TemplateForm custom EditContext null on submit

Fix #2537

Radzen.Blazor.Tests/TemplateFormTests.cs

@@ -0,0 +1,35 @@
+using System.ComponentModel.DataAnnotations;
+using Bunit;
+using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Components.Forms;
+using Xunit;
+
+namespace Radzen.Blazor.Tests
+{
+    public class TemplateFormTests
+    {
+        class ContactInfo
+        {
+            [Required]
+            public string Name { get; set; }
+        }
+
+        [Fact]
+        public void Submit_Passes_EditContext_Model_When_Data_Not_Set()
+        {
+            using var ctx = new TestContext();
+            var model = new ContactInfo { Name = "Alice" };
+            var editContext = new EditContext(model);
+
+            ContactInfo submitted = null;
+
+            var form = ctx.RenderComponent<RadzenTemplateForm<ContactInfo>>(parameters => parameters
+                .Add(p => p.EditContext, editContext)
+                .Add(p => p.Submit, EventCallback.Factory.Create<ContactInfo>(this, value => submitted = value)));
+
+            form.Find("form").Submit();
+
+            Assert.Same(model, submitted);
+        }
+    }
+}

Radzen.Blazor/RadzenTemplateForm.cs

@@ -181,7 +181,7 @@ namespace Radzen.Blazor
 
                 if (valid)
                 {
-                    await Submit.InvokeAsync(Data);
+                    await Submit.InvokeAsync(Data ?? (EditContext.Model is TItem model ? model : default));
 
                     if (Action != null && JSRuntime != null)
                     {