Support deserialization for Struct properties that implements IList<T> by RaymondHuy · Pull Request #41223 · dotnet/runtime

RaymondHuy · 2020-08-23T06:16:56Z

Fixes#1998
~~Add a new field into IListOfTConverter class to store the values to prevent unboxing when the TCollection is ValueType.~~

Add a new field into IListOfTConverter class to store the values to prevent unboxing when the TCollection is ValueType.

Dotnet-GitSync-Bot · 2020-08-23T06:17:00Z

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

dnfadmin · 2020-08-23T06:17:13Z

All CLA requirements met.

…ion<T>, IList Use constraint type instead of TCollection to avoid unboxing when TCollection is ValueType.

…T>, IDictionary<TKey, TValue>, IDictionary Use constraint type to cast to avoid unboxing when the target type is ValueType

RaymondHuy · 2020-09-04T15:39:35Z

Hi @layomia @steveharter I have updated my PR to resolve your comments. Are there anything else I can do to get this PR approved ?

layomia

Thanks for the changes.

We also need to update the Add methods of the following converter types and add corresponding tests:

ICollectionOfTConverter
IDictionaryConverter
IDictionaryOfTKeyTValueConverter
IListConverter
IListOfTConverter
ISetOfTConverter

Modify the 'Add' method to use actual type casting.

RaymondHuy · 2020-09-25T17:39:41Z

@layomia I have just updated my PR.
Here is my benchmark result: The first table is before the change and the second table is after the change.

BenchmarkDotNet=v0.12.1.1405-nightly, OS=Windows 10.0.18363.1082 (1909/November2019Update/19H2)
Intel Core i7-9700 CPU 3.00GHz, 1 CPU, 8 logical and 8 physical cores
.NET Core SDK=5.0.100-preview.7.20366.6
[Host] : .NET Core 5.0.0 (CoreCLR 5.0.20.36411, CoreFX 5.0.20.36411), X64 RyuJIT
Job-WVOCPJ : .NET Core 5.0 (CoreCLR 42.42.42.42424, CoreFX 42.42.42.42424), X64 RyuJIT
PowerPlanMode=00000000-0000-0000-0000-000000000000 Arguments=/p:DebugType=portable Toolchain=CoreRun IterationTime=250.0000 ms MaxIterationCount=20 MinIterationCount=15 WarmupCount=1

ArrayList

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	49.54 μs	0.439 μs	0.389 μs	49.55 μs	48.71 μs	50.26 μs	4.8905	0.5869	-	30.29 KB
DeserializeFromUtf8Bytes	50.77 μs	0.409 μs	0.363 μs	50.74 μs	50.38 μs	51.67 μs	4.8940	0.6117	-	30.29 KB
DeserializeFromStream	48.72 μs	0.374 μs	0.350 μs	48.78 μs	48.16 μs	49.33 μs	4.8704	0.5845	-	30.36 KB

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	47.89 μs	0.524 μs	0.490 μs	47.91 μs	47.07 μs	48.71 μs	4.7701	0.5724	-	30.29 KB
DeserializeFromUtf8Bytes	48.35 μs	0.420 μs	0.372 μs	48.38 μs	47.57 μs	49.03 μs	4.7755	0.5731	-	30.29 KB
DeserializeFromStream	48.71 μs	0.375 μs	0.351 μs	48.82 μs	47.71 μs	49.08 μs	4.8132	0.5776	-	30.36 KB

BinaryData

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	631.3 ns	6.61 ns	5.86 ns	630.5 ns	623.3 ns	642.4 ns	0.1691	-	-	1.05 KB
DeserializeFromUtf8Bytes	494.2 ns	6.63 ns	6.21 ns	494.9 ns	483.8 ns	505.7 ns	0.1702	-	-	1.05 KB
DeserializeFromStream	802.9 ns	5.92 ns	5.25 ns	802.5 ns	793.5 ns	811.6 ns	0.1805	-	-	1.12 KB

