我已经为 processdialogkey() 创建了一个 Datagridview 类。但是我遇到了以下错误......任何人都可以帮助我......
这段代码:
//Header File MyDGV.h
public ref class MyDGV : public DataGridView
{
protected:
virtual bool ProcessDialogKey(System::Windows::Forms::Keys^ keyData) override;
};
//MyDGV.CPP File
#include "StdAfx.h"
#include "MyDGV.h"
bool MyDGV::ProcessDialogKey(System::Windows::Forms::Keys^ keyData)
{
Keys^ key = keyData & (System::Windows::Forms::Keys::KeyCode);
if (key == System::Windows::Forms::Keys::Enter)
{
DataGridView::OnKeyDown(gcnew KeyEventArgs(System::Windows::Forms::Keys^ keyData));
return true;
}
else
{
return DataGridView::ProcessDialogKey(System::Windows::Forms::Keys^ keyData);
}
}
导致以下错误:
Errors:
01. warning C4490: 'override' : incorrect use of override specifier; 'MyDGV::ProcessDialogKey' does not match a base ref class method
02.error C3063: operator '&': all operands must have the same enumeration type
03.error C2275: 'System::Windows::Forms::Keys' : illegal use of this type as an expression
04.error C2275: 'System::Windows::Forms::Keys' : illegal use of this type as an expression
最佳答案
System::Windows::Forms::Keys 是一个枚举，因此是一个值类型(不是引用类型)。因此，要匹配要删除帽子 (^) 的基类方法的签名。一般来说，除非您确实需要装箱行为，否则不应将帽子与值类型一起使用。
http://msdn.microsoft.com/en-us/library/system.windows.forms.keys.aspx
关于c++ - DataGridView 类 - 错误()，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10120383/