我在单个 Visual Studio (2008) 解决方案中有多个项目。
我刚刚发现这些项目中的每一个都使用相同的 GUID，所以在解决方案文件中它看起来像这样：
Project("{FAE04EC0-F103-D311-BF4B-00C04FCBFE97}") = "Pro1", "Pro1\Pro1.csproj", "{...}"
Project("{FAE04EC0-F103-D311-BF4B-00C04FCBFE97}") = "Pro2", "Pro2\Pro2.csproj", "{...}"
我是否必须更改这些 GUID，使它们独一无二，它们的用途是什么？
解决方案文件中的项目持久性块具有以下格式：
Project("{project type GUID}") = "<Project name>", "<project file location>",
"{<Unique project GUID>}"
EndProject
因此，预计第一个 GUID 是非唯一的，它唯一标识处理此类项目的 Visual Studio 包。
您发布的 GUID 很有趣 - 它看起来像损坏的 C# 项目 GUID，即 FAE04EC0-301F-11D3-BF4B-00C04F79EFBC。您是自己更改还是发布问题（例如，您使用的是从右到左的语言环境，例如希伯来语或阿拉伯语）。
第一个 GUID 是项目类型。可以在此处找到项目类型 GUID：
http://www.codeproject.com/Reference/720512/List-of-Visual-Studio-Project-Type-GUIDs
从链接：
创建 Visual Studio 项目后，没有一种简单的方法可以更改项目的类型；例如，将 C# 类库更改为可移植类库 (PCL)。了解这些 GUID 将允许您编辑 .csproj 和 .vbproj 等项目文件，以便在 Visual Studio 不允许使用 GUI 的情况下轻松更改项目类型。
+------------------------------------------------+----------------------------------------+
| Project Type | GUID
+------------------------------------------------+----------------------------------------+
| .NET Core | {9A19103F-16F7-4668-BE54-9A1E7A4F7556} |
| ASP.NET 5 | {8BB2217D-0F2D-49D1-97BC-3654ED321F3B} |
| ASP.NET MVC 1 | {603C0E0B-DB56-11DC-BE95-000D561079B0} |
| ASP.NET MVC 2 | {F85E285D-A4E0-4152-9332-AB1D724D3325} |
| ASP.NET MVC 3 | {E53F8FEA-EAE0-44A6-8774-FFD645390401} |
| ASP.NET MVC 4 | {E3E379DF-F4C6-4180-9B81-6769533ABE47} |
| ASP.NET MVC 5 | {349C5851-65DF-11DA-9384-00065B846F21} |
| C# | {FAE04EC0-301F-11D3-BF4B-00C04F79EFBC} |
| C++ | {8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942} |
| Database | {A9ACE9BB-CECE-4E62-9AA4-C7E7C5BD2124} |
| Database (other project types) | {4F174C21-8C12-11D0-8340-0000F80270F8} |
| Deployment Cab | {3EA9E505-35AC-4774-B492-AD1749C4943A} |
| Deployment Merge Module | {06A35CCD-C46D-44D5-987B-CF40FF872267} |
| Deployment Setup | {978C614F-708E-4E1A-B201-565925725DBA} |
| Deployment Smart Device Cab | {AB322303-2255-48EF-A496-5904EB18DA55} |
| Distributed System | {F135691A-BF7E-435D-8960-F99683D2D49C} |
| Dynamics 2012 AX C# in AOT | {BF6F8E12-879D-49E7-ADF0-5503146B24B8} |
| F# | {F2A71F9B-5D33-465A-A702-920D77279786} |
| J# | {E6FDF86B-F3D1-11D4-8576-0002A516ECE8} |
| Legacy (2003) Smart Device (C#) | {20D4826A-C6FA-45DB-90F4-C717570B9F32} |
| Legacy (2003) Smart Device (VB.NET) | {CB4CE8C6-1BDB-4DC7-A4D3-65A1999772F8} |
| Micro Framework | {b69e3092-b931-443c-abe7-7e7b65f2a37f} |
| Model-View-Controller v2 (MVC 2) | {F85E285D-A4E0-4152-9332-AB1D724D3325} |
