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I'm trying to figure out how to make the Ascending / Descending extension in an Order By statement in a Linq query conditional based upon a menu selection. Here's the query:
Dim fileItem = From files In itemList
Where files.Tag(0) = "file"
Order By files.SubItems.Item(indx).Text
Select files
(itemList is a List of listviewitems)
Any advice is appreciated.
Sometimes the true reward for completing a task is not the money, but instead the satisfaction of a job well done. But it's usually the money.
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Not exactly what I was hunting since the menu item isn't a part of the collection. But no big thing. I finally just added code to reverse the collection if I needed it sorted in descending order.
Sometimes the true reward for completing a task is not the money, but instead the satisfaction of a job well done. But it's usually the money.
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Simple:
Dim fileItem = From files In itemList
Where files.Tag(0) = "file"
Select files
If shouldSortDescending Then
fileItem = From files In fileItem
Order By files.SubItems.Item(indx).Text Descending
Select files
Else
fileItem = From files In fileItem
Order By files.SubItems.Item(indx).Text
Select files
End If Or, using "method syntax":
Dim fileItem = itemList.Where(Function (files) files.Tag(0) = "file")
If shouldSortDescending Then
fileItem = fileItem.OrderByDescending(Function (files) files.SubItems.Item(indx).Text)
Else
fileItem = fileItem.OrderBy(Function (files) files.SubItems.Item(indx).Text)
End If
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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You could always create your own extension method. 
Module SortingExtensions
<Extension()>
Public Function OrderBy(Of TElement, TKey)(
ByVal source As IEnumerable(Of TElement),
ByVal selector As Func(Of TElement, TKey),
ByVal sortDescending As Boolean) _
As IOrderedEnumerable(Of TElement)
Return If(sortDescending, source.OrderByDescending(selector), source.OrderBy(selector))
End Function
<Extension()>
Public Function ThenBy(Of TElement, TKey)(
ByVal source As IOrderedEnumerable(Of TElement),
ByVal selector As Func(Of TElement, TKey),
ByVal sortDescending As Boolean) _
As IOrderedEnumerable(Of TElement)
Return If(sortDescending, source.ThenByDescending(selector), source.ThenBy(selector))
End Function
End Module
...
Dim fileItem = itemList.Where(Function (files) files.Tag(0) = "file").OrderBy(Function (files) files.SubItems.Item(indx).Text, shouldSortDescending)
There's no option to extend the query syntax though.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Thanks Richard. I ended up writing something similar to the "Simple" version. I've been shamelessly flip-flopping around on this thing for a month - good thing it's just for me and not a customer  .
Sometimes the true reward for completing a task is not the money, but instead the satisfaction of a job well done. But it's usually the money.
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I have an HTML file that I'm loading into a WebBrowser control via .Navigate(myfileURI) which works fine.
In my application I'm trapping Javascript errors in order to handle them myself via the code on this web page:
https://msdn.microsoft.com/en-us/library/system.windows.forms.htmlwindow.error%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396
This seems to work fine until I tweak the compatibility mode in the html file. For example, using the meta tag:
<meta http-equiv="X-UA-Compatible" content="IE=8">
or even no such tag at all works fine. However when I use the meta tag:
<meta http-equiv="X-UA-Compatible" content="IE=10">
or
<meta http-equiv="X-UA-Compatible" content="IE=edge">
the code to trap Javascript errors no longer works.
I'd really like to know why?
I'd prefer to use IE10 or edge for access to better Javascript functionality.