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	613.5 ns	5.62 ns	4.98 ns	614.1 ns	604.5 ns	621.6 ns	0.1708	-	-	1.05 KB
DeserializeFromUtf8Bytes	474.7 ns	5.66 ns	5.30 ns	474.6 ns	465.5 ns	484.4 ns	0.1700	-	-	1.05 KB
DeserializeFromStream	797.8 ns	8.74 ns	8.18 ns	798.8 ns	785.3 ns	811.6 ns	0.1823	-	-	1.12 KB

Dictionary_string, string

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	21.51 μs	0.140 μs	0.124 μs	21.51 μs	21.32 μs	21.73 μs	4.0650	0.5081	-	25.27 KB
DeserializeFromUtf8Bytes	21.27 μs	0.082 μs	0.072 μs	21.26 μs	21.16 μs	21.41 μs	4.0671	0.4980	-	25.27 KB
DeserializeFromStream	23.27 μs	0.309 μs	0.289 μs	23.17 μs	22.88 μs	23.92 μs	4.0980	0.4657	-	25.34 KB

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	21.77 μs	0.277 μs	0.259 μs	21.71 μs	21.36 μs	22.22 μs	4.0461	0.5165	-	25.27 KB
DeserializeFromUtf8Bytes	21.25 μs	0.312 μs	0.292 μs	21.26 μs	20.83 μs	21.82 μs	4.1052	0.5027	-	25.27 KB
DeserializeFromStream	22.78 μs	0.129 μs	0.121 μs	22.78 μs	22.61 μs	23.06 μs	4.1248	0.4484	-	25.34 KB

HashSet_String

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	12.47 μs	0.109 μs	0.096 μs	12.48 μs	12.33 μs	12.64 μs	2.3944	0.1955	-	14.87 KB
DeserializeFromUtf8Bytes	12.30 μs	0.104 μs	0.093 μs	12.33 μs	12.13 μs	12.43 μs	2.4171	0.1973	-	14.87 KB
DeserializeFromStream	13.76 μs	0.171 μs	0.160 μs	13.79 μs	13.49 μs	14.02 μs	2.4246	0.1616	-	14.94 KB

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	12.80 μs	0.077 μs	0.072 μs	12.82 μs	12.67 μs	12.96 μs	2.4155	0.2013	-	14.87 KB
DeserializeFromUtf8Bytes	11.90 μs	0.113 μs	0.106 μs	11.87 μs	11.73 μs	12.12 μs	2.3819	0.1905	-	14.87 KB
DeserializeFromStream	13.69 μs	0.102 μs	0.096 μs	13.69 μs	13.52 μs	13.82 μs	2.4288	0.1619	-	14.94 KB

HashTable

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	64.86 μs	0.419 μs	0.371 μs	64.95 μs	64.28 μs	65.30 μs	7.0699	1.3092	-	44.22 KB
DeserializeFromUtf8Bytes	65.87 μs	0.531 μs	0.497 μs	65.79 μs	64.76 μs	66.66 μs	7.0112	1.2984	-	44.22 KB
DeserializeFromStream	66.66 μs	0.435 μs	0.385 μs	66.60 μs	66.08 μs	67.32 μs	7.1485	1.0590	-	44.29 KB

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	65.16 μs	0.761 μs	0.712 μs	64.97 μs	64.18 μs	66.29 μs	7.1203	1.3186	-	44.22 KB
DeserializeFromUtf8Bytes	66.34 μs	0.585 μs	0.547 μs	66.47 μs	65.38 μs	67.23 μs	7.1109	1.3168	-	44.22 KB
DeserializeFromStream	65.35 μs	0.448 μs	0.397 μs	65.37 μs	64.51 μs	66.08 μs	7.0057	1.0379	-	44.29 KB

ImmutableDictionary_String, String

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	45.44 μs	0.361 μs	0.320 μs	45.44 μs	44.74 μs	46.04 μs	5.0074	0.5564	-	31.61 KB
DeserializeFromUtf8Bytes	45.73 μs	0.368 μs	0.345 μs	45.75 μs	45.16 μs	46.27 μs	5.0725	0.7246	-	31.61 KB
DeserializeFromStream	48.37 μs	0.398 μs	0.372 μs	48.44 μs	47.82 μs	49.08 μs	5.0633	0.5842	-	31.68 KB

