在 Windows 10 和 Windows 11 中，.NET Framework 3.5（包含 .NET 2.0 和 3.0）并非默认启用。虽然微软提供了从 Windows Update 在线安装的选项，但在企业内网环境、网络受限或 Windows Update 服务异常的情况下，下载往往会卡住或报错。此时， microsoft-windows-netfx3-ondemand-package.cab 作为官方离线包的基石，通过正确的 DISM 命令进行注入，就成了最稳定、最快速的解决方案。
Or use the built-in source option:
Right-click the install_netfx3.bat file and select .
It contains the necessary files to enable .NET Framework 3.5 (which includes .NET 2.0 and 3.0) on Windows 10/11 and Windows Server. Microsoft-windows-netfx3-ondemand-package.cab Download
To install .NET Framework 3.5 using this .cab file, use the tool in a Command Prompt with administrator privileges. Method 1: Direct File Path Where to find microsoft-windows-netfx3-ondemand-package.cab
Complete Guide to Downloading and Installing Microsoft-Windows-NetFx3-OnDemand-Package.cab
Windows modern operating systems include this package as a "Feature on Demand" (FOD). However, the source files are not pre-installed on your local drive to save disk space. Instead, Windows usually downloads them via Windows Update when prompted. When Windows Update is blocked, corrupted, or offline, the standalone .cab file serves as the definitive manual workaround. Why Use the CAB Package Method? 在 Windows 10 和 Windows 11 中，
dism /online /add-package /packagepath:"D:\sources\sxs\microsoft-windows-netfx3-ondemand-package.cab"
, as the file could be tampered with to include malware or ransomware.
DISM /Online /Add-Package /PackagePath:"C:\Path\To\Your\File\Microsoft-Windows-NetFx3-OnDemand-Package.cab" Method 1: Direct File Path Where to find
当排除了上述所有可能后，可以尝试卸载所有非英语的语言包（Language Packs），或在“Windows 功能”中暂时关闭高级功能后再次尝试安装，以排除依赖冲突。
dism /online /add-package /packagepath:D:\sources\sxs\microsoft-windows-netfx3-ondemand-package.cab
Before attempting to download or install the CAB file, ensure you have the following: