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我尝试通过添加几个函数来扩展列表框。我收到一个错误（错误 C2144：语法错误：'Extended_ListBox' 应该以 ':' 开头）。有人能教我如何解决吗？我去了 VC++ 说有错误的那一行，但我不知道为什么构造函数有错误。

    using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
using namespace System::Collections;
using namespace System::Collections::Generic;

#include <stdio.h>
#include <stdlib.h>
#using <mscorlib.dll>


public ref class Extended_ListBox: public ListBox{  

    public Extended_ListBox(array<String ^> ^ textLineArray, int counter){
        textLineArray_store = gcnew array<String ^>(counter);
        for (int i=0; i<counter; i++){
            this->Items->Add(textLineArray[i]);
            textLineArray_store[i] = textLineArray[i];
        }
        this->FormattingEnabled = true;
        this->Size = System::Drawing::Size(380, 225);
        this->TabIndex = 0;
        this->SelectedIndexChanged += gcnew System::EventHandler(this, &Extended_ListBox::listBox1_SelectedIndexChanged);
    }
    public Extended_ListBox(){
        this->FormattingEnabled = true;
        this->Size = System::Drawing::Size(380, 225);
        this->TabIndex = 0;
        this->SelectedIndexChanged += gcnew System::EventHandler(this, &Extended_ListBox::listBox1_SelectedIndexChanged);
    }
    private: System::Void listBox1_SelectedIndexChanged(System::Object^  sender, System::EventArgs^  e) {
                 int index=this->SelectedIndex;
                 tempstring = textLineArray_store[index];
         }  

private: array<String ^> ^ textLineArray_store;
private: String ^tempstring;
public: String ^GetSelectedString(){
            return tempstring;
        }
public: void ListBox_Update(array <String ^> ^ textLineArray, int counter){
        textLineArray_store = gcnew array<String ^>(counter);
        for (int i=0; i<counter; i++){
            this->Items->Add(textLineArray[i]);
            textLineArray_store[i] = textLineArray[i];
        }
        }
};
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1 回答 1

1

在 C++/CLI 中，您指定访问修饰符（公共、私有等）的方式与在 C# 或 Java 中不同。

相反，您只需写一行（注意冒号，这是必需的）：

public:

以下所有成员都是公开的。因此，在构造函数之前插入该行，并在构造函数之前删除public关键字。像那样：

public ref class Extended_ListBox: public ListBox{  
public:
    Extended_ListBox(array<String ^> ^ textLineArray, int counter){
        // constructor code
    }

    Extended_ListBox(){
        // default constructor code
    }

    // other public members 
    // ...

private:
    // private members
    // ...
}

Similar to the members below the constructors in your current example, except that you don't have to explicitly restate public: or private: if the next member has the same visibility.

于 2012-04-23T11:46:26.740 回答