As a consequence, solution build customization using before. Prior to this change, project files explicitly imported the. NET Core projects import the version of the. See the overview,.
This section discusses how these input files are processed and parsed to produce in-memory objects that determine what will be built. The purpose of the evaluation phase is to create the object structures in memory based on the input XML files and local environment.
The evaluation phase consists of six passes that process the input files such as the project XML files or, and the imported XML files, generally named as.
Each pass builds a part of the in-memory objects that are later used in the execution phase to build the projects, but no actual build actions occur during the evaluation phase. Within each pass, elements are processed in the order in which they appear. The order of these passes has significant implications and is important to know when customizing the project file. See Property and item evaluation order. In this phase, environment variables are used to set equivalent properties. When run from the command line or a script, the command environment is used as normal, and when run from Visual Studio, the environment in effect when Visual Studio launches is used.
In this phase, the entire input XML is read in, including the project files and the entire chain of imports. At this time, properties that aren't in targets are evaluated and set.
As a consequence of MSBuild reading all the XML input files early on in its process, any changes to those inputs during the build process don't affect the current build. Properties outside of any target are handled differently from properties within targets. In this phase, only the properties defined outside of any target are evaluated. Because properties are processed in order in the properties pass, a property at any point in the input can access property values that appear earlier in the input, but not properties that appear later.
Because the properties are processed before items are evaluated, you can't access the value of any item during any part of the properties pass. In this phase, item definitions are interpreted and an in-memory representation of these definitions is created. Items defined inside a target are handled differently from items outside any target. In this phase, items outside any target, and their associated metadata, are processed.
Metadata set by item definitions is overridden by metadata set on items. Because items are processed in the order that they appear, you can reference items that have been defined earlier, but not ones that appear later. Because the items pass is after the properties pass, items can access any property if defined outside any targets, regardless of whether the property definition appears later.
In this phase, UsingTask elements are read, and the tasks are declared for later use during the execution phase. In this phase, all target object structures are created in memory, in preparation for execution. No actual execution takes place.
In the execution phase, the targets are ordered and run, and all tasks are executed. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. MSBuild provides a set of predefined properties that store information about the project file and the MSBuild binaries. These properties are evaluated in the same manner as other MSBuild properties.
MSBuild uses the values in the following table to predefine reserved and well-known properties. Reserved properties cannot be overridden, but well-known properties can be overridden by using identically named environment properties, global properties, or properties that are declared in the project file.
The table in this section shows the MSBuild predefined properties. In addition to the above, names corresponding to MSBuild language elements cannot be used for user-defined properties, items, or item metadata:. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. However, if your build includes a task that is bit only and does not correctly mark itself as a bit task, your build may fail.
The best way to know if this will affect you is by testing your build with a bit version of MSBuild. MSBuild is part of both Visual Studio and the. The changes described here affect only the Visual Studio MSBuild and will not affect builds started through dotnet build.
MSBuild has both and bit executables. For GitHub Actions, the setup-msbuild action allows for specifying this same setting using msbuild-architecture: 'x64'.
Changes in Windows between environments may cause problems, if part of your build has a dependency on the bit filesystem or registry redirection. If you maintain a task, you do not have to rewrite it to run in a bit environment. Instead, you can mark it so that MSBuild runs it in a process with the correct bitness: the bit version of MSBuild can start bit tasks out of process, as the bit version can start bit tasks.
BuildTools MSBuild tasks are. You use them in your normal build, even if you have never written one. If a task is not compatible with bit MSBuild, the task may not be found or it may throw an error. Contact the task owner such as by filing an issue in their repo , possibly referencing this breaking change blog post.
You have the option of rewriting your task to support running in a or bit environment and deploying both copies of native assemblies, but this is often difficult, so you may prefer to configure MSBuild to run your task in a bit process even from a bit build.
The version of the. The path to the fxcop. The fxcop. Path to the directory specified for intermediate files. If it's a relative path, intermediate files go to this path appended to the project directory. This path should have a trailing slash. It resolves to the value for the Intermediate Directory property.
Path to the output file directory. If it's a relative path, output files go to this path appended to the project directory. It resolves to the value for the Output Directory property. Set to the value of the Remote Machine property on the Debug property page. Defined only when building a solution in the IDE. The file extension of the solution.
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