Models/TestLiquid.cs

@@ -1,6 +1,6 @@
 namespace MembranePoreTester.Models
 {
-    public class TestLiquid
+    public class TestLiquid : IEquatable<TestLiquid>
     {
         public string Name { get; set; }
         public double SurfaceTension { get; set; } // mN/m, 25°C
@@ -10,7 +10,7 @@
         public double C_cmHg => 2.15 * SurfaceTension;
         public double C_psi => 0.415 * SurfaceTension;
 
-        public static List<TestLiquid> Predefined => new()
+        private static readonly List<TestLiquid> _predefined = new()
         {
             new TestLiquid { Name = "水", SurfaceTension = 72.0 },
             new TestLiquid { Name = "石油馏分", SurfaceTension = 30.0 },
@@ -18,5 +18,21 @@
             new TestLiquid { Name = "液态石蜡", SurfaceTension = 34.7 },
             new TestLiquid { Name = "BSD16", SurfaceTension = 16.0 }  // 新增
         };
+
+        // 返回可修改的全局液体列表（允许在运行时添加自定义液体便于恢复选择）
+        public static List<TestLiquid> Predefined => _predefined;
+
+        public override string ToString() => Name;
+
+        public bool Equals(TestLiquid other)
+        {
+            if (other is null) return false;
+            // 以 Name 为主键判断相等，SurfaceTension 可作为辅助信息
+            return string.Equals(Name, other.Name, StringComparison.Ordinal);
+        }
+
+        public override bool Equals(object obj) => Equals(obj as TestLiquid);
+
+        public override int GetHashCode() => Name?.GetHashCode() ?? 0;
     }
 }