In my XamarinForms project I am trying to bind a label text to a property of a class. when I pass in the object to my view the label is not being populated. can someone see what I am doing wrong?
In my view model I have
class ManagerLevelPageViewModel : INotifyPropertyChanged
{
private UserSelections _MyUserSelections;
public UserSelections MyUserSelections
{
get { return _MyUserSelections; }
set {
_MyUserSelections = value;
NotifyPropertyChanged();
}
}
public ManagerLevelPageViewModel(UserSelections _temp)
{
MyUserSelections = _temp;
MyUserSelections.selectedClientName = _temp.selectedClientName;
//myUserSelections = _myUserSelections;
//SetValues();
}
here is the class
public class UserSelections
{
public int selectedClientId { get; set; }
public string selectedClientName { get; set; }
public string selectedClientShortCode { get; set; }
public decimal selectedClientPL { get; set; }
public string TopdayIdentifier { get; set; }
}
here is the view.cs
ManagerLevelPageViewModel vm;
public ManagerLevelPage (UserSelections _myUserSelections)
{
vm = new ManagerLevelPageViewModel(_myUserSelections);
InitializeComponent ();
BindingContext = vm;
DownloadData();
}
lastly here is the xaml
<Label Text="{Binding MyUserSelections.ClientName}"/>
notify property changed
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged([CallerMemberName] string propertyName = "")
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
I am building a testing framework, my objective is to test many websites that have similar pages with light difference between each other using this framework.
I have an issue where I want WebElements Selectors to be dynamic, which means that I want to pass the way I want to find the element as a parameter to FindElement method.
I am trying to build something like this:
public class WebComponent
{
public int ID { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public IWebElement WebElement{get;set;}
public Accessor Accessor { get; set; }
public WebComponent()
{
Accessor = new Accessor();
}
}
public class Accessor
{
OpenQA.Selenium.By By { get; set; }
public string Value { get; set; }
}
And later in my code when I want to have instance of this class:
WebComponent component = new WebComponent();
component.ID = 1;
component.Name = "Logout Button";
component.Description = "The button to click when user wants to logout of website";
component.Accessor.By = By.Id;
component.Accessor.Value = "logout";
component.WebElement = Browser.Driver.FindElement(//missing code);
My question is how can I find the WebElement using component.Accessor, any advice or suggested edits will be much appreciated.
By.Id is a method group, you can't assign it to type OpenQA.Selenium.By. The assignment should be
component.Accessor.By = By.id("logout"); // or any other By and value.
And then you can locate the element using
component.WebElement = Browser.Driver.FindElement(component.Accessor.By);
Edit
To choose the locator and value dynamically you can do something like
private By chooseType(String locatorType, string value) {
switch(locatorType) {
case "id":
return By.id(value);
case "class":
return By.className(value);
//...
}
}
I have the following class:
public class Widget {
public virtual int Id { get; set; }
[Required]
public virtual WidgetType Type { get; set; }
public virtual string SerializedParameters {
get {
return new XmlSerializer(Parameters.GetType()).Serialize(Parameters);
} set {
Parameters = new XmlSerializer(Assembly
.LoadFrom(Server.MapPath(Type.ModelAssembly))
.GetType(Type.ModelClass)
).Deserialize(value);
}
}
private object _parameters;
public virtual object Parameters {
get {
if (_parameters == null)
_parameters = Activator.CreateInstance(Assembly
.LoadFrom(Server.MapPath(Type.ModelAssembly))
.GetType(Type.ModelClass)
);
return _parameters;
} set { _parameters = value; }
}
}
The Parameters property is not mapped to the database but the SerializedParameters property is. However when it tries to get the information from the database and set the SerializedParameters (which subsequently sets the Parameters) the Type property is null and therefore an exception is thrown. I guess this depends on the order in which NHibernate sets the properties for the Widget but i can't get it to work.
I was wondering if there was a way around this. Appreciate the help. Thanks
moved the deserialization in the getter from the setter because as you said the type is not there yet
public class Widget
{
public virtual int Id { get; set; }
public virtual WidgetType Type { get; set; }
private string _serializedParameters;
private virtual string SerializedParameters {
get
{
return new XmlSerializer(Parameters.GetType()).Serialize(Parameters);
}
set
{
_serializedParameters = value;
}
}
private object _parameters;
public virtual object Parameters
{
get
{
if (_parameters == null)
{
if (!string.IsNullOrEmpty(serializedParameters))
{
// code to deserialize the Parameters and set to Parameters
_parameters = new XmlSerializer(Assembly
.LoadFrom(Server.MapPath(Type.ModelAssembly))
.GetType(Type.ModelClass)
).Deserialize(value);
}
else
{
// no existing parameters, then create new object
_parameters = Activator.CreateInstance(Assembly.LoadFrom(Server.MapPath("~/bin/" + widget.Type.ParametersAssembly + ".dll")).GetType(widget.Type.ParametersClass));
}
}
return _parameters;
}
set { _parameters = value; }
}
}
My application has the following classes:
public class Widget {
public virtual int Id { get; set; }
public virtual WidgetType Type { get; set; }
public virtual string Parameters { get; set; }
}
public class WidgetType {
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual string ParametersAssembly { get; set; }
public virtual string ParametersClass { get; set; }
}
Now if i'd like to update the Parameters for a particular widget i would say something like:
// Get the widget
var widget = GetWidget(1);
// Create an instance of the type parameters class
var parameters = Activator.CreateInstance(Assembly.LoadFrom(Server.MapPath("~/bin/"
+ widget.Type.ParametersAssembly + ".dll")).GetType(widget.Type.ParametersClass));
... Code here to update the parameters
widget.Parameters = new XmlSerializer(parameters.GetType()).Serialize(parameters);
I have to do the reverse when i wish to get the parameters. You can imagine this becomes quite tedious. I was wondering if it was possibly to automatically do this?
