VB.Net's JSON Serialization Structure

Question

VB.Net's JSON Serialization Structure

Could someone please provide guidance on the proper format for a Json? I am new to working with Json and Serialization.

I need to generate a Json from .Net in this specific format:

[[Date.UTC(2011,12,14,8), 8], [Date.UTC(2011,12,14,9), 1]]

I am close to achieving this but struggling with the formatting of my string, as it is automatically enclosed in quotes. Here is my current code snippet:

        Dim oSerializerDt As New JavaScriptSerializer()

        Dim dt As New DataTable
        dt.Columns.Add("Date", GetType(String))
        dt.Columns.Add("Count", GetType(Integer))

        objresults.GetResults(id, period)

        Dim listResults As New List(Of Object())

        Dim newDate As String
        For Each result As Application.NewResults In objresults
            newDate = "Date.UTC(" + result.EventDate.Year.ToString + "," + result.EventDate.Month.ToString + "," + result.EventDate.Day.ToString + "," + result.EventDate.Hour.ToString + ")"
            listResults.Add({newDate, result.Count})
        Next

        Return oSerializerDt.Serialize(listResults)

The generated Json looks like this, with double quotes around the time string:

[["Date.UTC(2011,12,14,8)",8],["Date.UTC(2011,12,14,9)",11]]

I would greatly appreciate any advice on how to modify my code to ensure the strings are correctly formatted. Thank you!

Best regards.

javascript asp.net vb.net json serialization

Answer 1

Answer №1

Employing Linq in conjunction with StringBuilder can streamline your code like so:

    Dim data = db.Users.Select(Function(u) New With {u.UserID, u.Username}).ToList()
    Dim serializer As New JavaScriptSerializer
    Dim builder As New StringBuilder
    For Each entry In data
        builder.Append(entry.Username)
    Next
    Dim jsonStr As String = serializer.Serialize(Convert.ToString(builder))
    Response.Write(jsonStr)

Answer 2

Employing Linq in conjunction with StringBuilder can streamline your code like so:

    Dim data = db.Users.Select(Function(u) New With {u.UserID, u.Username}).ToList()
    Dim serializer As New JavaScriptSerializer
    Dim builder As New StringBuilder
    For Each entry In data
        builder.Append(entry.Username)
    Next
    Dim jsonStr As String = serializer.Serialize(Convert.ToString(builder))
    Response.Write(jsonStr)

Answer 3

Answer №2

Your request doesn't adhere to the JSON specification (having 'Date' outside of quotes). As a result, using a JSON serializer won't work in this case. To achieve your goal, you should consider simple string manipulation instead:

Dim dt As New DataTable 
dt.Columns.Add("Date", GetType(String)) 
dt.Columns.Add("Count", GetType(Integer)) 

objresults.GetResults(id, period) 

Dim listResults As New List(Of String)

Dim newDate As String 
For Each result As Application.NewResults In objresults 
    newDate = "Date.UTC(" + result.EventDate.Year.ToString + "," + result.EventDate.Month.ToString + "," + result.EventDate.Day.ToString + "," + result.EventDate.Hour.ToString + ")" 
    listResults.Add(String.Format("[{0}, {1}]", newDate, result.Count)
Next

Return "[" + String.Join(", ", listResults) + "]"

Answer 4

Your request doesn't adhere to the JSON specification (having 'Date' outside of quotes). As a result, using a JSON serializer won't work in this case. To achieve your goal, you should consider simple string manipulation instead:

Dim dt As New DataTable 
dt.Columns.Add("Date", GetType(String)) 
dt.Columns.Add("Count", GetType(Integer)) 

objresults.GetResults(id, period) 

Dim listResults As New List(Of String)

Dim newDate As String 
For Each result As Application.NewResults In objresults 
    newDate = "Date.UTC(" + result.EventDate.Year.ToString + "," + result.EventDate.Month.ToString + "," + result.EventDate.Day.ToString + "," + result.EventDate.Hour.ToString + ")" 
    listResults.Add(String.Format("[{0}, {1}]", newDate, result.Count)
Next

Return "[" + String.Join(", ", listResults) + "]"

VB.Net's JSON Serialization Structure

Answer №1

Answer №2

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