我如何从form.cs文件调用变量到program.cs文件 [英] how to i call a variable from the form.cs file to the program.cs file

问题描述

我在访问两个变量时遇到麻烦.我浏览了互联网，发现需要使用类似form.dlg.selectedpath的名称来调用它，但是出现了三个错误.一个说form.dlg无法访问，另一个说需要对象引用.我还尝试访问另一个，它说表单不包含dlg2的定义.

I am having trouble accessing two of my variables. I have looked on the internet and found that I need to use something like form.dlg.selectedpath to call it but I get three errors. One says form.dlg is inaccessible the next says an object reference is required. I also try to access another one and that says form does not contain definition for dlg2.

这是我想要插入变量的代码.

This is the code I want the variables in.

var di = new DirectoryInfo(Form1.dlg.SelectedPath);  
           di.CopyTo(Form1.dlg2.SelectedPath, true);

这是我的代码，我从

 public partial class Form1 : Form    
    {  
        FolderBrowserDialog dlg = new FolderBrowserDialog();


        public Form1()
        {
            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)
        {

            if (dlg.ShowDialog() == DialogResult.OK)

第二个变量从这里引用.

And the second variable is referenced from here.

private void button1_Click(object sender, EventArgs e)  
        {  
            FolderBrowserDialog dlg2 = new FolderBrowserDialog();  
            if (dlg2.ShowDialog() == DialogResult.OK)  
            //do whatever with dlg.SelectedPath  
            {  
                backgroundWorker1.RunWorkerAsync(dlg2.SelectedPath);  
            }  
        }  

任何帮助将不胜感激.

推荐答案

字段不应该直接暴露出来；而是在表单上添加一个属性:

Fields should not really be directy exposed; instead add a property on the form:

public string FolderPath {
    get { return dlg.SelectedPath; }
}

然后从您的表单实例进行访问:

Then access from your form instance:

string path = myFormInstance.FolderPath;

也-确保将dlg与表格一起放置；实际上，个人我不会将其保留为一个字段-我会在一个小块中分配一个强大的字段，该小块创建，使用和配置对话框:

Also - make sure that dlg is disposed with the form; in pact personally I wouldnt keep it as a field at all - I'd have a strong field that I assign in a small block that creates, uses and disposes the dialog:

public string FolderPath { get; private set; }

private void SelectPath() {
    using(var dlg = new FolderBrowserDialog()) { // or whatever type
        if(dlg.ShowDialog() == DialogResult.OK) {
            FolderPath = dlg.SelectedPath;
        }
    }
}

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