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	45.23 μs	0.361 μs	0.337 μs	45.16 μs	44.76 μs	45.79 μs	5.0578	0.5419	-	31.61 KB
DeserializeFromUtf8Bytes	46.00 μs	0.284 μs	0.252 μs	46.02 μs	45.44 μs	46.29 μs	5.1471	0.7353	-	31.61 KB
DeserializeFromStream	48.39 μs	0.340 μs	0.318 μs	48.36 μs	47.78 μs	48.97 μs	5.0096	0.5780	-	31.68 KB

ImmutableSortedDictionary_String, String

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	76.58 μs	0.780 μs	0.730 μs	76.50 μs	75.42 μs	77.94 μs	6.0680	0.6068	-	38.29 KB
DeserializeFromUtf8Bytes	72.56 μs	0.859 μs	0.804 μs	72.54 μs	71.49 μs	74.19 μs	6.0484	0.8641	-	38.29 KB
DeserializeFromStream	74.30 μs	0.514 μs	0.481 μs	74.07 μs	73.67 μs	75.19 μs	5.9701	0.5970	-	38.36 KB

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	72.86 μs	0.692 μs	0.647 μs	73.13 μs	71.68 μs	73.74 μs	6.0484	0.8641	-	38.29 KB
DeserializeFromUtf8Bytes	74.66 μs	0.408 μs	0.361 μs	74.69 μs	73.89 μs	75.17 μs	6.0386	0.6039	-	38.29 KB
DeserializeFromStream	73.85 μs	0.336 μs	0.297 μs	73.86 μs	73.37 μs	74.60 μs	5.9719	0.5972	-	38.36 KB

IndexViewModel

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	28.99 μs	0.241 μs	0.213 μs	28.97 μs	28.60 μs	29.40 μs	3.5789	0.3463	-	22.01 KB
DeserializeFromUtf8Bytes	28.33 μs	0.226 μs	0.200 μs	28.32 μs	28.02 μs	28.76 μs	3.4882	0.3376	-	22.01 KB
DeserializeFromStream	31.05 μs	0.374 μs	0.350 μs	31.01 μs	30.55 μs	31.62 μs	3.4969	0.3747	-	22.08 KB

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	29.42 μs	0.273 μs	0.242 μs	29.42 μs	29.00 μs	29.86 μs	3.5469	0.3547	-	22.01 KB
DeserializeFromUtf8Bytes	28.02 μs	0.172 μs	0.144 μs	28.02 μs	27.74 μs	28.24 μs	3.5147	0.3401	-	22.01 KB
DeserializeFromStream	30.78 μs	0.261 μs	0.244 μs	30.70 μs	30.42 μs	31.18 μs	3.5526	0.3675	-	22.08 KB

Int32

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	133.65 ns	0.635 ns	0.594 ns	133.60 ns	132.38 ns	134.46 ns	-	-	-	-
DeserializeFromUtf8Bytes	81.61 ns	0.301 ns	0.281 ns	81.59 ns	81.09 ns	81.96 ns	-	-	-	-
DeserializeFromStream	262.62 ns	2.082 ns	1.948 ns	262.14 ns	259.80 ns	266.31 ns	0.0107	-	-	72 B

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	136.19 ns	0.877 ns	0.821 ns	136.16 ns	134.82 ns	137.77 ns	-	-	-	-
DeserializeFromUtf8Bytes	81.36 ns	0.343 ns	0.321 ns	81.29 ns	80.65 ns	82.00 ns	-	-	-	-
DeserializeFromStream	253.83 ns	2.359 ns	2.207 ns	253.43 ns	250.68 ns	257.52 ns	0.0113	-	-	72 B

LargeStructWithProperties

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	1.142 μs	0.0103 μs	0.0091 μs	1.140 μs	1.127 μs	1.160 μs	0.0279	-	-	200 B
DeserializeFromUtf8Bytes	1.069 μs	0.0063 μs	0.0059 μs	1.069 μs	1.059 μs	1.081 μs	0.0298	-	-	200 B
DeserializeFromStream	1.596 μs	0.0142 μs	0.0132 μs	1.590 μs	1.581 μs	1.620 μs	0.0499	-	-	328 B

