EF 4.3代码首次迁移 - 解压缩__MigrationHistory模型 [英] EF 4.3 Code First Migrations - Uncompress __MigrationHistory Model
问题描述
如何解压缩/读取存储在EF 4.3 Code First Migrations __MigrationHistory表中的压缩模型？
我在该评论，我可以使用zip / gzip解压缩，但我不知道我应该怎么做。
问题是我已经改变了ef模型类，但是当我调用add-migration时，会生成一个空的迁移。我认为这是因为我的模型类的更改已经分配给现有的迁移：（
可能是一个很好的起点 - 在你的情况下不行）
我认为你可能会发现这很有用 - 你'只是<强调需要在相反的方向工作，我想（我只是暗示这里可能是什么方向，你必须检查出来，测试自己）...
$ a bref =nofollow > http://brice-lambson.blogspot.com/2012/05/using-entity-framework-code-first-with.html它使用以下代码...
private byte [] GetModel（TContext context）
{
using （var memoryStream = new MemoryStream（））
{
using（var gzipStream = new GZipStream（
memoryStream，
CompressionMode.Compress））
使用（var xmlWriter = XmlWriter.Create（
gzipStream，
new XmlWriterSettings {Indent = true}））
{
EdmxWriter.WriteEdmx上下文，xmlWriter）;
}
return memoryStream.ToArray（）;
}
}
以序列化模型。
但是，据我所知（如果我理解正确）你需要在另一个方向...
快速搜索没有显示相当的阅读器 - 您可以下载最新的 EF6代码 - 或者也找到EF5一个（如果需要的话我会在后面链接）。
读者：
其实这可能更接近你想要的： / p>
http://edmxdom.codeplex.com/
（我没有尝试过但是从MS链接）
并检查有关使用 MetadataWorkspace
如果您需要有关 MetadataWorkspace 的更多信息，我将发布一些关于该主题的帖子。你可以得到最多的信息 - 你需要排序反向什么 EdmxWriter 正在做。
本质上，您正在寻找实体框架Edmx reader 。
EdmxDOM：
我刚刚检查出来 - 做你需要的Edmx格式管理。
这是一个'VB'项目 - 但是你可以通过这个工作来实现
有什么似乎是一个读者（再次，不确定，刚刚经历了这个，正如我所知道的作家，但从来没有在这个部分，方向）...
Public Sub LoadFile（ByVal fileName As String）
code> Edmx.vb
How can I uncompress/read the compressed models stored in the EF 4.3 Code First Migrations __MigrationHistory table?
I found a hint in this comment, that I can uncompress it using zip/gzip, but I don't know how exactly I should do this.
The problem is that I have changed something in my ef model classes, but when I call "add-migration" an empty migration ist generated. I think that is because the changes of my model classes are already assigned to an existing migration :(
(this may be a good starting point - won't work in your case)
I think you may find this useful - you 'just' need to work it out in the opposite direction, I think (I'm just hinting here as to what might be the direction, you'll have to check it out, test yourself)...
http://brice-lambson.blogspot.com/2012/05/using-entity-framework-code-first-with.html
It uses the following code...
private byte[] GetModel(TContext context)
{
using (var memoryStream = new MemoryStream())
{
using (var gzipStream = new GZipStream(
memoryStream,
CompressionMode.Compress))
using (var xmlWriter = XmlWriter.Create(
gzipStream,
new XmlWriterSettings { Indent = true }))
{
EdmxWriter.WriteEdmx(context, xmlWriter);
}
return memoryStream.ToArray();
}
}
to serialize the model.
However, as I understand (if I understand it properly) you need it in the other direction...
Quick search didn't show the equivalent reader - you can download the latest EF6 code - or also find EF5 one (I'll link in later if needed).
Reader:
Actually this may be closer to what you want:
http://edmxdom.codeplex.com/
(I haven't tried it out but was linked from MS)
And check the response about using MetadataWorkspace
If you need more info on the MetadataWorkspace I'll post some posts I made on that subject. You can get most info out - you'll need to sort 'reverse' what EdmxWriter is doing.
Essentially, you're looking for entity framework Edmx reader.
EdmxDOM:
I just checked it out fast - and it seems to be doing the Edmx format management you need.
It's a 'VB' project - but you can work through that
There is what seems to be a 'reader' (again, not sure, just went through this, as I know about the writer - but never worked w/ this part, direction)...
Public Sub LoadFile(ByVal fileName As String)
In the Edmx.vb
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