diff --git a/Weasel.Setup/Program.cs b/Weasel.Setup/Program.cs
index 977f2ce2e..d17807501 100644
--- a/Weasel.Setup/Program.cs
+++ b/Weasel.Setup/Program.cs
@@ -58,7 +58,7 @@ private static void Run(string arg)
                 if (arg.StartsWith("/userdir:")) // 设置用户目录
                 {
                     var dir = arg.Substring(arg.IndexOf(':') + 1);
-                    if (!string.IsNullOrEmpty(arg))
+                    if (dir != null)
                     {
                         Utils.Reg.SetValue(Registry.CurrentUser, WEASEL_PROG_REG_KEY, "RimeUserDir", dir);
                     }
@@ -124,7 +124,7 @@ private static void Run(string arg)
             }
             catch (Exception ex)
             {
-                MessageBox.Show(Localization.Resources.STR_ERROR, ex.Message);
+                MessageBox.Show(ex.Message, Localization.Resources.STR_ERROR);
             }
         }
 
diff --git a/Weasel.Setup/Setup.cs b/Weasel.Setup/Setup.cs
index dc30f1e53..d5bfb6ac3 100644
--- a/Weasel.Setup/Setup.cs
+++ b/Weasel.Setup/Setup.cs
@@ -62,14 +62,8 @@ public static void NormalInstall(bool isHant, bool isSilentMode = true)
             Utils.Reg.SetValue(Registry.LocalMachine, WEASEL_PROG_REG_KEY, "ServerExecutable", WEASEL_SERVER_EXE);
 
             // 启用键盘布局和文本服务
-            if (isHant)
-            {
-                PInvoke.Input.InstallLayoutOrTip(PSZTITLE_HANT, 0);
-            }
-            else
-            {
-                PInvoke.Input.InstallLayoutOrTip(PSZTITLE_HANS, 0);
-            }
+            var psz = isHant ? PSZTITLE_HANT : PSZTITLE_HANS;
+            PInvoke.Input.InstallLayoutOrTip(psz, 0);
 
             // 收集用户模式转储
             // https://learn.microsoft.com/zh-cn/windows/win32/wer/collecting-user-mode-dumps
@@ -94,14 +88,8 @@ public static void Uninstall(bool isSilentMode)
             var isHant = Convert.ToBoolean(
                 Utils.Reg.GetValue(Registry.CurrentUser, WEASEL_PROG_REG_KEY, "Hant", 0)
             );
-            if (isHant)
-            {
-                PInvoke.Input.InstallLayoutOrTip(PSZTITLE_HANT, PInvoke.Input.ILOT.ILOT_UNINSTALL);
-            }
-            else
-            {
-                PInvoke.Input.InstallLayoutOrTip(PSZTITLE_HANS, PInvoke.Input.ILOT.ILOT_UNINSTALL);
-            }
+            var psz = isHant ? PSZTITLE_HANT : PSZTITLE_HANS;
+            PInvoke.Input.InstallLayoutOrTip(psz, PInvoke.Input.ILOT.ILOT_UNINSTALL);
 
             UninstallImeFiles("weasel.dll", (imePath) =>
             {
@@ -186,7 +174,8 @@ private static void InstallImeFiles(string srcPath, Action<string> updateService
             }
             else
             {
-                if (File.Exists(srcPath)) {
+                if (File.Exists(srcPath))
+                {
                     File.Copy(srcPath, destPath, true);
                     updateService(destPath);
                 }
@@ -247,16 +236,10 @@ private static void UpdateServiceState(string libPath, bool enable, bool isHant)
             if (!enable) UpdateProfile(false, isHant);
             var value = isHant ? "hant" : "hans";
             Environment.SetEnvironmentVariable("TEXTSERVICE_PROFILE", value);
-            string regsvr32Path;
             var sysarm32Dir = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Windows), "SysArm32");
-            if (Directory.Exists(sysarm32Dir))
-            {
-                regsvr32Path = Path.Combine(sysarm32Dir, "regsvr32.exe");
-            }
-            else
-            {
-                regsvr32Path = "regsvr32.exe";
-            }
+            var regsvr32Path = Directory.Exists(sysarm32Dir) 
+                ? Path.Combine(sysarm32Dir, "regsvr32.exe") 
+                : "regsvr32.exe";
             var args = enable ? $"/s \"{libPath}\"" : $"/s /u \"{libPath}\"";
             var updateInfo = new ProcessStartInfo
             {
diff --git a/Weasel.Setup/SetupOptionDialog.cs b/Weasel.Setup/SetupOptionDialog.cs
index d6932299d..5d829a46e 100644
--- a/Weasel.Setup/SetupOptionDialog.cs
+++ b/Weasel.Setup/SetupOptionDialog.cs
@@ -26,7 +26,8 @@ private void InstallOptionDialog_Load(object sender, System.EventArgs e)
             selectButton.Enabled = !string.IsNullOrEmpty(UserDir);
             customPathBox.Text = UserDir;
 
-            if (IsInstalled) {
+            if (IsInstalled)
+            {
                 confirmButton.Text = Localization.Resources.STR_OK;
             }
             removeButton.Enabled = IsInstalled;
@@ -38,7 +39,7 @@ private void DefaultFolderRadio_CheckedChanged(object sender, System.EventArgs e
             {
                 customPathBox.Text = string.Empty;
                 customPathBox.Enabled = false;
-                selectButton.Enabled= false;
+                selectButton.Enabled = false;
             }
         }
 
@@ -54,13 +55,9 @@ private void CustomFolderRadio_CheckedChanged(object sender, System.EventArgs e)
         private void ConfirmButton_Click(object sender, System.EventArgs e)
         {
             IsHant = chtRadio.Checked;
-            if (customFolderRadio.Checked)
-            {
-                UserDir = customPathBox.Text;
-            } else
-            {
-                UserDir = string.Empty;
-            }
+            UserDir = customFolderRadio.Checked
+                ? customPathBox.Text
+                : string.Empty;
             DialogResult = DialogResult.OK;
             Close();
         }