public static string GetMetaFieldName <T>(int tabIdx, string propertyName)
{
string fieldName = string.Empty;
var field = DbMetaDataManager.GetFieldName(typeof(T), propertyName);
if (field != null)
{
fieldName = string.Format("T{0}.{1}", tabIdx, field);
}
return(fieldName);
}
protected override Expression VisitMember(MemberExpression node)
{
var fieldName = DbMetaDataManager.GetFieldName(node.Member.DeclaringType, node.Member.Name);
string tn = string.Empty;
if (Ass.TryGetValue(node.Member.DeclaringType, out tn))
{
sb.Append(tn);
sb.Append(".");
}
sb.Append(fieldName);
return(node);
}
/// <summary>
/// 访问成员
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
protected override Expression VisitMember(MemberExpression node)
{
if (node.Expression != null && (node.Expression.NodeType == ExpressionType.Parameter || node.Expression.NodeType == ExpressionType.MemberAccess) && isleft)
{
bool isAsName = false;
var pse = node.Expression as ParameterExpression;
if (pse != null && pse.Type == node.Member.DeclaringType)
{
if (!Ass.Keys.Contains(pse.Type))
{
Ass.TryAdd(pse.Type, pse.Name);
}
isAsName = true;
}
string ts = string.Empty;
if (!isAsName && !Ass.TryGetValue(node.Member.DeclaringType, out ts))
{
GetParentMemberName(node.Expression);
}
var fieldName = DbMetaDataManager.GetFieldName(node.Member.DeclaringType, node.Member.Name);
string tn = string.Empty;
if (Ass.TryGetValue(node.Member.DeclaringType, out tn))
{
sb.Append(tn);
sb.Append(".");
}
sb.Append(fieldName);
return(node);
}
else
{
LambdaExpression lambda = Expression.Lambda(node);
var fn = lambda.Compile();
this.Visit(Expression.Constant(fn.DynamicInvoke(null), node.Type));
}
return(node);
}
protected override MemberAssignment VisitMemberAssignment(MemberAssignment node)
{
string propertyName = node.Member.Name;
string fieldName = DbMetaDataManager.GetFieldName(node.Member.DeclaringType, propertyName);
if (node.Expression.NodeType == ExpressionType.Call)
{
VisitMethodCall((MethodCallExpression)node.Expression, fieldName);
}
else if (node.Expression.NodeType == ExpressionType.Convert)
{
var ue = node.Expression as UnaryExpression;
var call = ue.Operand as MethodCallExpression;
if (call != null)
{
this.VisitMethodCall(call, fieldName);
}
else
{
this.MyVisitMember(ue.Operand as MemberExpression, fieldName);
}
}
else
{
parameters.Add(fieldName, new Parameter(ParamPrefix + fieldName, null));
var constant = node.Expression as ConstantExpression;
if (constant != null)
{
VisitConstant(constant, fieldName);
}
else
{
LambdaExpression lambda = Expression.Lambda(node.Expression);
var fn = lambda.Compile();
VisitConstant(Expression.Constant(fn.DynamicInvoke(null), node.Expression.Type), fieldName);
}
}
return(node);
}
