SelectMany - from Assignment

Query

public void Linq17()
{
    List customers = GetCustomerList();
  
    var orders =
        from c in customers
        from o in c.Orders
        where o.Total >= 2000.0M
        select new { c.CustomerID, o.OrderID, o.Total };
  
    ObjectDumper.Write(orders);
}

Lambda Expression

public void DataSetLinq17()
{
    var customers = testDS.Tables["Customers"].AsEnumerable();
    var orders = testDS.Tables["Orders"].AsEnumerable();
 
    var myOrders =
        customers.SelectMany(c => orders, (c, o) => new {c, o})
            .Select(@t => new {@t, total = @t.o.Field("Total")})
            .Where(@t => @t.@t.c.Field("CustomerID") == @t.@t.o.Field("CustomerID") && @t.total >= 2000.0M)
            .Select(@t =>
                new {
                    CustomerID = @t.@t.c.Field("CustomerID"),
                    OrderID = @t.@t.o.Field("OrderID"), @t.total
                });
 
    ObjectDumper.Write(myOrders);
}

Output

CustomerID=ANTON OrderID=10573 Total=2082.00
CustomerID=AROUT OrderID=10558 Total=2142.90
CustomerID=AROUT OrderID=10953 Total=4441.25
CustomerID=BERGS OrderID=10384 Total=2222.40
CustomerID=BERGS OrderID=10524 Total=3192.65
CustomerID=BERGS OrderID=10672 Total=3815.25
CustomerID=BERGS OrderID=10857 Total=2048.21
CustomerID=BLONP OrderID=10360 Total=7390.20
CustomerID=BOLID OrderID=10801 Total=3026.85
CustomerID=BONAP OrderID=10340 Total=2436.18
CustomerID=BONAP OrderID=10511 Total=2550.00
CustomerID=BOTTM OrderID=10742 Total=3118.00
CustomerID=BOTTM OrderID=10949 Total=4422.00
CustomerID=CHOPS OrderID=10519 Total=2314.20
CustomerID=CHOPS OrderID=10746 Total=2311.70
CustomerID=COMMI OrderID=10290 Total=2169.00
CustomerID=EASTC OrderID=10400 Total=3063.00
CustomerID=EASTC OrderID=10987 Total=2772.00
CustomerID=EASTC OrderID=11056 Total=3740.00
CustomerID=ERNSH OrderID=10351 Total=5398.72
CustomerID=ERNSH OrderID=10382 Total=2900.00
CustomerID=ERNSH OrderID=10390 Total=2090.88
CustomerID=ERNSH OrderID=10402 Total=2713.50
CustomerID=ERNSH OrderID=10430 Total=4899.20
CustomerID=ERNSH OrderID=10514 Total=8623.45
CustomerID=ERNSH OrderID=10595 Total=4725.00
CustomerID=ERNSH OrderID=10633 Total=5510.59
CustomerID=ERNSH OrderID=10698 Total=3436.44
CustomerID=ERNSH OrderID=10764 Total=2286.00
CustomerID=ERNSH OrderID=10773 Total=2030.40
CustomerID=ERNSH OrderID=10776 Total=6635.28
CustomerID=ERNSH OrderID=10795 Total=2158.00
CustomerID=ERNSH OrderID=10836 Total=4705.50
CustomerID=ERNSH OrderID=10854 Total=2966.50
CustomerID=ERNSH OrderID=10895 Total=6379.40
CustomerID=ERNSH OrderID=10979 Total=4813.50
CustomerID=ERNSH OrderID=10990 Total=4288.85
CustomerID=ERNSH OrderID=11008 Total=4680.90
CustomerID=ERNSH OrderID=11017 Total=6750.00
CustomerID=ERNSH OrderID=11072 Total=5218.00
CustomerID=FOLIG OrderID=10634 Total=4985.50
CustomerID=FOLIG OrderID=10789 Total=3687.00
CustomerID=FOLKO OrderID=10533 Total=2222.20
CustomerID=FOLKO OrderID=10561 Total=2844.50
CustomerID=FOLKO OrderID=10703 Total=2545.00
CustomerID=FOLKO OrderID=10762 Total=4337.00
CustomerID=FOLKO OrderID=10977 Total=2233.00
