在亚音速3铸造问题 [英] Casting problem in SubSonic 3

问题描述

在保存行具有integere主键下面的异常被抛出在VB版本： 公共成员'ChangeTypeTo上键入小数没有找到。

When saving a row that has a integere primary key following exception is thrown in the VB version: 'Public member 'ChangeTypeTo' on type 'Decimal' not found.'

这发生在ActiveRecord.VB文件中的行3406：

This happens in ActiveRecord.VB file line 3406:

        Public Sub SetKeyValue(value As Object) Implements IActiveRecord.SetKeyValue
        If value IsNot Nothing AndAlso value IsNot DBNull.Value Then
            Dim settable = value.ChangeTypeTo(Of Integer)()

我可以改变的最后一行：

I can change the last line to:

Dim settable = CInt(value)  'value.ChangeTypeTo(Of Integer)()

这将解决这个问题，直到我重新编译.TT文件。

This will fix the problem until I recompile the .tt files.

我的问题是，我该怎么改变这个在ActiveRecord.tt文件？ 在code在TT文件看起来是这样的：

My question is, how can I change this in the ActiveRecord.tt file? The code in the tt file looks like this:

Dim settable = value.ChangeTypeTo(Of <#=tbl.PK.SysType#>)()

任何帮助是AP preciated。

Any help is appreciated.

感谢

推荐答案

我也有与VB模板的各种问题。这似乎的亚音速发展的重点是在C＃。最后，我选择使用C＃的模板在另一个项目，并从我的VB应用程序主引用它。与您正在试图做的改变的问题是，你想更换一个通用的方法，具体的，这并不是越大越好。 ＆LT;＃= tbl.PK.SysType＃＆GT; 提到了主键的类型。如果你只有整数主键，您可以编辑该模板的暗淡可设置= CINT（值）。否则，你需要的GetType的知道值的类型，然后一个选择的情况下每种类型的apropiate转换的到达的方法。

I also had have various issues with the VB templates. That seems the focus of the Subsonic developers is in C#. Finally I choose to use the C# templates in another project, and reference it from my VB main application. The problem with the change that you're trying to do is that you're trying to replace a generic method for a concrete one, this isn't the better. <#=tbl.PK.SysType#> makes reference to the type of the primary key. If you only have integer primary keys, you can edit the template as Dim settable = CInt(value). Otherwise you need GetType for know the type of value, and then a select case with the apropiate conversion for each type that arrives to the method.

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