This C# sample demonstrates the use of the Google Cloud Natural Language API for sentiment, entity, and syntax analysis.

This sample requires .NET Core 2.0 or later. That means using Visual Studio 2017, or the command line. Visual Studio 2015 users can use this older sample.

1. Follow the set-up instructions in the documentation.

2. Enable APIs for your project. Click here to visit Cloud Platform Console and enable the Natural Language API.

3. From a Powershell command line, run the QuickStart sample:

   PS C:\...\dotnet-docs-samples\language\api\QuickStart> dotnet restore
   PS C:\...\dotnet-docs-samples\language\api\QuickStart> dotnet run
   Score: 0.2
   Magnitude: 0.2
   

4. And run the Analyze sample to see a list of possible commands:

   PS C:\...\dotnet-docs-samples\language\api\Analyze> dotnet restore
   PS C:\...\dotnet-docs-samples\language\api\Analyze> dotnet run
   
   Usage:
   C:\> dotnet run command text
   C:\> dotnet run command gs://bucketName/objectName
   
   Where command is one of
       entities
       sentiment
       syntax
       entity-sentiment
       classify-text
       everything
   

   Each command will write to STDOUT the json returned from the API for the requested feature.

   For example, if you run:

   c:\> dotnet run everything Santa Claus Conquers the Martians is a terrible movie. It's so bad, it's good. This is a classic example.
   

   You will see something like the following returned:

   Language: en
   

Overall document sentiment: Score: -0.2 Magnitude: 1.2 Sentence level sentiment: Santa Claus Conquers the Martians is a terrible movie.: (-0.8) Its so bad, its good.: (-0.1) This is a classic example.: (0.2) Sentences: 0: Santa Claus Conquers the Martians is a terrible movie. 55: Its so bad, its good. 77: This is a classic example. Tokens: Noun Santa Noun Claus Verb Conquers Det the Noun Martians Verb is Det a Adj terrible Noun movie Punct . Pron Its Adv so Adj bad Punct , Pron its Noun good Punct . Det This Verb is Det a Adj classic Noun example Punct . Entities: Name: example Type: Other Salience: 0.4282109 Mentions: 95: example Metadata: Name: movie Type: WorkOfArt Salience: 0.2955778 Mentions: 48: movie Metadata: Name: Santa Claus Conquers the Martians Type: WorkOfArt Salience: 0.2410378 Mentions: 0: Santa Claus Conquers the Martians Metadata: mid: /m/0122r8 wikipedia_url: https://en.wikipedia.org/wiki/Santa_Claus_Conquers_the_Martians Name: good Type: Other Salience: 0.03517342 Mentions: 71: good Metadata: Entity Sentiment: example (42%) Score: 0.9 Magnitude 1.8 movie (29%) Score: -0.9 Magnitude 0.9 Santa Claus Conquers the Martians (24%) Score: -0.9 Magnitude 0.9 good (3%) Score: 0 Magnitude 0 Categories: Category: /Hobbies & Leisure/Special Occasions/Holidays & Seasonal Events Confidence: 0.81 Category: /People & Society/Religion & Belief Confidence: 0.8 Category: /Arts & Entertainment/Movies Confidence: 0.72 Category: /People & Society/Kids & Teens/Children's Interests Confidence: 0.63 ```

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