C# Nullable 类型转换报错问题

C# Nullable 类型转换报错问题

 var t = p.PropertyType;var obj = new object();var value = row[p.Name].ToString();// 解决 nullable long ？转换错误if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>)){if (string.IsNullOrEmpty(value))obj = null;elseobj=Convert.ChangeType(value, Nullable.GetUnderlyingType(t));//obj = Convert.ChangeType(value, t.GetGenericArguments()[0]);dynmicValue = System.ComponentModel.TypeDescriptor.GetConverter(prop.PropertyType).ConvertFromString(value.ToString());}else{obj = Convert.ChangeType(value, p.PropertyType);//类型强转，将table字段类型转为集合字段类型  }