public static void CopyToTest()
{
string[] anArray = new string[] { "one", "two", "three", "four" };
ObservableCollection<string> collection = new ObservableCollection<string>((IEnumerable<string>)anArray);
string[] aCopy = new string[collection.Count];
collection.CopyTo(aCopy, 0);
for (int i = 0; i < anArray.Length; ++i)
Assert.Equal(anArray[i], aCopy[i]);
// copy observable collection starting in middle, where array is larger than source.
aCopy = new string[collection.Count + 2];
int offsetIndex = 1;
collection.CopyTo(aCopy, offsetIndex);
for (int i = 0; i < aCopy.Length; i++)
{
string value = aCopy[i];
if (i == 0)
Assert.True(null == value, "Should not have a value since we did not start copying there.");
else if (i == (aCopy.Length - 1))
Assert.True(null == value, "Should not have a value since the collection is shorter than the copy array..");
else
{
int indexInCollection = i - offsetIndex;
Assert.Equal(collection[indexInCollection], aCopy[i]);
}
}
}
public static void CopyToTest_Negative()
{
string[] anArray = new string[] { "one", "two", "three", "four" };
ObservableCollection<string> collection = new ObservableCollection<string>(anArray);
int[] iArrInvalidValues = new Int32[] { -1, -2, -100, -1000, -10000, -100000, -1000000, -10000000, -100000000, -1000000000, Int32.MinValue };
foreach (var index in iArrInvalidValues)
{
string[] aCopy = new string[collection.Count];
Assert.Throws<ArgumentOutOfRangeException>(() => collection.CopyTo(aCopy, index));
}
int[] iArrLargeValues = new Int32[] { collection.Count, Int32.MaxValue, Int32.MaxValue / 2, Int32.MaxValue / 10 };
foreach (var index in iArrLargeValues)
{
string[] aCopy = new string[collection.Count];
Assert.Throws<ArgumentException>(() => collection.CopyTo(aCopy, index));
}
Assert.Throws<ArgumentNullException>(() => collection.CopyTo(null, 1));
string[] copy = new string[collection.Count - 1];
Assert.Throws<ArgumentException>(() => collection.CopyTo(copy, 0));
copy = new string[0];
Assert.Throws<ArgumentException>(() => collection.CopyTo(copy, 0));
}
public void Test_ObservableCollection_CopyTo()
{
var list = new ObservableCollection<int>() { 6, 5, 8 };
var array = new int[5];
list.CopyTo(array, 1);
Assert.Equal(0, array[0]);
Assert.Equal(6, array[1]);
Assert.Equal(5, array[2]);
Assert.Equal(8, array[3]);
Assert.Equal(0, array[4]);
}
