Azure表存储，WCF服务和枚举 [英] Azure Table Storage, WCF Service and Enum

问题描述

这是我的问题。定义一个订单的类有一个名为 PaymentStatus 的属性，这是一个定义如下的枚举：

  public enum PaymentStatuses：int 
 {
 OnDelivery = 1，
付费= 2，
已处理= 3，
清除= 4 
} 
  

该类本身，属性定义非常简单：

  public PaymentStatuses？ PaymentStatus {get;组; } 
  

但是，如果我尝试将订单保存到Azure Table Storage，我会收到以下异常：

  System.InvalidOperationException：Order + PaymentStatuses类型没有可设置的属性。 
  

此时我以为使用枚举 isn不可能，但是一个快速的Google搜索返回： http://social.msdn.microsoft.com/Forums/en-US/windowsazure/thread/7eb1a2ca-6c1b-4440-b40e-012db98ccb0a

此页面列出了两个答案，其中一个似乎忽略了这些问题，并建议在Azure Storage中使用枚举。

现在，我不需要在Azure Table Storage中存储枚举，所以我也可以存储相应的 int ，但是，我确实需要这个属性在WCF服务中公开。

我试过属性使用获取和设置从a $中返回枚举存储 integer ，并使用 WritingEntity从Azure中删除此属性事件在我的 DataContext ，但是在该实体的事件触发之前我收到该异常。

在这一点上，我很失落，我不知道在WCF中有这个属性可以做什么，作为一个枚举，但是Azure存储只是 int 。

解决方案

不支持枚举。即使它被定义为一个int，它实际上不是表存储支持的一个整体类型。 以下是支持的类型列表。枚举只是一个字符串表达式一个具有面向对象风格的整数。

您可以在表存储中存储int，然后使用Enum.Parse隐藏它。

Here's my problem. A class which defines an order has a property called PaymentStatus, which is an enum defined like so:

    public enum PaymentStatuses : int
    {
        OnDelivery = 1,
        Paid = 2,
        Processed = 3,
        Cleared = 4
    }

And later on, in the class itself, the property definition is very simple:

    public PaymentStatuses? PaymentStatus { get; set; }

However, if I try to save an order to the Azure Table Storage, I get the following exception:

System.InvalidOperationException: The type Order+PaymentStatuses' has no settable properties.

At this point I thought using enum isn't possible, but a quick Google search returned this: http://social.msdn.microsoft.com/Forums/en-US/windowsazure/thread/7eb1a2ca-6c1b-4440-b40e-012db98ccb0a

This page lists two answers, one of which seems to ignore the problems and suggests that using an enum in Azure Storage is fine.

Now, I don't NEED to store the enum in the Azure Table Storage as such, I could just as well store a corresponding int, however, I do need this property to be exposed in the WCF service.

I've tried making the property use get and set to return the enum from a stored integer, and remove this property from Azure by using the WritingEntity event on my DataContext, but I get that exception before the event for this entity is fired.

At this point, I'm at a loss, I don't know what else I can do to have this property in WCF as an enum, but have Azure store just the int.

解决方案

Enum is not supported. Even though it is defined like an int, it is really not a integral type supported by Table Storage. Here is the list of types supported. An enum is just a string expression of an integral number with an object-oriented flavor.

You can store int in table storage and then covert it using Enum.Parse.

这篇关于Azure表存储，WCF服务和枚举的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！