C# - Pass In A Property Name As A String And Assign A Value To It?
Aug 9, 2010
I'm setting up a simple helper class to hold some data from a file I'm parsing. The names of the properties match the names of values that I expect to find in the file. I'd like to add a method called AddPropertyValue to my class so that I can assign a value to a property without explicitly calling it by name.The method would look like this:
//C#
public void AddPropertyValue(string propertyName, string propertyValue) {
//code to assign the property value based on propertyName
}
'VB.NET'
[Code]...
Is this possible without having to test for each individual property name against the supplied propertyName?
In my EF4 EntityModel I have an entity named Users. Users have the common UserName and Password string fields. If I do something like this
Dim u as new USERS U.UserName = String.Empty Then U.UserName are still Nothing.
But if I Do Something like this Dim u as new USERS u.UserName = "A" u.UserName = String.Empty Then U.UserName take String.Empty as value without problem.
The reason is the way that EF4 generate the UserName Property Public Property UserName() As Global.System.String Get Return _UserName End Get [Code] .....
I do not want to make two assignations every time I want to set string.empty to a property with a nothing value, and I do not want to remember that I must do it in this way everytime, because I'm pretty sure that I will forget it and then I will introduce bugs in the code. I just want to assign the empty.string value to a property and the property take "" as value.
This code snippet was converted from the c# snippet on this link A ChildWindow management service for MVVM applications There are two classes in this snippet first is my confirmessage class
[Code]...
Now this works fine in C# , however in vb,net the line where I add the event handler generates the following error on the message.callback property : Property access must assign to the property or use its value I am tearing out my hair on this I have never used the Action of T delegate before so could i be missing something simeple ? I can provide the c# code as well.
got an ErrorProperty access must assign to the property or use its value.Here i attach the code which have an error.In this program i tried to add data into form . I also create button , textbox. i am using visual studio 2005 and sql 2005. i also have attach the imagece
Private Sub btnregister_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnregister.Click admin1.LoginDataSet.staff(Me.NAMETextBox.Text, Me.TELEPHONEMaskedTextBox.Text,
Well in my vb project it has started giving me a really weird error underlining all my msgbox codes for some reason
this is the error Error 83 Property access must assign to the property or use its value. C:UsersAidanDocumentsVisual Studio 2008ProjectsXeX 360 ModzZ B0XXeX 360 ModzZ B0XForm1.vb 56 17 XeX 360 ModzZ B0X
Public MustInherit Class AddOn Public Delegate Sub UpdateProgress(ByVal fractionComplete As Double) Private privateProgressUpdate As UpdateProgress Public Property ProgressUpdate() As UpdateProgress
[code]....
I am getting the error that "Property access must assign to the property or use its value" in the above code.
I have a type that is derived from an Entity generated by the Entity Framework 3. How do I assign one Customer's Order property to the Derived Customer's Order property?
derivedCustomer.Orders = customer.Orders
I'm not actually trying to swap orders; this is just an example of what I am trying to achieve. Has anyone done tried this and succeed?
I get this error, "property access must assign to the property or use its value" I am trying to assign values in a texbox and a combobox to a single vaiable but it gives an error. My line of assignment is feditForm.textbox.Text & "-" & feditForm.comboBox.Text = fnum. fnum is the variable which holds the value got from the datagridview cell. it is defined as Dim fnum As String = Me.regFarmGrd.SelectedRows(0).Cells("NUMBER").Value.
I have got this error and i want to know what property access is, i have deliberately not shown the line of code that it is to do with as i do not want to be given the final answer. I think i understand 'must assign to the property or use its value' does this mean that when setting something the object being set (as i am trying with font stlyle i will use it) font style must be set to bold or italic and then the bold font needs to be put somewhere?
At the moment i'm working hard to better understand aspnet (VB), still learning and still enjoying, but at the moment i'm struggling with (i think something realy easy) but can't find out how to fix it,what i need to do is: assign the propperty Weekday() of CSlot Dim CSlot As New timeslotParamTO I have to assign te propperty weekday to Cslot but the propperty must be 1 or more items from the Public Enum WeekdayEnum. i just can't figure out how to assign 1 or more weekday's to CSlot.weekday().
It seems that VB.NET and C# readonly keyword have some differences... Say, a ReadOnly property in C# can be assigned in some conditions, but in VB.NET - never?
