不能自ICollection轉換爲ICollection的C/CLI

Question

我需要填寫一個集合在C另一個列表++/CLI所以這個問題，當我嘗試這樣做，我得到一個錯誤

錯誤C2664：「是SpaceClaim :: Api :: V10 :: InteractionContext :: Selection :: set'：無法將參數1從'System :: Collections :: Generic :: ICollection ^'轉換爲'System :: Collections :: Generic :: ICollection ^'

和這裏的代碼

List<DesignEdge^> ^newEdges = gcnew List<DesignEdge^>(); 
for each (DesignEdge^edge in onecopiedBody->Edges) 
{ 

if (!edges->Contains(edge)) 
{ 
    newEdges->Add(edge); 
} 
} 
cstom->InteractionContext->Selection = safe_cast<ICollection<IDesignEdge^> ^>(newEdges); //error here 

Answer 1

的問題是，你想投的ICollection<DesignEdge^>^到ICollection<IDesignEdge^>^，這是不安全的。你應該做的是從IDesignEdge開始運作：

auto newEdges = gcnew List<IDesignEdge^>();