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I know how to do the code shown in ClassA and ChildClassB, but how do I go about coding the example in GrandChildClassC, which needs to not do the stuff that ChildClassB does in this function, but still do what Class does.
How do I can call the code like: WebBrowser1.Document.applets(0).func()I was answered that it is possible in VB 6 and earlier.
View 3 RepliesI want to create an ExpressionTree where a Func(of Vector, Vector, Vector, Vector, Double, Double, Vektor) should be called. So I use
Expression.Call(Forces(0).Function.Method, {Vec1, Vec2, Vec3, Vec4, Double1, Double2})(Vec1-4, Double1-2 are declared as ParameterExpression and Forces(0).Function as Func(of Vector, Vector, Vector, Vector, Double, Double, Vector). But I get an AgrumentException, because Forces(0).Function.Method has seven Arguments. (System.Runtime.CompilerServices.Closure as seventh argument at Index 0).
Is there any difference between the following:
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exactly how much memory does a System.Func holds?Is there any difference if the System.Func is 1 line or 1000 lines?
View 4 RepliesHow to give another function's returned value in LINQ Ienumerable.
Private function GetFruitColor(fruit) as string
'It returns fruit color.
'If valid fruit and color not available, it returns ""(empty string)
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'Below code is wrong. but please suggest me how to correct it. My intention is, I want output collection(say dictionary) of each fruitname and its color(returned by other function call) for all the fruits which the GetFruitColor is not nothing(it can be empty or valid string).
Dim query = _
fruits.Where(Function(fruit) k= GetFruitColor(fruit) if not k is nothing select fruit, k)
End Sub
I have a method that looks like this :
Function ExecuteAndLogError(Of TResult)(ByVal code As Func(Of TResult), _ByVal sql As String, _Optional ByVal parameters As SqlParameterCollection = Nothing) As TResult End Function
I am getting this compiler error : 'Func' is ambiguous in the namespace 'System'.
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I have a section of code that deletes a lot of columns, one at at time, based on conditions that arise. Currently it does this:
objrpt.objXLSheet.Columns(col) _
.EntireColumn.Delete(Excel.XlDeleteShiftDirection.xlShiftToLeft)
There are so many of these, that I'm getting tired of looking at these lines so I want to curry the references to the Excel stuff.I tried:
Dim DelCol As Func(Of Integer) = Function(col As Integer) _
objrpt.objXLSheet.Columns(col) _
.EntireColumn.Delete(Excel.XlDeleteShiftDirection.xlShiftToLeft)
but that won't compile, giving me the error: "Nested function does not have the same signature as delegate 'System.Func(Of Integer)'. Ah forget it. I see that I'm trying to call a method from a function. I guess that won't work.Wait, I'm now trying it another way. I first defined a function:
Private Function DeleteColumn(ByRef objrpt As ExcelReport, ByVal col As Integer) As Object
DeleteColumn = Nothing
Dim objrng As Excel.Range
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Now the error message is a little different:
"Nested function does not have the same signature as delegate 'System.Func(Of Object)'.
I have a list of properties and values that i'd like to use to dynamically build an Expression(Of Func(Of MyClass,MyClass))
I can run through the list and create each Expression by itself, but the only way I know how to combine them would be to use Expression.And or Expression.AndAlso, but that returns a BinaryExpression rather than my original Expression(Of Func(Of MyClass,MyClass)).
i'm trying to do some appointment book so i decided to use MonthCalendar control and date changed event for choose the date i tried dataset.table.rows.find() function on other tables which have int primary key and it works its finds my row/s i need but when i tried this func. on date type primary key it cannot find i tried to search with date type ==> fail search with string type like 03.07.2012 ==> failed etc.
View 3 RepliesValue of type 'System.Func(Of String, String)' cannot be converted to 'System.Converter(Of String, String)
Why? They are both effectively a function pointer (or delegate?) to a function that accept a string and return a string.
Simple Question about .Net processing:
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(using VB.Net 2008) I'm inheriting from a class, and overriding one of the properties. However, the original property has public get & set, whereas I want to make it read-only in my derived class, because the property in my derived class is already determined by other factors. But it appears I can't change the access level of any overridden method. Is this possible?
The closest analogy I came up with is suppose you have a Person class, with a get/set Address property. Now suppose you inherit Child from Person, and Child will have a new Parent property. Say you want the Child's Address property to be readonly, because it will simply return the address of Parent. Even if you can override the Address property, you can't make the Set non-public. The best I can do is make it throw an exception but that's obviously misleading during design time.
I've been studying the example of what I think is an overridden ListView class posted at MSDN: [URL] Am I correct in assuming that this is, in fact, an overridden ListView class that I can use in place of ListView as an OwnerDrawn version of ListView, and which I can modify to my liking as I make sense of how to do so?
View 16 RepliesI can't cast my objects. I get: "Unable to cast object of type 'ClassA' to type 'ClassB'".
