Reflection.Emit添加的属性不可见 [英] Reflection.Emit added properties not visible
问题描述
在SQL中执行Pivot后，我得到一个数据源，其中包含一些已知列和可变数量的未知（在设计时）列。
I使用了经典的DataSet - DataTable解决方案，但在处理数据（60,000行和95列）时开始遇到OutOfMemory异常。
然后我意识到我需要一个更轻量级的解决方案所以使用Reflection.Emit在运行时构造我的类型。这完美地给了我比DataTables高10倍的性能，但是，处理代码非常复杂，所以为了简单起见，我改变了代码以生成一个类型，该类型继承自定义的基类型，其中基类型包含已知列和我使用Reflection.Emit来定义一个扩展基类的新类型，并在运行时添加额外的列。
这很好地简化了代码，我可以构建并完全构建正确填充这些对象。
问题是当我将它们绑定到DataGrid时，只有基本类型的列可见。如果我在调试器中添加对象的引用，我也只能看到基类的属性（Grid.DataSource（0）），但是如果我检查类型，我可以看到所有的属性都存在 - Grid.DataSource（ 0）.GetType.GetProperties（）。
任何人都知道为什么DataGrid和其他数据可视化器拒绝找到这些添加的属性？
After performing a Pivot in SQL I end up with a datasource with a few known columns and a variable amount of unknown (at design time) columns.
I used the classic DataSet - DataTable solution, but started hitting OutOfMemory exceptions while processing the data (60,000 rows and 95 columns).
I then realized I needed a lighter weight solution and so used Reflection.Emit to construct my types at runtime. This worked perfectly giving me a 10x performance increase over the DataTables, however, the processing code was quite complex, so for simplicity sake I changed the code to generate a type that inherits from a defined base type where the base type contains the known columns and I used Reflection.Emit to define a new type extending the base class and adding the extra columns at run time.
This simplified the code nicely and I can construct and fully populate these objects correctly.
The problem is that when I bind them to a DataGrid, only the base type's columns are visible. If I add a reference to the object in the debugger I can also only see the properties of the base class (Grid.DataSource(0)), however if I check the type I can see all the properties are there - Grid.DataSource(0).GetType.GetProperties().
Anyone know why the DataGrid and other data visualizers refuse to find these added properties?
推荐答案
你必须给approrpate标志发射字段 - 例如 http://msdn.microsoft.com/en- us / library / system.reflection.fieldattributes％28v = vs.110％29.aspx [ ^ ]。
You have to give the approrpate flags to emit fields - e.g. http://msdn.microsoft.com/en-us/library/system.reflection.fieldattributes%28v=vs.110%29.aspx[^].
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