type 'System.String' To Type 'System.Data.DataTable'

Oct 4, 2009

I get the below error Unable to cast object of type 'System.String' to type 'System.Data.DataTable'.This is the code I'm using

Dim str As String = String.Empty
If (Session("Brief") IsNot Nothing) Then
Dim dt As DataTable = Session("Brief")
If (dt.Rows.Count > 0) Then

[code]....

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Error - Unable To Cast Object Of Type 'AbstractListlistIterator' To Type 'System.Collections.IEnumerator

Dec 22, 2010

I have a series of API calls that are returning J# data types. I have been able to convert most of the data types (Integer, Boolean, Double, Float, etc) just fine.What I need to do now is convert a java.Util.Collection to a VB .NET collection (ArrayList)

Here is my attempt:

Public Function MakeDotNETCollection(ByVal javaCol As java.util.Collection) As Collection
Dim dotNetCol As Collection

[code]....

I keep getting a runtime error "Unable to cast object of type 'AbstractListlistIterator' to type 'System.Collections.IEnumerator.

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VS 2008 : Error - Unable To Cast Object Of Type 'ObjectCollection' To Type 'System.Array'

Feb 24, 2012

I am using a background worker and am attempting to use the following code. However I keep getting this error on i "Unable to cast object of type 'ObjectCollection' to type 'System.Array'."

Private Sub btnVerify_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnVerify.Click
myArray = listProxies.Items()
BackgroundWorker1.RunWorkerAsync()
End Sub

[code]....

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Upgrade From 2003 To 2010 Error "System.SystemException - The Type Library Importer Encountered An Error During Type Verification"

Aug 25, 2011

I've just finished installing VS2010 on my computer. I have a project I built in 2003 that I'm trying to open in 2010. It went through the conversion process and generated this error: System.SystemException - The type library importer encountered an error during type verification. Try importing without class members. : System.MissingMethodException - Method not found: 'Void

[Code]...

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Error : Unable To Cast The COM Object Of Type 'System._ComObject' To Interface Type 'Microsoft.Office.Interop.Word.CustomProperties'

May 10, 2009

I have been trying to use vb2008 to automatically update CustomDocumentProperties fields that I have set up within a pro-forma document. I can load the Word application and word document without problems.I want to update the CustomDocumentProperties fields with data read from a dB. To do this I am assuming that I need to iterate through the CustomDocumentProperties fields within the word document and when one is "found" that matches the data I wish to merge then assign the dB value to the field.The problem is that I am getting an exception error when I try to reference the document customdocumentproperties

"Error : Unable to cast the COM object of type 'System._ComObject' to interface type 'Microsoft.Office.Interop.Word.CustomProperties'. ...... "

my code looks like;

Dim WordApp As Word._Application
Dim odoc As Word._Document
Dim BContinue As Boolean = True

[code].....

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Can't Copy Paste Cut Code - Gives Error "Unable To Cast Object Of Type 'Public_Information_System_Remake.PIS' To Type System.Windows.Forms.TextBox"

Mar 31, 2011

same errors or something related to System.windows.forms. Unable to cast object of type 'Public_Information_System_Remake.PIS' to type 'System.Windows.Forms.TextBox'.

[Code]...

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Unable To Cast Object Of Type 'System.Collections.Generic.List`1[System.Int32]' To Type 'crmWebService.ArrayOfInt'?

May 14, 2012

I'm getting an error after sending a list to a web service.This is the code that is calling the web service:

Dim sProgramInterest As New List(Of Integer)
crmService.InsertProspectGetId(sProgramInterest.ToList)
But I'm getting this error.

[code].....

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VS 2010 Unable To Cast Object Of Type 'System.Windows.Forms.MouseEventArgs' To Type 'System.ComponentModel.RunWorkerCompletedEventArgs'

Jun 25, 2010

My project worked a first and now its giving me a problem.The error

Quote:

Unable to cast object of type 'System.Windows.Forms.MouseEventArgs' to type 'System.ComponentModel.RunWorkerCompletedEventArgs'.

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Forms :: Display Picture In Picturebox1 - Shows This Message, Unable To Cast Object Of Type 'System.DBNull' To Type 'System.Byte[]'?

Dec 24, 2009

Now I want to display picture in picturebox1.To do this I use this codes, but it does not display picture

on this line: Dim arrPicture() As Byte = CType(dt2.Rows(0)("img_path"), Byte())

it shows this message,

Unable to cast object of type 'System.DBNull' to type 'System.Byte[]'.[code]......

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Unable To Cast Object Of Type 'System.String' To Type 'System.Windows.Forms.TextBox'

Jun 12, 2011

Unable to cast object of type 'System.String' to type 'System.Windows.Forms.TextBox'.

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IDE :: DataGridView1_CellLeave(sender, New System.EventArgs), Unable To Cast Object Of Type 'System.EventArgs' To Type 'System.Windows.Forms.DataGridViewCellEventArgs'.

Jun 27, 2011

VB 2008, DataGridView,DataGridView1_CellLeave(sender, New System.EventArgs)

"Unable to cast object of type 'System.EventArgs' to type 'System.Windows.Forms.DataGridViewCellEventArgs'."

What is the Correct String for "New System.EventsArgs"

Anybody there is to help me out.

