public static void Main()
{
var test = "Test";
Expression <Func <Cat, string> > expression = cat => cat.SayMew(test);
var list = new List <string>();
var stopwatch = Stopwatch.StartNew();
for (int i = 0; i < 10000; i++)
{
var body = expression.Body as MethodCallExpression;
var argument = body.Arguments[0];
// () => (object)test;
var converted = Expression.Convert(argument, typeof(object));
var lambda = Expression.Lambda <Func <object> >(converted);
var func = lambda.Compile();
list.Add(func() as string);
}
Console.WriteLine($"{stopwatch.Elapsed} - Extracting with normal expression and convert");
Console.WriteLine(list.Count);
list = new List <string>();
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < 10000; i++)
{
var body = expression.Body as MethodCallExpression;
var argument = body.Arguments[0];
// () => (object)test;
var converted = Expression.Convert(argument, typeof(object));
var lambda = Expression.Lambda <Func <object> >(converted);
var func = lambda.CompileFast();
list.Add(func() as string);
}
Console.WriteLine($"{stopwatch.Elapsed} - Extracting with fast compiled expression and convert");
Console.WriteLine(list.Count);
list = new List <string>();
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < 10000; i++)
{
var body = expression.Body as MethodCallExpression;
var argument = body.Arguments[0];
var argumentMember = argument as MemberExpression;
var closureClass = argumentMember.Expression as ConstantExpression;
var closureClassValue = closureClass.Value;
var fieldInfo = argumentMember.Member as FieldInfo;
var value = fieldInfo.GetValue(closureClassValue);
list.Add(value as string);
}
Console.WriteLine($"{stopwatch.Elapsed} - Extracting with reflection");
Console.WriteLine(list.Count);
list = new List <string>();
var bodyCold = expression.Body as MethodCallExpression;
var argumentCold = bodyCold.Arguments[0];
var argumentMemberCold = argumentCold as MemberExpression;
var closureClassCold = argumentMemberCold.Expression as ConstantExpression;
var closureClassValueCold = closureClassCold.Value;
MemberHelper.GetMembers(closureClassValueCold.GetType());
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < 10000; i++)
{
var body = expression.Body as MethodCallExpression;
var argument = body.Arguments[0];
var argumentMember = argument as MemberExpression;
var closureClass = argumentMember.Expression as ConstantExpression;
var closureClassValue = closureClass.Value;
var members = MemberHelper.GetMembers(closureClassValue.GetType());
var value = members[0].Getter(closureClassValue);
list.Add(value as string);
}
Console.WriteLine($"{stopwatch.Elapsed} - Extracting with reflection and compiled delegates");
Console.WriteLine(list.Count);
list = new List <string>();
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < 10000; i++)
{
var slowExpression = new SlowExpression();
var value = slowExpression.BuildSlowExpression();
list.Add(value);
}
Console.WriteLine($"{stopwatch.Elapsed} - Building with slow expression");
Console.WriteLine(list.Count);
list = new List <string>();
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < 10000; i++)
{
var slowExpression = new SlowExpressionWithFastCompile();
var value = slowExpression.BuildSlowExpression();
list.Add(value);
}
Console.WriteLine($"{stopwatch.Elapsed} - Building with slow expression and fast compile");
Console.WriteLine(list.Count);
list = new List <string>();
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < 10000; i++)
{
var slowExpression = new FastExpression();
var value = slowExpression.BuildFastExpression();
list.Add(value);
}
Console.WriteLine($"{stopwatch.Elapsed} - Building with fast expression");
Console.WriteLine(list.Count);
}
static void Main(string[] args)
{
var text = "Use expression trees";
Expression <Func <Cat, string> > sayMewExpression = cat => cat.SayMew(text);
List <string> list = new List <string>();
Stopwatch stopwatch = Stopwatch.StartNew();
for (int i = 0; i < OperationsCount; i++)
{
MethodCallExpression body = sayMewExpression.Body as MethodCallExpression;
Expression argument = body.Arguments[0];
// () => (object)test;
UnaryExpression converted = Expression.Convert(argument, typeof(object));
Expression <Func <object> > lambda = Expression.Lambda <Func <object> >(converted);
Func <object> func = lambda.Compile();
string value = func() as string;
list.Add(value);
}
Console.WriteLine($"{stopwatch.Elapsed} - Extracting using normal expression compiler");
list = new List <string>();
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < OperationsCount; i++)
{
MethodCallExpression body = sayMewExpression.Body as MethodCallExpression;
Expression argument = body.Arguments[0];
// () => (object)test;
UnaryExpression converted = Expression.Convert(argument, typeof(object));
Expression <Func <object> > lambda = Expression.Lambda <Func <object> >(converted);
Func <object> func = lambda.CompileFast();
string value = func() as string;
list.Add(value);
}
Console.WriteLine($"{stopwatch.Elapsed} - Extracting using fast expression compiler");
list = new List <string>();
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < OperationsCount; i++)
{
MethodCallExpression body = sayMewExpression.Body as MethodCallExpression;
Expression argument = body.Arguments[0];
MemberExpression arguemntMemeber = argument as MemberExpression;
ConstantExpression closureClassExpression = arguemntMemeber.Expression as ConstantExpression;
object closureClass = closureClassExpression.Value;
FieldInfo clasureClassFieldInfo = arguemntMemeber.Member as FieldInfo;
string value = (string)clasureClassFieldInfo.GetValue(closureClass);
list.Add(value);
}
Console.WriteLine($"{stopwatch.Elapsed} - Extracting with reflection");
list = new List <string>();
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < OperationsCount; i++)
{
string value = NormalExpression.BuildExpression();
list.Add(value);
}
Console.WriteLine($"{stopwatch.Elapsed} - Building with normal expression");
list = new List <string>();
stopwatch = Stopwatch.StartNew();
for (int i = 0; i < OperationsCount; i++)
{
string value = FastExpression.BuildExpression();
list.Add(value);
}
Console.WriteLine($"{stopwatch.Elapsed} - Building with normal expression and using fast compile");
}