[release/8.0] [Blazor] Pass the member info directly

src/Components/Forms/src/FieldIdentifier.cs

@@ -4,6 +4,7 @@
 using System.Collections.Concurrent;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq.Expressions;
+using System.Reflection;
 using System.Runtime.CompilerServices;
 using Microsoft.AspNetCore.Components.HotReload;
 
@@ -15,7 +16,7 @@ namespace Microsoft.AspNetCore.Components.Forms;
 /// </summary>
 public readonly struct FieldIdentifier : IEquatable<FieldIdentifier>
 {
-    private static readonly ConcurrentDictionary<(Type ModelType, string FieldName), Func<object, object>> _fieldAccessors = new();
+    private static readonly ConcurrentDictionary<(Type ModelType, MemberInfo Member), Func<object, object>> _fieldAccessors = new();
 
     static FieldIdentifier()
     {
@@ -151,7 +152,7 @@ private static void ParseAccessor<T>(Expression<Func<T>> accessor, out object mo
 
     internal static object GetModelFromMemberAccess(
         MemberExpression member,
-        ConcurrentDictionary<(Type ModelType, string FieldName), Func<object, object>>? cache = null)
+        ConcurrentDictionary<(Type ModelType, MemberInfo Member), Func<object, object>>? cache = null)
     {
         cache ??= _fieldAccessors;
         Func<object, object>? accessor = null;
@@ -160,7 +161,7 @@ internal static object GetModelFromMemberAccess(
         {
             case ConstantExpression model:
                 value = model.Value ?? throw new ArgumentException("The provided expression must evaluate to a non-null value.");
-                accessor = cache.GetOrAdd((value.GetType(), member.Member.Name), CreateAccessor);
+                accessor = cache.GetOrAdd((value.GetType(), member.Member), CreateAccessor);
                 break;
             default:
                 break;
@@ -183,11 +184,12 @@ internal static object GetModelFromMemberAccess(
             "Trimming",
             "IL2026:Members annotated with 'RequiresUnreferencedCodeAttribute' require dynamic access otherwise can break functionality when trimming application code",
             Justification = "Application code does not get trimmed. We expect the members in the expression to not be trimmed.")]
-        static Func<object, object> CreateAccessor((Type model, string member) arg)
+        static Func<object, object> CreateAccessor((Type model, MemberInfo member) arg)
         {
             var parameter = Expression.Parameter(typeof(object), "value");
             Expression expression = Expression.Convert(parameter, arg.model);
-            expression = Expression.PropertyOrField(expression, arg.member);
+
+            expression = Expression.MakeMemberAccess(expression, arg.member);
             expression = Expression.Convert(expression, typeof(object));
             var lambda = Expression.Lambda<Func<object, object>>(expression, parameter);
 

src/Components/Forms/test/FieldIdentifierTest.cs

@@ -3,6 +3,7 @@
 
 using System.Collections.Concurrent;
 using System.Linq.Expressions;
+using System.Reflection;
 
 namespace Microsoft.AspNetCore.Components.Forms;
 
@@ -142,7 +143,7 @@ public void CanCreateFromExpression_Property()
     public void CanCreateFromExpression_PropertyUsesCache()
     {
         var models = new TestModel[] { new TestModel(), new TestModel() };
-        var cache = new ConcurrentDictionary<(Type ModelType, string FieldName), Func<object, object>>();
+        var cache = new ConcurrentDictionary<(Type ModelType, MemberInfo FieldName), Func<object, object>>();
         var result = new TestModel[2];
         for (var i = 0; i < models.Length; i++)
         {
@@ -221,6 +222,53 @@ public void CanCreateFromExpression_MemberOfObjectWithCast()
         Assert.Equal(nameof(TestModel.StringField), fieldIdentifier.FieldName);
     }
 
+    [Fact]
+    public void CanCreateFromExpression_DifferentCaseField()
+    {
+        var fieldIdentifier = FieldIdentifier.Create(() => model.Field);
+        Assert.Same(model, fieldIdentifier.Model);
+        Assert.Equal(nameof(model.Field), fieldIdentifier.FieldName);
+    }
+
+    private DifferentCaseFieldModel model = new() { Field = 1 };
+#pragma warning disable CA1823 // This is used in the test above
+    private DifferentCaseFieldModel Model = new() { field = 2 };
+#pragma warning restore CA1823 // Avoid unused private fields
+
+    [Fact]
+    public void CanCreateFromExpression_DifferentCaseProperty()
+    {
+        var fieldIdentifier = FieldIdentifier.Create(() => Model2.Property);
+        Assert.Same(Model2, fieldIdentifier.Model);
+        Assert.Equal(nameof(Model2.Property), fieldIdentifier.FieldName);
+    }
+
+    protected DifferentCasePropertyModel Model2 { get; } = new() { property = 1 };
+
+    protected DifferentCasePropertyModel model2 { get; } = new() { Property = 2 };
+
+    [Fact]
+    public void CanCreateFromExpression_DifferentCasePropertyAndField()
+    {
+        var fieldIdentifier = FieldIdentifier.Create(() => model3.Value);
+        Assert.Same(model3, fieldIdentifier.Model);
+        Assert.Equal(nameof(Model3.Value), fieldIdentifier.FieldName);
+    }
+
+    [Fact]
+    public void CanCreateFromExpression_NonAsciiCharacters()
+    {
+        var fieldIdentifier = FieldIdentifier.Create(() => @ÖvrigAnställning.Ort);
+        Assert.Same(@ÖvrigAnställning, fieldIdentifier.Model);
+        Assert.Equal(nameof(@ÖvrigAnställning.Ort), fieldIdentifier.FieldName);
+    }
+
+    public DifferentCasePropertyFieldModel Model3 { get; } = new() { value = 1 };
+
+    public DifferentCasePropertyFieldModel model3 = new() { Value = 2 };
+
+    public ÖvrigAnställningModel @ÖvrigAnställning { get; set; } = new();
+
     string StringPropertyOnThisClass { get; set; }
 
     class TestModel
@@ -253,4 +301,27 @@ public override int GetHashCode()
             return StringComparer.Ordinal.GetHashCode(Property);
         }
     }
+
+    public class ÖvrigAnställningModel
+    {
+        public int Ort { get; set; }
+    }
+
+    private class DifferentCaseFieldModel
+    {
+        public int Field;
+        public int field;
+    }
+
+    protected class DifferentCasePropertyModel
+    {
+        public int Property { get; set; }
+        public int property { get; set; }
+    }
+
+    public class DifferentCasePropertyFieldModel
+    {
+        public int Value { get; set; }
+        public int value;
+    }
 }