CustomerID=FOLKO OrderID=10993 Total=4895.44
CustomerID=FOLKO OrderID=11001 Total=2769.00
CustomerID=FRANK OrderID=10267 Total=3536.60
CustomerID=FRANK OrderID=10337 Total=2467.00
CustomerID=FRANK OrderID=10670 Total=2301.75
CustomerID=FRANK OrderID=11012 Total=2825.30
CustomerID=GODOS OrderID=10629 Total=2775.05
CustomerID=GODOS OrderID=10872 Total=2058.46
CustomerID=GODOS OrderID=10948 Total=2362.25
CustomerID=GOURL OrderID=10709 Total=3424.00
CustomerID=GREAL OrderID=10616 Total=4807.00
CustomerID=GREAL OrderID=10816 Total=8446.45
CustomerID=HANAR OrderID=10886 Total=3127.50
CustomerID=HANAR OrderID=10981 Total=15810.00
CustomerID=HILAA OrderID=10395 Total=2122.92
CustomerID=HILAA OrderID=10490 Total=3163.20
CustomerID=HILAA OrderID=10601 Total=2285.00
CustomerID=HILAA OrderID=10641 Total=2054.00
CustomerID=HILAA OrderID=10796 Total=2341.36
CustomerID=HUNGO OrderID=10298 Total=2645.00
CustomerID=HUNGO OrderID=10335 Total=2036.16
CustomerID=HUNGO OrderID=10503 Total=2048.50
CustomerID=HUNGO OrderID=10516 Total=2381.05
CustomerID=HUNGO OrderID=10567 Total=2519.00
CustomerID=HUNGO OrderID=10687 Total=4960.90
CustomerID=HUNGO OrderID=10701 Total=2864.50
CustomerID=HUNGO OrderID=10897 Total=10835.24
CustomerID=HUNGO OrderID=10912 Total=6200.55
CustomerID=HUNGO OrderID=10985 Total=2023.38
CustomerID=KOENE OrderID=10718 Total=3463.00
CustomerID=KOENE OrderID=10817 Total=10952.84
CustomerID=KOENE OrderID=10893 Total=5502.11
CustomerID=KOENE OrderID=11028 Total=2160.00
CustomerID=LAMAI OrderID=10413 Total=2123.20
CustomerID=LAMAI OrderID=10787 Total=2622.76
CustomerID=LEHMS OrderID=10522 Total=2318.24
CustomerID=LEHMS OrderID=10772 Total=3603.22
CustomerID=LILAS OrderID=10823 Total=2826.00
CustomerID=LINOD OrderID=10638 Total=2720.05
CustomerID=LINOD OrderID=11039 Total=3090.00
CustomerID=MAISD OrderID=10760 Total=2917.00
CustomerID=MAISD OrderID=10892 Total=2090.00
CustomerID=MEREP OrderID=10339 Total=3354.00
CustomerID=MEREP OrderID=10424 Total=9194.56
CustomerID=MEREP OrderID=10570 Total=2465.25
CustomerID=MEREP OrderID=10605 Total=4109.70
CustomerID=MEREP OrderID=10618 Total=2697.50
CustomerID=MORGK OrderID=10575 Total=2147.40
CustomerID=OCEAN OrderID=10986 Total=2220.00
CustomerID=OLDWO OrderID=10305 Total=3741.30
CustomerID=OLDWO OrderID=10855 Total=2227.89
CustomerID=OTTIK OrderID=10766 Total=2310.00
CustomerID=PICCO OrderID=10353 Total=8593.28
CustomerID=PICCO OrderID=10530 Total=4180.00
CustomerID=PICCO OrderID=11053 Total=3055.00
CustomerID=PRINI OrderID=11007 Total=2633.90
CustomerID=QUEEN OrderID=10372 Total=9210.90
CustomerID=QUEEN OrderID=10637 Total=2761.94
CustomerID=QUEEN OrderID=11068 Total=2027.08
CustomerID=QUICK OrderID=10273 Total=2037.28
CustomerID=QUICK OrderID=10286 Total=3016.00
CustomerID=QUICK OrderID=10345 Total=2924.80
CustomerID=QUICK OrderID=10361 Total=2046.24
CustomerID=QUICK OrderID=10451 Total=3849.66
CustomerID=QUICK OrderID=10515 Total=9921.30
CustomerID=QUICK OrderID=10540 Total=10191.70
CustomerID=QUICK OrderID=10549 Total=3554.28
CustomerID=QUICK OrderID=10588 Total=3120.00
CustomerID=QUICK OrderID=10658 Total=4464.60
