Asp.net - MissingMethodException Using Classic ADO's Recordset.Type Property?

Apr 17, 2011

In my ASP.NET app, I'm using classic ADO 2.8 to save some data into an Access database. (Or a Jet database, for those who insist that Access is just the front-end.) So I have a RecordSet containing some data, and I want to set the value for some fields, but first I need to know the field type. So I use the Recordset.Type property:

Dim fieldType = rs("MyField").Type

And that unexpectedly results in an error: MissingMethodException was unhandled by user code -- Error: Missing method 'instance valuetype ADODB.DataTypeEnum [MyProjectName] ADODB.Field::get_Type()' from class 'ADODB.InternalField'.

Considering that it is .NET itself that has created the .NET/COM interop assembly, any idea why?And here's the strangest thing: When the debugger stops and reports the error and takes me to the spot in my code where it happened, and it has that great feature by which you can hover the mouse over any variable etc. and it will show its value -- so I hover over the rs("MyField").Type part, and, lo and behold, it shows the correct value!So if it could evaluate it at debug-time, why did it throw an error at run-time?

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Calling A .NET Function That Requires A .NET Type From Classic ASP?

Aug 3, 2011

I am trying to over come this paoblem from last 2 days But i am not able to overcome.I was able to set up the environment so that I can call .NET method (via COM) from a classic ASP page.Everything actually works as intended until when I have to call a .NET method that requires a .NET type.So I have a method named SetTable Like Below I have a function like this in .Net

Public Sub SetTable(ByVal _City As City, ByVal _Country As Country)
'doing some thing
End Sub

and i have asp code like this:

dim CountryUtil, City, Country
set CountryUtil= Server.CreateObject("mydll.CountryUtil")
set City= Server.CreateObject("mydll.City")

[code]....

' I get this error here:

'Microsoft VBScript runtime error '800a0005' 'Invalid procedure call or argument: 'SetTable'

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RecordSet.Fields: Altering The Data Type?

Mar 15, 2011

I got a DataGrid Control that uses an Adodb.Recordset as a data source. I'd like to change the data type of the dodb.Recordset.Fields at run time. PS:I tried use the Type property but I got a message that it can't perform the operation when the object is open. Then I tried closing it with Close() but then it says the field is not available.

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Get A Property Name For A Type Without The Need To Instantiate An Object Of That Type?

May 15, 2012

I have a requirement where I need to have a "type safe" way of accessing property names, without actually instantiating an object to get to the property. To give an example, consider a method that takes as arguments a list of IMyObject and a string that represents a property name (a property that exists in IMyObject).

The methods implementation will take the list and access all the objects in the list using the property name passed... for some reason or another, we won't dwell on that!!

Now, I know that you can do this using an instantiated object, something like ...

Dim x as MyObject = nothing
Dim prop As PropertyInfo = PropHelper.GetProperty(Of MyObject)(Function() x.MyProperty)

Where my helper method uses reflection to get the name of the property as a string - there are numerous examples of this flying around on the web!

But I don't want to have to create this pointless object, I just want to do something like MyObject.MyProperty! Reflection allows you to iterate through a types properties and methods without declaring an object of that type... but I want to access a specific property and retrieve the string version of its name without iteration and without declaring an object of that type!

The main point here is that although I am trying to get the property name as a string... this is done at run time... at compile time, I want this to be type safe so if someone changes the property name, the compilation will break.

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System.MissingMethodException: Method Not Found?

Jan 2, 2012

I am getting an error when I try and run my service. I made sure everything in the project is VB .NET 2.0.This service used to work, but we have been making code updates... I did some research but I do not see anything relevant. Does this error mean that my function cause the issue? Or is it the List that is the issue?

[Code]...

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Invoking A Method Via Reflection Causes System.MissingMethodException?

Dec 5, 2011

I am loading an assembly dynamically and invoking a static method from it. The problem arises when the method uses a reference which is not trivial (e.g. mscorlib or System.Core) - I get System.MissingMethodException. I have tried going through the references assemblies of the loaded assembly and manually loading them all, thus forcing them to be loaded onto the AppDomain. I have checked CurrentDomain.GetAssemblies, the assemblies are loaded.

