public static object EvaluateExpression(this Expression expr)
{
while (expr.NodeType == ExpressionType.Convert)
{
var unary = expr as UnaryExpression;
if (unary.Type.IsAssignableFrom(unary.Operand.Type))
{
expr = unary.Operand;
}
else
{
break;
}
}
var constant = expr as ConstantExpression;
if (constant != null)
{
return(constant.Value);
}
bool canCallGetField = true;
#if COREFX
canCallGetField = ProfilerInterceptor.IsProfilerAttached;
#endif
if (canCallGetField)
{
var memberAccess = expr as MemberExpression;
if (memberAccess != null)
{
var asField = memberAccess.Member as FieldInfo;
if (asField != null)
{
return(SecuredReflectionMethods.GetField(asField, memberAccess.Expression != null
? memberAccess.Expression.EvaluateExpression() : null));
}
}
}
#if !DOTNET35
var listInit = expr as ListInitExpression;
if (listInit != null)
{
var collection = Expression.Variable(listInit.NewExpression.Type);
var block = new List <Expression>
{
Expression.Assign(collection, listInit.NewExpression)
};
block.AddRange(listInit.Initializers.Select(init => Expression.Call(collection, init.AddMethod, init.Arguments.ToArray())));
block.Add(collection);
expr = Expression.Block(new[] { collection }, block.ToArray());
}
#endif
var lambda = Expression.Lambda(Expression.Convert(expr, typeof(object)));
var delg = (Func <object>)lambda.Compile();
return(ProfilerInterceptor.GuardExternal(delg));
}
public static object CreateObject(this Type type, object[] args)
{
args = args ?? NoObjects;
var constructorInfos = type.GetConstructors(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
if (constructorInfos.Length == 0 || (type.IsValueType && args.Length == 0))
{
if (args.Length > 0)
{
throw new MockException("Type has no non-default constructors.");
}
return(type.GetDefaultValue());
}
object state;
var ctor = (ConstructorInfo)MockingUtil.BindToMethod(MockingUtil.Default,
constructorInfos, ref args, null, null, null, out state);
var ctorParameters = ctor.GetParameters();
for (int i = 0; i < ctorParameters.Length; ++i)
{
var paramType = ctorParameters[i].ParameterType;
if (paramType.IsValueType && args[i] == null)
{
args[i] = paramType.GetDefaultValue();
}
else if (args[i] != null && !paramType.IsAssignableFrom(args[i].GetType()))
{
args[i] = Convert.ChangeType(args[i], paramType, System.Globalization.CultureInfo.CurrentCulture);
}
}
#if !PORTABLE
var newCall = MockingUtil.CreateDynamicMethod <Func <object[], object> >(il =>
{
il.UnpackArgArray(OpCodes.Ldarg_0, ctor);
il.PushArgArray(ctor);
il.Emit(OpCodes.Newobj, ctor);
if (type.IsValueType)
{
il.Emit(OpCodes.Box, type);
}
il.Emit(OpCodes.Ret);
});
return(ProfilerInterceptor.GuardExternal(() =>
{
try
{
return newCall(args);
}
catch (MemberAccessException ex)
{
GC.KeepAlive(ex);
return MockingUtil.CreateInstance(type, args);
}
}));
#else
return(MockingUtil.CreateInstance(type, args));
#endif
}