Using VB in .NET2
Public Class GroupSID
Private _groupName As String
Private _sid As String
Public Property GroupName() As String
Get
Return _groupName
End Get
Set(ByVal value As String)
_groupName = value
End Set
End Property
Public Property SID() As String
Get
Return _sid
End Get
Set(ByVal value As String)
_sid = value
End Set
End Property
End Class
After the list is populated I want to find the item with the matching groupName (there will be only 1)
Something like (pseudo VB/C#)
'Dim result As GroupSID = ListOfGroupSID.Find(x => x.GroupName == groupName)
https://msdn.microsoft.com/en-us/library/x0b5b5bc(v=vs.80).aspx?cs-save-lang=1&cs-lang=vb#code-snippet-1
from: http://www.codeproject.com/Articles/388257/Csharp-Tips-Using-delegate-in-List-Find-predicate
' expression expected error on Function(p)
Dim result As GroupSID = ListOfGroupSID.Find(Function(p) p.GroupName = groupName)
Problem is VB8/.NET2 doesn't allow this..
Anonymous function (lambda) aren't available in VB8/.Net2 so you have to define your predicate as a separate method :
Function BelongsToSameGroup(ByVal group As GroupSID) As Boolean
Return group.GroupName = groupName ' need to be accessible
End Function
' usage
Dim result As GroupSID = ListOfGroupSID.Find(AddressOf BelongsToSameGroup)
Related
I'm attempting to get an assignment done for class and have hit this error:
Error 1 Expression of type 'Homework_Code_Examples.Form1.State' is not queryable. Make sure you are not missing an assembly reference and/or namespace import for the LINQ provider. D:\Users\Stryke\Documents\Visual Studio 2013\Projects\Homework Code Examples\Homework Code Examples\Form1.vb 11 32 Homework Code Examples
I've never encountered this before and searching via Google, MSDN and these forums all tell me that I must target the correct .NET framework for my program, however I am completely lost as to which framework I should target as the recommended answers all give the same error upon being recompiled. Currently, I am using .NET Framework 4.5 in Visual Studio 2013.
I don't know if it helps at all or not, but here is my code so that you may see what it is I'm trying to achieve...
Public Class Form1
Dim states As State
Private Sub btnDisplay_Click(sender As Object, e As EventArgs) Handles btnDisplay.Click
states = New State()
Dim query = From st In states
Let name = states.Name
Let density = states.Density()
Order By density Descending
Select name, density
End Sub
Private Sub stateInfo_CellContentClick(sender As Object, e As DataGridViewCellEventArgs) Handles stateInfo.CellContentClick
End Sub
Class State
Private m_name, m_abbr, m_date As String
Private m_area, m_pop As Integer
Public Property Name()
Get
Return m_name
End Get
Set(value)
m_name = value
End Set
End Property
Public Property Abbreviation()
Get
Return m_abbr
End Get
Set(value)
m_abbr = value
End Set
End Property
Public Property joinDate()
Get
Return m_date
End Get
Set(value)
m_date = value
End Set
End Property
Public Property landArea
Get
Return m_area
End Get
Set(value)
m_area = value
End Set
End Property
Public Property Population
Get
Return m_pop
End Get
Set(value)
m_pop = value
End Set
End Property
Public Function Density()
Dim popDensity As Integer
popDensity = Population / landArea
Return popDensity
End Function
End Class
End Class
Linq needs to iterate through multiple objects. In your case, it can be list or collection of State class.
Example with List(Of Type)
Change line
Dim states As State
to
Dim states As List(Of State)
and
states = New State()
into
states = New List(Of State)
Example with array
Change line
Dim states As State
to
Dim states() As State
and
states = New State()
into
ReDim states(10) 'or use a variable inside
Here's a sample of how to populate your data. I also fix some error in your query. Compare your query to mine to see what I changed.
