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‎COPYRIGHT.md‎

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# Copyright
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© 2013 - 2020 [Volosoft](https://volosoft.com/) Open source license with [LGPLv3.0](LICENSE.md)

‎Credits.md‎

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VirtualFileSystem icon made by [photo3idea_studio](https://www.flaticon.com/authors/photo3idea-studio) from [www.flaticon.com](https://www.flaticon.com/)

‎LICENSE.md‎

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GNU LESSER GENERAL PUBLIC LICENSE
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Version 3, 29 June 2007
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Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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Everyone is permitted to copy and distribute verbatim copies
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of this license document, but changing it is not allowed.
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This version of the GNU Lesser General Public License incorporates
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the terms and conditions of version 3 of the GNU General Public
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License, supplemented by the additional permissions listed below.
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0. Additional Definitions.
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As used herein, "this License" refers to version 3 of the GNU Lesser
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General Public License, and the "GNU GPL" refers to version 3 of the GNU
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General Public License.
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"The Library" refers to a covered work governed by this License,
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other than an Application or a Combined Work as defined below.
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An "Application" is any work that makes use of an interface provided
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by the Library, but which is not otherwise based on the Library.
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Defining a subclass of a class defined by the Library is deemed a mode
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of using an interface provided by the Library.
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A "Combined Work" is a work produced by combining or linking an
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Application with the Library. The particular version of the Library
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with which the Combined Work was made is also called the "Linked
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Version".
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The "Minimal Corresponding Source" for a Combined Work means the
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Corresponding Source for the Combined Work, excluding any source code
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for portions of the Combined Work that, considered in isolation, are
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based on the Application, and not on the Linked Version.
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The "Corresponding Application Code" for a Combined Work means the
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object code and/or source code for the Application, including any data
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and utility programs needed for reproducing the Combined Work from the
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Application, but excluding the System Libraries of the Combined Work.
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1. Exception to Section 3 of the GNU GPL.
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You may convey a covered work under sections 3 and 4 of this License
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without being bound by section 3 of the GNU GPL.
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2. Conveying Modified Versions.
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If you modify a copy of the Library, and, in your modifications, a
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facility refers to a function or data to be supplied by an Application
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that uses the facility (other than as an argument passed when the
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facility is invoked), then you may convey a copy of the modified
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version:
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a) under this License, provided that you make a good faith effort to
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ensure that, in the event an Application does not supply the
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function or data, the facility still operates, and performs
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whatever part of its purpose remains meaningful, or
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b) under the GNU GPL, with none of the additional permissions of
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this License applicable to that copy.
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3. Object Code Incorporating Material from Library Header Files.
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The object code form of an Application may incorporate material from
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a header file that is part of the Library. You may convey such object
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code under terms of your choice, provided that, if the incorporated
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material is not limited to numerical parameters, data structure
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layouts and accessors, or small macros, inline functions and templates
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(ten or fewer lines in length), you do both of the following:
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a) Give prominent notice with each copy of the object code that the
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Library is used in it and that the Library and its use are
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covered by this License.
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b) Accompany the object code with a copy of the GNU GPL and this license
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document.
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4. Combined Works.
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You may convey a Combined Work under terms of your choice that,
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taken together, effectively do not restrict modification of the
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portions of the Library contained in the Combined Work and reverse
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engineering for debugging such modifications, if you also do each of
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the following:
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a) Give prominent notice with each copy of the Combined Work that
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the Library is used in it and that the Library and its use are
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covered by this License.
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b) Accompany the Combined Work with a copy of the GNU GPL and this license
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document.
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c) For a Combined Work that displays copyright notices during
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execution, include the copyright notice for the Library among
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these notices, as well as a reference directing the user to the
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copies of the GNU GPL and this license document.
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d) Do one of the following:
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0) Convey the Minimal Corresponding Source under the terms of this
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License, and the Corresponding Application Code in a form
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suitable for, and under terms that permit, the user to
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recombine or relink the Application with a modified version of
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the Linked Version to produce a modified Combined Work, in the
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manner specified by section 6 of the GNU GPL for conveying
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Corresponding Source.
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1) Use a suitable shared library mechanism for linking with the
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Library. A suitable mechanism is one that (a) uses at run time
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a copy of the Library already present on the user's computer
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system, and (b) will operate properly with a modified version
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of the Library that is interface-compatible with the Linked
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Version.
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e) Provide Installation Information, but only if you would otherwise
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be required to provide such information under section 6 of the
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GNU GPL, and only to the extent that such information is
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necessary to install and execute a modified version of the
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Combined Work produced by recombining or relinking the
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Application with a modified version of the Linked Version. (If
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you use option 4d0, the Installation Information must accompany
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the Minimal Corresponding Source and Corresponding Application
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Code. If you use option 4d1, you must provide the Installation
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Information in the manner specified by section 6 of the GNU GPL
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for conveying Corresponding Source.)
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5. Combined Libraries.
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You may place library facilities that are a work based on the
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Library side by side in a single library together with other library
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facilities that are not Applications and are not covered by this
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License, and convey such a combined library under terms of your
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choice, if you do both of the following:
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a) Accompany the combined library with a copy of the same work based
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on the Library, uncombined with any other library facilities,
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conveyed under the terms of this License.
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b) Give prominent notice with the combined library that part of it
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is a work based on the Library, and explaining where to find the
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accompanying uncombined form of the same work.
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6. Revised Versions of the GNU Lesser General Public License.
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The Free Software Foundation may publish revised and/or new versions
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of the GNU Lesser General Public License from time to time. Such new
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versions will be similar in spirit to the present version, but may
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differ in detail to address new problems or concerns.
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Each version is given a distinguishing version number. If the
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Library as you received it specifies that a certain numbered version
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of the GNU Lesser General Public License "or any later version"
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applies to it, you have the option of following the terms and
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conditions either of that published version or of any later version
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published by the Free Software Foundation. If the Library as you
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received it does not specify a version number of the GNU Lesser
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General Public License, you may choose any version of the GNU Lesser
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General Public License ever published by the Free Software Foundation.
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If the Library as you received it specifies that a proxy can decide
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whether future versions of the GNU Lesser General Public License shall
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apply, that proxy's public statement of acceptance of any version is
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permanent authorization for you to choose that version for the
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Library.

