public T Ctor <T>(params object[] args)
{
//where T : new()
//if (args == null || args.Length == 0)
// return new T();
var clazz = typeof(T);
var argTypes = args.Select(e => e.GetType()).ToArray();
var key = KeyMaker.AddHashCode <Type>(clazz, KeyMaker.GetHashCode(argTypes));
ConstructorInfo constructor = null;
if (!_constructors.TryGetValue(key, out constructor))
{
constructor = clazz.GetConstructor(argTypes);
_constructors.Add(key, constructor);
}
if (constructor == null)
{
StringBuilder argMsg = new StringBuilder("(");
argTypes.ForEach(t => argMsg.Append(t.Name + ","));
if (argMsg.Length > 0)
{
argMsg.Replace(',', ')', argMsg.Length - 1, 1);
}
throw new ArgumentException("typeof(" + clazz.Name + ") has no constructor with argumtens " + argMsg);
}
T result = (T)constructor.Invoke(args);
return(result);
}
public T Copy(T source, T sink)
{
if (source == null || sink == null)
{
return(sink);
}
var clazz = typeof(T);
var sourceType = source.GetType();
var sinkType = sink.GetType();
var key = KeyMaker.GetHashCode(clazz, sourceType, sinkType);
//var delegateType = typeof(Action<,>).MakeGenericType(sourceType, sinkType);
Delegate copyAction = null;
if (!copyActionCache.TryGetValue(key, out copyAction))
{
var delegateType = typeof(Action <,>).MakeGenericType(sourceType, sinkType);
var sourceExpr = Expression.Variable(sourceType, "source");
var destExpr = Expression.Variable(sinkType, "sink");
var memberFilter = MemberFilter();
cache.AddType(sinkType, memberFilter);
var sourceMembers = cache.Members(sourceType, memberFilter);
var paras = new ParameterExpression[] { sourceExpr, destExpr };
var blockExpressions = new List <Expression>();
try {
foreach (var sourceInfo in sourceMembers)
{
if (cache.ValidMember(sinkType, sourceInfo.PropertyType, sourceInfo.Name))
{
var sourceMember = Expression.Property(sourceExpr, sourceInfo);
var destInfo = sinkType.GetProperty(sourceInfo.Name, sourceInfo.PropertyType);
var destMember = Expression.Property(destExpr, destInfo);
blockExpressions.Add(Expression.Assign(destMember, sourceMember));
}
}
var copyExpression = Expression.Lambda(delegateType, Expression.Block(blockExpressions), paras);
copyAction = copyExpression.Compile();
} catch (Exception ex) {
// Trace.WriteLine(this.GetType().Name + "-Error. Fallback to Copy3");
// return Copy3(source, sink);
throw ex;
}
copyActionCache.Add(key, copyAction);
}
copyAction.DynamicInvoke(new object[] { source, sink });
// this is slower:
//delegateType.InvokeMember("Invoke",
//BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.InvokeMethod,
//null, copyAction, new object[] { source, sink });
return(sink);
}