' initialize a list with some values
Dim states = New List(Of State) From {
New State With {.Name = "Ohio", .Population = 10000, .landArea = 10},
New State With {.Name = "Texas", .Population = 20000, .landArea = 300},
New State With {.Name = "Florida", .Population = 5000, .landArea = 1000}
}
' query the list
Dim query = From st In states
Let name = st.Name
Let density = st.Density()
Order By density Descending
Select name, density
I also improve your State class to use proper data type instead of object.
Class State
Private m_name, m_abbr, m_date As String
Private m_area, m_pop As Integer
Public Property Name As String
Get
Return m_name
End Get
Set (value As String)
m_name = value
End Set
End Property
Public Property Abbreviation As String
Get
Return m_abbr
End Get
Set(value As String)
m_abbr = value
End Set
End Property
Public Property joinDate As String
Get
Return m_date
End Get
Set(value As String)
m_date = value
End Set
End Property
Public Property landArea As Integer
Get
Return m_area
End Get
Set(value As Integer)
m_area = value
End Set
End Property
Public Property Population As Integer
Get
Return m_pop
End Get
Set(value As Integer)
m_pop = value
End Set
End Property
Public Function Density() As Double
Dim popDensity As Double
popDensity = Population / landArea
Return popDensity
End Function
End Class
I created a list using a class which has different data types. It is populated as follows:
[1/16/2015 10:30:14 PM] 241.167.2.72:5
[1/17/2015 11:30:06 PM] 100.133.2.55:6
[1/18/2015 12:30:33 PM] 206.140.3.10:7
Now I just want to display this in a textbox on a page. But get this:
ClientWebApp.DedicatedServerApi.Formatted_DDoS_SampleFlows
ClientWebApp.DedicatedServerApi.Formatted_DDoS_SampleFlows
ClientWebApp.DedicatedServerApi.Formatted_DDoS_SampleFlows
I'm using this line of code with the ToString()...but obviously it is not correct.
strSampleFlowLine = formattedDDoSSampleFlow.ToString() & vbCrLf & vbCrLf
Any Ideas?
The code (and classes) that attempts to populate the text box on the page:
Dim ddosDetailsInfoResult As New DedicatedServerApi.DDoSDetailsInfoResult
Dim formattedDDoSSampleFlow As New DedicatedServerApi.Formatted_DDoS_SampleFlows
' Create a list field - an array of the DDoS sample flows.
Dim formattedDDoSSampleFlowsList As New List(Of DedicatedServerApi.Formatted_DDoS_SampleFlows)
If ddosDetailsInfoResult.DDoS_Details.Formattted_DDoS_SampleFlows_List.Count > 0 Then
' Note: had to add .ToList() as it was giving a syntax error: cannot be converted to a 1-dimensional array.
' Does not make sense as the "Formattted_DDoS_SampleFlows_List" variable is defined exactly like the receiving field.
formattedDDoSSampleFlowsList = ddosDetailsInfoResult.DDoS_Details.Formattted_DDoS_SampleFlows_List.ToList()
For Each formattedDDoSSampleFlow In formattedDDoSSampleFlowsList
' Example of entry in the list: [1/16/2015 10:30:14 PM] 241.167.2.72:5
strSampleFlowLine = formattedDDoSSampleFlow.ToString() & vbCrLf & vbCrLf
' Build the sample flow list textbox.
txtGDHDApiSampleFlowList.Text = txtGDHDApiSampleFlowList.Text & strSampleFlowLine
Next
Else
'An empty list.
txtGDHDApiSampleFlowList.Text = ""
End If
'+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Holds formatted DDoS sample flows settings.