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System.MissingMethodException Occurring On A Method Which Exists

Mar 9, 2009

I am targetting framework 3.5 using a OneClick Deployment, code and packaging done in Visual Studio 2008 Standard Edition.I have code which works in my debug environment, and when installed on the development machine. It also works on one other machine. However, three other machines are throwing exceptions.The situation throwing the exception is that I have a serial port I am accessing, which is open, and which has been successfully opened. I then try to close the port using the following

[Code]...

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ADODB Recordset To ADO.Net Recordset?

Jul 15, 2009

How do you change an ADODB recordset to ADO.Net recordset?

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Get A Property Value If Don't Know The Type Of A Control?

Feb 8, 2010

I have inherited a vb6 app that I am trying to upgrade to VB2008.

If I can find out that a control has a ToolTipText property as below, how can I get the value?

For
Each ctl In frm.Controls
If Not (ctl.GetType().GetProperty("ToolTipText") Is Nothing) Then

[Code].....

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Use Property Type In Expression?

Feb 16, 2010

I have a function which creates a different type of expression depending on the value of the variable passed in.[code]...

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Data Type As A Class Property?

Dec 16, 2011

I have a "generic" Tag class which holds an ItemValue, which at this time is declared as Object. The ItemValue could be one of several datatypes; String, Boolean, Integer, etc. Is there a way to create a class property to identify which data type the Tag is?

I've tried this but it's not working;

Public Property DataType As Type
Get
Return m_DataType

[code]....

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How To Check If A Property Type Is An Interface

Feb 12, 2009

I would like to check if a property's type is an interface (not a specific interface, but any interface).

dim __PropertyInfo As PropertyInfo
dim b as boolean = isinterface(__PropertyInfo)

[code].....

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Implementing An Interface With A Different Property Type?

Mar 1, 2010

I'm currently trying to create a class that is a composition of the SqlDataAdapter class (as unfortunately you can't inherit from it). In order to try and make it as similar as possible I'm using all the same inherits and interfaces as is documented on MSDN.The problem that I am having is that there are some properties where the interface specifies that the type of the property is IDbCommand. But in the SqlDataAdapter the property type is SqlCommand.

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Set Up Filter Property To Look For More Than One File Type

Jan 23, 2009

how to set up the filter property to look for more than one file type? msdn says we can set the filter to '*.*' or *.txt' etc, but doesn't say how to specify more than one type.I've tried a pipe delimited string but it didn't seem to work e,g '*.txt |*.log|*.xml'.

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Converting A String Variable To A Property Type

Aug 28, 2009

I have in my My.Settings four settings [code] now I want to get the value of the current setting from the My.Settings.SettingName. [code]

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Get A Property To Access Its Own Name And Type At Runtime Using Reflection?

Mar 12, 2010

Is there a way for a property to access its own name and type at runtime using reflection? I want to access this info without hard coding the name or index of the property in the class.

Simple Example Code:

Private ReadOnly Property MyProperyName() As String
Get
Console.WriteLine((Get Current Property Info).Type.ToString)
Console.WriteLine((Get Current Property Info).Name)

[code]....

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Set Property Values At Runtime By Control Type?

Feb 21, 2010

I thought I saw how to do this but can't seem to find it now.Is there a way to set the properties of all controls on a Form by Control Type?Meaning, if I have 5 textboxes on a form can I write code like .If page.contol is TextBox then

textbox.forecolor = Blue

Then when the page loads is sets all the textboxes forecolor on the form to Blue.

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Use Property Grid In A Form To Edit Any Type?

Jul 22, 2009

I have an App where I'd like to be able to edit any type (font, colour, point etc.) at run time and use any of the .Net default type editors. (e.g., font/ colour picker).

Rather than re-invent the wheel, I decided to use the property grid control.

If I pass an object of, say font, to the grid, it lists all the fields separately, with no option to open the font picker.[code]...

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Asp.net - Reference Property Of An Unknown Type In Lambda Function

May 18, 2011

I'm trying to create a generic function to build a Linq expression from a list of Telerik grid filters. I'm trying to stay clear of dynamic Linq. Because I don't know the type that I'm building the expression for, I'm attempting to use reflection in the lambda functions to refer to a property, but after applying the fix suggested by @JaredPar I get the error, "The LINQ expression node type 'Invoke' is not supported in LINQ to Entities." Is there any way around this? here is my code:

Public Shared Function buildRadFilter(Of T)(ByVal filterExpression As List(Of GridFilterExpression)) As Expressions.Expression(Of Func(Of T, Boolean))
Dim returnPred = PredicateBuilder.True(Of T)()

[Code]....