| Model-View-Controller v3 (MVC 3) | {E53F8FEA-EAE0-44A6-8774-FFD645390401} |
| Model-View-Controller v4 (MVC 4) | {E3E379DF-F4C6-4180-9B81-6769533ABE47} |
| Model-View-Controller v5 (MVC 5) | {349C5851-65DF-11DA-9384-00065B846F21} |
| Mono for Android | {EFBA0AD7-5A72-4C68-AF49-83D382785DCF} |
| MonoTouch | {6BC8ED88-2882-458C-8E55-DFD12B67127B} |
| MonoTouch Binding | {F5B4F3BC-B597-4E2B-B552-EF5D8A32436F} |
| Portable Class Library | {786C830F-07A1-408B-BD7F-6EE04809D6DB} |
| Project Folders | {66A26720-8FB5-11D2-AA7E-00C04F688DDE} |
| Service Fabric Application (.sfproj) | {A07B5EB6-E848-4116-A8D0-A826331D98C6} |
| SharePoint (C#) | {593B0543-81F6-4436-BA1E-4747859CAAE2} |
| SharePoint (VB.NET) | {EC05E597-79D4-47f3-ADA0-324C4F7C7484} |
| SharePoint Workflow | {F8810EC1-6754-47FC-A15F-DFABD2E3FA90} |
| Silverlight | {A1591282-1198-4647-A2B1-27E5FF5F6F3B} |
| Smart Device (C#) | {4D628B5B-2FBC-4AA6-8C16-197242AEB884} |
| Smart Device (VB.NET) | {68B1623D-7FB9-47D8-8664-7ECEA3297D4F} |
| Solution Folder | {2150E333-8FDC-42A3-9474-1A3956D46DE8} |
| Test | {3AC096D0-A1C2-E12C-1390-A8335801FDAB} |
| Universal Windows Class Library | {A5A43C5B-DE2A-4C0C-9213-0A381AF9435A} |
| VB.NET | {F184B08F-C81C-45F6-A57F-5ABD9991F28F} |
| Visual Database Tools | {C252FEB5-A946-4202-B1D4-9916A0590387} |
| Visual Studio 2015 Installer Project Extension | {54435603-DBB4-11D2-8724-00A0C9A8B90C} |
| Visual Studio Tools for Applications (VSTA) | {A860303F-1F3F-4691-B57E-529FC101A107} |
| Visual Studio Tools for Office (VSTO) | {BAA0C2D2-18E2-41B9-852F-F413020CAA33} |
| Web Application | {349C5851-65DF-11DA-9384-00065B846F21} |
| Web Site | {E24C65DC-7377-472B-9ABA-BC803B73C61A} |
| Windows (C#) | {FAE04EC0-301F-11D3-BF4B-00C04F79EFBC} |
| Windows (VB.NET) | {F184B08F-C81C-45F6-A57F-5ABD9991F28F} |
| Windows (Visual C++) | {8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942} |
| Windows Communication Foundation (WCF) | {3D9AD99F-2412-4246-B90B-4EAA41C64699} |
| Windows Phone 8/8.1 Blank/Hub/Webview App | {76F1466A-8B6D-4E39-A767-685A06062A39} |
| Windows Phone 8/8.1 App (C#) | {C089C8C0-30E0-4E22-80C0-CE093F111A43} |
| Windows Phone 8/8.1 App (VB.NET) | {DB03555F-0C8B-43BE-9FF9-57896B3C5E56} |
| Windows Presentation Foundation (WPF) | {60DC8134-EBA5-43B8-BCC9-BB4BC16C2548} |
| Windows Store (Metro) Apps & Components | {BC8A1FFA-BEE3-4634-8014-F334798102B3} |
| Workflow (C#) | {14822709-B5A1-4724-98CA-57A101D1B079} |
| Workflow (VB.NET) | {D59BE175-2ED0-4C54-BE3D-CDAA9F3214C8} |
| Workflow Foundation | {32F31D43-81CC-4C15-9DE6-3FC5453562B6} |