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	1.157 μs	0.0076 μs	0.0071 μs	1.158 μs	1.147 μs	1.172 μs	0.0276	-	-	200 B
DeserializeFromUtf8Bytes	1.081 μs	0.0065 μs	0.0058 μs	1.081 μs	1.071 μs	1.088 μs	0.0302	-	-	200 B
DeserializeFromStream	1.498 μs	0.0094 μs	0.0088 μs	1.498 μs	1.483 μs	1.516 μs	0.0475	-	-	328 B

Location

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	1.259 μs	0.0092 μs	0.0086 μs	1.260 μs	1.246 μs	1.277 μs	0.0698	-	-	448 B
DeserializeFromUtf8Bytes	1.153 μs	0.0112 μs	0.0105 μs	1.155 μs	1.135 μs	1.171 μs	0.0689	-	-	448 B
DeserializeFromStream	1.550 μs	0.0104 μs	0.0098 μs	1.548 μs	1.534 μs	1.568 μs	0.0815	-	-	520 B

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	1.240 μs	0.0085 μs	0.0079 μs	1.240 μs	1.221 μs	1.253 μs	0.0695	-	-	448 B
DeserializeFromUtf8Bytes	1.130 μs	0.0112 μs	0.0105 μs	1.133 μs	1.109 μs	1.143 μs	0.0682	-	-	448 B
DeserializeFromStream	1.534 μs	0.0163 μs	0.0153 μs	1.538 μs	1.512 μs	1.563 μs	0.0797	-	-	520 B

LoginViewModel

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	468.6 ns	3.98 ns	3.72 ns	469.0 ns	464.0 ns	475.4 ns	0.0261	-	-	168 B
DeserializeFromUtf8Bytes	444.6 ns	4.95 ns	4.63 ns	442.9 ns	439.1 ns	455.1 ns	0.0255	-	-	168 B
DeserializeFromStream	727.3 ns	5.57 ns	5.21 ns	727.9 ns	719.8 ns	735.3 ns	0.0375	-	-	240 B

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	464.8 ns	1.69 ns	1.58 ns	464.9 ns	462.0 ns	467.4 ns	0.0257	-	-	168 B
DeserializeFromUtf8Bytes	451.0 ns	3.38 ns	3.16 ns	451.4 ns	443.2 ns	454.8 ns	0.0266	-	-	168 B
DeserializeFromStream	702.5 ns	4.70 ns	4.17 ns	701.3 ns	696.4 ns	710.7 ns	0.0364	-	-	240 B

MyEventListerViewModel

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	324.4 μs	2.10 μs	1.97 μs	324.2 μs	320.7 μs	328.0 μs	11.6129	2.5806	-	76.9 KB
DeserializeFromUtf8Bytes	304.2 μs	1.40 μs	1.24 μs	304.2 μs	302.5 μs	306.6 μs	12.1359	3.6408	-	76.9 KB
DeserializeFromStream	363.7 μs	1.48 μs	1.24 μs	363.6 μs	361.9 μs	366.4 μs	11.5774	2.8944	-	77.74 KB

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	330.9 μs	2.66 μs	2.49 μs	331.2 μs	326.4 μs	335.2 μs	11.8577	2.6350	-	76.9 KB
DeserializeFromUtf8Bytes	306.6 μs	2.11 μs	1.76 μs	307.1 μs	302.6 μs	308.5 μs	11.6732	2.5940	-	76.9 KB
DeserializeFromStream	361.3 μs	3.36 μs	3.14 μs	360.7 μs	356.7 μs	366.3 μs	11.5607	2.8902	-	77.75 KB

SimpleStructWithProperties

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	331.8 ns	2.86 ns	2.68 ns	332.3 ns	326.0 ns	335.3 ns	0.0092	-	-	64 B
DeserializeFromUtf8Bytes	275.7 ns	1.93 ns	1.61 ns	276.2 ns	273.1 ns	278.4 ns	0.0091	-	-	64 B
DeserializeFromStream	531.0 ns	4.21 ns	3.94 ns	531.4 ns	524.9 ns	538.0 ns	0.0212	-	-	144 B