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C# - Add A Service To The Type Descriptor Context Of A Property Grid In .Net?

Apr 13, 2010

I have an app that allows the user to choose an image, at design time, either as a straight image, or from an image list.

All cool so far, except that this is not happening from the visual studio property browser, its happening from a property grid that is a part of a type editor.

My problem is, both the image picker (actually resource picker), and the imagelist type converter rely on some design-time services to get the job done. In the case of imagelist, its the IReferenceService and in the case of the resource picker its a service called _DTE.

In the first instance of an edit from the visual studio property browser, I could get a reference to these services but (1) how can I add them to the type descriptor context of my property grid?

It would be better, for future proofing, if I could just copy a reference to all of the services in the type descriptor context. (2) Where does the property browser get these services from in the first place?

ETA: I still don't know how to do it, but I now know it is possible.

(1) Sub-class control and add a property whose type is an array of buttons.

(2) Add it to a form.

(3) Select the new control on the design service and edit the new property in the property browser.

(4) The collection editor dialog pops-up

(5) Add a button

(6) Edit image and image list - the type editor and type converter, respectively, behave as they should.

ETA2: Ok, I'm getting warm. It looks like you do it through the Site property of the property grid. I can create a new site, and pass it the type descriptor context I have a reference to and then it should have all the service. I'll give it a go ...

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Get Notified When List Of Custom Type Property Changed?

Mar 2, 2011

I have a class and one of the properties is a list of a custom class. The caller gets the list and is adding instances of class to the list. How do I get notified that the list has been updated?

Private _list as List(of MyType)
Private _totalField1 as Integer
Public Property MyTypeList As List(Of MyType)
Get
Return _list
End Get
Set(ByVal value As List(Of MyType))
_list= value
_totalField1 = _list.Sum(Function(x) x.Field1)
End Set
End Property

What I'm trying to do is every time a MyType object is added to the list keep a running total of Field1, but adding to the list doesn't use the setter. How can I know when the list has been added or changed?

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.net - ASP.Net MissingMethodException - "ctor" Method Not Found?

Jun 9, 2009

We are getting intermittent problems on a production server that we cannot recreate.There are two very strange things about the issue. Firstly it's a method not found error on the constructor (ctor) for an exception handling helper class and secondly we have custom errors switched on for remote users and this property is being ignored.

[Code]...

It has proven difficult to get information out of the team responsible for the production servers but I have managed to find out that as far as load balancing is concerned, this site is currently only running on one server (this can be made to switch over onto another if necessary). Given that this is an intermittent problem and there is only one server involved, then I find it difficult to believe that this could be an assembly issue. Surely if it was then the problem would occur every time?

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.net - Getting Base Field Type When Databinding To A Decimal (or Object) Property?

May 28, 2012

I've got a custom NumericEditor control that has a nullable Decimal property called Value. When I bind a data field to Value, I'd like to retrieve the underlying Type of the data that's bound, so that I can restrict the use of decimal places if the source field is an integral data type.I figure I'd have to do this in the BindingContextChanged event, but how do I get the Type of the data field from the binding itself? My Google-Fu is failing me at the moment.

In short, I'm looking for something like the GetValueType method mentioned in the following question: Simple databinding - How to handle bound field/property change. Winforms, .Net I imagine this method would also be handy if the Value property was an Object.

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.net - Test If Property Of Type System.Collections.Generic.List(of T)?

Apr 10, 2012

I need to be able to tell if a property is of type List(of T)but am currently unable to. if i do

TypeOf (UpdateTo.GetType.GetProperty(node.Name)) Is System.Collections.Generic.List(Of Object)

I get the following error

TypeOf (UpdateTo.GetType.GetProperty(node.Name)) Is
System.Collections.Generic.List(Of Object) Expression of type
'System.Reflection.PropertyInfo' can never be of type[code]......

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C# - Serializing A Dataset To A Strongly Type Business Object Property?

