private static string VisitCore(BinaryExpression bin, IOperatorResolverList lst)
{
if (bin.Left.NodeType == ExpressionType.Constant && ((ConstantExpression)bin.Left).Value == null ||
bin.Right.NodeType == ExpressionType.Constant && ((ConstantExpression)bin.Right).Value == null)
{
var openParen = "(";
if (bin.NodeType == ExpressionType.NotEqual)
{
openParen = "(NOT ";
}
if (bin.Right.NodeType == ExpressionType.Constant)
{
return(openParen + Visit(bin.Left, lst) + " IS NULL) ");
}
return(openParen + Visit(bin.Right, lst) + " IS NULL) ");
}
var lvalue = Visit(bin.Left, lst);
var op = lst.GetOperatorFor(bin.NodeType);
var rvalue = Visit(bin.Right, lst);
if (rvalue.Trim() == "NULL" && op.Trim() == "=")
{
op = " IS ";
}
return("(" + lvalue + op + rvalue + ")");
}
public static string VisitCore(UnaryExpression expr, IOperatorResolverList lst)
{
if (expr.NodeType == ExpressionType.Convert)
{
var mem = (MemberExpression)expr.Operand;
return(mem.GetValue().FormatValue());
}
if (expr.NodeType == ExpressionType.Not)
{
if (expr.Operand.NodeType == ExpressionType.Call)
{
var meth = (MethodCallExpression)expr.Operand;
return(meth.ParseContainsCall(" NOT"));
}
return("");
}
return("");
}
public static string VisitCore(MemberExpression memberExp, IOperatorResolverList lst)
{
if (memberExp.Expression != null
&&
(memberExp.Expression.NodeType == ExpressionType.Constant ||
memberExp.Expression.NodeType == ExpressionType.MemberAccess)
)
{
return(string.Format(" {0} ", memberExp.GetValue().FormatValue()));
}
if (
memberExp.Expression != null &&
memberExp.Expression.NodeType == ExpressionType.Parameter)
{
return(string.Format(" {0} ", memberExp.GetAttribute()));
}
if (memberExp.Expression == null)
{
return(string.Format(" {0} ", get_value(memberExp)));
}
return("");
}
private static string VisitCore(MethodCallExpression method, IOperatorResolverList lst)
{
if (method.Method.Name == "IsNullOrEmpty")
{
return(" IS NULL ");
}
if (method.Method.Name == "Trim")
{
var argMember = (MemberExpression)method.Arguments[0];
var parm = argMember.GetAttribute();
return(string.Format(" IsNull({0}, '') = '' ", parm));
}
if (method.Method.Name == "Contains")
{
return(method.ParseContainsCall(""));
}
if (method.Method.Name == "Trim")
{
return(method.ParseTrimCall());
}
return("");
}
public static string VisitCore(ConstantExpression constant, IOperatorResolverList lst)
{
return(string.Format(" {0} ", constant.Value.FormatValue()));
}
private static string Visit(Expression expression, IOperatorResolverList lst)
{
dynamic dynamicExpression = expression;
return(VisitCore(dynamicExpression, lst));
}