' [1/16/2015 10:30:14 PM] 241.167.2.72:5
'+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Public Class Formatted_DDoS_SampleFlows
Private _open_bracket_delimeter As String
Public Property Open_Bracket_Delimeter() As String
Get
Return _open_bracket_delimeter
End Get
Set(value As String)
_open_bracket_delimeter = value
End Set
End Property
Private _time_received As Date
Public Property Time_Received() As Date
Get
Return _time_received
End Get
Set(value As Date)
_time_received = value
End Set
End Property
Private _close_backet_and_space_delimeter As String
Public Property Close_Bracket_And_Space_Delimeter() As String
Get
Return _close_backet_and_space_delimeter
End Get
Set(value As String)
_close_backet_and_space_delimeter = value
End Set
End Property
Private _source_ip As String
Public Property Source_IP() As String
Get
Return _source_ip
End Get
Set(value As String)
_source_ip = value
End Set
End Property
Private _colon1_delimeter As String
Public Property Colon1_Delimeter() As String
Get
Return _colon1_delimeter
End Get
Set(value As String)
_colon1_delimeter = value
End Set
End Property
Private _source_port As String
Public Property Source_Port() As String
Get
Return _source_port
End Get
Set(value As String)
_source_port = value
End Set
End Property
End Class
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Holds DDoSDetailsInfoResult.
'+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Public Class DDoSDetailsInfoResult
Private _message As String
Public Property Message() As String
Get
Return _message
End Get
Set(value As String)
_message = value
End Set
End Property
Private _ddos_details As New DDoS_Details
Public Property DDoS_Details() As DDoS_Details
Get
Return _ddos_details
End Get
Set(ByVal value As DDoS_Details)
_ddos_details = value
End Set
End Property
End Class
'+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Holds DDoS details.
'+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Public Class DDoS_Details
Private _formatted_ddos_sampleflows_list As New List(Of Formatted_DDoS_SampleFlows)
Public Property Formattted_DDoS_SampleFlows_List() As List(Of Formatted_DDoS_SampleFlows)
Get
Return _formatted_ddos_sampleflows_list
End Get
Set(ByVal value As List(Of Formatted_DDoS_SampleFlows))
_formatted_ddos_sampleflows_list = value
End Set
End Property
End Class
Your Formatted_DDoS_SampleFlows class need to define what ToString does.
Something like:
Class Formatted_DDoS_SampleFlows
Public Overrides ToString() As String
Return _open_bracket_delimeter & _time_received.ToString() & _close_backet_and_space_delimeter & _source_ip
End Sub
End Class
use CDate to convert the original value into a Date. The ToString is being operated on the entire class. Then use String.Format to output the date into the correct format you want. Should look something closer to this:
strSampleFlowLine = String.Format("MM/dd/yyyy", CDate(formattedDDoSSampleFlow.something)) & vbCrLf & vbCrLf
I'm trying to do a Bing Image Search Application (Azure Version), and i can't make progress. The code language is vb.net. Basically what i'm doing is trying to edit this code, that actually worked. Any Solutions ?
Function ExecuteQuery() As Boolean
Dim esito As Boolean = False
Try
Dim query As String = System.Web.HttpUtility.UrlEncode("Inception Movie")
Dim skip As String = "10"
Dim urlBase As New Uri("https://api.datamarket.azure.com")
Dim accountKey As String = "tymv8z6jFSdo4eQ3vsS5r8SZAmFtA24e6dmfyvaLh3U"
