1
00:00:00,510 --> 00:00:03,880
We now know how to receive
data from a web resource.

2
00:00:03,880 --> 00:00:07,760
Let's learn about how to
send data to a web resource.

3
00:00:07,760 --> 00:00:12,090
We'll be using another Microsoft API
called text analytics.

4
00:00:12,090 --> 00:00:14,190
I've got a demo up of it here.

5
00:00:14,190 --> 00:00:19,430
This web service analyzes a piece of
text for sentiment, topics and language.

6
00:00:19,430 --> 00:00:21,148
All we do is send it some text.

7
00:00:21,148 --> 00:00:28,700
I love C#.

8
00:00:28,700 --> 00:00:32,250
And it comes back with
analysis of the text we sent.

9
00:00:32,250 --> 00:00:35,031
It says our sentence is 82% positive.

10
00:00:35,031 --> 00:00:36,890
I'd agree with that.

11
00:00:36,890 --> 00:00:40,199
Let's see what it says If I type in
something a little less positive.

12
00:00:41,730 --> 00:00:44,300
I hate lima beans.

13
00:00:46,890 --> 00:00:53,127
Analyze, it detected our text
was much less positive 10%.

14
00:00:53,127 --> 00:00:57,760
We can use this service to analyze the
sentiment in each of our news headlines.

15
00:00:58,800 --> 00:01:00,850
Let's click on getting started.

16
00:01:02,980 --> 00:01:07,580
Let's see to follow along you
need to follow the steps and

17
00:01:07,580 --> 00:01:10,650
task one here in order to get an API key.

18
00:01:10,650 --> 00:01:14,210
It's a different key from the one
we used earlier for a new search.

19
00:01:14,210 --> 00:01:17,249
Feel free to posit video and
get your API key ready.

20
00:01:19,785 --> 00:01:25,960
Okay here's task two,
says we'll need to use these headers.

21
00:01:25,960 --> 00:01:27,090
We'll get back to that in a bit.

22
00:01:29,230 --> 00:01:32,200
Let's see,
we're going to need two new classes.

23
00:01:32,200 --> 00:01:34,900
One for our request data and
one for response data.

24
00:01:35,980 --> 00:01:39,180
Here, it's telling us how
to format our request.

25
00:01:39,180 --> 00:01:42,230
Let's copy and paste this into
a new class in our application.

26
00:01:44,420 --> 00:01:50,212
Add class, we'll call it,
SentimentRequest.

27
00:01:54,249 --> 00:02:01,520
Then, edit, Paste Special,
Paste JSON As Classes.

28
00:02:01,520 --> 00:02:03,820
No, it didn't like that.

29
00:02:05,680 --> 00:02:08,630
This sample has some invalid JSON,

30
00:02:08,630 --> 00:02:13,050
we can use a JSON validation service
to try and figure out what's wrong.

31
00:02:13,050 --> 00:02:18,110
Head to google and JSON validation

32
00:02:18,110 --> 00:02:21,880
service, we'll use this one JSONLint.

33
00:02:23,700 --> 00:02:26,940
Let's paste our JSON here and
then click validate.

34
00:02:29,810 --> 00:02:31,690
It's got line five highlighted, but

35
00:02:31,690 --> 00:02:35,260
I think the problem is
these ellipses right here.

36
00:02:35,260 --> 00:02:37,910
Let's delete that and try again.

37
00:02:37,910 --> 00:02:41,010
Validate, all right, valid JSON.

38
00:02:42,110 --> 00:02:45,935
Let's copy this and go back over and
try to paste it into our class again.

39
00:02:45,935 --> 00:02:52,130
Edit, Paste Special,
Paste JSON as Classes.

40
00:02:52,130 --> 00:02:57,137
All right, let's rename Rootobject
to SentimentRequest and

41
00:02:57,137 --> 00:03:05,987
we'll change this array to a list,
List documents and

42
00:03:05,987 --> 00:03:11,268
I'd like to change
the properties to capitals.

43
00:03:15,208 --> 00:03:17,468
And we'll need our JsonProperty again.