Here's the code I used in a simple Visual Basic Form and WebBrowser control as well as a simple "test.html" file below it:
(Note: the "a.args" line in the html file is suppose to deliberately throw an error)
Thanks in advance,
Jeff
Form1.vb
Imports System.Runtime.InteropServices
Public Class Form1
<ComVisible(True)>
Public Class JSRequester
Public this As Form1
Public Sub log(s As String)
Debug.Print(s)
End Sub
Public Sub send(MFSYS As String)
Debug.Print("[" + this.Name + "] INPUT <" + MFSYS + ">")
this.WebBrowser1.Document.InvokeScript("eval", New Object() {"alert('Hello Script!');"})
End Sub
Public Sub New(frmSender As Form1)
this = frmSender
End Sub
End Class
<ComVisible(False)>
Public bMouseDown As Boolean = False
Public bFormActivated As Boolean = False
Public WithEvents ScriptWindow As HtmlWindow
Private Sub nav(uriFile As Uri)
Debug.Print("STARTED")
WebBrowser1.Navigate(uriFile)
End Sub
Private Sub SuppressScriptErrors()
If (WebBrowser1.Document IsNot Nothing) Then
ScriptWindow = WebBrowser1.Document.Window
End If
End Sub
Private Sub ScriptWindow_Error(ByVal sender As Object, ByVal e As HtmlElementErrorEventArgs) Handles ScriptWindow.Error
MessageBox.Show("Suppressed error!")
e.Handled = True
End Sub
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'*** Change this to your path ***
Dim strAppPath As String = "D:\dev\vbnet\SuppressJavascriptErrors"
Dim uriFile As New Uri("file:///" + strAppPath + "\test.html")
Me.WebBrowser1.ObjectForScripting = New JSRequester(Me)
nav(uriFile)
End Sub
Private Sub WebBrowser1_DocumentCompleted(sender As Object, e As WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
Debug.Print("COMPLETED")
End Sub
Private Sub WebBrowser1_Navigated(sender As Object, e As WebBrowserNavigatedEventArgs) Handles WebBrowser1.Navigated
Debug.Print("NAVIGATED")
SuppressScriptErrors()
End Sub
End Class
test.html
<!DOCTYPE html>
<html>
<head profile="http://gmpg.org/xfn/11">
<meta http-equiv="X-UA-Compatible" content="IE=8"> <!-- change this to "10" or "edge" it FAILS -->
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<META HTTP-EQUIV="PRAGMA" CONTENT="NO-CACHE">
<META HTTP-EQUIV="EXPIRES" CONTENT="0">
<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>YouTube Viewer</title>
<link rel="stylesheet" type="text/css" href="ytv.css">
</head>
<body onload="init();">
<script type="text/javascript">
function testme() {
a.args = "hello"
return;
}
function init() {
window.external.log(">>>HELLO DEBUG...");
window.external.send(">>>HELLO SENDER...");
testme();
document.write("<h1>Hello World!</h1>");
}
</script>
</body>
</html>
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Task:
Two windows have been opened.
1. Outlook
2. the Windows Explorer
If you now take a mail from the Outlokk Inbox with the left mouse button, pull it over to the Windows Explorer and release it there over a folder then the mail is stored there as a file under the name e.g. Request.msg
Request is the subject of the mail.
Now the second window should be the application to be developed.
There should be a textbox above in which the mail is dropped.
So far I have the following code:
Private Sub TextBox1_DragOver(ByVal sender As Object, ByVal e As DragEventArgs) Handles TextBox1.DragOver
'erlaubte DropEffects festlegen
If e.Data.GetDataPresent("FileGroupDescriptor") Or e.Data.GetDataPresent("FileDropList") Then
e.Effect = DragDropEffects.All
Else
e.Effect = DragDropEffects.None
End If
End Sub
Private Sub TextBox1_DragDrop(ByVal sender As Object, ByVal e As DragEventArgs) Handles TextBox1.DragDrop
' Drop durchführen
Dim ioStream1 As IO.Stream = DirectCast(e.Data.GetData("FileGroupDescriptor"), IO.Stream)
Dim Array1(CInt(ioStream1.Length)) As Byte 'Array anlegen
ioStream1.Read(Array1, 0, Array1.Length) 'Array füllen
'Build the FileName from the FileGroupDescriptor block.
Dim sFileName As New System.Text.StringBuilder("")
Dim i As Integer = 76 'The FileName starts at position 76 in the FileGroupDescriptor.
