C# 反射动态判断转换属性类型值生成类实例

/// <summary>

     /// 为指定对象分配参数

     /// </summary>

     /// <typeparam name="T">待赋值的类型</typeparam>

     /// <param name="dic">字段/值</param>

     /// <returns></returns>

     private T Assign<T>(Dictionary<string, string> dic) where T : new()

     {

       Type t = typeof (T);

       T entity = new T();

       var fields = t.GetProperties();

       

       string val = string.Empty;

       object obj = null;

       foreach (var field in fields)

       {

         if (!dic.Keys.Contains(field.Name))

           continue;

         val = dic[field.Name];

         //非泛型

         if (!field.PropertyType.IsGenericType)

           obj = string.IsNullOrEmpty(val) ? null : Convert.ChangeType(val, field.PropertyType);

         else //泛型Nullable<>

         {

           Type genericTypeDefinition = field.PropertyType.GetGenericTypeDefinition();

           if (genericTypeDefinition == typeof (Nullable<>))

           {

             obj = string.IsNullOrEmpty(val)

               ? null

               : Convert.ChangeType(val, Nullable.GetUnderlyingType(field.PropertyType));

           }

         }

         field.SetValue(entity, obj, null);

       }



       return entity;

     }