private static Expression GetPropertySetterExpr(Metadata.Column column, Expression resultExpr, Expression readerExpr)
{
var propertyExpression = Expression.Property(resultExpr, column.Property);
var readerGetValueByNameExpression = CreateReaderGetValueExpr(column, readerExpr);
return(Expression.Assign(propertyExpression, readerGetValueByNameExpression));
}
private static Expression CreateReaderGetValueExpr(Metadata.Column column, Expression readerExpr)
{
var propertyName = Expression.Constant(column.Name);
var ordinalCallExpr = Expression.Call(readerExpr, ReaderGetOrdinalMethod, propertyName);
var getValueExpr = Expression.Property(readerExpr, ReaderIndexByStringProperty, propertyName);
// Return the first valid expression:
// - Property is Enum,
var propertyType = column.Property.PropertyType;
return(EnumParseReaderValueExpression(column, getValueExpr)
?? ReaderGetSpecificTypeExpression(propertyType, readerExpr, ordinalCallExpr)
?? Expression.Convert(getValueExpr, propertyType));
}
private static Expression EnumParseReaderValueExpression(Metadata.Column column, Expression getValueExpr)
{
if (column.IsEnum)
{
// If DbEnumSaveType is Numeric, just cast
var propertyType = column.Property.PropertyType;
if (column.EnumSaveType == EnumSaveType.Numeric)
{
return(Expression.Convert(getValueExpr, propertyType));
}
// Otherwise, Call (EnumType)Enum.Parse(typeof(EnumType), reader[Name].ToString(), true)
return
(Expression.Convert(
Expression.Call(
EnumParseMethod,
Expression.Constant(propertyType),
Expression.Call(getValueExpr, ToStringMethod),
Expression.Constant(true)),
propertyType));
}
return(null);
}
private static MethodCallExpression ColumnToParamExpression(Expression cmdExpr, Metadata.Column column, Expression objExpr)
{
Expression valueExpr;
if (column.IsEnum && column.EnumSaveType == EnumSaveType.String)
{
valueExpr = Expression.Call(Expression.Property(objExpr, column.Property), ToStringMethod);
}
else
{
valueExpr = Expression.Property(objExpr, column.Property);
}
var parameterName = Expression.Constant("@" + column.Name);
var valueAsObject = Expression.Convert(valueExpr, typeof(object));
return(Expression.Call(SetCommandParameterValueMethod, cmdExpr, parameterName, valueAsObject));
}
