public void Chaining_Dictionary()
{
var dict = new System.Collections.Generic.Dictionary <int, int> {
[1] = 2, [3] = 4
};
var sortedDict = new System.Collections.Generic.SortedDictionary <int, int> {
[1] = 2, [3] = 4
};
System.Collections.Generic.KeyValuePair <int, int> dictKvp = default(System.Collections.Generic.KeyValuePair <int, int>);
foreach (var kv in dict)
{
dictKvp = kv;
}
System.Collections.Generic.KeyValuePair <int, int> sortedDictKvp = default(System.Collections.Generic.KeyValuePair <int, int>);
foreach (var kv in sortedDict)
{
sortedDictKvp = kv;
}
Assert.AreEqual(dictKvp, dict.Last());
Assert.AreEqual(dictKvp, dict.Last(x => true));
Assert.AreEqual(dictKvp, dict.LastOrDefault());
Assert.AreEqual(dictKvp, dict.LastOrDefault(x => true));
Assert.AreEqual(sortedDictKvp, sortedDict.Last());
Assert.AreEqual(sortedDictKvp, sortedDict.Last(x => true));
Assert.AreEqual(sortedDictKvp, sortedDict.LastOrDefault());
Assert.AreEqual(sortedDictKvp, sortedDict.LastOrDefault(x => true));
}
public void Errors_Dictionary()
{
var dict = new System.Collections.Generic.Dictionary <int, int> {
[1] = 2, [3] = 4
};
var sortedDict = new System.Collections.Generic.SortedDictionary <int, int> {
[1] = 2, [3] = 4
};
try { dict.Last(null); Assert.Fail(); } catch (ArgumentNullException exc) { Assert.AreEqual("predicate", exc.ParamName); }
try { dict.LastOrDefault(null); Assert.Fail(); } catch (ArgumentNullException exc) { Assert.AreEqual("predicate", exc.ParamName); }
try { sortedDict.Last(null); Assert.Fail(); } catch (ArgumentNullException exc) { Assert.AreEqual("predicate", exc.ParamName); }
try { sortedDict.LastOrDefault(null); Assert.Fail(); } catch (ArgumentNullException exc) { Assert.AreEqual("predicate", exc.ParamName); }
}