/// <summary>
/// 获取属性值
/// </summary>
/// <param name="target">拥有该成员的类实例</param>
/// <returns></returns>
private object Get(object target)
{
if (!_member.CanRead)
{
throw new XFrameworkException("{0} is unreadable", base.FullName);
}
if (_get == null)
{
_get = PropertyInvoker.InitializeGetInvoke(this);
}
return(_get(target));
}
/// <summary>
/// 设置属性值
/// </summary>
/// <param name="target">拥有该成员的类实例</param>
/// <param name="value">字段/属性值</param>
private void Set(object target, object value)
{
if (!_member.CanWrite)
{
throw new XFrameworkException("{0} is unwritable", base.FullName);
}
//value = value ?? TypeUtils.GetNullValue(_member.PropertyType);
//if (value != null)
//{
// if (value.GetType() != this.DataType) value = Convert.ChangeType(value, this.DataType);
//}
_set = _set ?? PropertyInvoker.InitializeSetInvoke(this);
_set(target, value ?? TypeUtils.GetNullValue(_member.PropertyType));
}
// 初始化 Set 动态方法
static Action <object, object> InitializeSetInvoke(PropertyInvoker invoke)
{
MethodInfo method = invoke.SetMethod;
DynamicMethod dynamicMethod = new DynamicMethod(method.Name, null, new Type[] { typeof(object), typeof(object) }, method.Module);
ILGenerator g = dynamicMethod.GetILGenerator();
Type paramType = method.GetParameters()[0].ParameterType;
if (!method.IsStatic)
{
g.Emit(OpCodes.Ldarg_0); //Load the first argument (target object)
g.Emit(OpCodes.Castclass, method.DeclaringType); //Cast to the source type
}
g.Emit(OpCodes.Ldarg_1); //Load the second argument (value object)
g.EmitCast(paramType);
g.EmitCall(method.IsVirtual ? OpCodes.Callvirt : OpCodes.Call, method, null); //Set the property value
g.Emit(OpCodes.Ret);
return(dynamicMethod.CreateDelegate(typeof(Action <object, object>)) as Action <object, object>);
}
// 初始化 Get 动态方法
static Func <object, object> InitializeGetInvoke(PropertyInvoker invoke)
{
MethodInfo method = invoke.GetMethod;
DynamicMethod dynamicMethod = new DynamicMethod(method.Name, typeof(object), new Type[] { typeof(object) }, method.Module);
ILGenerator g = dynamicMethod.GetILGenerator();
if (!method.IsStatic)
{
g.Emit(OpCodes.Ldarg_0); //Load the first argument,(target object)
g.Emit(OpCodes.Castclass, invoke.Member.DeclaringType); //Cast to the source type
}
g.EmitCall(method.IsVirtual ? OpCodes.Callvirt : OpCodes.Call, method, null); //Get the property value
if (method.ReturnType.IsValueType)
{
g.Emit(OpCodes.Box, method.ReturnType); //Box if necessary
}
g.Emit(OpCodes.Ret);
return(dynamicMethod.CreateDelegate(typeof(Func <object, object>)) as Func <object, object>);
}
/// <summary>
/// 创建成员反射器
/// </summary>
/// <param name="member">元数据</param>
/// <returns></returns>
public static MemberInvokerBase Create(MemberInfo member)
{
MemberInvokerBase invoker = null;
if (member.MemberType == MemberTypes.Property)
{
invoker = new PropertyInvoker((PropertyInfo)member);
}
if (member.MemberType == MemberTypes.Field)
{
invoker = new FieldInvoker((FieldInfo)member);
}
if (member.MemberType == MemberTypes.Method)
{
invoker = new MethodInvoker((MethodInfo)member);
}
if (invoker == null)
{
throw new XFrameworkException("{0}.{1} not supported", member.ReflectedType, member.Name);
}
return(invoker);
}