CustomerID=QUICK OrderID=10691 Total=10164.80
CustomerID=QUICK OrderID=10694 Total=4825.00
CustomerID=QUICK OrderID=10745 Total=4529.80
CustomerID=QUICK OrderID=10845 Total=3812.70
CustomerID=QUICK OrderID=10865 Total=16387.50
CustomerID=QUICK OrderID=10938 Total=2731.88
CustomerID=QUICK OrderID=10962 Total=3584.00
CustomerID=QUICK OrderID=10991 Total=2296.00
CustomerID=QUICK OrderID=11021 Total=6306.24
CustomerID=RATTC OrderID=10314 Total=2094.30
CustomerID=RATTC OrderID=10316 Total=2835.00
CustomerID=RATTC OrderID=10401 Total=3868.60
CustomerID=RATTC OrderID=10479 Total=10495.60
CustomerID=RATTC OrderID=10598 Total=2388.50
CustomerID=RATTC OrderID=10852 Total=2984.00
CustomerID=RATTC OrderID=10889 Total=11380.00
CustomerID=RATTC OrderID=10988 Total=3574.80
CustomerID=RICAR OrderID=10851 Total=2603.00
CustomerID=RICSU OrderID=10255 Total=2490.50
CustomerID=RICSU OrderID=10419 Total=2097.60
CustomerID=RICSU OrderID=10666 Total=4666.94
CustomerID=RICSU OrderID=11033 Total=3232.80
CustomerID=SANTG OrderID=10831 Total=2684.40
CustomerID=SAVEA OrderID=10324 Total=5275.72
CustomerID=SAVEA OrderID=10393 Total=2556.95
CustomerID=SAVEA OrderID=10398 Total=2505.60
CustomerID=SAVEA OrderID=10440 Total=4924.14
CustomerID=SAVEA OrderID=10452 Total=2018.50
CustomerID=SAVEA OrderID=10510 Total=4707.54
CustomerID=SAVEA OrderID=10555 Total=2944.40
CustomerID=SAVEA OrderID=10607 Total=6475.40
CustomerID=SAVEA OrderID=10612 Total=6375.00
CustomerID=SAVEA OrderID=10657 Total=4371.60
CustomerID=SAVEA OrderID=10678 Total=5256.50
CustomerID=SAVEA OrderID=10711 Total=4451.70
CustomerID=SAVEA OrderID=10713 Total=2827.90
CustomerID=SAVEA OrderID=10714 Total=2205.75
CustomerID=SAVEA OrderID=10748 Total=2196.00
CustomerID=SAVEA OrderID=10757 Total=3082.00
CustomerID=SAVEA OrderID=10847 Total=4931.92
CustomerID=SAVEA OrderID=10894 Total=2753.10
CustomerID=SAVEA OrderID=10941 Total=4011.75
CustomerID=SAVEA OrderID=11030 Total=12615.05
CustomerID=SAVEA OrderID=11031 Total=2393.50
CustomerID=SAVEA OrderID=11064 Total=4330.40
CustomerID=SEVES OrderID=10359 Total=3471.68
CustomerID=SEVES OrderID=10523 Total=2444.31
CustomerID=SEVES OrderID=10804 Total=2278.40
CustomerID=SIMOB OrderID=10417 Total=11188.40
CustomerID=SIMOB OrderID=10802 Total=2942.81
CustomerID=SPECD OrderID=10964 Total=2052.50
CustomerID=SPLIR OrderID=10329 Total=4578.43
CustomerID=SPLIR OrderID=10369 Total=2390.40
CustomerID=SUPRD OrderID=10252 Total=3597.90
CustomerID=SUPRD OrderID=10302 Total=2708.80
CustomerID=SUPRD OrderID=10458 Total=3891.00
CustomerID=SUPRD OrderID=10841 Total=4581.00
CustomerID=SUPRD OrderID=10930 Total=2255.50
CustomerID=THEBI OrderID=10805 Total=2775.00
CustomerID=TORTU OrderID=10518 Total=4150.05
CustomerID=VAFFE OrderID=10465 Total=2518.00
CustomerID=VAFFE OrderID=10688 Total=3160.60
CustomerID=VICTE OrderID=10546 Total=2812.00
CustomerID=WARTH OrderID=10455 Total=2684.00
CustomerID=WARTH OrderID=10583 Total=2237.50
CustomerID=WHITC OrderID=10344 Total=2296.00
CustomerID=WHITC OrderID=10693 Total=2071.20
CustomerID=WHITC OrderID=10861 Total=3523.40
CustomerID=WHITC OrderID=11032 Total=8902.50