diff --git a/dotnet/README.md b/dotnet/README.md
new file mode 100644
index 0000000..02ea4ab
--- /dev/null
+++ b/dotnet/README.md
@@ -0,0 +1,29 @@
+# dotnet
+
+读取本机 .NET Framework 安装信息（Windows 注册表）：v2/v3/v3.5/v4 各版本
+安装状态与版本号，以及 4.5+ 的 release key 换算。
+
+> 迁移自 go-hua/netFramework 并更名：原包名 `netFramework` 极易误读为
+> "网络框架"，实为 .NET Framework 信息查询，故更名 `dotnet`。
+> **仅 Windows 可用**（读注册表）。
+
+## 用法
+
+```go
+import "git.zeroonesoft.cn/golib/zogo/dotnet"
+
+v2, err := dotnet.GetV2Info()   // {Install, Version, ServicePack}
+v3, err := dotnet.GetV3Info()
+v35, err := dotnet.GetV35Info()
+v4, err := dotnet.GetV4Info()   // {Install, Release, Version}
+
+// release key → "4.8" 之类的展示版本
+name := dotnet.CheckFor45PlusVersion(releaseKey)
+```
+
+完整可运行例程：[examples/dotnet/main.go](../examples/dotnet/main.go)
+
+## 注意
+
+- 非 Windows 平台调用返回错误（构建不隔离，运行时区分）。
+- .NET 5+ 不再写 .NET Framework 的注册表键，本包只覆盖 Framework 系。
diff --git a/dotnet/dotnet.go b/dotnet/dotnet.go
new file mode 100644
index 0000000..cb234a7
--- /dev/null
+++ b/dotnet/dotnet.go
@@ -0,0 +1,180 @@
+// Package dotnet 读取本机 .NET Framework 安装信息（Windows 注册表）。
+package dotnet
+
+import "golang.org/x/sys/windows/registry"
+
+const (
+	V45MinValue  = 378389
+	V451MinValue = 378675
+	V452MinValue = 379893
+	V46MinValue  = 393295
+	V461MinValue = 394254
+	V462MinValue = 394802
+	V47MinValue  = 460798
+	V471MinValue = 461308
+	V472MinValue = 461808
+	V48MinValue  = 528040
+	V481MinValue = 533320
+)
+
+// V2Info .NET Framework 2.0 安装信息
+type V2Info struct {
+	Install uint64
+	Version string
+}
+
+// V3Info .NET Framework 3.0 安装信息
+type V3Info struct {
+	Install uint64
+	Version string
+}
+
+// V35Info .NET Framework 3.5 安装信息
+type V35Info struct {
+	Install     uint64
+	InstallPath string
+	Version     string
+}
+
+// V4Info .NET Framework 4.x 安装信息
+type V4Info struct {
+	Install     uint64
+	InstallPath string
+	Release     uint64
+	Version     string
+}
+
+// GetV2Info 获取 .NET Framework 2.0 安装信息
+func GetV2Info() (V2Info, error) {
+	key, err := registry.OpenKey(registry.LOCAL_MACHINE, "SOFTWARE\\Microsoft\\NET Framework Setup\\NDP\\v2.0.50727", registry.READ)
+	info := V2Info{}
+	if err != nil {
+		return info, err
+	}
+	install, _, err := key.GetIntegerValue("Install")
+	if err != nil {
+		return info, err
+	}
+	version, _, err := key.GetStringValue("Version")
+	if err != nil {
+		return info, err
+	}
+	info.Install = install
+	info.Version = version
+	return info, nil
+}
+
+// GetV3Info 获取 .NET Framework 3.0 安装信息
+func GetV3Info() (V3Info, error) {
+	key, err := registry.OpenKey(registry.LOCAL_MACHINE, "SOFTWARE\\Microsoft\\NET Framework Setup\\NDP\\v3.0\\Setup", registry.READ)
+	info := V3Info{}
+	if err != nil {
+		return info, err
+	}
+	install, _, err := key.GetIntegerValue("InstallSuccess")
+	if err != nil {
+		return info, err
+	}
+	version, _, err := key.GetStringValue("Version")
+	if err != nil {
+		return info, err
+	}
+	info.Install = install
+	info.Version = version
+	return info, nil
+}
+
+// GetV35Info 获取 .NET Framework 3.5 安装信息
+func GetV35Info() (V35Info, error) {
+	key, err := registry.OpenKey(registry.LOCAL_MACHINE, "SOFTWARE\\Microsoft\\NET Framework Setup\\NDP\\v3.5", registry.READ)
+	info := V35Info{}
+	if err != nil {
+		return info, err
+	}
+	install, _, err := key.GetIntegerValue("Install")
+	if err != nil {
+		return info, err
+	}
+	installPath, _, err := key.GetStringValue("InstallPath")
+	if err != nil {
+		return info, err
+	}
+	version, _, err := key.GetStringValue("Version")
+	if err != nil {
