protected override Expression VisitMember(MemberExpression e)
{
var isMember = e.Expression != null && e.Expression.NodeType == ExpressionType.Parameter;
var isNullableMember = e.Expression != null && e.Expression.NodeType == ExpressionType.MemberAccess &&
((MemberExpression)e.Expression).Expression != null &&
((MemberExpression)e.Expression).Expression.NodeType == ExpressionType.Parameter;
if (isMember || isNullableMember)
{
Nodes.AddNode(CreateNewMemberNode(e));
return(e);
}
try
{
var value = e.Evaluate();
var constantExpression = Expression.Constant(value);
return(VisitConstant(constantExpression));
}
catch
{
var memberNode = CreateNewMemberNode(e);
Nodes.AddNode(memberNode);
return(e);
}
}
protected override Expression VisitMember(MemberExpression node)
{
// 1.<>h__TransparentIdentifier3.b.Client.ClientName
// 2.<>h__TransparentIdentifier3.b.Client.ClientName.Length
// 3.<>h__TransparentIdentifier3.b.Client.Address.AddressName
// 4.<>h__TransparentIdentifier3.b.ClientName
// <>h__TransparentIdentifier2.<>h__TransparentIdentifier3.b.ClientName
// <>h__TransparentIdentifier2.<>h__TransparentIdentifier3.b.Client.ClientName
// <>h__TransparentIdentifier2.<>h__TransparentIdentifier3.b.Client.Address.AddressName
// 5.b.ClientName
_visitedMark.Add(node);
if (node == null)
{
return(node);
}
// => a.ActiveDate == DateTime.Now => a.State == (byte)state
if (node.CanEvaluate())
{
return(this.VisitConstant(node.Evaluate()));
}
// => a.Nullable.Value
bool isNullable = node.Expression.Type.IsGenericType && node.Member.Name == "Value" && node.Expression.Type.GetGenericTypeDefinition() == typeof(Nullable <>);
if (isNullable)
{
return(this.Visit(node.Expression));
}
// => a.Name.Length
if (TypeUtils.IsPrimitiveType(node.Expression.Type))
{
return(_methodVisitor.VisitMemberMember(node));
}
// => <>h__3.b.ClientName
if (!node.Expression.Acceptable())
{
return(_builder.AppendMember(node, _aliases));
}
// => a.Accounts[0].Markets[0].MarketId
// => b.Client.Address.AddressName
Expression objExpression = node.Expression;
bool isMethodCall = objExpression != null && objExpression.NodeType == ExpressionType.Call;
if (isMethodCall)
{
MethodCallExpression methodExpression = objExpression as MethodCallExpression;
bool isGetItem = methodExpression.IsGetListItem();
if (isGetItem)
{
objExpression = methodExpression.Object;
}
}
// => b.Client.Address.AddressName
this.VisitNavMember(objExpression, node.Member.Name);
return(node);
}
protected override Expression VisitMember(MemberExpression node)
{
if (node.Member.DeclaringType.IsClosureClass())
{
return(Expression.Constant(node.Evaluate(), node.Type));
}
return(base.VisitMember(node));
}
private static object Evaluate(MemberExpression node)
{
var expression = node.Expression;
if (node.Member is FieldInfo field && expression.NodeType == ExpressionType.Constant)
{
return(field.GetValue(((ConstantExpression)expression).Value));
}
return(node.Evaluate());
}
protected override Expression VisitMember(MemberExpression node)
{
// 1.<>h__TransparentIdentifier3.b.Client.ClientName
// 2.<>h__TransparentIdentifier3.b.Client.ClientName.Length
// 3.<>h__TransparentIdentifier3.b.Client.Address.AddressName
// 4.<>h__TransparentIdentifier3.b.ClientName
// <>h__TransparentIdentifier2.<>h__TransparentIdentifier3.b.ClientName
// <>h__TransparentIdentifier2.<>h__TransparentIdentifier3.b.Client.ClientName
// <>h__TransparentIdentifier2.<>h__TransparentIdentifier3.b.Client.Address.AddressName
// 5.b.ClientName
if (node == null)
{
return(node);
}
// 表达式 => a.ActiveDate == DateTime.Now
if (node.Expression == null)
{
return(this.VisitConstant(node.Evaluate()));
}
// 表达式 => a.State == (byte)state
if (node.IsConstant())
{
return(this.VisitConstant(node.Evaluate()));
}
// 表达式 => a.Name.Length
if (Reflection.TypeUtils.IsPrimitive(node.Expression.Type))
{
return(_provider.MethodVisitor.VisitMemberMember(node, this));
}
// 表达式 => <>h__3.b.ClientName
if (!node.Expression.IsVisitable())
{
return(_builder.AppendMember(node, _aliases));
}
// 表达式 => b.Client.Address.AddressName
this.VisitNavigation(node.Expression, node.Member.Name);
return(node);
}
/// <summary>
/// 访问字段或者属性表达式
/// </summary>
/// <param name="node">字段或者成员表达式</param>
/// <returns></returns>
protected override Expression VisitMember(MemberExpression node)
{
// 1.<>h__TransparentIdentifier3.b.Client.ClientName
// 2.<>h__TransparentIdentifier3.b.Client.ClientName.Length
// 3.<>h__TransparentIdentifier3.b.Client.Address.AddressName
// 4.<>h__TransparentIdentifier3.b.ClientName
// <>h__TransparentIdentifier2.<>h__TransparentIdentifier3.b.ClientName
// <>h__TransparentIdentifier2.<>h__TransparentIdentifier3.b.Client.ClientName
// <>h__TransparentIdentifier2.<>h__TransparentIdentifier3.b.Client.Address.AddressName
// 5.b.ClientName
if (node == null)
{
return(node);
}
// => a.ActiveDate == DateTime.Now => a.State == (byte)state
if (node.CanEvaluate())
{
return(this.VisitConstant(node.Evaluate()));
}
// => DateTime.Now
if (node.Type == typeof(DateTime) && node.Expression == null)
{
return(this.VisitMethodCall(node, MethodCallType.MemberMember));
}
// => a.Nullable.Value
bool isNullable = node.Expression.Type.IsGenericType && node.Member.Name == "Value" && node.Expression.Type.GetGenericTypeDefinition() == typeof(Nullable <>);
if (isNullable)
{
this.Visit(node.Expression);
return(node);
}
// 记录访问成员栈
_visitedStack.Add(node);
// => a.Name.Length
if (TypeUtils.IsPrimitiveType(node.Expression.Type))
{
return(this.VisitMethodCall(node, MethodCallType.MemberMember));
}
// => <>h__3.b.ClientName
if (!node.Expression.Visitable())
{
_builder.AppendMember(_ag, node);
return(node);
}
// => a.Accounts[0].Markets[0].MarketId
// => b.Client.Address.AddressName
Expression objExpression = node.Expression;
bool isMethodCall = objExpression != null && objExpression.NodeType == ExpressionType.Call;
if (isMethodCall)
{
MethodCallExpression methodExpression = objExpression as MethodCallExpression;
bool isIndex = methodExpression.IsCollectionIndex();
if (isIndex)
{
objExpression = methodExpression.Object;
}
}
// => b.Client.Address.AddressName
this.VisitNavMember(objExpression, TypeUtils.GetFieldName(node.Member, node.Expression.Type));
return(node);
}