public DbExpression GetDbExpression(MemberExpression memberExpressionDeriveParameter)
{
Stack <MemberExpression> memberExpressions = ExpressionExtensions.Reverse(memberExpressionDeriveParameter);
DbExpression ret = null;
IMappingObjectExpression moe = this;
foreach (MemberExpression memberExpression in memberExpressions)
{
MemberInfo member = memberExpression.Member;
if (moe == null && ret != null)
{
/* a.F_DateTime.Value.Date */
ret = DbExpression.MemberAccess(member, ret);
continue;
}
DbExpression e = moe.GetMemberExpression(member);
if (e == null)
{
moe = moe.GetNavMemberExpression(member);
if (moe == null)
{
if (ret == null)
{
throw new Exception();
}
else
{
ret = DbExpression.MemberAccess(member, ret);
continue;
}
}
if (ret != null)
{
throw new NotSupportedException(memberExpressionDeriveParameter.ToString());
}
}
else
{
if (ret != null)
{
throw new NotSupportedException(memberExpressionDeriveParameter.ToString());
}
ret = e;
}
}
if (ret == null)
{
throw new Exception(memberExpressionDeriveParameter.ToString());
}
return(ret);
}
public IMappingObjectExpression GetNavMemberExpression(MemberExpression memberExpressionDeriveParameter)
{
Stack <MemberExpression> memberExpressions = ExpressionExtensions.Reverse(memberExpressionDeriveParameter);
if (memberExpressions.Count == 0)
{
throw new Exception();
}
IMappingObjectExpression ret = this;
foreach (MemberExpression memberExpression in memberExpressions)
{
MemberInfo member = memberExpression.Member;
ret = ret.GetNavMemberExpression(member);
if (ret == null)
{
throw new NotSupportedException(memberExpressionDeriveParameter.ToString());
}
}
return(ret);
}
public DbExpression GetDbExpression(MemberExpression memberExpressionDeriveFromParameter)
{
Stack <MemberExpression> memberExpressions = ExpressionExtension.Reverse(memberExpressionDeriveFromParameter);
DbExpression ret = null;
IMappingObjectExpression moe = this;
foreach (MemberExpression memberExpression in memberExpressions)
{
MemberInfo accessedMember = memberExpression.Member;
if (moe == null && ret != null)
{
/* a.F_DateTime.Value.Date */
ret = DbExpression.MemberAccess(accessedMember, ret);
continue;
}
/* **.accessedMember */
DbExpression e = moe.GetMemberExpression(accessedMember);
if (e == null)
{
/* Indicate current accessed member is not mapping member,then try get complex member like 'a.Order' */
moe = moe.GetNavMemberExpression(accessedMember);
if (moe == null)
{
if (ret == null)
{
/*
* If run here,the member access expression must be like 'a.xx',
* and member 'xx' is neither mapping member nor complex member,in this case,we not supported.
*/
throw new InvalidOperationException(memberExpressionDeriveFromParameter.ToString());
}
else
{
/* Non mapping member is not found also,then convert linq MemberExpression to DbMemberExpression */
ret = DbExpression.MemberAccess(accessedMember, ret);
continue;
}
}
if (ret != null)
{
/* This case and case #110 will not appear in normal,if you meet,please email me([email protected]) or call 911 for help. */
throw new InvalidOperationException(memberExpressionDeriveFromParameter.ToString());
}
}
else
{
if (ret != null)//Case: #110
{
throw new InvalidOperationException(memberExpressionDeriveFromParameter.ToString());
}
ret = e;
}
}
if (ret == null)
{
/*
* If run here,the input argument 'memberExpressionDeriveFromParameter' expression must be like 'a.xx','a.**.xx','a.**.**.xx' ...and so on,
* and the last accessed member 'xx' is not mapping member,in this case,we not supported too.
*/
throw new InvalidOperationException(memberExpressionDeriveFromParameter.ToString());
}
return(ret);
}