# EPPlus 7
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## Announcement: new license model from version 5
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EPPlus has from this new major version changed license from LGPL to [Polyform Noncommercial 1.0.0](https://polyformproject.org/licenses/noncommercial/1.0.0/).
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With the new license EPPlus is still free to use in some cases, but will require a commercial license to be used in a commercial business.
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This is explained in more detail [here](https://www.epplussoftware.com/Home/LgplToPolyform).
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Commercial licenses, which includes support, can be purchased at (https://www.epplussoftware.com/).
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The source code of EPPlus has moved to a [new github repository](https://github.com/EPPlusSoftware/EPPlus)
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## LicenseContext parameter must be set
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With the license change EPPlus has a new parameter that needs to be configured. If the LicenseContext is not set, EPPlus will throw a LicenseException (only in debug mode).
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This is a simple configuration that can be set in a few alternative ways:
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### 1. Via code
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```csharp
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// If you are a commercial business and have
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// purchased commercial licenses use the static property
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// LicenseContext of the ExcelPackage class :
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ExcelPackage.LicenseContext = LicenseContext.Commercial;
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// If you use EPPlus in a noncommercial context
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// according to the Polyform Noncommercial license:
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ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
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using(var package = new ExcelPackage(new FileInfo("MyWorkbook.xlsx")))
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{
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}
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```
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### 2. Via appSettings.json
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```json
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{
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{
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"EPPlus": {
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"ExcelPackage": {
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"LicenseContext": "Commercial" //The license context used
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}
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}
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}
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}
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```
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### 3. Via app/web.config
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```xml
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<appSettings>
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<!--The license context used-->
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<add key="EPPlus:ExcelPackage.LicenseContext" value="NonCommercial" />
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</appSettings>
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```
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### 4. Set the environment variable 'EPPlusLicenseContext'
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This might be the easiest way of configuring this. Just as above, set the variable to Commercial or NonCommercial depending on your usage.
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**Important!** The environment variable should be set at the user or process level.
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## New features in EPPlus 7 preview 1
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* Calculation engine update to array formulas. https://github.com/EPPlusSoftware/EPPlus/wiki/EPPlus-7-Preview
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* Support for calculating legacy / dynamic array formulas.
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* Support for intersect operator.
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* Support for Implicit intersection.
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* Support for array parameters in functions.
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* Better support for using the colon operator with functions.
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* 21 new functions
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## Breaking Changes
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The formula parser has changed significantly in EPPlus 7, requiring all custom functions that inherits from the `ExcelFunction` class to be reviewed.
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The `ExcelFunction` class now exposes new properties used to handle array results and condition behaviour.
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* `NamespacePrefix` - If the function requires a prefix when saved, for example "_xlfn." or "_xlfn._xlws."
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* `HasNormalArguments` a boolean indicating if the formula only has normal arguments. If false, the `GetParameterInfo` method must be implemented. Default is true.
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* `ReturnsReference` - If true the function can return a reference to a range. Use the `CreateAddressResult` to return the result with a reference. Returning a reference, will cause the dependency chain to check the address and will allow the colon operator to be used with the function.
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* `IsVolatile` - If the function returns different result when called with the same parameters. Default false.
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* `ArrayBehaviour` - If the function allows arrays as input in a parameter, resulting in an array output. Also see the `GetArrayBehaviourConfig` method.
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Methods
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* `CreateAddressResult` - Return the result with an range to a range.
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* `CreateDynamicArrayResult` - The result should be treated as a dynamic array.
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* `GetArrayBehaviourConfig` - Sets the index if the parameters that can be arrays. Also see the `ArrayBehaviour` property.
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* The source code tokenizer now tokenize more detailed, tokenizing addresses.
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* The expression handling is totally rewritten and now uses reversed polish notation instead of group expressions.
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### Breaking Changes in version 6.1
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* All public references to System.Drawing.Common has been removed from EPPlus. See [Breaking Changes in EPPlus 6](https://github.com/EPPlusSoftware/EPPlus/wiki/Breaking-Changes-in-EPPlus-6).
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* Static class 'FontSize' has splitted width and heights into two dictionaries. FontSizes are lazy-loaded when needed.
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* ...and more, see https://epplussoftware.com/docs/6.0/articles/breakingchanges.html
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### Breaking Changes in version 5.
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* The default behavior for the Worksheet collection base in .NET Framework has changed from 1 to 0. This is the same default behavior as in .NET core today.
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* Pictures have changed the behavior as the oneCellAnchor tag is used instead of the twoCellAnchor tag with the editAs="oneCell".
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## Improved documentation
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EPPlus 6 has a new web sample site available here: (https://samples.epplussoftware.com/) , Source code is available here: [EPPlus.WebSamples](https://github.com/EPPlusSoftware/EPPlus.WebSamples)
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There is also a new sample project for four different docker images, [EPPlus.DockerSample](https://github.com/EPPlusSoftware/EPPlus.DockerSample)
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EPPlus also has two separate sample projects for [.NET Core](https://github.com/EPPlusSoftware/EPPlus.Sample.NetCore/tree/version/EPPlus6.0) and [.NET Framework](https://github.com/EPPlusSoftware/EPPlus.Sample.NetFramework/tree/version/EPPlus6.0) respectively.
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There is also an updated [developer wiki](https://github.com/EPPlusSoftware/EPPlus/wiki).
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The work with improving the documentation will continue, feedback is highly appreciated!
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