| Xamarin.Android | {EFBA0AD7-5A72-4C68-AF49-83D382785DCF} |
| Xamarin.iOS | {6BC8ED88-2882-458C-8E55-DFD12B67127B} |
| XNA (Windows) | {6D335F3A-9D43-41b4-9D22-F6F17C4BE596} |
| XNA (XBox) | {2DF5C3F4-5A5F-47a9-8E94-23B4456F55E2} |
| XNA (Zune) | {D399B71A-8929-442a-A9AC-8BEC78BB2433} |
+------------------------------------------------+----------------------------------------+
+------------------------------------------------+----------------------------------------+
| Project Type | GUID
+------------------------------------------------+----------------------------------------+
| Deployment Merge Module | {06A35CCD-C46D-44D5-987B-CF40FF872267} |
| Workflow (C#) | {14822709-B5A1-4724-98CA-57A101D1B079} |
| Legacy (2003) Smart Device (C#) | {20D4826A-C6FA-45DB-90F4-C717570B9F32} |
| Solution Folder | {2150E333-8FDC-42A3-9474-1A3956D46DE8} |
| XNA (XBox) | {2DF5C3F4-5A5F-47a9-8E94-23B4456F55E2} |
| Workflow Foundation | {32F31D43-81CC-4C15-9DE6-3FC5453562B6} |
| Web Application (incl. MVC 5) | {349C5851-65DF-11DA-9384-00065B846F21} |
| Test | {3AC096D0-A1C2-E12C-1390-A8335801FDAB} |
| Windows Communication Foundation (WCF) | {3D9AD99F-2412-4246-B90B-4EAA41C64699} |
| Deployment Cab | {3EA9E505-35AC-4774-B492-AD1749C4943A} |
| Smart Device (C#) | {4D628B5B-2FBC-4AA6-8C16-197242AEB884} |
| Database (other project types) | {4F174C21-8C12-11D0-8340-0000F80270F8} |
| Visual Studio 2015 Installer Project Extension | {54435603-DBB4-11D2-8724-00A0C9A8B90C} |
| SharePoint (C#) | {593B0543-81F6-4436-BA1E-4747859CAAE2} |
| ASP.NET MVC 1.0 | {603C0E0B-DB56-11DC-BE95-000D561079B0} |
| Windows Presentation Foundation (WPF) | {60DC8134-EBA5-43B8-BCC9-BB4BC16C2548} |
| Smart Device (VB.NET) | {68B1623D-7FB9-47D8-8664-7ECEA3297D4F} |
| Project Folders | {66A26720-8FB5-11D2-AA7E-00C04F688DDE} |
| MonoTouch | {6BC8ED88-2882-458C-8E55-DFD12B67127B} |
| XNA (Windows) | {6D335F3A-9D43-41b4-9D22-F6F17C4BE596} |
| Windows Phone 8/8.1 Blank/Hub/Webview App | {76F1466A-8B6D-4E39-A767-685A06062A39} |
| Portable Class Library | {786C830F-07A1-408B-BD7F-6EE04809D6DB} |
| ASP.NET 5 | {8BB2217D-0F2D-49D1-97BC-3654ED321F3B} |
| C++ | {8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942} |
| Deployment Setup | {978C614F-708E-4E1A-B201-565925725DBA} |
| .NET Core | {9A19103F-16F7-4668-BE54-9A1E7A4F7556} |
| Service Fabric Application (.sfproj) | {A07B5EB6-E848-4116-A8D0-A826331D98C6} |
| Silverlight | {A1591282-1198-4647-A2B1-27E5FF5F6F3B} |
| Universal Windows Class Library | {A5A43C5B-DE2A-4C0C-9213-0A381AF9435A} |