+		return info, err
+	}
+	info.Install = install
+	info.InstallPath = installPath
+	info.Version = version
+	return info, nil
+}
+
+// GetV4Info 获取 .NET Framework 4.x 安装信息
+func GetV4Info() (V4Info, error) {
+	key, err := registry.OpenKey(registry.LOCAL_MACHINE, "SOFTWARE\\Microsoft\\NET Framework Setup\\NDP\\v4\\Full", registry.READ)
+	info := V4Info{}
+	if err != nil {
+		return info, err
+	}
+	install, _, err := key.GetIntegerValue("Install")
+	if err != nil {
+		return info, err
+	}
+	installPath, _, err := key.GetStringValue("InstallPath")
+	if err != nil {
+		return info, err
+	}
+	release, _, err := key.GetIntegerValue("Release")
+	if err != nil {
+		return info, err
+	}
+	version, _, err := key.GetStringValue("Version")
+	if err != nil {
+		return info, err
+	}
+	info.Install = install
+	info.InstallPath = installPath
+	info.Release = release
+	info.Version = version
+	return info, nil
+}
+
+// CheckFor45PlusVersion 根据 Release 注册表值判断 .NET Framework 4.5+ 的具体版本
+func CheckFor45PlusVersion(releaseKey int) string {
+	if releaseKey >= 533320 {
+		return "4.8.1 or later"
+	}
+	if releaseKey >= 528040 {
+		return "4.8"
+	}
+	if releaseKey >= 461808 {
+		return "4.7.2"
+	}
+	if releaseKey >= 461308 {
+		return "4.7.1"
+	}
+	if releaseKey >= 460798 {
+		return "4.7"
+	}
+	if releaseKey >= 394802 {
+		return "4.6.2"
+	}
+	if releaseKey >= 394254 {
+		return "4.6.1"
+	}
+	if releaseKey >= 393295 {
+		return "4.6"
+	}
+	if releaseKey >= 379893 {
+		return "4.5.2"
+	}
+	if releaseKey >= 378675 {
+		return "4.5.1"
+	}
+	if releaseKey >= 378389 {
+		return "4.5"
+	}
+	// This code should never execute. A non-null release key should mean
+	// 安装4.5或更高版本。
+	return "No 4.5 or later version detected"
+}
diff --git a/dotnet/dotnet_test.go b/dotnet/dotnet_test.go
new file mode 100644
index 0000000..fed06d9
--- /dev/null
+++ b/dotnet/dotnet_test.go
@@ -0,0 +1,31 @@
+package dotnet
+
+import "testing"
+
+func TestCheckFor45PlusVersion(t *testing.T) {
+	cases := []struct {
+		release int
+		want    string
+	}{
+		{533320, "4.8.1 or later"},
+		{533325, "4.8.1 or later"},
+		{528040, "4.8"},
+		{528049, "4.8"},
+		{461808, "4.7.2"},
+		{461308, "4.7.1"},
+		{460798, "4.7"},
+		{394802, "4.6.2"},
+		{394254, "4.6.1"},
+		{393295, "4.6"},
+		{379893, "4.5.2"},
+		{378675, "4.5.1"},
+		{378389, "4.5"},
+		{100000, "No 4.5 or later version detected"},
+		{0, "No 4.5 or later version detected"},
+	}
+	for _, c := range cases {
+		if got := CheckFor45PlusVersion(c.release); got != c.want {
+			t.Errorf("CheckFor45PlusVersion(%d) = %q, want %q", c.release, got, c.want)
+		}
+	}
+}
diff --git a/examples/dotnet/main.go b/examples/dotnet/main.go
new file mode 100644
index 0000000..2baa13d
--- /dev/null
+++ b/examples/dotnet/main.go
@@ -0,0 +1,26 @@
+// dotnet 包示例：读取本机 .NET Framework 安装信息（Windows 注册表）
+package main
+
+import (
+	"fmt"
+
+	"git.zeroonesoft.cn/golib/zogo/dotnet"
+)
+
+func main() {
+	// .NET Framework 4.x（读取 Release 注册表值）
+	if v4, err := dotnet.GetV4Info(); err != nil {
+		fmt.Println("未检测到 .NET Framework 4.x:", err)
+	} else {
+		fmt.Printf(".NET 4.x: Install=%d Version=%s Release=%d\n", v4.Install, v4.Version, v4.Release)
+		fmt.Println("4.5+ 版本判定:", dotnet.CheckFor45PlusVersion(int(v4.Release)))
+	}
+
+	// 旧版本信息
+	if v2, err := dotnet.GetV2Info(); err == nil {
+		fmt.Printf(".NET 2.0: Install=%d Version=%s\n", v2.Install, v2.Version)
+	}
+	if v35, err := dotnet.GetV35Info(); err == nil {
+		fmt.Printf(".NET 3.5: Install=%d Version=%s\n", v35.Install, v35.Version)
+	}
+}