‎README.md‎

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# Axuno.VirtualFileSystem
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<img src="https://raw.githubusercontent.com/axuno/Axuno.VirtualFileSystem/main/VirtualFileSystem.png" width="64" alt="Logo">
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# Axuno.VirtualFileSystem
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The Virtual File System makes it possible to manage files that do not exist on a physical file system (e.g. disk).
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* The ```VirtualFileSystem``` can be extended by additional ```IVirtualFileProvider```s.
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* Out-of-the-box, ```Microsoft.Extensions.FileProviders.Composite```, ```Microsoft.Extensions.FileProviders.Embedded``` and ```Microsoft.Extensions.FileProviders.Physical``` are integrated.
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* Virtual files can be used just like static files in an application.
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* JavaScript, CSS, image files and all other web file types can be embedded into assemblies and used just like the static files.
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* An application (or library) can override an embedded file just by placing a static file with the same name and extension into the same folder of the virtual file system.
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The library is a modified version of [Volo.Abp.VirtualFileSystem](https://github.com/abpframework/abp/tree/dev/framework/src/Volo.Abp.VirtualFileSystem) 3.3.1
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Modifications to the source code were made by axuno in 2020. Changes focused on:
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* Decouple Volo.Abp.VirtualFileSystem from all dependencies of the Abp Framework
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* Use Microsoft DependencyInjection instead of [AutoFac](https://autofac.org/)
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* Add a workaround, so that ```VirtualFileProvider``` will also find existing directories returned from ```PhysicalFileProvider```. This means, that ```VirtualFileProvider``` behaves the same, never mind whether files are retrieved using ```EmbeddedFileProvider``` or ```PhysicalFileProvider```.
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* Change of namespaces

‎Src/Axuno.VirtualFileSystem/Axuno.VirtualFileSystem.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>netstandard2.1</TargetFramework>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.Extensions.FileProviders.Composite" Version="3.1.9" />
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<PackageReference Include="Microsoft.Extensions.FileProviders.Embedded" Version="3.1.9" />
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<PackageReference Include="Microsoft.Extensions.FileProviders.Physical" Version="3.1.9" />
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<PackageReference Include="Microsoft.Extensions.Options" Version="3.1.9" />
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</ItemGroup>
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</Project>

