[英]I have a context problem with c#
我在c#中創建的2個Windows窗體有問題。 第一個窗體(菜單)具有一個PrintPreviewDialog對象。 然后,“菜單”窗體實例化發送類“文件”的副本,並調用ShopDialog方法。
“文件”類寫入文件,並在“菜單”類中調用方法(直接)。
我的問題是“菜單”類不了解“直接”方法。 我認為答案是在“文件”中定義“菜單”類的副本,但我看不出必須這樣做。
感謝您的任何幫助。
約翰
namespace CSharp
{
public partial class MainMenu : Form
{
// Fields for printing.
public PrintDocument printDocument1 = new PrintDocument();
PageSettings printPageSettings = new PageSettings();
static RichTextBox printRichTextBox = new RichTextBox();
static string stringToPrint = "";
Font printFont = new Font("Arial", 10);
/****************************************************
* Select the Data->File-IO menu item. *
****************************************************/
private void fileIoToolStripMenuItem1_Click(object sender, EventArgs e)
{
File_IO fileIoDialog = new File_IO();
fileIoDialog.ShowDialog();
}
/****************************************************
* Initiate the printing process. The data to be *
* printed will be read from a file and stored in a*
* rich text box. The print menu buttons are *
* enabled. *
****************************************************/
public static void PrintInitialise(String printSource)
{
try
{
// Read text file and load into printRichTextBox.
FileStream printStream = new FileStream(printSource, FileMode.Open, FileAccess.Read);
printRichTextBox.LoadFile(printSource, RichTextBoxStreamType.PlainText);
printStream.Close();
// Initialise string to print.
stringToPrint = printRichTextBox.Text;
}
catch (Exception ex)
{
// Display error message if they appear.
MessageBox.Show(ex.Message);
}
}
/****************************************************
* Select the Data->File-IO menu item. *
****************************************************/
public void PrintDirect()
{
printDocument1.Print();
}
/****************************************************
* Select the Data->File-IO menu item. *
****************************************************/
private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
int numChars;
int numLines;
string stringForPage;
StringFormat strFormat = new StringFormat();
// Based on page setup, define drawable rectangle on page
}
}
}
namespace `enter code here`CSharp
{
public partial class File_IO : Form
{
MainMenu mainBransom;
public File_IO()
{
InitializeComponent();
}
private void btnPrint_Click(object sender, EventArgs e)
{
MainMenu.PrintInitialise(printSource);
mainBransom.PrintDirect();
}
您可以使用屬性將對menu
類的引用存儲在send
類中。
public class send: Form
{
public send(Form menuForm)
{
menu = menuForm;
}
public Form menu { get; private set; }
//... some other methods and properties
public void SomeButton_Click(object sender, EventArgs e)
{
// you have access to the direct method (provided it is public)
menu.direct();
}
}
為了實例化send
類,您需要傳遞對menu
形式的引用。
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