Load An Object By Name?
Dec 1, 2010Is there a way to load an object based on the variable's name as a string?
e.g. Dim MyObject as Object = ' Load by object name as in: "MyObject" & someVariable
Is there a way to load an object based on the variable's name as a string?
e.g. Dim MyObject as Object = ' Load by object name as in: "MyObject" & someVariable
I have a string which contains XML. I want to create an XMLdocument from this. I am using Load and LoadXMl methods like this:
Dim doc As XmlDocument
doc.LoadXml(applicationXml)
but they are retuning:
Object reference not set to an instance of an object.
My XML looks like this:
<gate.util.persistence.GateApplication>
<urlList class="gate.util.persistence.CollectionPersistence">
<localList>
[Code]....
let's say I have 5 DLL files that are each a partial class, that they should form together... Is there a way I could load these 5 files into 1 assembly object ?
View 2 RepliesWhat we want to do is save an entire control into Cache and recommit the properties on page load, including data items. But we'd like the controls to exist already in the page.
[Code]...
The code I am having problems with is supposed to take a ID number and load the information from several different tables into a game object, then return the object. When it tries to load the data into the object I get an error saying there is no data in the row or column. [code]
View 2 RepliesI am trying to load the text file to the ListBox Object. But it doesn't work.
' Initialize an instance of the StreamReader object and declare variables
Dim objReader As IO.StreamReader
Dim intCount As Integer = 0
Dim intFill As Integer
[Code]...
Save & Load all object property within a form??
I have been working on thread [URL], but it only limitation is it cannot save and load control that is child control (within groupbox, tabcontrol)..
I'm working on a calculator for an online text based game, Cybernations. This game revolves around building your nation.I currently am using a class called Nation, this contains all the values for the nation such as infrastructure and land lvls. I want a way to save a nation as a file so that I can load it later and keep playing with it. I also want to be able to save multiple nations.
I'll need specifics on how to declare this in the program and where. I currently have a nation declared in my main form called ThisNation that is global. I think I can define ThisNation in the loading form as the selected file, but I'm not sure on how to do that. The actual file loading needs to be called from a button click in the loading form, then the program switches to the main form where you can actually do stuff.Where should I put the loading process, and how should I define ThisNation as the file?
I'm just needing a simple bit of code for vb.net that will allow me to marshal an object into a string, allowing for the saving and loading of this string so I can save my classes, needs to be simple and easy!
View 1 RepliesI'm adding web user controls to a page dynamically. Using the LoadControl method that only takes a virtual path pointing to the .ascx works pretty nicely. However, the overload of LoadControl that takes a type and an array of parameters is causing me some headaches. The web user control is instantiated as expected, but the controls contained within the web user control are null and I get an exception as soon as I try to work with them. Strange, because it's working when use the first version of LoadControl.
The web user control, simple, with a Literal control:
<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="MyControl.ascx.vb" Inherits="MyControl" %>
<asp:Literal ID="myLiteral" runat="server"></asp:Literal>
The controls' code behind:
Public Class MyControl
Inherits System.Web.UI.UserControl
Public Property Data As MyData
[code]....
And the relevant code from the .aspx from which I'm trying to dynamically load the control:
Private Sub Page_Init(sender As Object, e As System.EventArgs) Handles Me.Init
Dim x = LoadControl(GetType(MyControl), New Object() {New MyData With {.ID = 117}})
Page.Controls.Add(x)
[code]....
I have a simple application, that was working just fine then all of the sudden I open the file and the design pages will not show up and I get the following warnings:
Warning 1 Could not load type 'System.Object' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' because the parent does not exist. G:ProgramsCONNS v 1.0ConnectionsFrontPage.Designer.vb 149 0
I am somewhat new to object oriented programming and am attempting to flatten a Linq object hierarchy by using a shim class.how to initalize a derived class with property values from a base class?I have two objects, a base object with about 100 properties, and a derived object which inherits from the base object and adds a few additional properties beyond those of the base object. My simple constructor creates the derived object, but I am looking for a way to initialize the derived object properties with values from the base object.Right now I am using reflection to iterate over the properties individually and I suspect there may be a better way. The following example shows my shim class constructor for the derived class, and two properties:
newProperty1 - a new string property of the derived class
flattenedProperty2 - a new string property of the derived class, copied from a 2nd-level object of the base class
Code example:
Public Class derivedObj
Inherits baseObj
Private _newProperty1 As String[code].......
Is this the correct constructor approach to flatten the object hierarchy using a shim class? My second question relates to initialization of properties in the derived class. The constructor above creates the derived object, but what is the best way to initialize the derived object properties with values from the base object? The following code uses reflection to iterate over the properties individually, but I suspect there may be a better way.
Code example:
' property names are in the string array fieldNames
'baseObjQuery is an ienumerable of baseObj
'derivedObjList is a list of derivedObj[code].....
Is there a simple way to initialize values for the properties in the derived object based upon the values of the common properties in the base object?
I want a rich text box to display public variables like (pizza toppings links etc that have been selected in other forms) these variables have declare in a module. But I want the rich text box to display these variables as soon as the screen loads ( a on form load event) if you know what I mean.
