http://support.microsoft.comPRB: "VC Package Not Available or Not Registered" Error Message 适用于 This article was previously published under Q320427 SYMPTOMSWhen you create a WinForms application, you may receive the following error message: "VC Package not available or not registered" This behavior can occur even after what appears to be a successful installation. CAUSEThis behavior seems to occur because the Windows Installer does not register TLBs and DLLs if the installer finds that these items already exist. In most cases, a previous version of Visual Studio .NET causes this behavior, even if the previous installation was under a different operating system. RESOLUTIONTo resolve the problem, run the Visual Studio .NET repair. A repair is more effective for fixing this issue because the repair process forces registration of items that are not re-registered during an install. To run the repair, follow these steps: On the Start menu, point to Settings, click Control Panel, and then click Add/Remove Programs. On the list of installed programs, click Visual Studio .NET, and then click Change. Click the second item in the 1 2 3 Visual Studio Setup dialog box. Click Repair/Re-install, and then follow the onscreen instructions.
.net的类库不需要注册就能用的
一般把它放到bin文件夹里
使用的时候引入它的命名空间就可以使用了
新增类的时候也不行
说不能运行什么向导
regsvr32 <VisualStudioInstallDir>\vc7\vcpackages\csproj.dll
这个命令解决的，你可以试试，或者看一下这个帖子： http://www.csharpfriends.com/Forums/ShowPost.aspx?PostID=614
适用于
This article was previously published under Q320427
SYMPTOMSWhen you create a WinForms application, you may receive the following error message: "VC Package not available or not registered"
This behavior can occur even after what appears to be a successful installation.
CAUSEThis behavior seems to occur because the Windows Installer does not register TLBs and DLLs if the installer finds that these items already exist. In most cases, a previous version of Visual Studio .NET causes this behavior, even if the previous installation was under a different operating system.
RESOLUTIONTo resolve the problem, run the Visual Studio .NET repair. A repair is more effective for fixing this issue because the repair process forces registration of items that are not re-registered during an install. To run the repair, follow these steps:
On the Start menu, point to Settings, click Control Panel, and then click Add/Remove Programs.
On the list of installed programs, click Visual Studio .NET, and then click Change.
Click the second item in the 1 2 3 Visual Studio Setup dialog box.
Click Repair/Re-install, and then follow the onscreen instructions.