I am working on a project that retrieves addresses from Google\'s API. I am gett

ID: 3784945 • Letter: I

Question

I am working on a project that retrieves addresses from Google's API. I am getting response from google, but I am having trouble displaying the address results(AddressList) to the radgridview. I am using a WPF application and just need to display the results to the RADGRIDVIEW. I am using 'ItemSource' to try to bind to the grid but I am getting the following error: Invalid Cross Thread Access.

CODE

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using MR.CommandBridge.Common.View;
using MR.CommandBridge.CES;
using MR.CommandBridge.Common.Controls;
using MR.CommandBridge.Common.EntityTypes;
using MR.CommandBridge.Common;
using System.IO;
using System.Text.RegularExpressions;
using Newtonsoft.Json.Linq;
using System.Collections.ObjectModel;
namespace MR.CommandBridge.VEMap.ContentApps
{
public partial class AddressSearch : ContentAppEntityView
{
public AddressSearch()
{
InitializeComponent();
}

HttpWebRequest request = null;

#region **********SEARCHING**********

private void addressInput_GotFocus(object sender, RoutedEventArgs e)
{
if (addressInput.Text == "Search")
addressInput.Text = "";
else
addressInput.SelectAll();
}

private void addressInput_LostFocus(object sender, RoutedEventArgs e)
{
if (addressInput.Text == String.Empty)
{
addressInput.Text = "Search";
searchclose.Opacity = 0;
}
else if (addressInput.Text == "Search")
searchclose.Opacity = 0;
}

private void EmptySearch_Click(object sender, RoutedEventArgs e)
{
addressInput.Text = "Search";
searchclose.Opacity = 0;
}

private void addressInput_KeyDown(object sender, KeyEventArgs e)
{
searchclose.Opacity = 1;
}

private void Enter_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter)
{
var address = addressInput.Text;

var requestUri = string.Format("http://localhost/media/TextToSpeech/TextToSpeechService.svc/getDataProxy?url=https://maps.googleapis.com/maps/api/geocode/json?address={0}&key=AIzaSyCgsNpuUoH7m6U7lqeZjlLZ3MgM15PW15o", Uri.EscapeDataString(address));
//var requestUri = string.Format(ConfigurationManager.GetAppSetting("addressSearchGeoCode", Uri.EscapeDataString(address)));

HttpWebRequest request = WebRequest.Create(requestUri) as HttpWebRequest;
request.Method = "GET";
IAsyncResult result = request.BeginGetResponse(new AsyncCallback(RequestCompleted), request);
var dodo = result;
}
}

private void RequestCompleted(IAsyncResult result)
{
var request = (HttpWebRequest)result.AsyncState;
var response = (HttpWebResponse)request.EndGetResponse(result);
Stream stream = response.GetResponseStream();

try
{
StreamReader reader = new StreamReader(stream);
string text = reader.ReadToEnd();

Regex rgx = new Regex("<.*\>");
string newResult = rgx.Replace(text, "");

JObject json = JObject.Parse(newResult);
JArray results = (JArray)json["results"];

List latList = new List();
List lngList = new List();
List AddressList = new List();

if (results.Count == 0)
{
MessageBox.Show("No results found");
}
else
{
foreach (JObject obj in results)
{
if (obj == null)
{
MessageBox.Show("Address returned no results");
}
string formattedAddress = (string)obj["formatted_address"];
AddressList.Add(formattedAddress);

double lat = (double)obj["geometry"]["location"]["lat"];
latList.Add(lat);

double lng = (double)obj["geometry"]["location"]["lng"];
lngList.Add(lng);
//TODO Add exception handling
}
this.addressGrid.ItemsSource = AddressList;
}

}
catch (Exception ex)
{
MessageBox.Show("Error" + ex.Message);
}

}

Section of XAML

GotFocus="addressInput_GotFocus" LostFocus="addressInput_LostFocus"
Text="{Binding Path=StringLibrary.Search, Source={StaticResource Strings}}" Background="Transparent" FontFamily="Segoe UI" FontSize="13"
VerticalAlignment="Center" Foreground="Gray" KeyDown="Enter_KeyDown" BorderBrush="Transparent"
BorderThickness="0">

CommandParameter="{Binding Text, ElementName=SearchTB}"/>

CommandParameter="{Binding Text, ElementName=SearchTB}"/>

ItemsSource="{Binding}" CanUserFreezeColumns="False" CanUserSelect="False"
EnableColumnVirtualization="True" EnableRowVirtualization="True" ShowGroupPanel="False" ScrollViewer.VerticalScrollBarVisibility="Visible"
CanUserDeleteRows="True" RowIndicatorVisibility="Collapsed" DataLoadMode="Asynchronous" HeaderRowStyle="{StaticResource ZoneActivityHeaderRowStyle}"
GroupPanelStyle="{StaticResource GroupPanelStyle}" Background="#00000000" VerticalGridLinesBrush="#00000000" HorizontalGridLinesBrush="#00000000" AlternationCount="2"
RowHeight="32" ShowColumnHeaders="False" RowStyle="{StaticResource ActivityRowStyle}" AlternateRowStyle="{StaticResource ActivityAlternateRowStyle}">

IsFilterable="False" ShowDistinctFilters="True" IsGroupable="False">

FontSize="12" VerticalAlignment="Top" Margin="5" TextWrapping="Wrap" />

Explanation / Answer