dotnet · JamesNK · Dec 16, 2025 · Dec 16, 2025 · Dec 16, 2025 · Dec 17, 2025
diff --git a/src/Aspire.Hosting/ApplicationModel/KnownResourceCommands.cs b/src/Aspire.Hosting/ApplicationModel/KnownResourceCommands.cs
@@ -24,4 +24,9 @@ public static class KnownResourceCommands
     /// The command name for restarting a resource.
     /// </summary>
     public static readonly string RestartCommand = "resource-restart";
+
+    /// <summary>
+    /// The command name for setting a parameter value.
+    /// </summary>
+    public static readonly string SetParameterCommand = "parameter-set";
 }
diff --git a/src/Aspire.Hosting/ApplicationModel/ParameterResource.cs b/src/Aspire.Hosting/ApplicationModel/ParameterResource.cs
@@ -40,7 +40,19 @@ public ParameterResource(string name, Func<ParameterDefault?, string> callback,
     [Obsolete("Use GetValueAsync for async access or pass the ParameterResource directly to methods that accept it (e.g., environment variables).")]
     public string Value => GetValueAsync(default).AsTask().GetAwaiter().GetResult()!;
 
-    internal string ValueInternal => _lazyValue.Value;
+    internal string ValueInternal
+    {
+        get
+        {
+            // If the WaitForValueTcs has a set value then prefer it.
+            if (WaitForValueTcs?.Task is { IsCompletedSuccessfully: true } valueTask)
+            {
+                return valueTask.Result;
+            }
+
+            return _lazyValue.Value;
+        }
+    }
 
     /// <summary>
     /// Represents how the default value of the parameter should be retrieved.

diff --git a/src/Aspire.Hosting/Orchestrator/ParameterProcessor.cs b/src/Aspire.Hosting/Orchestrator/ParameterProcessor.cs
diff --git a/src/Aspire.Hosting/Resources/CommandStrings.Designer.cs b/src/Aspire.Hosting/Resources/CommandStrings.Designer.cs
diff --git a/src/Aspire.Hosting/Resources/CommandStrings.resx b/src/Aspire.Hosting/Resources/CommandStrings.resx
@@ -135,4 +135,10 @@
   <data name="StopName" xml:space="preserve">
     <value>Stop</value>
   </data>
+  <data name="SetParameterDescription" xml:space="preserve">
+    <value>Set parameter value</value>
+  </data>
+  <data name="SetParameterName" xml:space="preserve">
+    <value>Set parameter</value>
+  </data>
 </root>
diff --git a/src/Aspire.Hosting/Resources/InteractionStrings.Designer.cs b/src/Aspire.Hosting/Resources/InteractionStrings.Designer.cs
diff --git a/src/Aspire.Hosting/Resources/InteractionStrings.resx b/src/Aspire.Hosting/Resources/InteractionStrings.resx
@@ -181,4 +181,13 @@
   <data name="ContainerRuntimeNotInstalledMessage" xml:space="preserve">
     <value>Container runtime could not be found. See https://aka.ms/dotnet/aspire/containers for more details on supported container runtimes.</value>
   </data>
-</root>
+  <data name="SetParameterTitle" xml:space="preserve">
+    <value>Set parameter</value>
+  </data>
+  <data name="SetParameterMessage" xml:space="preserve">
+    <value>Please provide a value for the parameter. The parameter can be saved to [user secrets](https://learn.microsoft.com/aspnet/core/security/app-secrets) for future use.
+
+New parameter values may not be used until dependent resources are restarted.</value>
+    <comment>Contains markdown</comment>
+  </data>
+</root>
diff --git a/src/Aspire.Hosting/Resources/xlf/CommandStrings.cs.xlf b/src/Aspire.Hosting/Resources/xlf/CommandStrings.cs.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/CommandStrings.de.xlf b/src/Aspire.Hosting/Resources/xlf/CommandStrings.de.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/CommandStrings.es.xlf b/src/Aspire.Hosting/Resources/xlf/CommandStrings.es.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/CommandStrings.fr.xlf b/src/Aspire.Hosting/Resources/xlf/CommandStrings.fr.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/CommandStrings.it.xlf b/src/Aspire.Hosting/Resources/xlf/CommandStrings.it.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/CommandStrings.ja.xlf b/src/Aspire.Hosting/Resources/xlf/CommandStrings.ja.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/CommandStrings.ko.xlf b/src/Aspire.Hosting/Resources/xlf/CommandStrings.ko.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/CommandStrings.pl.xlf b/src/Aspire.Hosting/Resources/xlf/CommandStrings.pl.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/CommandStrings.pt-BR.xlf b/src/Aspire.Hosting/Resources/xlf/CommandStrings.pt-BR.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/CommandStrings.ru.xlf b/src/Aspire.Hosting/Resources/xlf/CommandStrings.ru.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/CommandStrings.tr.xlf b/src/Aspire.Hosting/Resources/xlf/CommandStrings.tr.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/CommandStrings.zh-Hans.xlf b/src/Aspire.Hosting/Resources/xlf/CommandStrings.zh-Hans.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/CommandStrings.zh-Hant.xlf b/src/Aspire.Hosting/Resources/xlf/CommandStrings.zh-Hant.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/InteractionStrings.cs.xlf b/src/Aspire.Hosting/Resources/xlf/InteractionStrings.cs.xlf
diff --git a/src/Aspire.Hosting/Resources/xlf/InteractionStrings.de.xlf b/src/Aspire.Hosting/Resources/xlf/InteractionStrings.de.xlf