lsmlhi_25 (FOWEPJF255) · Oct 16, 2026
@@ -5755,7 +5755,7 @@ protected override object PropertyGet(PSProperty property)
         protected override void PropertySet(PSProperty property, object setValue, bool convertIfPossible)
         {
             DataRow dataRow = (DataRow)property.baseObject;
-            dataRow[(string)property.adapterData] = setValue;
+            dataRow[(string)property.adapterData] = PSObject.Base(setValue);
             return;
         }
         #endregion virtual
@@ -5878,7 +5878,7 @@ protected override object PropertyGet(PSProperty property)
         protected override void PropertySet(PSProperty property, object setValue, bool convertIfPossible)
         {
             DataRowView dataRowView = (DataRowView)property.baseObject;
-            dataRowView[(string)property.adapterData] = setValue;
+            dataRowView[(string)property.adapterData] = PSObject.Base(setValue);
             return;
         }
         #endregion virtual

@@ -4687,14 +4687,24 @@ private DynamicMetaObject InvokeIndexer(
             }
 
             Expression[] indexExprs = new Expression[paramLength];
+            // DataRow and DataRowView indexers accept object values but validate them against their column type.
+            // Unwrap PowerShell's wrapper so their internal type checks see the underlying .NET value.
+            bool unwrapValue = setter.DeclaringType == typeof(DataRow) || setter.DeclaringType == typeof(DataRowView);
             for (int i = 0; i < paramLength; ++i)
             {
                 var parameterType = setterParams[i].ParameterType;
                 var argument = (i == paramLength - 1) ? value : indexes[i];
 
-                indexExprs[i] = parameterType.IsByRefLike
-                    ? PSConvertBinder.ConvertToByRefLikeTypeViaCasting(argument, parameterType)
-                    : PSGetIndexBinder.ConvertIndex(argument, parameterType);
+                if (unwrapValue && i == paramLength - 1 && parameterType == typeof(object) && argument.LimitType == typeof(PSObject))
+                {
+                    indexExprs[i] = Expression.Call(CachedReflectionInfo.PSObject_Base, argument.Expression.Cast(typeof(PSObject)));
+                }
+                else
+                {
+                    indexExprs[i] = parameterType.IsByRefLike
+                        ? PSConvertBinder.ConvertToByRefLikeTypeViaCasting(argument, parameterType)
+                        : PSGetIndexBinder.ConvertIndex(argument, parameterType);
+                }
 
                 if (indexExprs[i] == null)
                 {

@@ -329,6 +329,20 @@ Describe "DataRow and DataRowView Adapter tests" -tags "CI" {
             $row.LastName | Should -Be "soe"
             $row.YearsInMS | Should -Be 5
         }
+
+        It "Should set DateTime columns from PSObject values through properties and indexers" {
+            $table = [System.Data.DataTable]::new()
+            $null = $table.Columns.Add("Date", [DateTime])
+            $row = $table.Rows.Add((Get-Date))
+
+            $date = Get-Date
+            $row.Date = $date
+            $row.Date.Ticks | Should -Be $date.Ticks
+
+            $date = Get-Date
+            $row["Date"] = $date
+            $row.Date.Ticks | Should -Be $date.Ticks
+        }
     }
 
     Context "DataRowView Adapter tests" {
@@ -348,6 +362,21 @@ Describe "DataRow and DataRowView Adapter tests" -tags "CI" {
             $rowView.LastName | Should -Be "bush"
             $rowView.YearsInMS | Should -Be 9
         }
+
+        It "Should set DateTime columns from PSObject values through properties and indexers" {
+            $table = [System.Data.DataTable]::new()
+            $null = $table.Columns.Add("Date", [DateTime])
+            $null = $table.Rows.Add((Get-Date))
+            $rowView = [System.Data.DataView]::new($table)[0]
+
+            $date = Get-Date
+            $rowView.Date = $date
+            $rowView.Date.Ticks | Should -Be $date.Ticks
+
+            $date = Get-Date
+            $rowView["Date"] = $date
+            $rowView.Date.Ticks | Should -Be $date.Ticks
+        }
     }
 }