‎Src/Axuno.VirtualFileSystem/Check.cs‎

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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace Axuno.VirtualFileSystem
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{
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[System.Diagnostics.DebuggerStepThrough]
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public static class Check
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{
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public static T NotNull<T>(T value, string parameterName)
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{
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if (value == null)
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{
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throw new ArgumentNullException(parameterName);
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}
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return value;
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}
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public static T NotNull<T>(T value, string parameterName, string message)
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{
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if (value == null)
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{
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throw new ArgumentNullException(parameterName, message);
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}
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return value;
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}
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public static string NotNull(string value, string parameterName, int maxLength = int.MaxValue, int minLength = 0)
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{
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if (value == null)
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{
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throw new ArgumentException($"{parameterName} can not be null!", parameterName);
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}
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if (value.Length > maxLength)
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{
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throw new ArgumentException($"{parameterName} length must be equal to or lower than {maxLength}!",
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parameterName);
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}
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if (minLength > 0 && value.Length < minLength)
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{
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throw new ArgumentException($"{parameterName} length must be equal to or bigger than {minLength}!",
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parameterName);
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}
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return value;
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}
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public static string NotNullOrWhiteSpace(string? value, string parameterName, int maxLength = int.MaxValue, int minLength = 0)
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{
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if (string.IsNullOrWhiteSpace(value))
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{
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throw new ArgumentException($"{parameterName} can not be null, empty or white space!",
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parameterName);
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}
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if (value.Length > maxLength)
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{
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throw new ArgumentException($"{parameterName} length must be equal to or lower than {maxLength}!",
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parameterName);
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}
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if (minLength > 0 && value.Length < minLength)
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{
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throw new ArgumentException($"{parameterName} length must be equal to or bigger than {minLength}!",
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parameterName);
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}
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return value;
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}
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public static string NotNullOrEmpty(string? value, string parameterName, int maxLength = int.MaxValue, int minLength = 0)
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{
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if (string.IsNullOrEmpty(value))
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{
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throw new ArgumentException($"{parameterName} can not be null or empty!", parameterName);
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}
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if (value.Length > maxLength)
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{
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throw new ArgumentException($"{parameterName} length must be equal to or lower than {maxLength}!",
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parameterName);
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}
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if (minLength > 0 && value.Length < minLength)
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{
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throw new ArgumentException($"{parameterName} length must be equal to or bigger than {minLength}!",
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parameterName);
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}
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return value;
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}
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public static ICollection<T> NotNullOrEmpty<T>(ICollection<T> value, string parameterName)
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{
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if (value is null || value.Count == 0)
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{
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throw new ArgumentException(parameterName + " can not be null or empty!", parameterName);
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}
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return value;
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}
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public static Type AssignableTo<TBaseType>(Type type, string parameterName)
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{
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NotNull(type, parameterName);
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if (typeof(TBaseType).IsAssignableFrom(type))
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{
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throw new ArgumentException(
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$"{parameterName} (type of {type.AssemblyQualifiedName}) should be assignable to the {typeof(TBaseType).AssemblyQualifiedName}.");
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}
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return type;
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}
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public static Type AssignableFrom<TType>(Type type, string parameterName)
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{
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NotNull(type, parameterName);
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if (type.IsAssignableFrom(typeof(TType)))
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{
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throw new ArgumentException(
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$"{parameterName} (type of {type.AssemblyQualifiedName}) should be assignable from the {typeof(TType).FullName}.");
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}
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return type;
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}
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public static string? Length(string? value, string parameterName, int maxLength, int minLength = 0)
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{
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if (minLength > 0)
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{
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if (string.IsNullOrEmpty(value))
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{
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throw new ArgumentException(parameterName + " can not be null or empty!", parameterName);
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}
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if (value.Length < minLength)
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{
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throw new ArgumentException(
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$"{parameterName} length must be equal to or bigger than {minLength}!", parameterName);
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}
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}
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if (value != null && value.Length > maxLength)
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{
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throw new ArgumentException($"{parameterName} length must be equal to or lower than {maxLength}!",
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parameterName);
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}
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return value;
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}
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}
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}

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