protected virtual void ExpressionParse(UnaryExpression expression)
{
if (!(expression.Operand is MemberExpression))
{
ExpressionParse(expression.Operand);
return;
}
var member = new MemberInfoEx(((MemberExpression)expression.Operand).Member);
switch (expression.NodeType)
{
case ExpressionType.Not:
Params.Add(ConstSet.True);
sb.Append(CloumnName(member.Name) + " " + ConstSet.Eq + " " + ConstSet.ParamChar);
break;
case ExpressionType.NotEqual:
Params.Add(ConstSet.False);
sb.Append(CloumnName(member.Name) + " " + ConstSet.Eq + " " + ConstSet.ParamChar);
break;
case ExpressionType.Convert:
Params.Add(member.GetValue(null));
sb.Append(ConstSet.ParamChar);
break;
default:
sb.Append(CloumnName(member.Name));
break;
}
}
protected object GetMemberExpressionValue(MemberExpression expression)
{
var member = new MemberInfoEx(expression.Member);
var exp = expression.Expression;
if (exp is ConstantExpression)
{
return(member.GetValue(((ConstantExpression)exp).Value));
}
else if (exp == null)
{
return(member.GetValue(null));
}
else if (exp is MemberExpression)
{
return(member.GetValue(GetMemberExpressionValue((MemberExpression)exp)));
}
return(null);
}