F＃＆COM api向下轉換問題

我有一些C＃COM Api例子可以工作，但在轉換爲F＃時失敗。F＃＆COM api向下轉換問題

的F＃代碼是：

let list = api.CreateXXX() :?> XXX

C＃的轉換是隱式的（對象定義變量如XXX，然後用api.CreateXxxModule（）無需進一步轉換初始化

private XXX list; 
[...] 
list = api.CreateXXX()

Additional information: Unable to cast COM object of type 'System.__ComObject' to interface type 'ThomsonReuters.Interop.RTX.AdxRtList'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{057B736E-03DF-11D4-99C8-00105AF7EDAD}' failed due to the following error: Cette interface n’est pas prise en charge (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

。

使用XXXClass代替XXX進行向下轉換也不起作用：

Additional information: Unable to cast COM object of type 'System.__ComObject' to class type 'XXXClass'. COM components that enter the CLR and do not support IProvideClassInfo or that do not have any interop assembly registered will be wrapped in the __ComObject type. Instances of this type cannot be cast to any other class; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface.

是否有人會使用F＃與COM Apis通常與C＃一起使用，並對這些類型轉換有一些提示？

非常感謝！

來源

2016-10-26 user1251614

https://docs.microsoft.com/en-us/dotnet/articles/fsharp/language-reference/functions/do-bindings –

@HansPassant這只是一個鏈接到'做'綁定... – s952163

它具體談到你必須使用的屬性來支持單線程的COM服務器。 –

添加STAThread屬性的主要功能曾在：

module Main = 

    [<STAThread>] 
    do 
    ...

來源

2016-10-26 10:06:44 user1251614

F＃＆COM api向下轉換問題

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