Here is a quick tutorial on creating a web service in VB.NET that output the data in JSON.
Imports System
Imports System.Web
Imports System.Collections
Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.Data
Imports System.Data.SqlClient
Imports System.Web.Script.Serialization
Imports System.Web.Script.Services
Imports System.ComponentModel
<System.Web.Services.WebService(Namespace:="http://tempuri.org/")> _
<System.Web.Services.WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<ToolboxItem(False)> _
Public Class config
Inherits System.Web.Services.WebService
<WebMethod()> _
<ScriptMethod(ResponseFormat:=ResponseFormat.Json)> _
Public Function getConfigurationValueByKey(ByVal strKeyName As String) As String
Dim sqlConnection As SqlConnection = New SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings("ConnStr").ConnectionString)
sqlConnection.Open()
Dim sqlCommand As SqlCommand = New SqlCommand("SELECT * FROM table1 WHERE column1 ='" + strKeyName + "';", sqlConnection)
Dim sqlDataset As DataSet = New DataSet()
Dim sqlDataAdapter As SqlDataAdapter = New SqlDataAdapter(sqlCommand)
sqlDataAdapter.Fill(sqlDataset)
sqlConnection.Close()
Dim MArray()() As String = New String(sqlDataset.Tables(0).Rows.Count)() {}
Dim i As Integer = 0
For Each rs As DataRow In sqlDataset.Tables(0).Rows
MArray(i) = New String() {rs("KeyName").ToString(), rs("ValueName").ToString()}
i = i + 1
Next
Dim js As JavaScriptSerializer = New JavaScriptSerializer()
Dim sJSON As String = js.Serialize(MArray)
Return sJSON
End Function
End Class |
Output will be something like this.
<?xml version="1.0" encoding="utf-8" ?>
<string xmlns="http://tempuri.org/">[["key1","value1"],["key2","value2"]]</string> |