Dim credentials As New NetworkCredential(accountKey, accountKey)
Dim dsc As New System.Data.Services.Client.DataServiceContext(urlBase)
dsc.Credentials = New NetworkCredential(accountKey, accountKey)
Dim urlSearch As Uri = New Uri(("https://api.datamarket.azure.com/Bing/Search/Image?Query=%27" + query + "%27&$skip=" + skip))
Dim webResults = dsc.Execute(Of WebResult)(urlSearch)
For Each result As WebResult In webResults
ListBox1.Items.Add(result.Title)
ListBox1.Items.Add(result.Description)
singleValue = singleValue + 1
Next
esito = True
Catch ex As Exception
esito = False
End Try
Return esito
End Function
Partial Public Class WebResult
Private _ID As Guid
Private _Title As [String]
Private _Description As [String]
Private _DisplayUrl As [String]
Private _Url As [String]
Private _MediaUrl As [String]
Public Property ID() As Guid
Get
Return Me._ID
End Get
Set(ByVal value As Guid)
Me._ID = value
End Set
End Property
Public Property Title() As [String]
Get
Return Me._Title
End Get
Set(ByVal value As [String])
Me._Title = value
End Set
End Property
Public Property Description() As [String]
Get
Return Me._Description
End Get
Set(ByVal value As [String])
Me._Description = value
End Set
End Property
Public Property DisplayUrl() As [String]
Get
Return Me._DisplayUrl
End Get
Set(ByVal value As [String])
Me._DisplayUrl = value
End Set
End Property
Public Property Url() As [String]
Get
Return Me._Url
End Get
Set(ByVal value As [String])
Me._Url = value
End Set
End Property
Public Property MediaUrl() As [String]
Get
Return Me._MediaUrl
End Get
Set(ByVal value As [String])
Me._MediaUrl = value
End Set
End Property
End Class
I now solved the puzzle, founded a simple way to do this thing just using an class file:
1 - Just download this file: http://www.getcodesamples.com/src/15958EA3/F43E1E1A
2 - Then add the same file to your project
3 - Add the following code:
Dim strBingKey As String = "xxxaccountkeyxxx"
Dim bingClass As New Bing.BingSearchContainer(New Uri("https://api.datamarket.azure.com/Bing/Search/"))
bingClass.Credentials = New NetworkCredential(strBingKey, strBingKey)
Dim query = bingClass.Image("Inception" + "Movie", Nothing, "en-us", "Off", Nothing, Nothing, Nothing)
Dim results = query.Execute()
For Each result In results
ListBox1.Items.Add(result.Title)
ListBox1.Items.Add(result.MediaUrl)
Console.WriteLine(result.Thumbnail) 'ThumbNail type, need to convert to use in result list
Next
Thank you all for the patience!
I get a null reference exception when I try to use this webservice I'm working on. I have two fields in the object ipadarticle called fullname and tags, which are declared to be lists, so that ipadarticle can return multiple tags and authors. The null reference exception points to
ipadarticle2.FullName.Add(a_var.firstname + " " + a_var.lastname)
ipadarticle2.Tag.Add(a_var.tagtext)
I'm pretty new to vb programming, so I'm not really to sure what is causing this. To clarify, what is going on is that this stored procedure is fetching entries from a db, which has a list of articles with -among other things- tags and authors associated with it. Since articles have multiple tags and authors there are multiple entries for each article. When I return the info in the web service I am trying to make it so that only one ipadarticle object is returned for reach article, and then that contains a list of the multiple tags and authors associated with each article. I'm having a headache trying to figure this out.
