添加项目文件。

SamplePre.Models/Models/ComboBoxListItem.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SamplePre.Models
+{
+    public class ComboBoxListItem : Object
+    {
+        public string Text { get; set; }
+
+        public object Value { get; set; }
+
+        public ComboBoxListItem(string text, object value)
+        {
+            this.Text = text;
+            this.Value = value;
+        }
+
+        public override string ToString()
+        {
+            return this.Text;
+        }
+    }
+}