public void Serialization_PersistsState_Struct()
{
PageInfo sourceEntry = new PageInfo("Page Name", "Arguments");
sourceEntry.SetState<StructState>("MyKey", new StructState() { Text = "Text Value", Number = 42 });
byte[] data = SerializationHelper.SerializeToArray(sourceEntry);
PageInfo newEntry = SerializationHelper.DeserializeFromArray<PageInfo>(data);
var state = newEntry.GetState<StructState>("MyKey");
Assert.Equal("Text Value", state.Text);
Assert.Equal(42, state.Number);
}
public void Serialization_PersistsState_NullClass()
{
PageInfo sourceEntry = new PageInfo("Page Name", "Arguments");
sourceEntry.SetState<ClassState>("MyKey", null);
byte[] data = SerializationHelper.SerializeToArray(sourceEntry);
PageInfo newEntry = SerializationHelper.DeserializeFromArray<PageInfo>(data);
Assert.Equal(null, newEntry.GetState<ClassState>("MyKey"));
}
public void SetState_RaisesStateChangedEvent()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
List<string> stateChangedKeys = new List<string>();
navigationEntry.StateChanged += (sender, e) => { stateChangedKeys.Add(e.StateKey); };
navigationEntry.SetState<string>("MyKey", "Test State");
Assert.Equal(new[] { "MyKey" }, stateChangedKeys);
}
public void SetState_Exception_KeyIsEmpty()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
var e = Assert.Throws<ArgumentException>(() => navigationEntry.SetState<string>("", "Test"));
Assert.Equal("The argument cannot be null or an empty string.\r\nParameter name: key", e.Message);
Assert.Equal("key", e.ParamName);
}
public void TryGetState_Exception_IncorrectType()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
navigationEntry.SetState<string>("MyKey", "Test State");
int result;
var e = Assert.Throws<InvalidCastException>(() => navigationEntry.TryGetState<int>("MyKey", out result));
Assert.Equal("Specified cast is not valid.", e.Message);
}
public void SetState_SameStateKeyOverwritesPreviousValue()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
navigationEntry.SetState<string>("MyKey", "State A");
navigationEntry.SetState<string>("MyKey", "State B");
string result;
bool success = navigationEntry.TryGetState<string>("MyKey", out result);
Assert.Equal(true, success);
Assert.Equal("State B", result);
}
public void TryGetSetState_Class_StoresNullState()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
navigationEntry.SetState<ClassState>("MyKey", null);
ClassState result;
bool success = navigationEntry.TryGetState<ClassState>("MyKey", out result);
Assert.Equal(true, success);
Assert.Equal(null, result);
}
public void TryGetSetState_Struct_StoresState()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
navigationEntry.SetState<StructState>("MyKey", new StructState() { Text = "Text Value", Number = 42 });
StructState result;
bool success = navigationEntry.TryGetState<StructState>("MyKey", out result);
Assert.Equal(true, success);
Assert.Equal("Text Value", result.Text);
Assert.Equal(42, result.Number);
}
public void TryGetSetState_String_StoresState()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
navigationEntry.SetState<string>("MyKey", "Test State");
string result;
bool success = navigationEntry.TryGetState<string>("MyKey", out result);
Assert.Equal(true, success);
Assert.Equal("Test State", result);
}
public void TryGetSetState_Int_StoresState()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
navigationEntry.SetState<int>("MyKey", 42);
int result;
bool success = navigationEntry.TryGetState<int>("MyKey", out result);
Assert.Equal(true, success);
Assert.Equal(42, result);
}
public void GetSetState_Struct_StoresState()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
navigationEntry.SetState<StructState>("MyKey", new StructState() { Text = "Text Value", Number = 42 });
var result = navigationEntry.GetState<StructState>("MyKey");
Assert.Equal("Text Value", result.Text);
Assert.Equal(42, result.Number);
}
public void GetSetState_Class_StoresNullState()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
navigationEntry.SetState<ClassState>("MyKey", null);
var result = navigationEntry.GetState<ClassState>("MyKey");
Assert.Equal(null, result);
}
public void GetSetState_Int_StoresState()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
navigationEntry.SetState<int>("MyKey", 42);
var result = navigationEntry.GetState<int>("MyKey");
Assert.Equal(42, result);
}
public void GetSetState_String_StoresState()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
navigationEntry.SetState<string>("MyKey", "Test State");
var result = navigationEntry.GetState<string>("MyKey");
Assert.Equal("Test State", result);
}
/// <summary>
/// Saves any state to be recreated in a future session.
/// </summary>
/// <param name="pageInfo">Object to store page state.</param>
public void SaveState(PageInfo pageInfo)
{
if (SelectedItem != null)
pageInfo.SetState<string>("SelectedItem", SelectedItem.UniqueId);
else
pageInfo.SetState<string>("SelectedItem", null);
}