44
00:03:20,725 --> 00:03:27,031
JsonProperty all right,

45
00:03:27,031 --> 00:03:33,920
PropertyName=document.

46
00:03:33,920 --> 00:03:38,636
Copy that, that's an id,

47
00:03:38,636 --> 00:03:42,950
and then our text field.

48
00:03:46,250 --> 00:03:50,030
Okay, now we need a class for
our response data.

49
00:03:50,030 --> 00:03:52,294
We can go back and get the response JSON.

50
00:03:55,788 --> 00:03:58,020
Here it is, sentiment response.

51
00:03:59,900 --> 00:04:03,090
Copy and paste that, it looks like
we've got our ellipses again.

52
00:04:03,090 --> 00:04:09,175
Let's use JSONLint,
take out this ellipsis and validate.

53
00:04:09,175 --> 00:04:16,310
Uh-oh, think we've got an extra
comma here, good thing we checked.

54
00:04:16,310 --> 00:04:19,180
Validate and valid Json.

55
00:04:20,550 --> 00:04:25,146
So we'll do the same
thing back in our code,

56
00:04:25,146 --> 00:04:28,500
add another class, add class,

57
00:04:28,500 --> 00:04:33,979
then this is going to be
called SentimentResponse.

58
00:04:38,958 --> 00:04:42,835
And one more time Paste Special,
paste JSON as classes.

59
00:04:42,835 --> 00:04:43,680
All right, great.

60
00:04:45,290 --> 00:04:50,452
Rename the root object
to SentimentResponse

61
00:04:50,452 --> 00:04:53,585
change our array to a list.

62
00:04:57,677 --> 00:05:03,010
And, we've got a little red
squiggly line right here.

63
00:05:03,010 --> 00:05:06,300
I think it's because we've got
two document classes defined, and

64
00:05:06,300 --> 00:05:08,060
they're conflicting.

65
00:05:08,060 --> 00:05:10,300
Well there are a lot of things
we could do to fix this,

66
00:05:10,300 --> 00:05:13,919
but the simplest I can think of is
to rename one of these classes.

67
00:05:15,120 --> 00:05:19,280
Well the response is giving us an ID and
a score.

68
00:05:19,280 --> 00:05:21,690
That's not really a document is it?

69
00:05:21,690 --> 00:05:25,590
Let's rename this to sentiment and

70
00:05:25,590 --> 00:05:30,740
then we'll need to change the list
up here and the name to sentiments.

71
00:05:30,740 --> 00:05:33,660
Then we'll need our JSON property.

72
00:05:33,660 --> 00:05:38,395
JSON property, you'll be an expert
at the quick actions by now.

73
00:05:38,395 --> 00:05:44,833
And property name equals documents,

74
00:05:44,833 --> 00:05:50,263
and we'll capitalize our ID and

75
00:05:50,263 --> 00:05:53,290
score down here.

76
00:05:53,290 --> 00:05:56,510
ID capital I, and

77
00:05:56,510 --> 00:06:02,535
one more time for score, Score.

78
00:06:02,535 --> 00:06:08,450
Okay, that looks good.

79
00:06:08,450 --> 00:06:11,890
Now we can get our method set up to
make the request to the web service.

80
00:06:13,140 --> 00:06:17,770
Since the request can have more than one
piece to analyze, we can give the method

81
00:06:17,770 --> 00:06:21,330
a list of news results and then have
it return the sentiment response.

82
00:06:22,650 --> 00:06:29,770
All the way down here,
public static SentimentResponse,

83
00:06:31,040 --> 00:06:34,910
and we'll call it GetSentimentResponse.

84
00:06:36,010 --> 00:06:39,946
It'll take a list of NewsResults,

85
00:06:39,946 --> 00:06:44,018
and we'll call those newsResults.

86
00:06:46,985 --> 00:06:54,008
And we'll go ahead and
var SentimentResponse=

87
00:06:54,008 --> 00:06:59,660
new SentimentResponse and return it,

88
00:06:59,660 --> 00:07:04,290
so that visual studio is happy.

