1 var _list = new { Name = "111111", Value = "AAAAA" };
2 _list.Set();
3 var myAnonInstance = new
4 {
5 FirstField = "Hello",
6 AnotherField = 30,
7 a = new { a = 111 }
8 };
9 Console.WriteLine(myAnonInstance);
10 myAnonInstance.a.Set(o => o.a, 2222);
11 myAnonInstance
12 .Set(x => x.FirstField, "Hello SO")
13 .Set(x => x.AnotherField, 42);
14 Console.WriteLine(myAnonInstance);
15
16 public static class AnonymousObjectMutator
17 {
18 private const BindingFlags FieldFlags = BindingFlags.NonPublic | BindingFlags.Instance;
19 private static readonly string[] BackingFieldFormats = { "<{0}>i__Field", "<{0}>" };
20
21 public static T Set<T, TProperty>(this T instance, Expression<Func<T, TProperty>> propExpression, TProperty newValue) where T : class
22 {
23 var pi = (propExpression.Body as MemberExpression).Member;
24 var backingFieldNames = BackingFieldFormats.Select(x => string.Format(x, pi.Name)).ToList();
25 var fi = typeof(T)
26 .GetFields(FieldFlags)
27 .FirstOrDefault(f => backingFieldNames.Contains(f.Name));
28 if (fi == null)
29 {
30 GetDynamicClassBydt("", "bb");
31 //throw new NotSupportedException(string.Format("Cannot find backing field for {0}", pi.Name));
32 }
33 else
34 {
35 fi.SetValue(instance, newValue);
36 }
37 return instance;
38 }
39
40 /// <summary>
41 /// 使用dynamic根据DataTable的列名自动添加属性并赋值
42 /// </summary>
43 /// <param name="dt"></param>
44 /// <returns></returns>
45 public static Object GetDynamicClassBydt(string file, string vl)
46 {
47 dynamic d = new System.Dynamic.ExpandoObject();
48 //创建属性，并赋值。
49 (d as System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<string, object>>).Add(new System.Collections.Generic.KeyValuePair<string, object>(file, vl));
50
51 return d;
52 }
53 }