The service Class:
Public Class svc_Insp
Implements Isvc_Insp
Public Function Test(ByVal pm_income As ClassC) As String Implements Isvc_Insp.Test
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Given a list of objects, I'd like to print a string version of them just in case the object.ToString() result is a relevant string.By that I mean I don't want to get things like:
obj.ToString() -> System.Collections.Generic.List`1[MyLib.Dude]
obj.ToString() -> System.Collections.Generic.Dictionary`2[System.Int32,System.DateTime]
obj.ToString() -> System.Byte[]
But I want to get things like:
obj.ToString() -> Hi
obj.ToString() -> 129847.123
obj.ToString() -> Id = 123
What should be the best way to implement this in a method:
Public Sub PrintInterestingStuffOnly(ByVal coolList as Ilist(Of Object))
For Each obj in coolList
'insert solution here
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I have a simple Windows Form that hosts property controls at runtime. When the user clicks Close [X] I want to keep the window and its contents alive rather than killing it by handling the FormClosing event, canceling the event and simply hiding the form.
That's fine but at close of the application I need to actually close the window. I implemented the below but it feels kludgey. Is there a simpler, more clever way to handle this situation? (The form's controller calls KillForm explicitly after it receives a closing event from the main window.)[code]...
I have a usercontrol which overrides the property Text. But this property is not shown at design time.If I rename it to caption or value it is shown in properties at design time but Text is not shown.
public Class SomeControl
Inherits System.Windows.Forms.UserControl
Public Overrides Property Text() As String
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I am invoking a webservice and got this error..Do anyone know what is the exact problem..System.ServiceModel.Security.MessageSecurityException: An unsecured or incorrectly secured fault was received from the other party. See the inner FaultException for the fault code and detail. ---> System.ServiceModel.FaultException: An error occurred when verifying security for the message.
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I am trying to dynamically create COM object, call COM method and set COM properties. The COM class is a VB6 ActiveX DLL. The implementation is exactly equal to the VB6 code from this page
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I am creating a bot ( for personal use ) to automate posting to my website . I have used the webbrowser control and i have managed to send data to the webform using the follwing code :
Dim elm As System.Windows.Forms.HtmlElement
For i As Integer = 0 To WebBrowser1.Document.All.Count - 1
elm = WebBrowser1.Document.All.Item(i)
If elm.TagName.ToUpper() = "INPUT" Then
If CType(elm,System.Windows.Forms.HtmlElement).Name="login_name" Then 'Get User ID Element
CType(elm, System.Windows.Forms.HtmlElement).InnerText = "username"
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The code is supposed to fill to textfield on the form ,username and password . The webform also has a Button ,when clicked will LOGIN to the website .The problem is that i don't know how to invoke the login button on the webpage
I'm converting a VB6 app to vb.net.The code creates objects using the CallbyName function with the classes name & and method being read from a database.I want to rewrite the classes in vb.net and have the same behaviour as I read in the name of an object from the database, instantiate it, and call one of it's methods.I don't know ahead of time what the names of the classes will be, so I can't make a reference to them in my project.
View 1 RepliesI have a RichTextBox (txtCustomDict) ... and i am invoking it like so from another thread:
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EDIT: Just checked and it does the same thing if i split it into 2 differently named subs then invoke the other sub
The function below will be called from another thread. So the control themselves will have to be invoked so that the correct thread that created them can change the properties.However, as I have many controls that need to be updated. I don't really want to write all those delegates for each one. I have done one below. [code]
View 1 Replieshere is my form code for the button i need to invoke PHP
<tr><td colspan="2" align="right"><input type="hidden" name="subjoin" value="1"><input type="submit" value="Join!"></td></tr>
this is part of my process.php which process the data given it, this determines the user is doing
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How would I invoke a click event in a vb web browser without an id for the element?
View 1 RepliesI would like to know how to invoke the Windows Security Dialog (press ctrl+alt+del on a windows workstation NOTE: i dont want the task manager!) programatically.ON AN XP WORKSTATION, don't worry about Win7 or Vista with a quick example in C# (or VB.NET if you must)Ive searched many of the DLL's such as msgina.dll and i can't find it anywhere!
View 4 RepliesI'm calling a asp.net web page in a winform webbrowser control.The webbrowser is being used to take the user information and submit it the database, creating an item On the winform I have a submit button that invokes ("click")
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If I look at the webpage source, the hidden value is populated with an value. I think posting the value on to another page will fix my issue, but I want to avoid doing that.
I'm making a little program in where i'm trying to invoke a method from a class dynamically with so called Reflection.The class I'm trying to call is called ContactList and i try to invoke the method in this class called count. The assembly itself is called Contact.ExeNow I have the following code:
Public Function InvokeContacts() As Integer
Dim ContactsAssembly As Assembly = Assembly.LoadFrom("Contacts.exe")
Dim Mycontactlist As Type = ContactsAssembly.GetType("ContactList")
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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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