It it now possible to create/edit item contents

Toolkit.Foundation/DecoratorService.cs

@@ -3,7 +3,7 @@
 public class DecoratorService<T> :
     IDecoratorService<T>
 {
-    public T? Value { get; private set; }
+    public T? Service { get; private set; }
 
-    public void Set(T value) => Value = value;
+    public void Set(T value) => Service = value;
 }

Toolkit.Foundation/IDecoratorService.cs

@@ -2,7 +2,7 @@
 
 public interface IDecoratorService<T>
 {
-    T? Value { get; }
+    T? Service { get; }
 
-    void Set(T value);
+    void Set(T service);
 }

Toolkit.Foundation/Query.cs

@@ -0,0 +1,10 @@
+namespace Toolkit.Foundation;
+
+public class Query
+{
+    public static QueryEventArgs<TValue> As<TValue>(TValue value) =>
+        new(value);
+
+    public static QueryEventArgs<TValue> As<TValue>() where TValue : new() =>
+        new(new TValue());
+}

Toolkit.Foundation/QueryEventArgs.cs

@@ -0,0 +1,3 @@
+namespace Toolkit.Foundation;
+
+public record QueryEventArgs<TValue>(TValue Value);