1

我为 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
4

1 回答 1

1

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，您不应该将帽子与值类型一起使用，除非您确实需要拳击行为。

http://msdn.microsoft.com/en-us/library/system.windows.forms.keys.aspx

于 2012-04-12T12:03:57.060 回答