Error log the invalid the target name

src/MSBuild.UnitTests/CommandLineSwitches_Tests.cs

@@ -1369,6 +1369,26 @@ public void ProcessGraphBuildSwitch(string[] parameters, GraphBuildOptions expec
             }
         }
 
+        /// <summary>
+        /// Verifies that the /target switch is parsed properly with invalid characters.
+        /// </summary>
+        [Fact]
+        public void ProcessInvalidTargetSwitch()
+        {
+            string projectContent = """
+                <Project>
+                </Project>
+                """;
+            using TestEnvironment testEnvironment = TestEnvironment.Create();
+            string project = testEnvironment.CreateTestProjectWithFiles("project.proj", projectContent).ProjectFile;
+
+#if FEATURE_GET_COMMANDLINE
+            MSBuildApp.Execute(@"msbuild.exe " + project + " /t:foo.bar").ShouldBe(MSBuildApp.ExitType.SwitchError);
+#else
+            MSBuildApp.Execute(new[] { @"msbuild.exe", project, "/t:foo.bar" }).ShouldBe(MSBuildApp.ExitType.SwitchError);
+#endif
+        }
+
         /// <summary>
         /// Verifies that when the /profileevaluation switch is used with invalid filenames an error is shown.
         /// </summary>

src/MSBuild/MSBuild.csproj

@@ -103,6 +103,9 @@
     <Compile Include="..\Shared\Modifiers.cs">
       <ExcludeFromStyleCop>true</ExcludeFromStyleCop>
     </Compile>
+    <Compile Include="..\Shared\XMakeElements.cs">
+      <ExcludeFromStyleCop>true</ExcludeFromStyleCop>
+    </Compile>
     <Compile Include="..\Shared\BufferedReadStream.cs" />
     <Compile Include="..\Shared\CopyOnWriteDictionary.cs" />
     <Compile Include="..\Shared\IKeyed.cs" />

src/MSBuild/Resources/Strings.resx

@@ -1379,6 +1379,12 @@
   <data name="UnsupportedSwitchForSolutionFiles" Visibility="Public">
     <value>The '{0}' switch is not supported for solution files.</value>
   </data>
+  <data name="NameInvalid" Visibility="Public">
+    <value>MSBUILD: error MSB5016: The name "{0}" contains an invalid character "{1}".</value>
+    <comment>
+      {StrBegin="MSBUILD : error MSB5016: "}
+    </comment>
+  </data>
   <!-- **** TerminalLogger strings begin **** -->
   <data name="RestoreComplete" xml:space="preserve">
     <value>Restore complete ({0}s)</value>
@@ -1482,7 +1488,6 @@
     </comment>
   </data>
   <!-- **** TerminalLogger strings end **** -->
-
     <!--
         The command line message bucket is: MSB1001 - MSB1999
 

src/MSBuild/XMake.cs

@@ -3266,6 +3266,14 @@ internal static int GetLengthOfSwitchIndicator(string unquotedSwitch)
         /// <returns>List of target names.</returns>
         private static string[] ProcessTargetSwitch(string[] parameters)
         {
+            foreach (string parameter in parameters)
+            {
+                int indexOfSpecialCharacter = parameter.IndexOfAny(XMakeElements.InvalidTargetNameCharacters);
+                if (indexOfSpecialCharacter >= 0)
+                {
+                    CommandLineSwitchException.Throw("NameInvalid", nameof(XMakeElements.target), parameter, parameter[indexOfSpecialCharacter].ToString());
+                }
+            }
             return parameters;
         }