如何清除SaveFileDialog的内容？

本文介绍了如何清除SaveFileDialog的内容？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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： 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