Method	Mean	Error	StdDev	Median	Min	Max	Gen 0	Gen 1	Gen 2	Allocated
DeserializeFromString	332.5 ns	2.25 ns	1.88 ns	332.3 ns	329.2 ns	335.4 ns	0.0095	-	-	64 B
DeserializeFromUtf8Bytes	299.5 ns	1.80 ns	1.68 ns	299.1 ns	297.1 ns	302.1 ns	0.0097	-	-	64 B
DeserializeFromStream	517.6 ns	5.21 ns	4.87 ns	516.2 ns	510.3 ns	528.9 ns	0.0226	-	-	144 B

layomia

Thanks for sharing the benchmarks. The change is close to ready, I just have a few comments on the tests.

layomia · 2020-09-25T19:45:03Z

+ }
+
+ {
+ GenericStructIDictionaryWrapper<string, string>? obj = JsonSerializer.Deserialize<GenericStructIDictionaryWrapper<string, string>?>("null");


What happens when serializing a default instance of GenericStructIDictionaryWrapper<string, string>? Test this for GenericStructIListWrapper<int> as well.

- Serializing a default instance. - Deserializing a null json string.

RaymondHuy · 2020-09-27T11:47:51Z

@layomia Thanks for your comments. I've updated my PR, can you check if it is satisfied ?

layomia

LGTM, thanks!

Support deserialization for Struct properties that implements IList<T>
ba01b03
Add a new field into IListOfTConverter class to store the values to prevent unboxing when the TCollection is ValueType.

RaymondHuy requested review from jozkee, layomia and steveharter as code owners August 23, 2020 06:16

jkotas added the area-System.Text.Json label Aug 24, 2020

layomia reviewed Aug 24, 2020
View reviewed changes

Comment thread...stem.Text.Json/src/System/Text/Json/Serialization/Converters/Collection/IListOfTConverter.cs Outdated

layomia added this to the 6.0.0 milestone Aug 24, 2020

steveharter reviewed Aug 24, 2020
View reviewed changes

Comment thread...stem.Text.Json/src/System/Text/Json/Serialization/Converters/Collection/IListOfTConverter.cs Outdated

HuyLuong added 2 commits August 26, 2020 23:24

Support deserialization for struct that implements IList<T>, ICollect…
30bc9d7
…ion<T>, IList Use constraint type instead of TCollection to avoid unboxing when TCollection is ValueType.

Add testcase Support deserialization for Struct that implements ISet<…
0b8260c
…T>, IDictionary<TKey, TValue>, IDictionary Use constraint type to cast to avoid unboxing when the target type is ValueType

jaredpar mentioned this pull request Aug 27, 2020
Errors installing the SDK during builds #34015
Closed

RaymondHuy requested review from layomia and steveharter September 3, 2020 16:23

RaymondHuy closed this Sep 5, 2020

RaymondHuy reopened this Sep 5, 2020

layomia reviewed Sep 14, 2020
View reviewed changes

Comment thread...ystem.Text.Json/src/System/Text/Json/Serialization/Converters/Collection/ISetOfTConverter.cs Outdated
Comment thread...braries/System.Text.Json/tests/Serialization/CollectionTests/CollectionTests.Generic.Read.cs

Add testcase for reading nullable struct and null json.
0eb3a88
Modify the 'Add' method to use actual type casting.

layomia reviewed Sep 25, 2020
View reviewed changes

Add test cases for struct collection:
d935b04
- Serializing a default instance. - Deserializing a null json string.

layomia approved these changes Sep 27, 2020
View reviewed changes

layomia merged commit 08472ef into dotnet:masterSep 27, 2020

ghost locked as resolved and limited conversation to collaborators Dec 7, 2020

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Support deserialization for Struct properties that implements IList<T> - #41223

Support deserialization for Struct properties that implements IList<T>#41223
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