While Array1(i) <> 0
sFileName.Append(Convert.ToChar(Array1(i)))
i += 1
End While
ioStream1.Close()
MessageBox.Show(sFileName.ToString) 'der Dateiname wird richtig angezeigt
'Mail Inhalt auslesen
Dim ioStream2 As IO.Stream = DirectCast(e.Data.GetData("FileDropList", True), IO.Stream)
Dim Array2(CInt(ioStream2.Length)) As Byte 'Array anlegen
ioStream2.Read(Array2, 0, Array2.Length) 'Array füllen
End Sub
The file name is displayed correctly but ioStream2 is allways nothing
"FileDropList" is probably the wrong parameter. But which one is the right one?
Microsoft.Office.Interop or
System.Runtime.InteropServices and
Dim objOL As New Microsoft.Office.Interop.Outlook.Application
may not be used because an error message is displayed on the Exchange Server.
How can I read the content of the mail?
Thanks in advance
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There's a sample right here on CodeProject:
Outlook Drag and Drop in C#[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Thanks for the answer!
But System.Runtime.InteropServices; is used.
This causes error messages on the Exchange Server.
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Office Interop is blocked on a server. So, why would you want to create a UI for the server? And might what you want not be easier by writing an outlook-plugin?
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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I'll suggest it to my investigator. Thank you for all your answers!
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Hello everyone,
I created a code to save all information in datagriedview1 when I close my application but it doesn't work. Could you help me to find my error?
Imports System.IO
Imports System.Runtime.Serialization.Formatters.Binary
Public Class Form1
<Serializable()> _
Public Class TNode
Public text As DataGridView
End Class
Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
DataGridView1.Rows.Add(TextBox1.Text, TextBox2.Text)
End Sub
Private Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim DataGridView1 As DataView
Dim Col As Integer
Dim ran As Integer
Dim contacttable As New List(Of String)
Dim f As IO.FileStream = File.Create("enregistreContact.bin")
Dim text As New BinaryFormatter
Try
For Ran = 0 To DataGridView1.Count - 1
For Col = 0 To 2
text = DataGridView1.Item(Col, Ran).Value
Next
Next
text.Serialize(f, contacttable)
Catch File As Exception
MsgBox("You must write a text!")
End Try
f.Close()
End Sub
End Class
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You should be storing all of your data in a suitable data stricture, NOT directly in the DGV. Once you have the data in a data structure, you set the DataSource of the DGV to the data structure. It also makes it MUCH easier to save the data structure to a file than the DGV.
You data structure can be a List<t>, a DataSet, a DataTable, some custom collection, ... whatever. Just don't use the DGV to "store" data. Controls are there to show a visual representation of data and edit that data, not to store it.
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Thank for your answer.
Have Nice day.
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Thank you for your answer.I'm going to try.I'm continous to search a good code.
Have good day. 
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Here is a sample of the Issue:
Class A
Implements ICloneable
Public _ar(2) As Byte
Public Function Clone() As Object Implements System.ICloneable.Clone
Return Me.MemberwiseClone()
End Function
End Class
Private Sub ToolStripButtonTest1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButtonTest1.Click
Dim _A As New A
Dim _B As A
_A._ar(0) = 1
_A._ar(1) = 2
' I thought this would create a new instance copy of _A.
_B = _A.Clone()
' However, these changes are reflected in _B.
_A._ar(0) = 2
_A._ar(1) = 1
end sub
What am I missing? How do I create a copy of _A?
Thanks
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speedbump99 wrote: What am I missing?
It's not a class, but an array of byte-values.
How to copy the contents of your array of values to another array? Array.Copy Method (System)[^].
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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Thanks a lot, I get it now.
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You're welcome; and I recognize the confusion/frustration
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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Creates a shallow copy of the current Object. You're creating a new instance of your class, but sharing the same byte array reference. Changes to the array on one instance will update the array on the other instance.
Shallow Copy vs. Deep Copy in .NET[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Hi:
I work on a program that must capture the printout of a DOS application, filter its contents and send them to another printer.
Monitoring the print queue, I can detect the print job, but I need to take the name of the .spl file that contains the data to print or some way to take its content.
I use the PrintSystemJobInfo object but:
The JobStream property has a NULL value
Neither the JobName property nor the Name property point to the name of the file that contains the data.
(I have read the code of the PrinterQueueWatch project published in the articles, but it is too complex)
This is my first post in the forum.
I appreciate the help
modified 7-May-18 18:55pm.
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