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Fetching NuGet Packages5:41 with Jeremy McLain
How to find and install NuGet packages using Visual Studio.
To use NuGet, we go to this Solution Explorer, and 0:00 right click on References in the project, and click Manage NuGet Packages. 0:02 NuGet opens up as a tab in the main workspace. 0:08 Up here we have Browse, Installed, and Updates. 0:12 Under Browse a list of the most popular and 0:16 recently downloaded packages is displayed. 0:19 Now right away we see this Newtonsoft.Json in the list. 0:22 Let's ignore that for right now. 0:26 If we want to see all of the packages that had the word Json in their name or 0:28 description, we can type Json here in the search field. 0:31 The result shown are ordered by relevance and popularity. 0:36 We can see that Newtonsoft.Json is at the top of the list. 0:39 But there are other packages that also seem to have something to do with 0:43 working with JSON. 0:47 Maybe one of these packages would better suit us. 0:48 We can get more information about the selected package 0:51 by looking over here on the right side. 0:54 This shows us details about the package. 0:56 We see a description of the package, the latest version number, 0:59 a link to information about its license, and 1:02 a link to the web page that can tell us more about the package. 1:05 There isn't a lot of information here, but we can click on this link or 1:08 search the web for more information. 1:12 We can tell that this Newtonsoft.json package is by far the most popular. 1:14 So we'll go with that for now. 1:20 Over here beside the install button, there's a dropdown that allows us to 1:22 select which version of the package we want to install. 1:25 in most cases, the package version number 1:29 matches the version number of the library that it contains. 1:31 The latest stable version of the package that will work with the version 1:35 of .NET that our project targets is selected by default. 1:38 We can opt to download a previous version if we want though. 1:41 And there are times we might want to do that, which we'll talk about later. 1:45 For now, let's install the latest version by clicking Install. 1:48 We'll see a confirmation dialog pop up that confirms with us that we want to 1:52 install the package into our solution and add it to the JsonToDb project. 1:56 After clicking Yes, check out the output window down here. 2:01 If we look up here, 2:05 we can see that it opened a new tab with a readme file about this library. 2:05 The readme file contains more information that we might want to 2:11 know about the library. 2:14 We'll close this for right now. 2:16 We can see that it added a check mark to the package, and 2:18 if we click on the Install tab we see it listed as an installed package. 2:22 In the Solution Explorer we can see what else happened. 2:27 We can see that the Newtonsoft.Json assembly, 2:31 is now listed as one of our references. 2:34 Because this is the first NuGet package that was added to the project, 2:37 we now have a new file in the project named packages.config. 2:41 Let's take a look at that file. 2:46 It's an XML file that lists the NuGet packages that our project depends on. 2:47 Notice that it not only says which version of the package our project needs but 2:52 also which version of .NET we're targeting when we downloaded the file. 2:57 In order to write to the database, we'll also need Entity Framework. 3:02 \Entity framework is a framework for mapping objects and 3:05 code to objects such as tables in a database. 3:09 Although Entity Framework is Microsoft product. 3:12 It's not part of the .NET Framework. 3:15 So we'll need to add it using NuGet. 3:17 The list of packages that's displayed here is called the NuGet Package Gallery. 3:19 And as you can see, Entity Framework is also a commonly downloaded package. 3:24 Let's select it and click Install to add it to our project. 3:30 We see the confirmation dialog, and next we see another dialog for 3:35 us to either accept or decline the license. 3:40 Software and libraries that are distributed to the public 3:43 often have a license that dictates how the software can and cannot be used. 3:46 It's always up to the user of the software to make sure that they're using it in 3:51 compliance with its license. 3:55 Sometimes the licenses are very permissive. 3:57 The most permissive licenses simply say that the manufacturer or 4:00 distributor of the software is not liable for 4:03 anything bad that might happen as a result of using the software. 4:06 Often times, licenses state if and how the software can be redistributed. 4:09 Many licenses state the circumstances under which you may allow other people 4:15 other than yourself to use the software or library. 4:19 Just because code is open source doesn't mean we can do whatever we want with it. 4:23 For example, some open source libraries have fairly restrictive licenses which 4:28 state that if you want to use the library in your own application. 4:32 You also have to make all of the source code of your application available to 4:36 the public for free. 4:40 Unless that is, 4:41 you have express permission from the originator of the library. 4:42 It doesn't matter if you're using it for commercial purposes or not. 4:46 I can't give you more legal advice than this, but 4:49 I can say that it's important to respect the terms of all software licenses. 4:52 And don't assume that a library can be used in the way you expect it should be 4:57 able to be used. 5:01 For more information about the various software licenses you 5:02 might find out there, check the teacher's notes of this workshop. 5:05 You can read the license for Entity Framework. 5:09 After reading the license, I know I'm well within the terms to download it and 5:11 use it for what we want to do today. 5:14 So I'm going to click I Accept. 5:16 If you want to go back and read the license for 5:19 any package, you can usually find a link to it in the package details in NuGet. 5:20 If you see this dialog pop up, 5:25 it just means that you have the packages.config file open. 5:27 It's asking if it can save changes to an open file. 5:31 We'll say Yes to All. 5:35 We don't need this file open, so I'll close it now. 5:38
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