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Asp.net - Unable To Cast Object Of Type 'System.Web.UI.WebControls.Label' To Type 'System.IConvertible'

May 2, 2012

I'm creating a student evaluation form in a repeater that should submit the evaluation responses and update the SQL database, but I keep getting the error mentioned in the title. I'm coding in ASP.Net using VB.

Here's my code:

Student.aspx
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="Server">

[Code].....

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LINQ To SQL: Unable To Cast Object Of Type 'System.Guid' To Type 'System.String'

Nov 15, 2011

I am getting a really bizarre error and it makes no sense at all.Basically I have a user entity which has a Password property. This property is of Type Binary, the server data type being Binary(512).I am reading this value in and converting it to a byte array. However whenever I run my code I am getting a completely unrelated error of Unable to cast object of type 'System.Guid' to type 'System.String'.This strikes me as very odd since I am not using a property or variable of type string or GUID anywhere in this procedure where it falls over.

The code is below:

Public Shared Function ValidateUser(ByVal username As String, ByVal password As String) As UserValidationMessage
Using db As New EntityMapDataContext
Dim u = From user In db.Users
Where user.Username = username

[code]....

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Unable To Cast COM Object Of Type 'System.__ComObject' To Class Type 'System.Xml.XmlNode'

Jul 30, 2009

Code: Dim dom As New DOMDocument30 dom.async = False
dom.Load(serverAddress & "/App/filelist.jsp?type=content")
For i = 0 To dom.childNodes.item(1).childNodes.length - 1 downloadfile(dom.childNodes.item(i), mcount, currentpath) Next

The above code is activated upon clicking of a button. i have the server address declared. and using the domdoc to load the jsp file to generate the xml data. and using for loop, i call the download file function which accepts the following parameters

Code:Public Sub downloadfile(ByVal domdoc As Xml.XmlNode, ByVal totalcount As Integer, ByVal currentpath As String)

The totalcount and currentpath work fine, but when i pass in the dom.childNodes.item(i) , error pops up.

--------------------error message------------------------------------------Unable to cast COM object of type 'System.__ComObject' to class type 'System.Xml.XmlNode'. Instances of types that represent COM components cannot be cast to types that do not represent COM components; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface.-------------------------------------------------------------------------------

[code]....

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Unable To Cast Object Of Type 'System.String' To Type 'System.IFormatProvider' Exception

Aug 7, 2011

When testing the followng code from Mastering VB2010, I get an Unable to cast object of type 'System.String' to type 'System.IFormatProvider' exception.In the Button1_Click event code Dim strmOut As New System.IO.StringWriter(SaveFileDialog1.FileName)the 'SaveFileDialog1. FileName' is underlined with a green squiggle and displays the following tool tip:Runtime errors might occur when converting 'String' to'System. Iformat Provider'.This is apparrently the problem but what does it mean and how do I fix it to get the code to work? 'Code being tested that runs the exception:Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click.[code]

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Unable To Cast Object Of Type 'System.String' To Type 'System.Web.UI.WebControls.Label'

Jun 6, 2011

I have a page that get value from SQL. I'm having a problem when I initialize Label object with field having TEXT data type.[code]...

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VS 2008 Unable To Cast Object Of Type 'System.String' To Type 'System.IFormatProvider'

Oct 20, 2010

I have a bit of trouble right here, I am trying to get the data from the site and input them in the listview. Well, when my main app start to load through on debug, then it start to display a warning. The warning is: Unable to cast object of type 'System.String' to type 'System.IFormatProvider'.

[Code]...

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Sql Server - Assign The Value I Queried To A String Which Is An Argument In A Procedure If The Argument's Data Type Is An Object?

Dec 5, 2011

I made this procedure re-use a select query:

[code..]

And I use it like this if I would want the selected value placed in a textbox and it works fine

[code...]

However if I want the value to be passed in a string like so:

[code...]

The string ends up having an empty string value. How do I assign the value I queried to that String?

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.net - Unable To Cast Object Of Type 'System.Int32' To Type 'System.String'?

Mar 20, 2012

I'm getting a sporadic 'Unable to cast object of type 'System.Int32' to type 'System.String' Exceptions at .SingleorDefault() in the below code. It works 9/10 times but randomly it throws an exception. I made sure that SettingID that i'm passing has no Null Values and the data in the table always exists for the settingID, and i'm always passing SettingID as Integer.

[Code]...

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Cast Object Of Type 'System.Byte[]' To Type 'System.Drawing.Image'?

Mar 15, 2010

I am using VB2008 in VS Prof and try to convert at Byte arry stored as a Image format in Sql2000 database.

Code:
Using acnLoc As New SqlConnection(CSLoc)
acnLoc.Open()
Dim G As SqlCommand = New SqlCommand("SELECT [SignatureData] FROM [MyTable] where [OID]=@OID", acnLoc)
G.Parameters.Add("@OID", SqlDbType.Int).Value =Cint(bxShipmentno.Text.Trim())
dim P= G.ExecuteScalar() 'returns a system arry

[Code]...

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FTP - Unable To Cast Object Of Type 'System.Net.FileWebRequest' To Type 'System.Net.FtpWebRequest'

Jun 6, 2012

[Code]...

Unable to cast object of type 'System.Net.FileWebRequest' to type 'System.Net.FtpWebRequest'.

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Unable To Cast Object Of Type 'System.Byte[]' To Type 'System.IConvertible'

Jun 5, 2010

i get the error in following code

Function ReadFile(ByVal sPath As String) As Byte
Dim data As Byte
data = Nothing

[Code].....

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