如何清除SaveFileDialog的内容？ [英] How to clear the content of SaveFileDialog?

问题描述

嗨。

我正在开发一个Windows窗体应用程序，其中一个部分需要制作并将pdf文件保存到我PC上的所需位置。我想在同一个应用程序中制作2个不同的文件（不关闭应用程序并再次运行）



例如，我把文本框中的文本，该文件应该包含该文本，并在单击按钮SaveFileDialog应该打开后，我将此文件保存到我的PC（这部分正在做精细）。然后我从文本框中删除文本，然后在其中添加新文本。如果我再次按下按钮并选择正确的位置，它将保存与以前相同的文件（具有与之前相同的内容）。我怎么处理这个问题呢？



编辑：



< pre lang =c＃> SaveFileDialog pdfFile = new SaveFileDialog（）;
pdfFile.Filter = PDF | * .pdf;
pdfFile.Title = aaPDF;
pdfFile.FileName = aaa;
BaseFont bf = BaseFont.CreateFont（BaseFont.HELVETICA，BaseFont.CP1250， false ）;
pdfFont titleFont = new pdfFont（bf， 20 ）;
pdfFont infoFont = new pdfFont（bf， 12 ）;
pdfFont questionsFont = new pdfFont（bf， 14 ）;
Chunk glue = new 块（ new VerticalPositionMark（））;

if （pdfFile.ShowDialog（）== System.Windows.Forms.DialogResult.OK）
{
文档文档= 新文档（iTextSharp.text.PageSize.A4， 40 ， 40 ， 50 ， 50 ）;
PdfWriter writer = PdfWriter.GetInstance（document， new FileStream（pdfFile.FileName，FileMode.Create））;
document.Open（）;

document.NewPage（）;
ParagraphPDF title = new ParagraphPDF（ AAA ，titleFont）;
title.Alignment = Element.ALIGN_CENTER;
document.Add（title）;
document.Add（Chunk.NEWLINE）;

ParagraphPDF p1 = new ParagraphPDF（textFromTextbox，infoFont）;
document.Add（p1）;

document.Close（）;
}

解决方案

在代码中放置断点：当您点击断点时单步执行代码并检查变量的值。在Visual Studio中使用F11单步执行。



您要么覆盖文件，要么没有访问TextBox中更改的内容。这应该很容易理解。

  if （pdfFile.ShowDialog（）== System.Windows.Forms.DialogResult.OK）
 {
   //  在这里设置一个断点：单步前进  
凭证凭证= 新凭证（iTextSharp.text.PageSize.A4， 40 ， 40 ， 50 ， 50 ）; 
 PdfWriter writer = PdfWriter.GetInstance（document， new  FileStream（pdfFile.FileName，FileMode.Create））; 
 document.Open（）; 
 
 document.NewPage（）; 
 ParagraphPDF title =  new  ParagraphPDF（  AAA ，titleFont）; 
 title.Alignment = Element.ALIGN_CENTER; 
 document.Add（title）; 
 document.Add（Chunk.NEWLINE）; 
 
 ParagraphPDF p1 =  new  ParagraphPDF（textFromTextbox，infoFont）; 
   //  在这里设置一个断点：单步前进  
 document.Add（p1）; 
   //  在这里设置一个断点：单步前进  
 document.Close（）; 
} 

此外，在此代码返回后放置一个断点。

您可以修改 SaveFileDialog的属性。 FileName 。

-SA

Hi.
I'm working on a windows forms app which, in one of its parts needs to make and save pdf file to desired location on my PC. I want to make 2 different files in the same app (NOT closing the app and running it again)

For example, I put the text in the textbox, the file should contain that text and after clicking the button SaveFileDialog should open and I will save this file to my PC (THIS PART IS DOING FINE). Then I erase the text from textbox and I add new text in it. If I press the button again and choose the proper location, It will save the same file as before (with the same content as before). How can I deal with this problem?

EDIT:

SaveFileDialog pdfFile = new SaveFileDialog();
pdfFile.Filter = "PDF|*.pdf";
pdfFile.Title = "aaPDF";
pdfFile.FileName = "aaa";
BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1250, false);
pdfFont titleFont = new pdfFont(bf, 20);
pdfFont infoFont = new pdfFont(bf, 12);
pdfFont questionsFont = new pdfFont(bf, 14);
Chunk glue = new Chunk(new VerticalPositionMark());

if (pdfFile.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
       Document document = new Document(iTextSharp.text.PageSize.A4, 40, 40, 50, 50);
       PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(pdfFile.FileName, FileMode.Create));
       document.Open();

       document.NewPage();
       ParagraphPDF title = new ParagraphPDF("AAA", titleFont);
       title.Alignment = Element.ALIGN_CENTER;
       document.Add(title);
       document.Add(Chunk.NEWLINE);

       ParagraphPDF p1 = new ParagraphPDF(textFromTextbox, infoFont);                   
       document.Add(p1);              

       document.Close();
}

解决方案

Put break-points in your code: when you hit the break-points single-step through your code and examine the values of the variables. Use F11 to single-step in Visual Studio.

Either you are over-writing the file, or you are not accessing the changed content in the TextBox. This should be simple to figure out.

if (pdfFile.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
// put a break-point here: single-step forward
       Document document = new Document(iTextSharp.text.PageSize.A4, 40, 40, 50, 50);
       PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(pdfFile.FileName, FileMode.Create));
       document.Open();
 
       document.NewPage();
       ParagraphPDF title = new ParagraphPDF("AAA", titleFont);
       title.Alignment = Element.ALIGN_CENTER;
       document.Add(title);
       document.Add(Chunk.NEWLINE);
 
       ParagraphPDF p1 = new ParagraphPDF(textFromTextbox, infoFont);
// put a break-point here: single-step forward                   
       document.Add(p1);              
// put a break-point here: single-step forward 
       document.Close();
}

Also, put a break-point just after this code returns.

You can modify the property of SaveFileDialog.FileName.

—SA

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