Mark -NoTypeInformation as obsolete no-op and evaluate -IncludeTypeInformation on by value on Csv cmdlets (#26719)

src/Microsoft.PowerShell.Commands.Utility/commands/utility/CsvCommands.cs

@@ -45,17 +45,19 @@ namespace Microsoft.PowerShell.Commands
         public abstract PSObject InputObject { get; set; }
 
         /// <summary>
-        /// IncludeTypeInformation : The #TYPE line should be generated. Default is false. Cannot specify with NoTypeInformation.
+        /// IncludeTypeInformation : The #TYPE line should be generated. Default is false.
         /// </summary>
         [Parameter]
         [Alias("ITI")]
         public SwitchParameter IncludeTypeInformation { get; set; }
 
         /// <summary>
-        /// NoTypeInformation : The #TYPE line should not be generated. Default is true. Cannot specify with IncludeTypeInformation.
+        /// Gets or sets a value indicating whether to suppress the #TYPE line.
+        /// This parameter is obsolete and has no effect. It is retained for backward compatibility only.
         /// </summary>
         [Parameter(DontShow = true)]
         [Alias("NTI")]
+        [Obsolete("This parameter is obsolete and has no effect. The default behavior is to not include type information. Use -IncludeTypeInformation to include type information.")]
         public SwitchParameter NoTypeInformation { get; set; } = true;
 
         /// <summary>
@@ -120,18 +122,6 @@ namespace Microsoft.PowerShell.Commands
                 this.ThrowTerminatingError(errorRecord);
             }
 
-            if (this.MyInvocation.BoundParameters.ContainsKey(nameof(IncludeTypeInformation)) && this.MyInvocation.BoundParameters.ContainsKey(nameof(NoTypeInformation)))
-            {
-                InvalidOperationException exception = new(CsvCommandStrings.CannotSpecifyIncludeTypeInformationAndNoTypeInformation);
-                ErrorRecord errorRecord = new(exception, "CannotSpecifyIncludeTypeInformationAndNoTypeInformation", ErrorCategory.InvalidData, null);
-                this.ThrowTerminatingError(errorRecord);
-            }
-
-            if (this.MyInvocation.BoundParameters.ContainsKey(nameof(IncludeTypeInformation)))
-            {
-                NoTypeInformation = !IncludeTypeInformation;
-            }
-
             Delimiter = ImportExportCSVHelper.SetDelimiter(this, ParameterSetName, Delimiter, UseCulture);
         }
     }
@@ -317,7 +307,7 @@ namespace Microsoft.PowerShell.Commands
                 // write headers (row1: typename + row2: column names)
                 if (!_isActuallyAppending && !NoHeader.IsPresent)
                 {
-                    if (NoTypeInformation == false)
+                    if (IncludeTypeInformation)
                     {
                         WriteCsvLine(ExportCsvHelper.GetTypeString(InputObject));
                     }
@@ -742,7 +732,7 @@ namespace Microsoft.PowerShell.Commands
 
                 if (!NoHeader.IsPresent)
                 {
-                    if (NoTypeInformation == false)
+                    if (IncludeTypeInformation)
                     {
                         WriteCsvLine(ExportCsvHelper.GetTypeString(InputObject));
                     }

src/Microsoft.PowerShell.Commands.Utility/resources/CsvCommandStrings.resx

@@ -130,9 +130,6 @@
   <data name="CannotSpecifyQuoteFieldsAndUseQuotes" xml:space="preserve">
     <value>You must specify either the -UseQuotes or -QuoteFields parameters, but not both.</value>
   </data>
-  <data name="CannotSpecifyIncludeTypeInformationAndNoTypeInformation" xml:space="preserve">
-    <value>You must specify either the -IncludeTypeInformation or -NoTypeInformation parameters, but not both.</value>
-  </data>
   <data name="CannotSpecifyPathAndLiteralPath" xml:space="preserve">
     <value>You must specify either the -Path or -LiteralPath parameters, but not both.</value>
   </data>

test/powershell/Modules/Microsoft.PowerShell.Utility/ConvertTo-Csv.Tests.ps1

@@ -101,11 +101,6 @@ Describe "ConvertTo-Csv" -Tags "CI" {
             Should -Throw -ErrorId "CannotSpecifyQuoteFieldsAndUseQuotes,Microsoft.PowerShell.Commands.ConvertToCsvCommand"
     }
 
-    It "Does not support -IncludeTypeInformation and -NoTypeInformation at the same time" {
-        { $testObject | ConvertTo-Csv -IncludeTypeInformation -NoTypeInformation } |
-            Should -Throw -ErrorId "CannotSpecifyIncludeTypeInformationAndNoTypeInformation,Microsoft.PowerShell.Commands.ConvertToCsvCommand"
-    }
-
     Context "QuoteFields parameter" {
         It "QuoteFields" {
             # Use 'FiRstCoLumn' to test case insensitivity

test/powershell/Modules/Microsoft.PowerShell.Utility/Export-Csv.Tests.ps1

@@ -91,11 +91,6 @@ Describe "Export-Csv" -Tags "CI" {
         $results[0] | Should -BeExactly "#TYPE System.String"
     }
 
-    It "Does not support -IncludeTypeInformation and -NoTypeInformation at the same time" {
-        { $testObject | Export-Csv -Path $testCsv -IncludeTypeInformation -NoTypeInformation } |
-            Should -Throw -ErrorId "CannotSpecifyIncludeTypeInformationAndNoTypeInformation,Microsoft.PowerShell.Commands.ExportCsvCommand"
-    }
-
     It "Should support -LiteralPath parameter" {
         $testObject | Export-Csv -LiteralPath $testCsv
         $results = Import-Csv -Path  $testCsv