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 TryGetState_ReturnsFalseIfKeyIsUndefined()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
string result = "Old Value";
bool success = navigationEntry.TryGetState<string>("Undefined", out result);
Assert.Equal(false, success);
Assert.Equal(null, result);
}
public void TryGetState_Exception_KeyIsEmpty()
{
PageInfo navigationEntry = new PageInfo("Page Name", "Arguments");
string result;
var e = Assert.Throws<ArgumentException>(() => navigationEntry.TryGetState<string>("", out result));
Assert.Equal("The argument cannot be null or an empty string.\r\nParameter name: key", e.Message);
Assert.Equal("key", e.ParamName);
}
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_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_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 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);
}
/// <summary>
/// Populates the page with content passed during navigation. Any saved state is also
/// provided when recreating a page from a prior session.
/// </summary>
/// <param name="pageInfo">Information on the arguments and state passed to the page.</param>
public async void Activate(PageInfo pageInfo)
{
// TODO: Create an appropriate data model for your problem domain to replace the sample data
string groupId = pageInfo.GetArguments<string>();
var group = await SampleDataSource.GetGroupAsync(groupId);
this.Group = group;
this.Items = group.Items;
// Restore the selected item
string selectedItemId;
if (pageInfo.TryGetState<string>("SelectedItem", out selectedItemId))
SelectedItem = await SampleDataSource.GetItemAsync(selectedItemId);
else
SelectedItem = null;
}