我想“组合”Fluent Assertion 的集合断言和属性断言，例如，IEnumerable使用逐个属性（可能是“嵌套”）比较（即结构相等，用函数式语言用语）断言两个是成对相等的。
具体例子：
var dic = new Dictionary<int, string>() { {1, "hi"}, {2, "bye" } };
var actual = dic.ToSelectListItems(0).OrderBy(si => si.Text);
var expected = new List<SelectListItem>() {
new SelectListItem() {Selected = false, Text="bye", Value="2"},
new SelectListItem() {Selected = false, Text="hi", Value="1"}
};
ToSelectListItems在这里，我编写了一个将 a 转换Dictionary为IEnumerableof s的扩展方法SelectListItem（来自 ASP.NET MVC）。我想断言actual并且expected“结构上”相等，注意引用类型SelectListItem不会覆盖Equals 并因此默认使用引用相等。
更新
目前使用以下手动解决方案，仍然希望在 FluentAssertions 中内置更好的东西：
public static void ShouldBeStructurallyEqualTo<T, U>(this IEnumerable<T> actual, IEnumerable<U> expected) {
actual.Should().HaveCount(expected.Count());
actual.Zip(expected).ForEach(pair => pair.Item1.ShouldHave().AllProperties().IncludingNestedObjects().EqualTo(pair.Item2));
}
（注意：Zip这是我自己的IEnumerable扩展，Tuple.Create用作默认投影）
更新 2
这是两个最小的示例：
public class FooBar {
public string Foo { get; set; }
public int Bar { get; set; }
}
public class TestClass {
[Test]
public void MinimalExample() {
List<FooBar> enumerable1 = new List<FooBar>() { new FooBar() { Foo = "x", Bar = 1 }, new FooBar() { Foo = "y", Bar = 2 } };
List<FooBar> enumerable2 = new List<FooBar>() { new FooBar() { Foo = "x", Bar = 1 }, new FooBar() { Foo = "y", Bar = 2 } };
enumerable1.ShouldHave().SharedProperties().IncludingNestedObjects().EqualTo(enumerable2);
//Test 'TestClass.MinimalExample' failed: System.Reflection.TargetParameterCountException : Parameter count mismatch.
// at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
// at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
// at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
// at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, Object[] index)
// at FluentAssertions.Assertions.PropertyEqualityValidator.AssertSelectedPropertiesAreEqual(Object subject, Object expected)
// at FluentAssertions.Assertions.PropertyEqualityValidator.Validate(UniqueObjectTracker tracker, String parentPropertyName)
// at FluentAssertions.Assertions.PropertyEqualityValidator.Validate()
// at FluentAssertions.Assertions.PropertyAssertions`1.EqualTo(Object otherObject, String reason, Object[] reasonArgs)
// at FluentAssertions.Assertions.PropertyAssertions`1.EqualTo(Object otherObject)
// MiscAssertions.cs(32,0): at TestClass.MinimalExample()
}
[Test]
public void MinimalExample2() {
IEnumerable<FooBar> enumerable1 = (new List<FooBar>() { new FooBar() { Foo = "x", Bar = 1 }, new FooBar() { Foo = "y", Bar = 2 } }).Cast<FooBar>();
FooBar[] enumerable2 = new [] { new FooBar() { Foo = "x", Bar = 1 }, new FooBar() { Foo = "y", Bar = 2 } };
enumerable1.ShouldHave().SharedProperties().IncludingNestedObjects().EqualTo(enumerable2);
//Test 'TestClass.MinimalExample2' failed: System.InvalidOperationException : Please specify some properties to include in the comparison.
// at FluentAssertions.Assertions.PropertyEqualityValidator.Validate(UniqueObjectTracker tracker, String parentPropertyName)
// at FluentAssertions.Assertions.PropertyEqualityValidator.Validate()
// at FluentAssertions.Assertions.PropertyAssertions`1.EqualTo(Object otherObject, String reason, Object[] reasonArgs)
// at FluentAssertions.Assertions.PropertyAssertions`1.EqualTo(Object otherObject)
// MiscAssertions.cs(52,0): at TestClass.MinimalExample2()
}
}