Input Box Cannot Be Indexed - No Default Property Error
Apr 26, 2012
I am newer in VB NET.
VB code:
Public Class InputBox
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim a, b, S, p
a = InputBox("Enter length")
b = InputBox("Enter width")
S = a * b
p = a + a + b + b
End Sub
End Class
In InputBox lines i get this error:
Class 'LearningVB.InputBox' cannot be indexed because it has no default property.
<AcceptVerbs(HttpVerbs.Post)> _ Function Widget(ByVal collection As FormCollection) As ActionResult ... If ... Then
[code]....
I upgraded to ASP.NET MVC 2 Beta and ASP.NET MVC 2 Futures Assembly for Beta and now ToValueProvider() fails with this compile-time error: Interface 'System.Web.Mvc.IValueProvider' cannot be indexed because it has no default property How do I use ModelState.SetModelValue() if not with collection.ToValueProvider()?
I am new to classes, and I am new to Visual Basic in general, but I am working on a multi class program. The code seems to be correct, but I am trying on instantiate a class oject with the code:
I am getting a strange error when I try to build my solution. The error occurs when I am calling the oGetHeaderValue function and passing the parameters.
Dim oGetHeaderValue As New clsGetHeaderValue Dim returnString As String returnString = oGetHeaderValue(strInvoiceNumber, strOrderNumber)
The error message is: Class 'clsGetHeaderValue' cannot be indexed because it has no default property.
[code]This is my Code the error is Class 'System.data.datatable' cannot be indexed because it has no default property.. When i try this code in oledb it works but here it wont..
I'm having a few problems converting some code into VB.NET from C#. Most of the translating is done, but I am getting errors when I try to run my code, and I can't figure out what is causing them. Here is the Sub I translated.
Public Sub CreateWidget() Dim blue As LCDColor blue.Red = 0 blue.Green = 0
[code]....
The error I receive on this line ("vision.Widgets.CreateWidget(wg1)") reads "In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user."
While running the code I've included below I receive the error "EntityCommandExecutionException was unhandled by user code.I'm then told to look at the inner exception for details...and there I see under Data:"In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user."And under Inner Exception --> Message:"A transport-level error has occurred when receiving results from the server.[code]
I receive a System.Data.SqlClient.SqlException in the following code: Specifically Incorrect syntax near ' In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user. The exception detail in its entirety is shown below the code.
I have a listbox and I want to loop through each of the items to see if the string im looking for is inside. I know I could do .contains but that wouldnt look at substrings. The code im using looks like this:
While tempInt > Listbox.items.count then if searchString.contains(listbox(tempInt)) then end if tempInt+=1 end while
Everything in the loop is fine but VB gives an error on the listbox(tempInt) part. The error is "class windows.forms.listbox cannot be indexed because it has no default value". get around the default value crap? I tried putting in a blank string but no change.
Say I wanna bind to dictionary that TKey is string with XAML:<Label DataContext="{MyDictionary}" Content="{Binding Item("OK")}" />Doesn't work.How should I do it?
I believe that the correct way to give a property a default value is to use the Default Attribute on the Property.[code]In the property window, the value that's displayed in a grid's property bag when it's newly dropped onto a form is False, not True. It does recognise that the default value should be True because it shows the value as bolded and then de-bolds it when we manualy set it to true - but it doesn't respect the default as the initial value. Is there any way of getting the property bag to respect the default value?
For a given class, with a default property of list, you can access an instance object in the list by doing myClass.defProperty("key"). You can also achieve the same results by typing myClass.defProperty!Key.
I have been told that using the parenthesis and quotes is faster for the way the runtime accesses the Property, but I'd like to understand what is the difference and how do each work...
I understand C# has a similar behavior by replacing the parenthesis with square brackets.
I'm attempting the following:Default Public Property Data(Of dataType)(ByVal key As String) As dataType
Get Return DirectCast(values.Item(key), dataType) End Get Set(ByVal value As dataType) values.Item(key) = value End Set End Property
[Code]...
It made more sense to make it a property, and it would be the default property of the class. The data type can not be specified on instantiation of the class, because it can contain multiple objects of different data types.
I have a FontFamily property, but I don't know how set the default value:
Public UnitsFontFamilyProperty As DependencyProperty = DependencyProperty.Register("UnitsFontFamily", GetType(FontFamily), GetType(ValueAndUnit), New FrameworkPropertyMetadata(New
I'm converting Visual Basic.Net code to C# in my project. But I have some doubts on how to convert Visual Basic default property to C#. The first option that comes to me are the indexers. Lets imagine the next code in Visual Basic
Public Class MyClass Dim MyHash as Hashtable Public sub New()
The following XAML produces an AmbiguousMatchException. The DataContext for myText is a DataTable consisting of > 1 row which contains a DataColumn named "test":
I am inheriting my own DataGridView (say MyDataGridView) from the standard DataGridView control. What I want is that certain properties of MyDataGridView should have a different default value than what its base have. For example, AllowUserToAddRows, AllowUserToDeleteRows, AllowUserToResizeRows properties should have the default values of False; so that when I drag MyDataGridView into a form in the IDE, the default values shown in the properties grid should be False. Later on, if I want to change them to True from the grid, they will be set accordingly.
I am making a new class that requires a lot of input information. Some of the properties need to be set to a default value, however I do not want to hard code them into the class.
What do you think would be the most efficient way to populate these properties?
I've been thinking of making a new class to hold all the default props and pass them as one object into the new class as a single argument but it seems kind of clunky.
Given a simple class like this: Public Class clsOB Implements System.ComponentModel.INotifyPropertyChanged Private _Frequency As Double Private _Value As Double Public Event PropertyChanged(ByVal sender As Object, ByVal e As [Code] .....
And then I'd like to do something like this: Dim o As New clsOB(50, 30) o = 31
What is the difference between these two methods for defining property value defaults? [code] Is there a reason to use one method over the other for defining the default property values in a class?
I use the following line of code within a single method to explicitly check and trust an SSL cert from the following host: MyTrustedCompany.com:
ServicePointManager.ServerCertificateValidationCallback = Function(obj As [Object], certificate As X509Certificate, chain As X509Chain, errors As SslPolicyErrors) (certificate.Subject.Contains("CN=MyTrustedCompany.com"))
No problem with the code -> works perfectly 100%.
The problem is, it is too far reaching. I thought its scope would only be within the method I decalred it, but apparently it is a Shared property on the 'ServicePointManager' object, and must then persist for the entire application, which I do not want.
The problem is later I am calling web services of mine, etc and getting the "Could not establish a trust relationship..." exception. This is because in the line of code above I check for the host name of an SSL cert specefic to that method. I quickly tested Returning 'True' from the callback so all certs would be trusted instead of checking for a specefic name (i.e. MyTrustedCompany) and subsiquent requests worked. This is how I know this callback assignment reaches father than that single method. Sure I could extend the callback to include all other certitificate names, but what I would rather do is set the 'ServerCertificateValidationCallback' back to its default behavior. Like the pseudo code below:
I am inheriting my own datagridview (say MyDataGridView) from the standard datagridview control. What I want is that certain properties of MyDataGridView should have a different default value than what its base have. For example, AllowUserToAddRows,
