Question

我有这行代码：

checkForUpdatesToolStripMenuItem.Enabled = true;

然而，它给了我错误：

名称'checkForUpdatesToolStripMenuItem'不存在于当前背景

问题是，如何从我正在使用的当前.CS文件中访问该项目（checkForUpdatesToolStripMenuItem），其中'checkForUpdatesToolStripMenuItem'是表单的一部分？

感谢。

Answer 1

您可以将值传递给其他类：

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Send_ToolStrip_Data_To_Instance_Class()
    {
        My_Other_CS_File other_File = new My_Other_CS_File();
        other_File.Act_On_ToolStrip_Item(checkForUpdatesToolStripMenuItem.Enabled);
    }
}
public class My_Other_CS_File
{
    public void Act_On_ToolStrip_Item(bool enabled)
    {
        //do something
    }
}

Answer 2

namespace SO_Question_win

{ //就C＃而言，在同一名称空间下的EVERYTHIG也可能出现在销售文件中。我们使用不同的文件以方便。公共部分类Form1：表格 { //这是项目中主窗体的表单类。它是程序启动时线程所在的位置。在创建

之前，不会存在其他实例类

    public Form1()
    {
        InitializeComponent();
    }

    private void hello()
    {
        //I can only call hello from inside this class.
        My_Other_CS_File other_File = new My_Other_CS_File();
        //you created this instance class here. It will only exist until "hello" finishes running, then it will disappear.
        string hello = "hi";
        //the only way to get the string hello to the class you created is to pass it.
        other_File.SayHello(hello);
        //other_file is done. It will disappear now if you want it again you will have to create a new instance
    }
}
public class My_Other_CS_File
{
    public void SayHello(string hi)
    {
        //here, the string Hi is passed from the form class 
        Console.WriteLine(hi);
        //even though this class was created by the form class, it has access to any public static classes. 
        Console.WriteLine(Global.helloString);
    }
}
public static class Global
{
    //anything marked "public static" here will be visible to any class under the same namespace. This class is niether created nor destroyed - it always exists. hat's the difference bewtween static and instance.
    public static string helloString = "howdy";
}

}

C＃ - 从另一个.CS文件访问ToolStripMenuItem控件

2 个答案: