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 | ||
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||
 | ||
[](https://www.nuget.org/packages/JsonEasyNavigation) | ||
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# JsonEasyNavigation | ||
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This library provides a wrapper class around Microsoft's .NET JsonElement JsonElement (located in System.Text.Json) which allows to navigate through JSON DOM (domain object model) hierarchy using indexer-style syntax (as in collections and dictionaries) for properties and array alike. It also contains useful methods to get values without throwing exceptions. | ||
Target frameworks are .NET 5 and NET Standard 2.0. | ||
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Here is an example: | ||
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```JSON | ||
{ | ||
"Persons": [ | ||
{ | ||
"Id": 0, | ||
"Name": "John", | ||
"SecondName": "Wick", | ||
"NickName": "Baba Yaga" | ||
}, | ||
{ | ||
"Id": 1, | ||
"Name": "Wade", | ||
"SecondName": "Winston", | ||
"NickName": "Deadpool" | ||
} | ||
] | ||
} | ||
``` | ||
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Assume that we are using `System.Text.Json` so we can create JsonDocument: | ||
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```C# | ||
var jsonDocument = JsonDocument.Parse(json); | ||
``` | ||
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Then we convert this JSON document to the `JsonNavigationElement` provided by JsonEasyNavigation library: | ||
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```C# | ||
var nav = jsonDocument.ToNavigation(); | ||
``` | ||
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`JsonNavigationElement` is a struct, a wrapper around JsonElement. This struct provides many useful methods to operate arrays, objects and getting values from the JsonElement inside. | ||
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Now we can easley navigate Domain Object Model using indexers in a sequential style: | ||
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```C# | ||
var arrayItem = nav[0]; // first item in the array | ||
var id = arrayItem["Id"].GetInt32OrDefault(); // 0 | ||
var nickName = arrayItem["NickName"].GetStringOrDefault(); // "Baba Yaga" | ||
``` | ||
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||
Notice the usage of `GetXxxOrDefault` methods, which provides a convenient way to get values from the JsonElement without throwing exceptions. There are a lot of other similar useful methods. | ||
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We also can check if the property exist: | ||
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```C# | ||
if (nav[0]["Age"].Exist) | ||
{ | ||
// Do something if the Age property of the first object in array exist. | ||
} | ||
``` | ||
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`JsonNavigationElement` does **not** throw exception if a property or array item does not exist. You can always check `Exist` property of an `JsonNavigationElement` to be sure that corresponding `JsonElement` was found. | ||
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It is also possible to map `JsonNavigationElement` into the object of the specific type (using JsonSerializer internally): | ||
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```C# | ||
public class Person | ||
{ | ||
public int Id { get; set; } | ||
public string Name { get; set; } | ||
public string SecondName { get; set; } | ||
public string NickName { get; set; } | ||
} | ||
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// ... | ||
var person = nav[0].Map<Person>(); | ||
``` | ||
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## Installation | ||
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You can search nuget.org for `JsonEasyNavigation` package or download it directly from <https://www.nuget.org/packages/JsonEasyNavigation/>. See this link for more information. | ||
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## Features | ||
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Overall, the library provides following features: | ||
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* A wrapper around JsonElement encapsulating all behaviour regarding to the DOM traversal and navigation (`JsonNavigationElement`); | ||
* The API is implemented in a no-throw manner - you can "get" properties that don't exist in the DOM and check their existence; | ||
* Implementation of a `IReadOnlyDictionary` and `IReadOnlyCollection`; | ||
* Methods for converting values to the specified types in a type-safe way (and also generic methods like `TryGetValue<T>`); | ||
* Extensions for caching properties and persisting their order for faster and easier JSON navigation. | ||
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## Contributing | ||
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If you would like to fix some bugs and add new features (in a non-breaking manner) you are free to send pull-requests. | ||
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## License | ||
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This software is distributed under the Apache License 2.0. See LICENSE.txt. | ||
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||
# JsonEasyNavigation | ||
This library provides a wrapper class around JsonElement (located in System.Text.Json) which allows to navigate through JSON DOM (domain object model) hierarchy using indexer-style syntax (as in collections and dictionaries) for properties and array alike. It also contains useful methods to get values without throwing exceptions. | ||
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--- | ||
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<table> | ||
<tr> | ||
<th></th> | ||
<th>Description</th> | ||
</tr> | ||
<tr> | ||
<td>UPDATED:</td> | ||
<td>9/17/2024</td> | ||
</tr> | ||
<tr> | ||
<td>FRAMEWORK:</td> | ||
<td>netstandard2.0, netstandard2.1, net9.0</td> | ||
</tr> | ||
<tr> | ||
<td>LANGUAGE:</td> | ||
<td>[C#] preview</td> | ||
</tr> | ||
<tr> | ||
<td>OUTPUT TYPE:</td> | ||
<td>Library [API]</td> | ||
</tr> | ||
<tr> | ||
<td>SUPPORTS:</td> | ||
<td>[Visual Studio]</td> | ||
</tr> | ||
<tr> | ||
<td>GFX SUBSYS:</td> | ||
<td>[None]</td> | ||
</tr> | ||
<tr> | ||
<td>TAGS:</td> | ||
<td>[text.json json navigation indexer dictionary list collection DOM]</td> | ||
</tr> | ||
<tr> | ||
<td>STATUS:</td> | ||
<td><a href="https://github.com/Latency/JsonEasyNavigation/actions/workflows/dotnet.yml"><img src="https://github.com/Latency/JsonEasyNavigation/actions/workflows/dotnet.yml/badge.svg"></a></td> | ||
</tr> | ||
<tr> | ||
<td>LICENSE:</td> | ||
<td><a href="https://github.com/Latency/JsonEasyNavigation/blob/master/MIT-LICENSE.txt"><img src="https://img.shields.io/github/license/Latency/JsonEasyNavigation?style=plastic&logo=GitHub&logoColor=black&label=License&color=yellowgreen"></a></td> | ||
</tr> | ||
<tr> | ||
<td>VERSION:</td> | ||
<td><a href="https://github.com/Latency/JsonEasyNavigation/releases"><img src="https://img.shields.io/github/v/release/Latency/JsonEasyNavigation?include_prereleases&style=plastic&logo=GitHub&logoColor=black&label=Version&color=blue"></a></td> | ||
</tr> | ||
<!-- VERSION: 1.3.2 --> | ||
</table> | ||
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||
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 | ||
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<hr> | ||
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## Navigation | ||
* <a href="#introduction">Introduction</a> | ||
* <a href="#usage">Usage</a> | ||
* <a href="#features">Features</a> | ||
* <a href="#installation">Installation</a> | ||
* <a href="#license">License</a> | ||
|
||
<hr> | ||
|
||
<h2><a name="introduction">Introduction</a></h2> | ||
|
||
This library provides a wrapper class around Microsoft's .NET JsonElement JsonElement (located in System.Text.Json) which allows to navigate through JSON DOM (domain object model) hierarchy using indexer-style syntax (as in collections and dictionaries) for properties and array alike. It also contains useful methods to get values without throwing exceptions. | ||
Target frameworks are .NET 5 and NET Standard 2.0. | ||
|
||
<h2><a name="usage">Usage</a></h2> | ||
|
||
Here is an example: | ||
|
||
```JSON | ||
{ | ||
"Persons": [ | ||
{ | ||
"Id": 0, | ||
"Name": "John", | ||
"SecondName": "Wick", | ||
"NickName": "Baba Yaga" | ||
}, | ||
{ | ||
"Id": 1, | ||
"Name": "Wade", | ||
"SecondName": "Winston", | ||
"NickName": "Deadpool" | ||
} | ||
] | ||
} | ||
``` | ||
|
||
Assume that we are using `System.Text.Json` so we can create JsonDocument: | ||
|
||
```C# | ||
var jsonDocument = JsonDocument.Parse(json); | ||
``` | ||
|
||
Then we convert this JSON document to the `JsonNavigationElement` provided by JsonEasyNavigation library: | ||
|
||
```C# | ||
var nav = jsonDocument.ToNavigation(); | ||
``` | ||
|
||
`JsonNavigationElement` is a struct, a wrapper around JsonElement. This struct provides many useful methods to operate arrays, objects and getting values from the JsonElement inside. | ||
|
||
Now we can easley navigate Domain Object Model using indexers in a sequential style: | ||
|
||
```C# | ||
var arrayItem = nav[0]; // first item in the array | ||
var id = arrayItem["Id"].GetInt32OrDefault(); // 0 | ||
var nickName = arrayItem["NickName"].GetStringOrDefault(); // "Baba Yaga" | ||
``` | ||
|
||
Notice the usage of `GetXxxOrDefault` methods, which provides a convenient way to get values from the JsonElement without throwing exceptions. There are a lot of other similar useful methods. | ||
|
||
We also can check if the property exist: | ||
|
||
```C# | ||
if (nav[0]["Age"].Exist) | ||
{ | ||
// Do something if the Age property of the first object in array exist. | ||
} | ||
``` | ||
|
||
`JsonNavigationElement` does **not** throw exception if a property or array item does not exist. You can always check `Exist` property of an `JsonNavigationElement` to be sure that corresponding `JsonElement` was found. | ||
|
||
It is also possible to map `JsonNavigationElement` into the object of the specific type (using JsonSerializer internally): | ||
|
||
```C# | ||
public class Person | ||
{ | ||
public int Id { get; set; } | ||
public string Name { get; set; } | ||
public string SecondName { get; set; } | ||
public string NickName { get; set; } | ||
} | ||
|
||
// ... | ||
var person = nav[0].Map<Person>(); | ||
``` | ||
|
||
<h2><a name="features">Features</a></h2> | ||
|
||
Overall, the library provides following features: | ||
|
||
* A wrapper around JsonElement encapsulating all behaviour regarding to the DOM traversal and navigation (`JsonNavigationElement`); | ||
* The API is implemented in a no-throw manner - you can "get" properties that don't exist in the DOM and check their existence; | ||
* Implementation of a `IReadOnlyDictionary` and `IReadOnlyCollection`; | ||
* Methods for converting values to the specified types in a type-safe way (and also generic methods like `TryGetValue<T>`); | ||
* Extensions for caching properties and persisting their order for faster and easier JSON navigation. | ||
|
||
<h2><a name="installation">Installation</a></h2> | ||
|
||
This library can be installed using NuGet found [here](https://www.nuget.org/packages/JsonEasyNavigation/). | ||
This library can be installed using GitHub found [here](https://github.com/users/Latency/packages/nuget/package/JsonEasyNavigation). | ||
|
||
<h2><a name="license">License</a></h2> | ||
|
||
This software is distributed under the Apache License 2.0. See [LICENSE].txt. | ||
|
||
All graphical assets are licensed under the [Creative Commons Attribution 3.0 Unported License](https://creativecommons.org/licenses/by/3.0/). | ||
|
||
[//]: # (These are reference links used in the body of this note and get stripped out when the markdown processor does its job.) | ||
|
||
[Creative Commons Attribution 3.0 Unported License]: <https://creativecommons.org/licenses/by/3.0/> | ||
[LICENSE]: <https://www.apache.org/licenses/LICENSE-2.0> | ||
[MSDN article]: <https://msdn.microsoft.com/en-us/library/c5b8a8f9(v=vs.100).aspx> |
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