protected override Expression VisitMember(MemberExpression node)
{
var lastNode = nodeTypes.Peek();
var member = node.Member;
//if (node.Expression == null)
//{
// throw Error.NotSupportedException("不支持静态成员转换成Sql。Member："+ member.DeclaringType.Name+"."+member.Name);
//}
if (member.DeclaringType.IsGenericType && member.DeclaringType.GetGenericTypeDefinition() == typeof(Nullable <>))
{
if (member.Name == "Value")
{
return(Visit(node.Expression));
}
else if (member.Name == "HasValue")
{
sql += "(";
var n = Visit(node.Expression);
sql += " IS NOT NULL)";
return(n);
}
}
object value;
var hasValue = TryGetExpressionValue(node, out value);
var namedType = typeVisitor.Get(node.Expression?.Type);
if (namedType != null)
{
if (lastNode == ExpressionType.MemberAccess)
{
throw Error.NotSupportedException("不支持嵌套属性。");
}
nodeTypes.Push(node.NodeType);
if (lastNode == ExpressionType.Call && methodTypes.Any())
{
var fieldName = namedType.GetSql(member, privoder);
ConvertMethod(hasValue, value, fieldName);
}
else
{
if (hasValue)
{
sql += privoder.GetParameterIndex();
privoder.parameters.Add(value);
}
else
{
sql += namedType.GetSql(member, privoder);
if (node.Type.NonNullableType() == typeof(bool) &&
(lastNode == ExpressionType.AndAlso ||
lastNode == ExpressionType.OrElse ||
lastNode == ExpressionType.Not ||
lastNode == ExpressionType.Block))
{
sql += " = ";
sql += privoder.GetParameterIndex();
privoder.parameters.Add(true);
}
}
}
nodeTypes.Pop();
}
else if (member == typeof(string).GetProperty("Length"))
{
sql += "LEN(";
if (hasValue)
{
sql += privoder.GetParameterIndex();
privoder.parameters.Add(value);
}
else
{
base.VisitMember(node);
}
sql += ")";
}
else if (methodTypes.Any() && methodTypes.Peek() == Constans.EnumerableContains)
{
if (hasValue)
{
SetEnumerable(value as IEnumerable);
}
else
{
throw Error.NotSupportedException("不支持动态枚举的Contains方法。");
}
}
else
{
if (hasValue)
{
sql += privoder.GetParameterIndex();
privoder.parameters.Add(value);
}
else
{
throw Error.NotSupportedException("不支持的成员。");
}
}
return(node);
}
