C# winform基于最小二乘法计算斜率

# EPPlus 6 ## Announcement: new license model from version 5 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/). 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. This is explained in more detail [here](https://www.epplussoftware.com/Home/LgplToPolyform). Commercial licenses, which includes support, can be purchased at (https://www.epplussoftware.com/). The source code of EPPlus has moved to a [new github repository](https://github.com/EPPlusSoftware/EPPlus) ## LicenseContext parameter must be set 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). This is a simple configuration that can be set in a few alternative ways: ### 1. Via code ```csharp // If you are a commercial business and have // purchased commercial licenses use the static property // LicenseContext of the ExcelPackage class : ExcelPackage.LicenseContext = LicenseContext.Commercial; // If you use EPPlus in a noncommercial context // according to the Polyform Noncommercial license: ExcelPackage.LicenseContext = LicenseContext.NonCommercial; using(var package = new ExcelPackage(new FileInfo("MyWorkbook.xlsx"))) { } ``` ### 2. Via appSettings.json ```json { { "EPPlus": { "ExcelPackage": { "LicenseContext": "Commercial" //The license context used } } } } ``` ### 3. Via app/web.config ```xml <appSettings> <!--The license context used--> <add key="EPPlus:ExcelPackage.LicenseContext" value="NonCommercial" /> </appSettings> ``` ### 4. Set the environment variable 'EPPlusLicenseContext' This might be the easiest way of configuring this. Just as above, set the variable to Commercial or NonCommercial depending on your usage. **Important!** The environment variable should be set at the user or process level. ## New features in EPPlus 6 EPPlus 6 comes with a set of new features, see (https://www.epplussoftware.com/Developers/Features) ## Breaking Changes * From version 6.2, updating data validations via the XML DOM will not work as read and write is performed on load/save. ExcelDataValidation.IsStale is deprecated and will always return false. * 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). * Static class 'FontSize' has splitted width and heights into two dictionaries. FontSizes are lazy-loaded when needed. * ...and more, see https://epplussoftware.com/docs/6.0/articles/breakingchanges.html ### Breaking Changes in version 5. * 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. * Pictures have changed the behavior as the oneCellAnchor tag is used instead of the twoCellAnchor tag with the editAs="oneCell". ## Improved documentation 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) There is also a new sample project for four different docker images, [EPPlus.DockerSample](https://github.com/EPPlusSoftware/EPPlus.DockerSample) 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. There is also an updated [developer wiki](https://github.com/EPPlusSoftware/EPPlus/wiki). The work with improving the documentation will continue, feedback is highly appreciated!