I've been looking at the IUserType interface. I found an article which is kind of similar. However my problem is a little more complicated as my type changes based on the type of the widget.
I'd appreciate it if someone could let me know if this is possible and possibly how it could be achieved. Thanks
an easy way
public class Widget
{
public virtual int Id { get; set; }
public virtual WidgetType Type { get; set; }
private string _serializedParameters;
private virtual string SerializedParameters {
get
{
return new XmlSerializer(Parameters.GetType()).Serialize(Parameters);
}
set
{
_serializedParameters = value;
// code to deserialize the Parameters and set to Parameters
var ptype = Assembly.LoadFrom(Server.MapPath("~/bin/" + widget.Type.ParametersAssembly + ".dll")).GetType(widget.Type.ParametersClass);
Parameters = Activator.CreateInstance(ptype);
}
}
private object _parameters;
public virtual object Parameters
{
get
{
if (_parameters == null)
_parameters = Activator.CreateInstance(Assembly.LoadFrom(Server.MapPath("~/bin/" + widget.Type.ParametersAssembly + ".dll")).GetType(widget.Type.ParametersClass));
return _parameters;
}
set { _parameters = value; }
}
}
it can't be in the Parameters property because then you have to get -> alter -> set instead of get -> alter. But you are right that building the parameters object should go in the getter of Parameters because only there we can be sure to have the WidgetType loaded
it is essentially the same as a UserType except that we know that WidgetType is there
I'm using JSON.Net to try and deserialize some survey responses from SurveyGizmo.
Here's a snapshot of the data I'm reading in:
{"result_ok":true,
"total_count":"44",
"page":1,
"total_pages":1,
"results_per_page":50,
"data":[
{"id":"1",
"contact_id":"",
"status":"Complete",
"is_test_data":"0",
"datesubmitted":"2011-11-13 22:26:53",
"[question(59)]":"11\/12\/2011",
"[question(60)]":"06:15 pm",
"[question(62)]":"72",
"[question(63)]":"One",
"[question(69), option(10196)]":"10",
I've setup a class as far as datesubmitted but I'm not sure how to setup the class to deserialize the questions given that the amount of questions will change? I also need to capture the option if it's present.
I'm using this code to use the JSON.NET Deserialize function:
Dim responses As Responses = JsonConvert.DeserializeObject(Of Responses)(fcontents)
Classes:
Public Class Responses
Public Property result_OK As Boolean
Public Property total_count As Integer
Public Property page As Integer
Public Property total_pages As Integer
Public Property results_per_page As Integer
Public Overridable Property data As List(Of surveyresponse)
End Class
Public Class SurveyResponse
Public Property id As Integer
Public Property status As String
Public Property datesubmitted As Date
End Class
This trick to support totally crazy mappings is to use JsonConverter and completely replace the parsing for that object, (I apologize for the C#, but I'm no good at VB syntax):
class Program
{
static void Main(string[] args)
{
var result = JsonConvert.DeserializeObject<Responses>(TestData);
}
const string TestData = #"{""result_ok"":true,
""total_count"":""44"",
""page"":1,
""total_pages"":1,
""results_per_page"":50,
""data"":[
{""id"":""1"",
""contact_id"":"""",
""status"":""Complete"",
""is_test_data"":""0"",
""datesubmitted"":""2011-11-13 22:26:53"",
""[question(59)]"":""11\/12\/2011"",
""[question(60)]"":""06:15 pm"",
""[question(62)]"":""72"",
""[question(63)]"":""One"",
""[question(69), option(10196)]"":""10"",
}]}";
}
[JsonObject]
class Responses
{
public bool result_ok { get; set; }
public string total_count { get; set; }
public int page { get; set; }
public int total_pages { get; set; }
public int results_per_page { get; set; }
public SurveyResponse[] Data { get; set; }
}
[JsonObject]
// Here is the magic: When you see this type, use this class to read it.
// If you want, you can also define the JsonConverter by adding it to
// a JsonSerializer, and parsing with that.
[JsonConverter(typeof(DataItemConverter))]
class SurveyResponse
{
public string id { get; set; }
public string contact_id { get; set; }
public string status { get; set; }
public string is_test_data { get; set; }
public DateTime datesubmitted { get; set; }
public Dictionary<int, string> questions { get; set; }
}
class DataItemConverter : JsonConverter
{
public override bool CanConvert(Type objectType)
{
return objectType == typeof(SurveyResponse);
}
public override bool CanRead
{
get { return true; }
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
var value = (SurveyResponse)existingValue;
if (value == null)
{
value = new SurveyResponse();
value.questions = new Dictionary<int, string>()
}
// Skip opening {
reader.Read();
while (reader.TokenType == JsonToken.PropertyName)
{
var name = reader.Value.ToString();
reader.Read();
// Here is where you do your magic
if (name.StartsWith("[question("))
{
int index = int.Parse(name.Substring(10, name.IndexOf(')') - 10));
value.questions[index] = serializer.Deserialize<string>(reader);
}
else
{
var property = typeof(SurveyResponse).GetProperty(name);
property.SetValue(value, serializer.Deserialize(reader, property.PropertyType), null);
}
// Skip the , or } if we are at the end
reader.Read();
}
return value;
}
public override bool CanWrite
{
get { return false; }
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
throw new NotImplementedException();
}
}
Now obviously there's a lot more you would want to do to get this really robust, but this gives you the basics of how to do it. There are more lightweight alternatives if you simply need to change property names (either JsonPropertyAttribute or overriding DefaultContractResolver.ResolvePropertyName(), but this gives you full control.