public object GetValue(object instance)
{
if (null == this._valueGetter)
{
if (Monitor.TryEnter(this))
{
try
{
if (null == this._valueGetter)
{
this._valueGetter = MemberValueGetterContainer.GetMemberValueGetter(this.Definition.Property);
}
}
finally
{
Monitor.Exit(this);
}
}
else
{
return(this.Definition.Property.GetMemberValue(instance));
}
}
return(this._valueGetter(instance));
}
public static MemberValueGetter CreateValueGetter(MemberInfo propertyOrField)
{
ParameterExpression p = Expression.Parameter(typeof(object), "a");
Expression instance = null;
if (!propertyOrField.IsStaticMember())
{
instance = Expression.Convert(p, propertyOrField.DeclaringType);
}
var memberAccess = Expression.MakeMemberAccess(instance, propertyOrField);
Type type = ReflectionExtension.GetMemberType(propertyOrField);
Expression body = memberAccess;
if (type.IsValueType)
{
body = Expression.Convert(memberAccess, typeof(object));
}
var lambda = Expression.Lambda <MemberValueGetter>(body, p);
MemberValueGetter ret = lambda.Compile();
return(ret);
}
public static MemberValueGetter GetMemberValueGetter(MemberInfo memberInfo)
{
MemberValueGetter getter = Cache.GetOrAdd(memberInfo, member =>
{
return(DelegateGenerator.CreateValueGetter(member));
});
return(getter);
}
public object GetValue(object instance)
{
if (null == this._valueGetter)
{
this._valueGetter = MemberValueGetterContainer.GetMemberValueGetter(this.Definition.Property);
}
return(this._valueGetter(instance));
}
public static MemberValueGetter GetMemberValueGetter(MemberInfo memberInfo)
{
MemberValueGetter getter = null;
if (!Cache.TryGetValue(memberInfo, out getter))
{
lock (memberInfo)
{
if (!Cache.TryGetValue(memberInfo, out getter))
{
getter = DelegateGenerator.CreateValueGetter(memberInfo);
Cache.GetOrAdd(memberInfo, getter);
}
}
}
return(getter);
}
public static object FastGetMemberValue(this MemberInfo propertyOrField, object obj)
{
MemberValueGetter getter = MemberValueGetterContainer.GetMemberValueGetter(propertyOrField);
return(getter(obj));
}