Dim lq As New lqDFDataContext
Dim var = lq.mobile_IpadGetSavedArticlesAR(simpuser.UserID, tempParamKW(0), tempParamKW(1), tempParamKW(2), tempParamKW(3), tempParamKW(4), pageNum, pageLen)
Dim ipadarticle2 As New ipadArticle()
For Each a_var In var
If a_var.articleID <> temp Then
If flag = 0 Then
result.add(ipadarticle2)
Dim ipadarticle1 As New ipadArticle()
ipadarticle2 = ipadarticle1
End If
ipadarticle2.ArticleID = a_var.articleID
ipadarticle2.PublishedOn = a_var.publicationdate
ipadarticle2.Title = a_var.title
ipadarticle2.MedAbbr = a_var.medabbr.Replace(" ", "-").ToLower()
ipadarticle2.FullName.Add(a_var.firstname + " " + a_var.lastname)
ipadarticle2.Tag.Add(a_var.tagtext)
flag = 1
Else
ipadarticle2.Tag.Add(a_var.tagtext)
ipadarticle2.FullName.Add(a_var.firstname + " " + a_var.lastname)
flag = 0
End If
temp = a_var.articleID
Next
End If
Return result
ipadArticle class:
Imports Microsoft.VisualBasic
Public Class ipadArticle
Inherits SimpleObject
Public Sub New()
End Sub
Private _ArticleID As Integer
Public Property ArticleID() As Integer
Get
Return _ArticleID
End Get
Set(ByVal value As Integer)
_ArticleID = value
End Set
End Property
Private _Title As String
Public Property Title() As String
Get
Return _Title
End Get
Set(ByVal value As String)
_Title = value
End Set
End Property
Private _PublishedOn As String
Public Property PublishedOn() As String
Get
Return _PublishedOn
End Get
Set(ByVal value As String)
_PublishedOn = value
End Set
End Property
Private _MedAbbr As String
Public Property MedAbbr() As String
Get
Return _MedAbbr
End Get
Set(ByVal value As String)
_MedAbbr = value
End Set
End Property
Private _Tag As List(Of String)
Public Property Tag() As List(Of String)
Get
Return _Tag
End Get
Set(ByVal value As List(Of String))
_Tag = value
End Set
End Property
Private _FullName As List(Of String)
Public Property FullName() As List(Of String)
Get
Return _FullName
End Get
Set(ByVal value As List(Of String))
_FullName = value
End Set
End Property
End Class
The most likely cause is that the objects FullName and Tag have not been created (are Nothing) in ipadarticle2. These should most likely be created as new objects in the class constructor.
EDIT:
Based on the posted class, the above assumption was correct: FullName and Tag are defined as List(Of String), but the backing members are never created.
This can be fixed in a couple of ways:
1) Instantiate the backing member variables directly in their definition, i.e.:
Private _FullName As New List(Of String)
2) Instantiate the backing member variables in the constructor:
Public Sub New()
_FullName = New List(Of String)
_Tag = New List(Of String)
End Sub
3) Instantiate the backing member variable in the getter if it is nothing:
Public Property Tag() As List(Of String)
Get
If _Tag Is Nothing Then
_Tag = New List(Of String)
End If
Return _Tag
End Get
Basically, any variable types other than simple data types must be instantiated before they can be used (unless you test them for Nothingness).
I'm trying to deserialize json returned by some directions API similar to Google Maps API. My JSON is as follows (I'm using VB.NET 2008):
jsontext =
{
"version":0.3,
"status":0,
"route_summary":
{
"total_distance":300,
"total_time":14,
"start_point":"43",
"end_point":"42"
},
"route_geometry":[[51.025421,18.647631],[51.026131,18.6471],[51.027802,18.645639]],
"route_instructions": [["Head northwest on 43",88,0,4,"88 m","NW",334.8],["Continue on 42",212,1,10,"0.2 km","NW",331.1,"C",356.3]]
}
So far I came up with the following code:
Dim js As New System.Web.Script.Serialization.JavaScriptSerializer
Dim lstTextAreas As Output_CloudMade() = js.Deserialize(Of Output_CloudMade())(jsontext)
I'm not sure how to define complex class, i.e. Output_CloudMade.