89
00:07:04,290 --> 00:07:10,329
Okay, now we'll also
need a SentimentRequest,

90
00:07:10,329 --> 00:07:15,950
SentimentRequest = new SentimentRequest.

91
00:07:19,190 --> 00:07:23,160
Okay but we need to add data to
this SentimentRequest object.

92
00:07:24,460 --> 00:07:27,710
We can use a foreach loop to iterate
through our news results and

93
00:07:27,710 --> 00:07:29,776
add data to our SentimentRequest object.

94
00:07:29,776 --> 00:07:34,961
foreach(var result in

95
00:07:34,961 --> 00:07:39,920
newsResults), and
then inside the foreach loop,

96
00:07:39,920 --> 00:07:44,205
we'll add a new document to the list that
contains the text from each news result.

97
00:07:44,205 --> 00:07:51,530
sentimentRequest.Documents.Add,we can

98
00:07:51,530 --> 00:07:55,220
use object initialization here to
create an instance of a document

99
00:07:55,220 --> 00:07:57,450
as we add it to the list.

100
00:07:57,450 --> 00:08:02,130
New document, in a curly brace.

101
00:08:02,130 --> 00:08:04,365
I can use a space here to get it.

102
00:08:04,365 --> 00:08:10,425
Okay, we've got ID equals,
we'll l use the headline as the ID,

103
00:08:10,425 --> 00:08:17,690
result.Headline, and then Text equals,

104
00:08:17,690 --> 00:08:22,450
it should be the summary, result.Summary.

105
00:08:22,450 --> 00:08:24,730
There's one thing we need to do,

106
00:08:24,730 --> 00:08:29,770
we need to instantiate this Documents
to a new list of documents.

107
00:08:29,770 --> 00:08:36,570
So sentimentRequest.Documents
= new list of document.

108
00:08:38,080 --> 00:08:39,470
If we didn't do this and

109
00:08:39,470 --> 00:08:43,420
tried to add a document to the list,
we'd end up with a runtime error.

110
00:08:44,550 --> 00:08:46,680
Now we can create our web client.

111
00:08:46,680 --> 00:08:49,506
We can copy and
paste from our news requests to start

112
00:09:01,187 --> 00:09:04,830
But this download data isn't
the method we're going to use.

113
00:09:05,960 --> 00:09:07,600
We need to send data.

114
00:09:07,600 --> 00:09:15,310
There's a different method on web
client called upload data .UploadData,

115
00:09:15,310 --> 00:09:18,930
we can see that it wants a byte
array in addition to the url.

116
00:09:18,930 --> 00:09:20,990
I think we can handle that.

117
00:09:20,990 --> 00:09:25,730
We've already got our API key header but
we'll need to insert our new API key.

118
00:09:27,380 --> 00:09:33,760
Make sure to use your own, and there
was some additional headers it wanted.

119
00:09:34,830 --> 00:09:36,350
Let's go back to the documentation.

120
00:09:36,350 --> 00:09:41,130
I think it was up here, there they are.

121
00:09:42,380 --> 00:09:45,750
We need two more content type and accept.

122
00:09:45,750 --> 00:09:49,050
We saw accept earlier on
those standard headers.

123
00:09:49,050 --> 00:09:53,923
We'll copy this value since it's the same
for both, head back over the code.

124
00:09:56,698 --> 00:10:04,314
Okay, webClient.Headers.Add.

125
00:10:04,314 --> 00:10:09,420
And we'll use this enum here, Accept and

126
00:10:09,420 --> 00:10:14,781
we'll pass in the value
which is application/JSON.

127
00:10:14,781 --> 00:10:18,219
And web client.headers.Add,

128
00:10:18,219 --> 00:10:23,251
one more content type there
it is at the bottom and

129
00:10:23,251 --> 00:10:26,823
we'll pass application/JSON.

130
00:10:26,823 --> 00:10:33,990
We'll go ahead and
change this search results to response.

131
00:10:33,990 --> 00:10:36,050
We're almost ready to make this request.