Skip to main content

Central Package Management - warning NU1507: There are 2 package sources defined in your configuration.

A few weeks ago, I talked about a new NuGet feature, Central Package Management. This allows you to manage your dependencies at the solution level instead of at the project level.

After converting one of my projects to use Central Package Management, I noticed the following warning in Visual Studio:

warning NU1507: There are 2 package sources defined in your configuration.

When using central package management, please map your package sources with package source mapping ( or specify a single package source. The following sources are defined:,

I get this warning because I have 2 package sources defined, one at the machine level and one at the solution level in my nuget.config.

I could get rid of this warning by using a single package source.Therefore I need to update my nuget.config file to have only 1 package source defined and add a <clear /> statement to not use package sources found at other levels:

Another solution is to use Package Source Mapping as suggested in the warning.

What is Package Source Mapping?

With Package Source Mapping, you can define from which source each package in your solution should be restored. This is important to improve security when you use a mix of public and private package sources and helps you against software supply chain attacks.

To use Package Source Mapping, you need to update your nuget.config file and specify one or more package patterns:

In the example above a packageSourceMapping element was added in which we declared a packageSource element for each source in use. Per source we defined a pattern that(it can be more then one) links the package name to the correct source.

In our example, packages started with company.* will use the private package source. All other packages come from the public package source.

If you want to learn more, have a look at the documentation.

Popular posts from this blog

XUnit - Assert.Collection

A colleague asked me to take a look at the following code inside a test project: My first guess would be that this code checks that the specified condition(the contains) is true for every element in the list.  This turns out not to be the case. The Assert.Collection expects a list of element inspectors, one for every item in the list. The first inspector is used to check the first item, the second inspector the second item and so on. The number of inspectors should match the number of elements in the list. An example: The behavior I expected could be achieved using the Assert.All method:

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.

Angular --deploy-url and --base-href

As long you are running your Angular application at a root URL (e.g. ) you don’t need to worry that much about either the ‘--deploy-url’ and ‘--base-href’ parameters. But once you want to serve your Angular application from a server sub folder(e.g. ) these parameters become important. --base-href If you deploy your Angular app to a subfolder, the ‘--base-href’ is important to generate the correct routes. This parameter will update the <base href> tag inside the index.html. For example, if the index.html is on the server at /angularapp/index.html , the base href should be set to <base href="/angularapp/"> . More information: --deploy-url A second parameter that is important is ‘--deploy-url’. This parameter will update the generated url’s for our assets(scripts, css) inside the index.html. To make your assets available at /angularapp/, the deploy url should