private static int?Test3MethodExcepion(TestClass1 test)
{
try
{
return(test.Test2.Test3.Property);
}
catch (NullReferenceException)
{
return(null);
}
}
private static int?Test1Method(TestClass1 test)
{
if (test == null)
{
return(null);
}
var s1 = test.Test2;
if (s1 == null)
{
return(null);
}
var s2 = s1.Test3;
if (s2 == null)
{
return(null);
}
return(s2.Property);
}
private static void Main()
{
var test = new TestClass1()
{
Property = 1,
Test2 = new TestClass2
{
Property = 2,
Test3 = new TestClass3 {
Property = 3
}
}
};
var test2 = new TestClass1()
{
Property = 1,
Test2 = new TestClass2
{
Property = 2,
}
};
Console.WriteLine("Reference Getter (TestClass1 t) => t.Test2.Test3");
var referenceGetter = CreateReferenceGetter((TestClass1 t) => t.Test2.Test3);
var reference = referenceGetter(test);
Console.WriteLine("Reference: (test)" + (reference != null ? reference.ToString() : "null"));
reference = referenceGetter(new TestClass1());
Console.WriteLine("Reference (new TestClass1()): " + (reference != null ? reference.ToString() : "null"));
var f3 = CreateValueGetter((TestClass1 t) => t.Test2.GetTest3(1, null).Property);
var s = f3(test);
Console.WriteLine(s.HasValue ? s.ToString() : "null");
var f2 = CreateValueGetter((TestClass1 t) => t.Test2.GetTest3(1).Property);
s = f2(test);
Console.WriteLine(s.HasValue ? s.ToString() : "null");
var f1 = CreateValueGetter((TestClass1 t) => t.Test2.GetTest3().Property);
s = f1(test);
Console.WriteLine(s.HasValue ? s.ToString() : "null");
Console.WriteLine("test.Test2.Test3.Property = 3");
var f5 = CreateValueGetter(
(TestClass1 t1, TestClass1 t2) => t2.Test2.Test3.Property == 3 || t1.Test2.Test3.Property == 3);
var s2 = f5(test, test2);
Console.WriteLine(s.HasValue ? s2.ToString() : "null");
Console.WriteLine("test.Test2.Test3.Property = 0");
test.Test2.Test3.Property = 0;
s = f1(test);
Console.WriteLine(s.HasValue ? s.ToString() : "null");
Console.WriteLine("test.Test2.Test3.Property = 99");
test.Test2.Test3.Property = 99;
s = f1(test);
Console.WriteLine(s.HasValue ? s.ToString() : "null");
Console.WriteLine("test = null");
test = null;
s = f1(test);
Console.WriteLine(s.HasValue ? s.ToString() : "null");
Console.WriteLine("test = new TestClass1 { Property = 5 }");
test = new TestClass1 {
Property = 5
};
s = f1(test);
Console.WriteLine(s.HasValue ? s.ToString() : "null");
Console.WriteLine("test = new TestClass1 { Test2 = new TestClass2() }");
test = new TestClass1 {
Test2 = new TestClass2()
};
s = f1(test);
Console.WriteLine(s.HasValue ? s.ToString() : "null");
test = new TestClass1()
{
Property = 1,
Test2 = new TestClass2
{
Property = 2,
Test3 = new TestClass3 {
Property = 3
}
}
};
var count = 1;
Console.WriteLine("ValueGetter");
var stopwatch = new Stopwatch();
stopwatch.Start();
for (var i = 0; i < count; i++)
{
s = f1(test);
}
stopwatch.Stop();
Console.WriteLine(stopwatch.ElapsedTicks);
Console.WriteLine("Test1Method");
stopwatch.Reset();
stopwatch.Start();
for (var i = 0; i < count; i++)
{
s = Test1Method(test);
}
stopwatch.Stop();
Console.WriteLine(stopwatch.ElapsedTicks);
Console.WriteLine("Test2Method");
stopwatch.Reset();
stopwatch.Start();
for (var i = 0; i < count; i++)
{
s = Test2Method(test);
}
stopwatch.Stop();
Console.WriteLine(stopwatch.ElapsedTicks);
Console.WriteLine("Test3MethodExcepion");
stopwatch.Reset();
stopwatch.Start();
for (var i = 0; i < count; i++)
{
s = Test3MethodExcepion(test);
}
stopwatch.Stop();
Console.WriteLine(stopwatch.ElapsedTicks);
count = 1000;
Console.WriteLine("ValueGetter");
stopwatch.Reset();
stopwatch.Start();
for (var i = 0; i < count; i++)
{
s = f1(test);
}
stopwatch.Stop();
Console.WriteLine(stopwatch.ElapsedTicks);
Console.WriteLine("Test1Method");
stopwatch.Reset();
stopwatch.Start();
for (var i = 0; i < count; i++)
{
s = Test1Method(test);
}
stopwatch.Stop();
Console.WriteLine(stopwatch.ElapsedTicks);
Console.WriteLine("Test2Method");
stopwatch.Reset();
stopwatch.Start();
for (var i = 0; i < count; i++)
{
s = Test2Method(test);
}
stopwatch.Stop();
Console.WriteLine(stopwatch.ElapsedTicks);
Console.WriteLine("Test3MethodExcepion");
stopwatch.Reset();
stopwatch.Start();
for (var i = 0; i < count; i++)
{
s = Test3MethodExcepion(test);
}
stopwatch.Stop();
Console.WriteLine(stopwatch.ElapsedTicks);
Console.WriteLine("ValueGetter");
stopwatch.Reset();
stopwatch.Start();
for (var i = 0; i < count; i++)
{
s = f1(test);
}
stopwatch.Stop();
Console.WriteLine(stopwatch.ElapsedTicks);
Console.WriteLine("Test1Method");
stopwatch.Reset();
stopwatch.Start();
for (var i = 0; i < count; i++)
{
s = Test1Method(test);
}
stopwatch.Stop();
Console.WriteLine(stopwatch.ElapsedTicks);
Console.WriteLine("Test2Method");
stopwatch.Reset();
stopwatch.Start();
for (var i = 0; i < count; i++)
{
s = Test2Method(test);
}
stopwatch.Stop();
Console.WriteLine(stopwatch.ElapsedTicks);
Console.WriteLine("Test3MethodExcepion");
stopwatch.Reset();
stopwatch.Start();
for (var i = 0; i < count; i++)
{
var r = Test3MethodExcepion(test);
}
stopwatch.Stop();
Console.WriteLine(stopwatch.ElapsedTicks);
}
private static int?Test2Method(TestClass1 test)
{
return(test?.Test2?.Test3?.Property);
}