private static bool IsNullableValue(SqlMember m)
{
return(TypeSystem.IsNullableType(m.Expression.ClrType) && (m.Member.Name == "Value"));
}
private static bool CanDbConvert(Type from, Type to)
{
from = TypeSystem.GetNonNullableType(from);
to = TypeSystem.GetNonNullableType(to);
if (from == to)
{
return(true);
}
if (to.IsAssignableFrom(from))
{
return(true);
}
TypeCode typeCode = Type.GetTypeCode(to);
TypeCode code2 = Type.GetTypeCode(from);
switch (typeCode)
{
case TypeCode.Int16:
return((code2 == TypeCode.Byte) || (code2 == TypeCode.SByte));
case TypeCode.UInt16:
return((code2 == TypeCode.Byte) || (code2 == TypeCode.SByte));
case TypeCode.Int32:
switch (code2)
{
case TypeCode.Byte:
case TypeCode.SByte:
case TypeCode.Int16:
return(true);
}
return(code2 == TypeCode.UInt16);
case TypeCode.UInt32:
switch (code2)
{
case TypeCode.Byte:
case TypeCode.SByte:
case TypeCode.Int16:
return(true);
}
return(code2 == TypeCode.UInt16);
case TypeCode.Int64:
switch (code2)
{
case TypeCode.Byte:
case TypeCode.SByte:
case TypeCode.Int16:
case TypeCode.UInt16:
case TypeCode.Int32:
return(true);
}
return(code2 == TypeCode.UInt32);
case TypeCode.UInt64:
switch (code2)
{
case TypeCode.Byte:
case TypeCode.SByte:
case TypeCode.Int16:
case TypeCode.UInt16:
case TypeCode.Int32:
return(true);
}
return(code2 == TypeCode.UInt32);
case TypeCode.Double:
return(code2 == TypeCode.Single);
case TypeCode.Decimal:
if (code2 != TypeCode.Single)
{
return(code2 == TypeCode.Double);
}
return(true);
}
return(false);
}
public override Expression VisitMemberAccess(MemberExpression m)
{
if (MetaPosition.AreSameMember(m.Member, this.association.ThisMember.Member))
{
Expression[] keyValues = GetKeyValues(this.Visit(m.Expression), this.association.ThisKey);
return(Translator.WhereClauseFromSourceAndKeys(this.otherSouce, this.association.OtherKey.ToArray <MetaDataMember>(), keyValues));
}
Expression expression = this.Visit(m.Expression);
if (expression == m.Expression)
{
return(m);
}
if (((expression.Type != m.Expression.Type) && (m.Member.Name == "Count")) && TypeSystem.IsSequenceType(expression.Type))
{
return(Expression.Call(typeof(Enumerable), "Count", new Type[] { TypeSystem.GetElementType(expression.Type) }, new Expression[] { expression }));
}
return(Expression.MakeMemberAccess(expression, m.Member));
}