Nov 14, 2009

In a vb .net winforms app I am trying out something for "wide and shallow" children of a record. I use strongly typed business objects ( Strataframe ).My plan is to have a number of "child tables" collected in a dataset I drop on the form. they have no correspondence in persisted data, so the dataset is untyped and I am creating the schema through the property sheet for the tables. Each table is the datasource for a datagridview in the interface.

In my proof of concept sample, My main businessobject (CustomerBO) interacts with a SQL Server 2008 table with fields - pk, name, - and a third column which is currently varchar(max) as I considered XML but could just as easily be varbinary(max) if that works better for holding the serialized dataset.

bo.bigfield will be the strongly typed prop I want to hold the byte() array or XML or whatever that represents the dataset for that record.So, the question in a nutshell - how do I convert a dataset to a single datum and reproduce the dataset from that datum. This is my first foray into datasets, datagridviews as well so if there are better ways to accomplish any of that I'm listening.

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Class - .NET - Automatically Initialize Extended Property Of Type Object?

Feb 15, 2012

I am building a code behind page that has a public property (MyDTOItem) which is essentially a DTO object (dtDTOItem) Note: In my code the Get and Set are actually real code (I stripped it for the example).The problem I am having is in the Page_Load event. When I set the .Member1 property of the DTO object the Get code runs and not the Set and therefore the DTO ibject property .Member1 never gets assigned. I figured out that if I add code (MyDTOItem = New dtDTOItem) to the Page_Load event then it will set the value correctly. What I am trying to figure out is how to initialize the property object without having to do it explicitly. It has to be an extended property because I have custom Get and Set code.

Public Property MyDTOItem As dtDTOItem
Get
End Get
Set(value As dtDTOItem)

[code]....

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Class - Automatically Initialize Extended Property Of Type Object?

Jun 5, 2006

I am building a code behind page that has a public property (MyDTOItem) which is essentially a DTO object (dtDTOItem) Note: In my code the Get and Set are actually real code (I stripped it for the example).

The problem I am having is in the Page_Load event. When I set the .Member1 property of the DTO object the Get code runs and not the Set and therefore the DTO ibject property .Member1 never gets assigned.

I figured out that if I add code (MyDTOItem = New dtDTOItem) to the Page_Load event then it will set the value correctly. What I am trying to figure out is how to initialize the property object without having to do it explicitly. It has to be an extended property because I have custom Get and Set code.

Public Property MyDTOItem As dtDTOItem
Get
End Get

[code]....

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Does Visual Basic Have A Property For Text Boxes That Allow To Type Right To Left

Jul 28, 2009

I am writing a math game for my brother in Visual Basic to help him with double digit numbers(both adding and subtracting).Normally you solve a problem by writing right to left on a piece of paper. Is there any way of setting the text box to do this?

For Example:

58
+ 18

You would type in the text box '6' followed by '7' so it would read '76'I set the right to left property but it does not do what I want it to do.

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Get The Error No Property Or Field 'John' Exists In Type 'xUser'?

Nov 15, 2011

My LINQ query is as follows

Dim Query = From t In New XPQuery(Of xUser)(Xpo.Session.DefaultSession)
.Where("Name=John").Select("new (Name as FirstName)")

Unfortunately i get the error No property or field 'John' exists in type 'xUser'.Of course no such property exists in my xUser class, but hot can i fix that?After reading within the DynamicLinq Class i found this function

Function FindPropertyOrField(ByVal type As Type, ByVal memberName As String, ByVal staticAccess As Boolean) As MemberInfo
Dim flags As BindingFlags = BindingFlags.Public Or BindingFlags.DeclaredOnly Or _
If(staticAccess, BindingFlags.Static, BindingFlags.Instance)[code]...

How can i edit my "faulty" query? What am i doing wrong here?

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How To Use The Vb Equivalent Of ++ For An Index Property In A Linq Query Projecting A New Type

May 3, 2011

I'd normally do this in C# but since I've got to get this code in this particular assembly which is a vb.net one, I'm stuck.

Here's my linq query:

Dim i As Integer = 0

Dim oldAndCurrentIntersectionOnNames = From currentApplicant In currentApplicants _
Group Join oldApplicant In oldApplicants _

[CODE]...

You'll see the .Index = i+=1

This was my attempt to do what I'd quite happily do in C# (i.e. Index = i++) in VB. Unfortunately the VB compiler doesn't like that. how I'd do this in VB.

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