| Visual Studio Tools for Applications (VSTA) | {A860303F-1F3F-4691-B57E-529FC101A107} |
| Database | {A9ACE9BB-CECE-4E62-9AA4-C7E7C5BD2124} |
| Deployment Smart Device Cab | {AB322303-2255-48EF-A496-5904EB18DA55} |
| Micro Framework | {B69E3092-B931-443C-ABE7-7E7B65F2A37F} |
| Visual Studio Tools for Office (VSTO) | {BAA0C2D2-18E2-41B9-852F-F413020CAA33} |
| Windows Store Apps (Metro Apps) | {BC8A1FFA-BEE3-4634-8014-F334798102B3} |
| C# in Dynamics 2012 AX AOT | {BF6F8E12-879D-49E7-ADF0-5503146B24B8} |
| Windows Phone 8/8.1 App (C#) | {C089C8C0-30E0-4E22-80C0-CE093F111A43} |
| Visual Database Tools | {C252FEB5-A946-4202-B1D4-9916A0590387} |
| Legacy (2003) Smart Device (VB.NET) | {CB4CE8C6-1BDB-4DC7-A4D3-65A1999772F8} |
| XNA (Zune) | {D399B71A-8929-442a-A9AC-8BEC78BB2433} |
| Workflow (VB.NET) | {D59BE175-2ED0-4C54-BE3D-CDAA9F3214C8} |
| Windows Phone 8/8.1 App (VB.NET) | {DB03555F-0C8B-43BE-9FF9-57896B3C5E56} |
| Web Site | {E24C65DC-7377-472B-9ABA-BC803B73C61A} |
| ASP.NET MVC 4.0 | {E3E379DF-F4C6-4180-9B81-6769533ABE47} |
| ASP.NET MVC 3.0 | {E53F8FEA-EAE0-44A6-8774-FFD645390401} |
| J# | {E6FDF86B-F3D1-11D4-8576-0002A516ECE8} |
| SharePoint (VB.NET) | {EC05E597-79D4-47f3-ADA0-324C4F7C7484} |
| Xamarin.Android / Mono for Android | {EFBA0AD7-5A72-4C68-AF49-83D382785DCF} |
| Distributed System | {F135691A-BF7E-435D-8960-F99683D2D49C} |
| VB.NET | {F184B08F-C81C-45F6-A57F-5ABD9991F28F} |
| F# | {F2A71F9B-5D33-465A-A702-920D77279786} |
| MonoTouch Binding | {F5B4F3BC-B597-4E2B-B552-EF5D8A32436F} |
| ASP.NET MVC 2.0 | {F85E285D-A4E0-4152-9332-AB1D724D3325} |
| SharePoint Workflow | {F8810EC1-6754-47FC-A15F-DFABD2E3FA90} |
| C# | {FAE04EC0-301F-11D3-BF4B-00C04F79EFBC} |
+------------------------------------------------+----------------------------------------+
注意：您会发现这些属性是
<ProjectTypeGuids>项目文件中的一个元素，不要与<ProjectGuid>哪个是项目的唯一标识符相混淆。
一些 GUID 组合使用。例如，
<ProjectTypeGuids>{EFBA0AD7-5A72-4C68-AF49-83D382785DCF};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>用 C# 描述 Xamarin.Android 库。
我经常会复制一个 VS 项目文件，重命名它并搜索并替换所有出现的项目名称，以创建一个具有相同设置的新项目。这通常比创建一个新项目然后确保所有设置都正确更快。我忽略了 GUID。将项目添加到解决方案后，VS 将在我保存项目后立即更改 GUID。
我做了很多 DLL/C/C++ 开发，多年来我已经广泛偏离标准项目设置（特别是在优化、代码生成等方面），我发现复制技术是一种更快、更可靠的设置方法项目。
csproj 文件中的项目 guid 应该是唯一的。根据我的经验，如果两个 csproj 文件包含在同一个解决方案中，visual studio 会自动重新生成其中一个 guid。
明智的话：如果制作 XBOX360 XNA 4.0 项目并尝试这个技巧，不要使用 VS 2012 生成的 guid。在 VS2010 中生成一个并使用它。
或者，当您尝试在 XNA Game Studio Connect 中运行重新引导的项目时，您将收到以下错误。
“这个游戏丢失或损坏，等等，重新启动XNA Game Studio Connect？”
然后它会爆炸。VS 2010 指南工作正常。我不知道为什么。