Is there a tab property I can assign to make a given tab not only the "top" (or active) tab but also the left most or is there another way to do this?(It seems pretty straight forward to make a tab the top or active tab.)The requirement is that I've got one tabcontrol that contains a potentially large number of tabs. Each member tab has a right fair number of controls and dialogs.These tabs are all grouped by fours sequentially. For example, tabs 0-3 are one group, 4-7 the next group, etc.I'd like to control the display of this tabcontrol from a different tab control. This second tab control contains high level information about the 1st tab control as well as a lot of other things pertaining to all four tabs that the user needs to see as well.For example, if I've got 8 total Tab1's, then I've got 2 Tab2's.When Tab2(0) is selected, I'd like Tab1's leftmost item to be Tab1(0). When Tab2(1) is selected, I'd like Tab1(4) to be my leftmost tab in Tab1, rotating the lower 4 out of view for the time being.
I am trying to assign a dataset to the TAG property of a textbox control in my application. The code seems to do the assignment without any error but I cant see the property TAG name or the assigned value using quickwatch etc. etc. The TAG property name does show in the design window.
Is this property useable in my version (academic 2002 version 7.0) or does the TAG and any assigned value it holds not show in quickwatch. I can only find 1 reference which seems to suggest the TAG property is not supported in early versions, but would prefer a definitive answer.
I have a class named clsBatch that has a public property named prpInsertDateTime. If I hover over DateTime.Now while in debug mode the value is "#10/6/2011 9:41:04 AM#" For some reason when I run the code below clsB.prpInsertDateTime = "#12:00:00 AM#". Why is this happening? Private Sub btnTransfer_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnTransfer.Click
Ok i have made, a app in VB , but the problem is i keep getting a build error( ive made this in VS studio 2010 beta .net framework 4.0 if its necessary) its a simple web browser.
------ Build started: Project: WindowsApplication1, Configuration: Debug x86 ------ c:\users\tristan\documents\visual studio 2010\Projects\WindowsApplication1\WindowsApplication1\Form1.vb(33) : error BC30545: Property access must assign to
[code]....
the int is defined but it says it must be assigned to the property, even if i change int = 0 , i get the same error
I have a simple tabbed Web browser, and at the close tab I receive the message 'Property access must assign to the property or use its value' ... what can I do to make it work? Public Class Form1 Dim i As Integer = 0 Private Sub Done(ByVal sender As Object, ByVal e As Windows.Forms.WebBrowserDocumentCompletedEventArgs) TabControl1.SelectedTab.Text = CType(TabControl1.SelectedTab.Controls.Item(0), System.Windows.Forms.WebBrowser).DocumentTitle [Code] .....
What is the code to assign a event handler value to the Text property of the appropriate label. Here is my code so far and I want the values created by clicking the button to display in the text for the associated text boxes?
I am trying to display my data in datagridview. I created a class with different property and used its list as the datasource. it worked fine. but I got confused how to do that in case we have nested class.My Classes are as follows:
class Category property UIN as integer property Name as string
I have valued pairs, attributes names and values in one hand, and I have an object with attributes. I need to set the values of those attributes. I need something like [code]
So if I create an object test, and it has a property color. When I add this object to an array list I typically can access this using myarray(0).color but intellisense doesn't 'know' that I have a 'test' object inside the array. It would let me type myarray(0).whatever but would then crash if I made typo. It seems like I should be able to let it know what type of object I am trying to work with inside the arraylist. In code maybe something like this
This is a theoretical question, I've already got a solution to my problem that took me down a different path, but I think the question is still potentially interesting.Can I pass object properties as delegates in the same way I can with methods? For instance:
Let's say I've got a data reader loaded up with data, and each field's value needs to be passed into properties of differing types having been checked for DBNull. If attempting to get a single field, I might write something like:
I'm fairly sure this is possible, but what I want to do is have a generic method where I can pass in an object along with a Expression that will tell the method which Property to use in it's logic.Essentially what I would like to code is something like:
Dim firstNameMapper as IColumnMapper = new ColumnMapper(of Author)(Function(x) x.FirstName) Dim someAuthorObject as new Author() fistNameMapper.Map("Richard", someAuthorObject)
Now the mapper object would know to set the FirstName property to "Richard".Now using a Function here won't work.