View 1 RepliesI would like to load a default created image at start. But seems to not be working on form load any ideas.[code]
View 5 RepliesWhenever i start my form (window application) and link from one form to another, my data doesn't load but when i close the respective form and open it again , it appear. Can i know where is my problem ? Thx in advance. Here's the code snippet :
Private Sub AccessControl_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim sqlstring As String = "select * from depttable"
Dim connection As New SqlConnection(db.cs)
Dim dataadapter As New SqlDataAdapter(sqlstring, connection)
[code]....
I Want A Web-Browser (WebBrowser1.Navigate [url]) to navigate to a direct site witha .txt file so the text appears in the browser. ok that works.
When Form1 Loads I want To Use This But It Wont Work WebBrowser1.Navigate[url] but it will only work if form1 contains WebBrowser1.Navigate[url] and button1 = TextBox1.Text = WebBrowser1.Document.Body.InnerText.
Final Question How Can I Get Form1.Load To Do Both Operations
I am getting following error whenever I want to use IIf function inside entity framework query.
LINQ to Entities does not recognize the method 'System.Object IIf(Boolean, System.Object, System.Object)' method, and this method cannot be translated into a store expression.
I have a couple of tables in a sql server database and i want to load the data from them in form load.
Here is the code i use to load the first table
connection string here
Con.Open()
Dim objCmd As New SqlCommand("SELECT * FROM Customers", Con)
Dim cust As SqlDataReader = objCmd.ExecuteReader()
[Code]...
What do I need to convert?
Dim CEESearchByAppNo = From CEEsearch In dbCEE.tblScanneds _
Where CEEsearch.AppNo = iAppNo
[code].....
When I load the report from my c: drive it works fine:
[code]...
Now when I load the report from solution explorer it tells me "Load report failed. The system cannot find the file specified"
[code]...
I have added the report to solution explorere and part of my project
How do I calculate the direction an object is facing in degrees, if object A is at x1, y1 and facing object B which is at x2, y2?
View 2 Repliesi am using the below code in VB.Net to load the available serial ports :
COMsComboBox.Items.Clear()
Dim i As Integer
For i = 1 To My.Computer.Ports.SerialPortNames.Count
COMsComboBox.Items.Add(My.Computer.Ports.SerialPor tNames(i - 1))
Next
i also want to load their names as seen in the "device manager",
Imports System.Data
Imports System.Data.OleDb
Public Class Form1
Dim con As OleDbConnection
Dim cmd As OleDbCommand
[CODE]...............
The insertion part of the form works great. But my problem is in the form load part......If i leave a field blank(Null),then perform Save operation,close the form after successful insertion and then reopen the form,then it retains the previous values during the form load......This is only in case where i leave a field blank in the previous data entry in the database.......But if i enter values in all fields then form load is working great.
Occasionally I encountered this exception message while trying to download file from a server using System.Net.FtpWebRequest and System.Net.FtpWebResponse Object.
Download a file.ftpRequest_DL.Method = WebRequestMethods.Ftp.DownloadFile get the response object
Dim ftpResponse_DL As FtpWebResponse = CType(ftpRequest_DL.GetResponse, FtpWebResponse)
[Code]...
If I declare my object at the beggining of my page class, and instantiate it in a dropdownlist selected_index change event. Shouldn't this object be available thru out the entire page and also persist thru a postback? I lose the object in my selected date change event in my calendar.
[Code]...
I have an ssis package that takes a flat file and dumps it to SQL. During that process, 150 columns need to have '-' and '.' removed from them. I have done this using a Script Transformation.
Public Overrides Sub Input0_ProcessInputRow(ByVal Row As Input0Buffer)
Dim column As IDTSInputColumn90
Dim rowType As Type = Row.GetType()
[code]....
Edit I've discovered that this line is the problem
Dim strCol As String = columnValue.GetValue(Row, Nothing).ToString()
I am trying to start the process with the following parameters When I try to start it though I get an System.nullreferenceexception: Object reference not set to an instance of an object
Dim exepath As String = Application.StartupPath + "inffmpeg.exe"
Dim sr As StreamReader
Dim cmd As String = " -i """ + input + """ -ar 22050 -y """ + output + """"
Dim ffmpegOutput As String
[code]....
In the Session_Start of the Global.asax i have
Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
Session("login") = False
[code]....
Why i am getting error the error Object reference not set to an instance of an object. at line
If Current.Session("login") Is Nothing Then
while checking for the login state as follows?
If GetLogin = False Then
'Do something
End if
I mean i have already created the instance on the Session_Start... Haven't i?
I have an object that is defined as a global variable based on custom class. Within that class I have an event that gets fired a certain intervals. These events are fired on the same thread as where the object is declared. How do I create a global object, but have the events within that object fire on a separate thread?
View 2 Repliesi am using VB.net 2003 and i am trying to get the number of rows of a dataset from form1 into form2 in order to use it for something else and i am getting the error"System.NullReferenceException occured...Additional information: object reference not set to an instance of an object"...my code is like this:in form1:Public x as integer= me.dataset.table.rows.count here it gives me the error
in form2:
dim frm as new form1
msgbox(frm.x)