I'm trying something like:
Public Class RouteSummary
Private mTotalDist As Long
Private mTotalTime As Long
Private mStartPoint As String
Private mEndPoint As String
Public Property TotalDist() As Long
Get
Return mTotalDist
End Get
Set(ByVal value As Long)
mTotalDist = value
End Set
End Property
Public Property TotalTime() As Long
Get
Return mTotalTime
End Get
Set(ByVal value As Long)
mTotalTime = value
End Set
End Property
Public Property StartPoint() As String
Get
Return mStartPoint
End Get
Set(ByVal value As String)
mStartPoint = value
End Set
End Property
Public Property EndPoint() As String
Get
Return mEndPoint
End Get
Set(ByVal value As String)
mEndPoint = value
End Set
End Property
End Class
Public Class Output_CloudMade
Private mVersion As Double
Private mStatus As Long
Private mRSummary As RouteSummary
'Private mRGeometry As RouteGeometry
'Private mRInstructions As RouteInstructions
Public Property Version() As Double
Get
Return mVersion
End Get
Set(ByVal value As Double)
mVersion = value
End Set
End Property
Public Property Status() As Long
Get
Return mStatus
End Get
Set(ByVal value As Long)
mStatus = value
End Set
End Property
Public Property Summary() As RouteSummary
Get
Return mRSummary
End Get
Set(ByVal value As RouteSummary)
mRSummary = value
End Set
End Property
'Public Property Geometry() As String
' Get
' End Get
' Set(ByVal value As String)
' End Set
'End Property
'Public Property Instructions() As String
' Get
' End Get
' Set(ByVal value As String)
' End Set
'End Property
End Class
but it does not work. The problem is with complex properties, like route_summary. It is filled with "nothing". Other properties, like "status" or "version" are filled properly.
Any ideas, how to define class for the above JSON?
Can you share some working code for deserializing JSON in VB.NET?
Thanks,
Below is a sample Converter class that will take an incoming stream of JSON and convert to to an object you specify. I should note the below code is .Net 4.0. The JSON serializer in 4 is much easier to use. Let me know if you can't use 4 and I'll see if I can dig up a 3.5 version. Basically you need to create a class structure to map the JSON to a Class. I created the Route and RouteSummary classes for you. I left route_geometry and route_instructions as objects. You should create class definitions for each but this should get you started.
Imports System.IO
Imports System.Runtime.Serialization.Json
Imports System.Runtime.Serialization
<DataContract(Namespace:="")> _
Public Class Route
<DataMember(Name:="version")>
Public Property version As Double
<DataMember(Name:="status")>
Public Property status As Double
<DataMember(Name:="route_summary")>
Public Property route_summary As route_summary
<DataMember(Name:="route_geometry")>
Public Property route_geometry As Object()
<DataMember(Name:="route_instructions")>
Public Property route_instructions() As Object
End Class
<DataContract(Name:="route_summary", Namespace:="")> _
Public Class route_summary
<DataMember(Name:="total_distance")>
Public Property total_distance As Double
<DataMember(Name:="total_time")>
Public Property total_time As Double
<DataMember(Name:="start_point")>
Public Property start_point As Double
<DataMember(Name:="end_point")>
Public Property end_point As Double
End Class
Public Class Converter(Of t)
Public Function ReturnJSON(ByRef sreader As StreamReader) As t
If GetType(t).Equals(GetType(String)) Then
Dim result As Object = sreader.ReadToEnd.Replace("""", "")
Return result
Else
Dim ds As New DataContractJsonSerializer(GetType(t))
Dim result As t = DirectCast(ds.ReadObject(sreader.BaseStream), t)
ds = Nothing
Return result
End If
End Function
End Class
Sub Main()
Dim json As String = "{""version"":0.3, ""status"":0, ""route_summary"": { ""total_distance"":300, ""total_time"":14, ""start_point"":""43"", ""end_point"":""42"" }, ""route_geometry"":[[51.025421,18.647631],[51.026131,18.6471],[51.027802,18.645639]], ""route_instructions"": [[""Head northwest on 43"",88,0,4,""88 m"",""NW"",334.8],[""Continue on 42"",212,1,10,""0.2 km"",""NW"",331.1,""C"",356.3]]}"
Dim encoding As New System.Text.UTF8Encoding
Dim bytes() As Byte = encoding.GetBytes(json)
Using os As New MemoryStream
os.Write(bytes, 0, bytes.Length)
os.Position = 0
Using reader As New StreamReader(os)
Dim converter As New Converter(Of Route)
Dim output As Route
output = converter.ReturnJSON(reader)
'output contains data
End Using
End Using
End Sub
See this page for a detailed description of how to read the JSON data. http://www.json.org/